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Of late, electric vehicles (EVs) have attracted much attention owing to their use of clean energy. Large progress in lithium-ion battery has propelled the development of EVs.However, the challenge is that growing number of EVs leads to huge demand in electric power, which will aggravate the power grid load. This leads to an exploration for alternative and clean sources of energy to charge EVs. This project implements solar energy system to erect a charging station for EV application. The charging station employs multi-port charging by providing a constant voltage DC bus. The charging controllers are operated based on the concept of power balance, and constant current/constant voltage charging. Performance of the charging system is validated with simulation and experimental results.
Generation of Higher Number of Voltage Levels by Stacking Inverters of Lower ...Asoka Technologies
This paper proposes a new method of generating higher number of levels in the voltage waveform by stacking multilevel converters with lower voltage space vector structures. An important feature of this stacked structure is the use of low voltage devices while attaining higher number of levels. This will find extensive applications in electric vehicles since direct battery drive is possible. The voltages of all the capacitors in the structure can be controlled within a switching cycle using the switching state redundancies (pole voltage redundancies). This helps in reducing the capacitor size. Also, the capacitor voltages can be balanced irrespective of modulation index and load power factor. To verify the concept experimentally, a 9-level inverter is developed by stacking two 5-level inverters and an induction motor is run using V/f control scheme. Both steady state and transient results are presented.
Novel symmetric modular hybrid multilevel inverter with reduced number of sem...Asoka Technologies
In this paper, by using a modular hybrid structure, a new topology for symmetric multilevel inverters (MLI) with a small number of semiconductors and low voltage stress across switches is proposed. Despite many other topologies, this topology can inherently produce negative levels and zero levels without using the H-bridge. The voltage stress across a particular switch of the proposed MLI is inversely proportional to the number of the switching of that switch in a voltage period. The proposed structure is based on two types of module, that is, the f-module and the e-module. The e-module uses a capacitive voltage divider to double the number of non-zero levels. The voltages of the capacitors are approximately balanced without complex control methods. The basic structure of the proposed topology is formed by connecting the f-module and the e-module in series with each other, and the cascaded topology is developed by cascading multiple f-modules with an e-module. To investigate the proposed topology and proving its practicability, simulation results with MATLAB/Simulink, investigation of the capacitor voltages, loss calculations and experimental results are presented. A comparative study is also performed to show the merit of the new multilevel inverter over other topologies.
A Variable DC Link based Novel Multilevel Inverter Topology for Low Voltage A...Asoka Technologies
In this paper; a variable dc link based novel multilevel inverter (MLI) topology is proposed. This proposed topology comprises two variable dc links and a modified H-bridge unit. This new single-phase topology offers advantages such as reduction in count of switches; gate drivers and dc sources while simultaneously improving the power quality. The proposed topology has been analyzed for both symmetric and asymmetric modes of operation. A comparative study of the proposed topology with some recent MLI topologies has been presented. The comparative study indicates that the proposed topology requires less number of dc sources; switches and driver circuits as compared to other topologies. The proposed topology has been simulated for 31- level asymmetric configuration in MATLAB/SIMULINK environment to verify the proper operation of proposed topology. Harmonic analysis was also performed for 31-level inverter which showed significant reduction in the total harmonic distortion (THD) for phase voltage and current waveforms. The proposed topology is suitable for low voltage applications such as standalone photovoltaic (PV) systems and hybrid electric vehicles (HEVs).
A Simplified Space Vector Pulse-Width Modulation Scheme for Three-Phase Casca...Asoka Technologies
A simplified space vector pulse-width modulation (SVPWM) for three-phase cascaded H-bridge (CHB) inverters is presented in this paper. Treating each unit as a three-level inverter and adopting serial calculation mode, a CHB inverter is modulated unit by unit using three-level SVPWM. Duty cycles of real sector are obtained by mapping duty cycles of sector 1, in which the calculation of three-level SVPWM is done. The process to implement multilevel SVPWM is simplified to the process to implement three-level SVPWM. By reusing FPGA chip resource which is used for the calculation of three-level SVPWM, the presented SVPWM can be easily adopted to a CHB inverter with different number of units, while the FPGA chip resource utilization is reduced significantly. In addition, the presented SVPWM provides an effective switching frequency higher than the switching frequency of IGBTs. Simulation and experimental results are provided to verify the feasibility of the presented SVPWM.
A New Family of Step-up Hybrid Switched- Capacitor Integrated Multilevel Inve...Asoka Technologies
In the low voltage based renewable systems like PV and Fuel cell applications, the step-up of the output voltage to drive the loads is essential. For this, the integration of switched-capacitor (SC) units with the dc-ac converters will have the potential advantages like improved efficiency, optimal switching devices, small size of passive elements (L and C) as compared with traditional two-stage conversion system (dc/dc converter and dc/ac converter). This paper focuses on a new family of step-up multilevel inverter topologies with switched capacitor integration with dual input voltage sources. With the flexibility of 2 dc sources and switching capacitor circuits, four different topologies have been suggested in this paper with features of high voltage gain, reduced component count, reduced voltage stress and self-voltage balancing of the capacitor while achieving a higher number of levels. A detailed analysis of proposed multilevel inverters has been analyzed with the symmetrical and asymmetrical mode of operations and the associated gain, the number of levels, and other performance indices are presented. An in-depth study of all the topologies has been accomplished in this paper with several comparative studies in terms of components count, voltage gain and cost. The effectiveness and practicability of the suggested topology with 13 level output voltage has been explained by the experimental results obtained from a scale down prototype.
A multi cell 21-level hybrid multilevel inverter synthesizes a reduced number...Asoka Technologies
A multi-cell hybrid 21-Level multilevel inverter is proposed in this paper. The proposed topology includes two-unit; an H-bridge is cascaded with a modified K-type unit to generate an output voltage waveform with 21 levels based only on two unequal DC suppliers. The proposed topology's advantage lies in the fine and clear output voltage waveforms with high output efficiency. Meanwhile, the high number of output voltage waveform levels generates a low level of distortion and reduces the level of an electromagnetic interface (EMI). Moreover, it reduces the voltage stress on the switching devices and gives it a long lifetime. Also, the reduction in the number of components has a noticeable role in saving size and cost. Regarding the capacitors charging, the proposed topology presents an online method for charging and balancing the capacitor's voltage without any auxiliary circuits. The proposed topology can upgrade to a high number of output steps through the cascading connection. Undoubtedly this cascading will increase the power level to medium and high levels and reduce the harmonics content to a neglectable rate. The proposed system has been tested through the simulation results, and an experimental prototype based on the controller dSPACE (DS-1103) hardware unit used to support the simulation results.
A generalized multilevel inverter topology with reduction of total standing v...Asoka Technologies
This paper presents a new multilevel inverter topology with reduced active switches and total standing voltage. The proposed topology can generate a high number of voltage levels in the symmetric configuration. This topology intuitively generates positive and negative cycles without an additional H-bridge unit, which considerably reduces the total standing voltage of the inverter. A cascaded structure is developed from the proposed topology to create higher voltage levels. To show the novelty of the proposed topology, a thorough comparison between the available and the proposed topologies in terms of the number of switches, standing voltages, and dc-sources is presented. Furthermore, the power loss analysis is carried out for various load values. The feasibility of the proposed nine-level inverter is verified with simulation and experimental results.
Of late, electric vehicles (EVs) have attracted much attention owing to their use of clean energy. Large progress in lithium-ion battery has propelled the development of EVs.However, the challenge is that growing number of EVs leads to huge demand in electric power, which will aggravate the power grid load. This leads to an exploration for alternative and clean sources of energy to charge EVs. This project implements solar energy system to erect a charging station for EV application. The charging station employs multi-port charging by providing a constant voltage DC bus. The charging controllers are operated based on the concept of power balance, and constant current/constant voltage charging. Performance of the charging system is validated with simulation and experimental results.
Generation of Higher Number of Voltage Levels by Stacking Inverters of Lower ...Asoka Technologies
This paper proposes a new method of generating higher number of levels in the voltage waveform by stacking multilevel converters with lower voltage space vector structures. An important feature of this stacked structure is the use of low voltage devices while attaining higher number of levels. This will find extensive applications in electric vehicles since direct battery drive is possible. The voltages of all the capacitors in the structure can be controlled within a switching cycle using the switching state redundancies (pole voltage redundancies). This helps in reducing the capacitor size. Also, the capacitor voltages can be balanced irrespective of modulation index and load power factor. To verify the concept experimentally, a 9-level inverter is developed by stacking two 5-level inverters and an induction motor is run using V/f control scheme. Both steady state and transient results are presented.
Novel symmetric modular hybrid multilevel inverter with reduced number of sem...Asoka Technologies
In this paper, by using a modular hybrid structure, a new topology for symmetric multilevel inverters (MLI) with a small number of semiconductors and low voltage stress across switches is proposed. Despite many other topologies, this topology can inherently produce negative levels and zero levels without using the H-bridge. The voltage stress across a particular switch of the proposed MLI is inversely proportional to the number of the switching of that switch in a voltage period. The proposed structure is based on two types of module, that is, the f-module and the e-module. The e-module uses a capacitive voltage divider to double the number of non-zero levels. The voltages of the capacitors are approximately balanced without complex control methods. The basic structure of the proposed topology is formed by connecting the f-module and the e-module in series with each other, and the cascaded topology is developed by cascading multiple f-modules with an e-module. To investigate the proposed topology and proving its practicability, simulation results with MATLAB/Simulink, investigation of the capacitor voltages, loss calculations and experimental results are presented. A comparative study is also performed to show the merit of the new multilevel inverter over other topologies.
A Variable DC Link based Novel Multilevel Inverter Topology for Low Voltage A...Asoka Technologies
In this paper; a variable dc link based novel multilevel inverter (MLI) topology is proposed. This proposed topology comprises two variable dc links and a modified H-bridge unit. This new single-phase topology offers advantages such as reduction in count of switches; gate drivers and dc sources while simultaneously improving the power quality. The proposed topology has been analyzed for both symmetric and asymmetric modes of operation. A comparative study of the proposed topology with some recent MLI topologies has been presented. The comparative study indicates that the proposed topology requires less number of dc sources; switches and driver circuits as compared to other topologies. The proposed topology has been simulated for 31- level asymmetric configuration in MATLAB/SIMULINK environment to verify the proper operation of proposed topology. Harmonic analysis was also performed for 31-level inverter which showed significant reduction in the total harmonic distortion (THD) for phase voltage and current waveforms. The proposed topology is suitable for low voltage applications such as standalone photovoltaic (PV) systems and hybrid electric vehicles (HEVs).
A Simplified Space Vector Pulse-Width Modulation Scheme for Three-Phase Casca...Asoka Technologies
A simplified space vector pulse-width modulation (SVPWM) for three-phase cascaded H-bridge (CHB) inverters is presented in this paper. Treating each unit as a three-level inverter and adopting serial calculation mode, a CHB inverter is modulated unit by unit using three-level SVPWM. Duty cycles of real sector are obtained by mapping duty cycles of sector 1, in which the calculation of three-level SVPWM is done. The process to implement multilevel SVPWM is simplified to the process to implement three-level SVPWM. By reusing FPGA chip resource which is used for the calculation of three-level SVPWM, the presented SVPWM can be easily adopted to a CHB inverter with different number of units, while the FPGA chip resource utilization is reduced significantly. In addition, the presented SVPWM provides an effective switching frequency higher than the switching frequency of IGBTs. Simulation and experimental results are provided to verify the feasibility of the presented SVPWM.
A New Family of Step-up Hybrid Switched- Capacitor Integrated Multilevel Inve...Asoka Technologies
In the low voltage based renewable systems like PV and Fuel cell applications, the step-up of the output voltage to drive the loads is essential. For this, the integration of switched-capacitor (SC) units with the dc-ac converters will have the potential advantages like improved efficiency, optimal switching devices, small size of passive elements (L and C) as compared with traditional two-stage conversion system (dc/dc converter and dc/ac converter). This paper focuses on a new family of step-up multilevel inverter topologies with switched capacitor integration with dual input voltage sources. With the flexibility of 2 dc sources and switching capacitor circuits, four different topologies have been suggested in this paper with features of high voltage gain, reduced component count, reduced voltage stress and self-voltage balancing of the capacitor while achieving a higher number of levels. A detailed analysis of proposed multilevel inverters has been analyzed with the symmetrical and asymmetrical mode of operations and the associated gain, the number of levels, and other performance indices are presented. An in-depth study of all the topologies has been accomplished in this paper with several comparative studies in terms of components count, voltage gain and cost. The effectiveness and practicability of the suggested topology with 13 level output voltage has been explained by the experimental results obtained from a scale down prototype.
A multi cell 21-level hybrid multilevel inverter synthesizes a reduced number...Asoka Technologies
A multi-cell hybrid 21-Level multilevel inverter is proposed in this paper. The proposed topology includes two-unit; an H-bridge is cascaded with a modified K-type unit to generate an output voltage waveform with 21 levels based only on two unequal DC suppliers. The proposed topology's advantage lies in the fine and clear output voltage waveforms with high output efficiency. Meanwhile, the high number of output voltage waveform levels generates a low level of distortion and reduces the level of an electromagnetic interface (EMI). Moreover, it reduces the voltage stress on the switching devices and gives it a long lifetime. Also, the reduction in the number of components has a noticeable role in saving size and cost. Regarding the capacitors charging, the proposed topology presents an online method for charging and balancing the capacitor's voltage without any auxiliary circuits. The proposed topology can upgrade to a high number of output steps through the cascading connection. Undoubtedly this cascading will increase the power level to medium and high levels and reduce the harmonics content to a neglectable rate. The proposed system has been tested through the simulation results, and an experimental prototype based on the controller dSPACE (DS-1103) hardware unit used to support the simulation results.
A generalized multilevel inverter topology with reduction of total standing v...Asoka Technologies
This paper presents a new multilevel inverter topology with reduced active switches and total standing voltage. The proposed topology can generate a high number of voltage levels in the symmetric configuration. This topology intuitively generates positive and negative cycles without an additional H-bridge unit, which considerably reduces the total standing voltage of the inverter. A cascaded structure is developed from the proposed topology to create higher voltage levels. To show the novelty of the proposed topology, a thorough comparison between the available and the proposed topologies in terms of the number of switches, standing voltages, and dc-sources is presented. Furthermore, the power loss analysis is carried out for various load values. The feasibility of the proposed nine-level inverter is verified with simulation and experimental results.
Power Quality Improvement in Solar Fed Cascaded Multilevel Inverter with Outp...Asoka Technologies
The presence of harmonics in solar Photo Voltaic (PV) energy conversion system results in deterioration of power quality. To address such issue, this paper aims to investigate the elimination of harmonics in a solar fed cascaded fifteen level inverter with aid of Proportional Integral (PI), Artificial Neural Network (ANN) and Fuzzy Logic (FL) based controllers. Unlike other techniques, the proposed FLC based approach helps in obtaining reduced harmonic distortions that intend to an enhancement in power quality. In addition to the power quality improvement, this paper also proposed to provide output voltage regulation in terms of maintaining voltage and frequency at the inverter output end in compatible with the grid connection requirements. The simulations are performed in the MATLAB / Simulink environment for solar fed cascaded 15 level inverter incorporating PI, ANN and FL based controllers. To exhibit the proposed technique, a 3 kWp photovoltaic plant coupled to multilevel inverter is designed and hardware is demonstrated. All the three techniques are experimentally investigated with the measurement of power quality metrics along with establishing output voltage regulation.
Residential Community Load Management based on Optimal Design of Standalone H...Asoka Technologies
Microgrids being an important entity in the distribution system, and to get their full advantages
by incorporating maximum distributed generation, standalone hybrid renewable energy systems (HRESs), being environmentally-safe and economically-efficient, are considered as the promising solution to electrify remote areas where the grid power is not available. In this work, a techno-economic investigation with an optimal design of HRES is presented to fulfill the domestic electricity need for a residential area of the Sherani district in the Province of Baluchistan, Pakistan. Nine case studies based on PV/wind/diesel/battery are analyzed based on net present cost (NPC), cost of energy (COE), and emission to decide the feasible solution. HOMER tool is utilized to accomplish modeling and simulation for economic analysis and optimal sizing. Simulation results demonstrated that HRES with PV-wind-battery is the most viable option for the specified area, and the optimal sizing of components are also obtained with $ 28,620 NPC and 0.311 $/kWh COE which shows 81.65% reduction in cost and 100% preserving in toxic emission while fulfilling 100% energy demand with 67.3% of excess energy. Furthermore, MATLAB/Simulink modeling for the optimally designed system is built for technical analysis while its effectiveness is proved by keeping dc and ac buses voltage constant, safe operating range of battery state of charge (SOC) with active power balance between HRES components, as well as efficient ac voltage quality, regardless of generation disturbances and load fluctuations. The output signal has total harmonic distortion (THD) of 0.30% as compared to 5.44% with the conventional control scheme. The novelty lies in the sequential application of both HOMER and MATLAB simulations of the proposed HRES model and validation of the proposition for the studied area; by using and implementing model predictive control (MPC) of a reconfigurable inverter.
Reliability evaluation of MPPT based interleaved boost converter for PV systemAsoka Technologies
The demand for power supply and depletion of the conventional energy sources are increasing drastically. So to overcome this problem, the best alternative power generation for conventional fossil fuel is Photovoltaic solar cell based system because of its advantage of pollution free and its availability in abundance with free of cost. In the MPPT based PV system the converters are the most sensitive part. Therefore to provide uninterrupted power supply without compromising the quality of power, reliability evaluation of interleaved boost converter becomes necessary. MATLAB/Simulink is used for the simulation studies and to determine the power losses of various components of the converter which is used in calculating the failure rates and reliability of the interleaved boost converter. Reliability studies of IBC have not been studied much. However there exists few literature in which reliability expression has been developed using Markov technique which is a more complex method as compare to Reliability Block Diagram (RBD). Therefore this paper proposes reliability modeling and reliability evaluation of Interleaved boost converter in MPPT based photo-voltaic system by using simple RBD method.
Power Quality Improvement of Grid-Connected Photovoltaic Systems Using Trans-...Asoka Technologies
Voltage-source inverter has been used widely in traditional photovoltaic systems which have limitations. To overcome, Z-source inverter has been introduced. In spite of all the features introduced in Z-source inverter, its configuration has been improved over the years, like trans-Z-source inverter which has added advantages compared to traditional inverters, namely buck–boost feature, lesser passive elements, and higher voltage boost gain. In this paper, photovoltaic arrays are connected to the grid via the trans-Z-source inverter with the aim of improving its power quality. Moreover, the shoot through duty ratio is kept constant in the switching control method to add features like lower voltage stress (higher reliability), lower total harmonic distortion (lower maintenance cost), and higher voltage boost ratio. To evaluate the precision of the proposed system, the photovoltaic system is simulated on a standard grid and under partial shading condition which brings about voltage sag, and hence, a dynamic voltage restorer is used to mitigate voltage sag. Simulation results are presented to verify the validation of the proposed photovoltaic system in terms of voltage and current THD reducing 78.2% and 19.7%, respectively.
Power optimisation scheme of induction motor using FLC for electric vehicleAsoka Technologies
In electric vehicles (EVs) and hybrid EVs, energy efficiency is essential where the energy storage is limited. Adding to its high stability and low cost, the induction motor efficiency improves with loss minimisation. Also, it can consume more power than the actual need to perform its working when it is operating in less than full load condition. This study proposes a control strategy based on the fuzzy logic control (FLC) for EV applications. FLC controller can improve the starting current amplitude and saves more power. Through the MATLAB/SIMULINK software package, the performance of this control was verified through simulation. As compared with the conventional proportional integral derivative controller, the simulation schemes show good, high-performance results in time-domain response and rapid rejection of system-affected disturbance. Therefore, the core losses of the induction motor are greatly reduced, and in this way improves the efficiency of the driving system. Finally, the suggested control system is validated by the experimental results obtained in the authors’ laboratory, which are in good agreement with the simulation results.
Power Flow Control of Interconnected AC-DC Microgrids in Grid-Connected Hybri...Asoka Technologies
This paper introduces a new approach for power flow control of interconnected AC-DC microgrids in grid-connected hybrid microgrids based on implementing a modified unified interphase power controller (UIPC). A typical grid-connected hybrid microgrid including one AC microgrid and one DC microgrid is considered as studied system. Instead of using the parallel-connected power converters, these microgrids are interconnected using a modified UIPC. As the first contribution of this paper, the conventional structure of UIPC, which uses three power converters in each phase, is modified so that a reduced number of power converters is implemented for power exchange control between AC-DC microgrids. The modified structure includes one power converter in each phase, named as line power converter (LPC), and a power converter which regulates the DC bus voltage, named as bus power converter (BPC) here. The AC microgrid is connected to the main grid through the LPCs which their DC buses are linked and can operate in capacitance mode (CM) or inductance mode (IM). A fuzzy logic controller is used in the control structure of the LPCs. The fuzzy inference system is optimized based on H∞ filtering method to reduce the errors in membership functions design. Through the BPC, the DC voltage of LPCs is supplied by the DC microgrid. However, since the DC microgrid voltage is provided here by a PV system, the DC link voltage of the LPCs is fluctuating. Thus, as the second contribution, to stabilize the DC link fluctuations, a new nonlinear disturbance observer based robust multiple-surface sliding mode control (NDO-MS-SMC) strategy is presented for DC side control of the BPC. The simulation results confirm the effectiveness of the proposed power flow control strategy of the improved UIPC for hybrid microgrids.
Power flow control of hybrid micro grids using modified uipcAsoka Technologies
Neuro Fuzzy Inference System (ANFIS) controlled modified Unified Inter-Phase Power Controller (UIPC). For study, a classic hybrid micro-grid connected to grid comprising of a AC micro-grid and a DC micro-grid is taken into account. These micro-grids are interconnected employing a modified UIPC, rather than using the power converters connected in parallel. As the first input of this paper is the standard structure of UIPC, which used three power converters in every phase. It was then modified such as number of power converters is used less and implemented for the control of the exchange of power between AC-DC microgrids. In every phase there is one power electronic converter in the improved structure. It is called as Line Power Converter (LPC). Also there is Bus Power Converter (BPC) to regulate the voltage of the DC bus. The Line Power Converters links the AC micro-grid to the main grid. The DC buses are also linked with them. It can be operated in Inductance Mode (IM) as well as Capacitance Mode (CM). The control structure of LPCs has an Adaptive Fuzzy Logic Controller in it. For hybrid micro-grids, the capability of the suggested power flow control strategy is confirmed by the MATLAB simulation results.
Multifunctional grid tied pv system using modified klms controlAsoka Technologies
This paper deals with the modified kernel least mean square (KLMS) control strategy in double-stage, solar photovoltaic (PV) grid tied system to enhance the power quality at common coupling point (CCP). This proposed control algorithm has less oscillations, fast convergence, fast dynamic response and good steady state performance. A control strategy is used to extract the fundamental active current component of load and generates reference grid current for a DC-AC converter. The proposed modified KLMS control mitigates multiple power quality concerns such as harmonics reduction, unity power factor and load balancing. The dynamic performance of proposed system is confirmed into the MATLAB\Simulink environment. Test results on hardware implementation are presented at varying solar irradiation levels and load unbalancing. Test results are found satisfactory and total harmonic distortion (THD) of the grid currents are observed well within the IEEE-519 standard.
Modelling and voltage control of the solar wind hybrid micro-grid with optimi...Asoka Technologies
Electricity generation from the wind and solar photovoltaic (PV) systems are highly dependent upon weather conditions. Their intermittent nature leads to fluctuations in their output. Therefore, the need for rapid compensation for energy transmission and distribution systems is increasingly important. Static Synchronous Compensator (STATCOM) can be adopted for reactive power compensation and for decreasing the voltage fluctuation caused by the system and renewable energy sources. This study presents modelling of a Solar PV-Wind Hybrid Micro-grid and the increase of the stable operating limit of the system in case of the incorporation of STATCOM is examined. The major contribution of this paper is the optimization of gain parameters of four PI controllers in STATCOM control circuit based on genetic algorithms (GA) and Bacteria Foraging Algorithm (BFA) and therefore obtaining better responses and voltage stability in terms of nonlinear nature of solar-wind hybrid micro-grid. The Simulink models of the system architecture include a wind turbine model, a solar PV power system model and a STATCOM. It is certified that the voltage fluctuation at the end of the bus bar is reduced by 8% using conventional PI controller, by 10% for GA-based PI controller, and by 15% for BFA based PI controller under variable load. The results obtained by GA and BFA-based optimization of PI controllers are compared with that of the conventional controller and better results attained.
Irradiance-adaptive PV Module Integrated Converter for High Efficiency and Po...Asoka Technologies
The strive for efficient and cost-effective photovoltaic systems motivated the power electronic design developed here. The work resulted in a DC-DC converter for module integration and distributed maximum power point tracking (MPPT) with a novel adaptive control scheme. The latter is essential for the combined features of high energy efficiency and high power quality over a wide range of operating conditions. The switching frequency is optimally modulated as a function of solar irradiance for power conversion efficiency maximization. With the rise of irradiance, the frequency is reduced to reach the conversion efficiency target. A search algorithm is developed to determine the optimal switching frequency step. Reducing the switching frequency may, however, compromise MPPT efficiency. Furthermore, it leads to increased ripple content. Therefore, to achieve a uniform high power quality at all conditions, interleaved converter cells are adaptively activated. The overall cost is kept low by selecting components that allow for implementing the functions at low cost. Simulation results show the high value of the module integrated converter for DC standalone and microgrid applications. A 400 W prototype was implemented at 0.14 Euro/W. Testing showed efficiencies above 95% taking into account all losses from power conversion, MPPT, and measurement and control circuitry.
Intelligent Power Sharing of DC Isolated Microgrid Based on Fuzzy Sliding Mod...Asoka Technologies
Linear droop control can realize power sharing among generators in DC microgrid without relying on critical communication links. However, the droop relationship between output power and voltage magnitude of renewable power generate system is nonlinear with uncertainties and disturbances from renewable sources and loads in practical DC microgrid. A novel droop scheme is proposed for an isolated DC microgrid to solve the nonlinear problem. The control strategy is proposed by using the Takagi-Sugeno (T-S) fuzzy model and sliding mode algorithm. The nonlinear droop characteristics can be represented by T-S model through taking advantage of locally measured output variables. The sliding mode droop controller is designed for compensating the uncertainties and disturbances to derive accurate power sharing based on T-S fuzzy model. The proposed scheme is proved to be effective under variable operating conditions through PSIM/Matlab simulation.
Implementation of solar pv battery and diesel generator based electric vehic...Asoka Technologies
In this paper, a solar PV (Photovoltaic) array, a battery energy storage (BES), a diesel generator (DG) set and grid based EV charging station (CS) is utilized to provide the incessant charging in islanded, grid connected and DG set connected modes. The charging station is primarily designed to use the solar photovoltaic PV array and a BES to charge the electric vehicle (EV) battery. However, in case of exhausted storage battery and unavailable solar PV array generation, the charging station intelligently takes power from the grid or DG (Diesel Generator) set. However, the power from DG set is drawn in a manner that, it always operates at 80-85% loading to achieve maximum fuel efficiency under all loading conditions. Moreover, in coordination with the storage battery, the charging station regulates the generator voltage and frequency without a mechanical speed governor. It also ensures that the power drawn from the grid or the DG set is at unity power factor (UPF) even at nonlinear loading. Moreover, the PCC (Point of Common Coupling) voltage is synchronized to the grid/ generator voltage to obtain the ceaseless charging. The charging station also performs the vehicle to grid active/reactive power transfer, vehicle to home and vehicle to vehicle power transfer for increasing the operational efficiency of the charging station. The operation of the charging station is experimentally validated using the prototype developed in the laboratory.
In this paper, a high step-up Quasi-Z Source (QZS) DC-DC converter is proposed. This converter uses a hybrid switched-capacitors switched-inductor method in order to achieve high voltage gains. The proposed converter have resolved the voltage gain limitation of the basic QZS DC-DC converter while keeping its main advantages such as continuous input current and low voltage stress on capacitors. Compared to the basic converter, the duty cycle is not limited, and the voltage stress on the diodes and switch isn’t increased. In addition to these features, the proposed converter has a flexible structure, and extra stages could be added to it in order to achieve even higher voltage gains without increasing the voltage stress on devices or limiting the duty cycle. The operation principle of the converter and related relationships and waveforms are presented in the paper. Also, a comprehensive comparison between the proposed and other QZS based DC-DC converters is provided which confirms the superiority of the proposed converter. Simulations are done in PSCAD/EMTDC in order to investigate the MPPT capability of the converter. In addition, the valid performance and practicality of the converter are studied through the results obtained from the laboratory built prototype.
Fuel cell integrated unified power quality conditioner for voltage and curren...Asoka Technologies
Electrical and electronic devices when exposed to one or more power quality problems are prone to failure. This paper aims to enhance the quality of power in three-phase four-wire distribution grid using Fuel Cell Integrated Unified Power Quality Conditioner (FCI-UPQC). The proposed FCI-UPQC has four-leg converter on the shunt side and three-leg converter on the series side. A combination of a synchronous reference frame (SRF) and Instantaneous Reactive Power (IRP) theories are utilized to generate reference signals of the FCI-UPQC. Also, this paper proposes Adaptive Neuro-Fuzzy Inference System controller to maintain DC link voltage in the FCI-UPQC. The Adaptive Neuro-Fuzzy Inference System controller is designed like a sugeno fuzzy architecture and trained offline using data from the Proportional Integral (PI) controller. The obtained results proved that the proposed FCI-UPQC compensated power quality problems such as voltage sag, swell, harmonics, neutral current, source current imbalance in three-phase four-wire distribution grid. The presence of fuel cell in this work makes more effectiveness of the proposed system by providing real power support during supply interruption on the grid side.
In this paper, a distributed incremental adaptive filter (DIAF) controlled utility interfaced photovoltaic (PV) - battery microgrid system is presented with power quality features. From protection aspects, grid tied solar inverters are required to shut down at loss of the utility. However, the multi-purpose PV-battery system is developed to provide energy to the critical loads, even at loss of distribution network. The bidirectional controlled converter with a battery also mitigates the intermittency of a PV array under rapid variations in the weather. The extracted maximum power is supplied to the voltage source converter (VSC), which is transferred to the nonlinear loads and the utility. The distributed incremental adaptive filter is used to control the VSC with contribution of PV power and the battery. In addition, the DIAF control provides harmonics mitigation, load balancing and power factor improvement functionalities in order to deal with system connected with nonlinear loads. A PV power feed-forward (PVFF) term is incorporated in the current control for injection of active power to the utility as well as to improve the dynamic operation of residential PV-battery microgrid. The battery energy storage (BES) reduces the fuel bills and it is also utilized to provide smoothing attributes to the microgrid. The effectiveness of PV-battery microgrid is validated experimentally developed in the laboratory.
Development of wind and solar based ac microgrid with power quality improveme...Asoka Technologies
This work proposes a microgrid (μ-grid) integrating wind and solar photovoltaic (PV) resources, along with the battery energy storage (BES) to the three phase grid feeding the nonlinear load. The μ-grid disconcerted by probabilistic nonlinear time dependent parameters and their effects are compensated by cohesive controllers used for utility grid side voltage source converter (GVSC) and machine side VSC (MVSC). The switching controls and the reconfigurability of the μ-grid are addressed on imperative aspects of improving power quality (PQ), power reliability, nonlinear load compensation and economic utilization of resources. The nonlinear load compensation and PQ enhancement are achieved by executing modified version of the adaptive filtering technique including “momentum” based least mean square (MLMS) control technique, utilized for providing the switching control signals to the GVSC. It utilizes two preceding gradient weights for obtaining updated weight thereby improving the convergence rate and overcoming the limitation of conventional control of the same family. The MVSC acquires its switching signals from conventional vector control scheme and the encoderless estimation of speed and rotor position of the synchronous generator (SG) driven by wind turbine through back electromotive force control technique. The external environmental disturbances are overcome by utilizing perturb and observe (P&O) maximum power point (MPP) for wind optimal power extraction and adaptive P&O with variable perturbation step size for solar MPP estimation. Test results are obtained from the laboratory prototype under steady state and dynamic conditions including altering wind speed, intermittent solar insolation and variable load conditions. The PQ issues are addressed and investigated successfully.
Application of Artificial Neural Networks for Shunt APF ControlAsoka Technologies
Artificial Neural Network (ANN) is becoming an attractive estimation and regression technique in many control applications due to its parallel computing nature and high learning capability. There has been a lot of effort in employing the ANN in shunt active power filter (APF) control applications. Adaptive Linear Neuron (ADALINE) and feed-forward Multilayer Neural Network (MNN) are the most commonly used ANN techniques to extract fundamental and/or harmonic components present in the non-linear currents. This paper aims to provide an in-depth understanding on realizing ADALINE and feed-forward MNN based control algorithms for shunt APF. A step-by-step procedure to implement these ANN based techniques, in Matlab/ Simulink environment, is provided. Furthermore, a detailed analysis on the performance, limitation and advantages of both methods is presented in the paper. The study is supported by conducting both simulation and experimental validations.
Control strategy of pmsg based wind energy conversion system under strong win...Asoka Technologies
This paper presents a control approach for the Permanent Magnet Synchronous Generator (PMSG) based Wind Energy Conversion Systems (WECS) under a wide range of wind speeds. Generally, most of the wind turbines are turned-off and disconnected from the power grid, in case wind velocity is gone over 25 m/s. It may cause wind power supply shortage from wind farms. This research introduces a pitch angle controller as well as a rotational speed control system so that the PMSG based WECS can generate power if the wind speeds are above 25 m/s. The proposed method reduces the mechanical stress of the wind turbine by preferential reducing of the rotational speed rather than the mechanical torque during strong wind condition. As a result, the chance of turning-off the is reduced compared to the conventional control system because the PMSG based WECS can temporarily tolerate the wind speed up to 35 m/s. A 2 MW WECS with the electrical and mechanical characteristics is modeled in the MATLAB/Sim Power Systems® to verify the proposed research.
Control and energy management of a large scale grid connected pv systemAsoka Technologies
Power quality is highlighted as an important parameter in modern power systems. Moreover, grid-connected photovoltaic power plants are increasing significantly in size and capacity. Elsewhere, due to the progressive integration of nonlinear loads in the grid, the principal role of a Solar Energy Conversion System (SECS) is not only to capture the maximum power from solar but, also to ensure some ancillary services and improve the quality of power. This paper presents a novel strategy dedicated to improve the management of active power generation, reactive power compensation and power quality of a SECS, while guaranteeing the possibility of exploiting the full capacity of the Power Conditioning System (PCS) and the PhotoVoltaic System (PVS). The proposed control algorithm is applied to a large scale PVS connected to the grid through a cascade of a DC-DC converter and a PWM inverter. This control strategy manages the SECS function’s priorities, between main active power generation, reactive power compensation and active filtering in such a way to guarantee a smooth and stable DC voltage and ensure a sinusoidal grid current. Top priority is given to the active power production over power quality improvement. Then, priority is given to reactive power compensation over mitigation of current harmonics absorbed by the non-linear load connected to the Point of Common Coupling (PCC). Moreover, the whole system upper limits of active and reactive powers have been determined in the (PQ) power plane on the basis of PVS available power, converters rated power and DC bus voltage smoothness and stability. Finally, a control procedure dedicated to the calculation of the inverter current commands is proposed in order to exploit the full capacity of the SECS and respect the determined power limits. Simulation results confirm the effectiveness and the performance of this control strategy and prove that the SECS can operate at its full power whilst the power quality can be improved by reactive power compensation and active filtering.
Application of boost converter to increase the speed range of dual stator win...Asoka Technologies
In this paper, a topology using a Dual-stator Winding Induction Generator (DWIG) and a boost converter is proposed for the variable speed wind power application. At low rotor speeds, the generator saturation limits the voltage of the DWIG. Using a boost converter, higher DC voltage can be produced while the DWIG operates at Maximum Power Point Tracking (MPPT) even at low speed and low voltage conditions. Semiconductor Excitation Controller (SEC) of the DWIG utilizes Control-Winding Voltage Oriented Control (CWVOC) method to adjust the voltage, considering V/f characteristics. For the proposed topology, the SEC capacity and the excitation capacitor is optimized by analyzing the SEC reactive current considering wind turbine power-speed curve, V/f strategy, and the generator parameters. The method shows that the per-unit capacity of the SEC can be limited to the inverse of DWIG magnetizing reactance per-unit value. The topology is simulated in MATLAB/Simulink platform and experimented with a scaled 1 kW prototype. Both simulation and experimental results demonstrate wide variable speed operation range of the DWIG and verify the optimization.
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Power Quality Improvement in Solar Fed Cascaded Multilevel Inverter with Outp...Asoka Technologies
The presence of harmonics in solar Photo Voltaic (PV) energy conversion system results in deterioration of power quality. To address such issue, this paper aims to investigate the elimination of harmonics in a solar fed cascaded fifteen level inverter with aid of Proportional Integral (PI), Artificial Neural Network (ANN) and Fuzzy Logic (FL) based controllers. Unlike other techniques, the proposed FLC based approach helps in obtaining reduced harmonic distortions that intend to an enhancement in power quality. In addition to the power quality improvement, this paper also proposed to provide output voltage regulation in terms of maintaining voltage and frequency at the inverter output end in compatible with the grid connection requirements. The simulations are performed in the MATLAB / Simulink environment for solar fed cascaded 15 level inverter incorporating PI, ANN and FL based controllers. To exhibit the proposed technique, a 3 kWp photovoltaic plant coupled to multilevel inverter is designed and hardware is demonstrated. All the three techniques are experimentally investigated with the measurement of power quality metrics along with establishing output voltage regulation.
Residential Community Load Management based on Optimal Design of Standalone H...Asoka Technologies
Microgrids being an important entity in the distribution system, and to get their full advantages
by incorporating maximum distributed generation, standalone hybrid renewable energy systems (HRESs), being environmentally-safe and economically-efficient, are considered as the promising solution to electrify remote areas where the grid power is not available. In this work, a techno-economic investigation with an optimal design of HRES is presented to fulfill the domestic electricity need for a residential area of the Sherani district in the Province of Baluchistan, Pakistan. Nine case studies based on PV/wind/diesel/battery are analyzed based on net present cost (NPC), cost of energy (COE), and emission to decide the feasible solution. HOMER tool is utilized to accomplish modeling and simulation for economic analysis and optimal sizing. Simulation results demonstrated that HRES with PV-wind-battery is the most viable option for the specified area, and the optimal sizing of components are also obtained with $ 28,620 NPC and 0.311 $/kWh COE which shows 81.65% reduction in cost and 100% preserving in toxic emission while fulfilling 100% energy demand with 67.3% of excess energy. Furthermore, MATLAB/Simulink modeling for the optimally designed system is built for technical analysis while its effectiveness is proved by keeping dc and ac buses voltage constant, safe operating range of battery state of charge (SOC) with active power balance between HRES components, as well as efficient ac voltage quality, regardless of generation disturbances and load fluctuations. The output signal has total harmonic distortion (THD) of 0.30% as compared to 5.44% with the conventional control scheme. The novelty lies in the sequential application of both HOMER and MATLAB simulations of the proposed HRES model and validation of the proposition for the studied area; by using and implementing model predictive control (MPC) of a reconfigurable inverter.
Reliability evaluation of MPPT based interleaved boost converter for PV systemAsoka Technologies
The demand for power supply and depletion of the conventional energy sources are increasing drastically. So to overcome this problem, the best alternative power generation for conventional fossil fuel is Photovoltaic solar cell based system because of its advantage of pollution free and its availability in abundance with free of cost. In the MPPT based PV system the converters are the most sensitive part. Therefore to provide uninterrupted power supply without compromising the quality of power, reliability evaluation of interleaved boost converter becomes necessary. MATLAB/Simulink is used for the simulation studies and to determine the power losses of various components of the converter which is used in calculating the failure rates and reliability of the interleaved boost converter. Reliability studies of IBC have not been studied much. However there exists few literature in which reliability expression has been developed using Markov technique which is a more complex method as compare to Reliability Block Diagram (RBD). Therefore this paper proposes reliability modeling and reliability evaluation of Interleaved boost converter in MPPT based photo-voltaic system by using simple RBD method.
Power Quality Improvement of Grid-Connected Photovoltaic Systems Using Trans-...Asoka Technologies
Voltage-source inverter has been used widely in traditional photovoltaic systems which have limitations. To overcome, Z-source inverter has been introduced. In spite of all the features introduced in Z-source inverter, its configuration has been improved over the years, like trans-Z-source inverter which has added advantages compared to traditional inverters, namely buck–boost feature, lesser passive elements, and higher voltage boost gain. In this paper, photovoltaic arrays are connected to the grid via the trans-Z-source inverter with the aim of improving its power quality. Moreover, the shoot through duty ratio is kept constant in the switching control method to add features like lower voltage stress (higher reliability), lower total harmonic distortion (lower maintenance cost), and higher voltage boost ratio. To evaluate the precision of the proposed system, the photovoltaic system is simulated on a standard grid and under partial shading condition which brings about voltage sag, and hence, a dynamic voltage restorer is used to mitigate voltage sag. Simulation results are presented to verify the validation of the proposed photovoltaic system in terms of voltage and current THD reducing 78.2% and 19.7%, respectively.
Power optimisation scheme of induction motor using FLC for electric vehicleAsoka Technologies
In electric vehicles (EVs) and hybrid EVs, energy efficiency is essential where the energy storage is limited. Adding to its high stability and low cost, the induction motor efficiency improves with loss minimisation. Also, it can consume more power than the actual need to perform its working when it is operating in less than full load condition. This study proposes a control strategy based on the fuzzy logic control (FLC) for EV applications. FLC controller can improve the starting current amplitude and saves more power. Through the MATLAB/SIMULINK software package, the performance of this control was verified through simulation. As compared with the conventional proportional integral derivative controller, the simulation schemes show good, high-performance results in time-domain response and rapid rejection of system-affected disturbance. Therefore, the core losses of the induction motor are greatly reduced, and in this way improves the efficiency of the driving system. Finally, the suggested control system is validated by the experimental results obtained in the authors’ laboratory, which are in good agreement with the simulation results.
Power Flow Control of Interconnected AC-DC Microgrids in Grid-Connected Hybri...Asoka Technologies
This paper introduces a new approach for power flow control of interconnected AC-DC microgrids in grid-connected hybrid microgrids based on implementing a modified unified interphase power controller (UIPC). A typical grid-connected hybrid microgrid including one AC microgrid and one DC microgrid is considered as studied system. Instead of using the parallel-connected power converters, these microgrids are interconnected using a modified UIPC. As the first contribution of this paper, the conventional structure of UIPC, which uses three power converters in each phase, is modified so that a reduced number of power converters is implemented for power exchange control between AC-DC microgrids. The modified structure includes one power converter in each phase, named as line power converter (LPC), and a power converter which regulates the DC bus voltage, named as bus power converter (BPC) here. The AC microgrid is connected to the main grid through the LPCs which their DC buses are linked and can operate in capacitance mode (CM) or inductance mode (IM). A fuzzy logic controller is used in the control structure of the LPCs. The fuzzy inference system is optimized based on H∞ filtering method to reduce the errors in membership functions design. Through the BPC, the DC voltage of LPCs is supplied by the DC microgrid. However, since the DC microgrid voltage is provided here by a PV system, the DC link voltage of the LPCs is fluctuating. Thus, as the second contribution, to stabilize the DC link fluctuations, a new nonlinear disturbance observer based robust multiple-surface sliding mode control (NDO-MS-SMC) strategy is presented for DC side control of the BPC. The simulation results confirm the effectiveness of the proposed power flow control strategy of the improved UIPC for hybrid microgrids.
Power flow control of hybrid micro grids using modified uipcAsoka Technologies
Neuro Fuzzy Inference System (ANFIS) controlled modified Unified Inter-Phase Power Controller (UIPC). For study, a classic hybrid micro-grid connected to grid comprising of a AC micro-grid and a DC micro-grid is taken into account. These micro-grids are interconnected employing a modified UIPC, rather than using the power converters connected in parallel. As the first input of this paper is the standard structure of UIPC, which used three power converters in every phase. It was then modified such as number of power converters is used less and implemented for the control of the exchange of power between AC-DC microgrids. In every phase there is one power electronic converter in the improved structure. It is called as Line Power Converter (LPC). Also there is Bus Power Converter (BPC) to regulate the voltage of the DC bus. The Line Power Converters links the AC micro-grid to the main grid. The DC buses are also linked with them. It can be operated in Inductance Mode (IM) as well as Capacitance Mode (CM). The control structure of LPCs has an Adaptive Fuzzy Logic Controller in it. For hybrid micro-grids, the capability of the suggested power flow control strategy is confirmed by the MATLAB simulation results.
Multifunctional grid tied pv system using modified klms controlAsoka Technologies
This paper deals with the modified kernel least mean square (KLMS) control strategy in double-stage, solar photovoltaic (PV) grid tied system to enhance the power quality at common coupling point (CCP). This proposed control algorithm has less oscillations, fast convergence, fast dynamic response and good steady state performance. A control strategy is used to extract the fundamental active current component of load and generates reference grid current for a DC-AC converter. The proposed modified KLMS control mitigates multiple power quality concerns such as harmonics reduction, unity power factor and load balancing. The dynamic performance of proposed system is confirmed into the MATLAB\Simulink environment. Test results on hardware implementation are presented at varying solar irradiation levels and load unbalancing. Test results are found satisfactory and total harmonic distortion (THD) of the grid currents are observed well within the IEEE-519 standard.
Modelling and voltage control of the solar wind hybrid micro-grid with optimi...Asoka Technologies
Electricity generation from the wind and solar photovoltaic (PV) systems are highly dependent upon weather conditions. Their intermittent nature leads to fluctuations in their output. Therefore, the need for rapid compensation for energy transmission and distribution systems is increasingly important. Static Synchronous Compensator (STATCOM) can be adopted for reactive power compensation and for decreasing the voltage fluctuation caused by the system and renewable energy sources. This study presents modelling of a Solar PV-Wind Hybrid Micro-grid and the increase of the stable operating limit of the system in case of the incorporation of STATCOM is examined. The major contribution of this paper is the optimization of gain parameters of four PI controllers in STATCOM control circuit based on genetic algorithms (GA) and Bacteria Foraging Algorithm (BFA) and therefore obtaining better responses and voltage stability in terms of nonlinear nature of solar-wind hybrid micro-grid. The Simulink models of the system architecture include a wind turbine model, a solar PV power system model and a STATCOM. It is certified that the voltage fluctuation at the end of the bus bar is reduced by 8% using conventional PI controller, by 10% for GA-based PI controller, and by 15% for BFA based PI controller under variable load. The results obtained by GA and BFA-based optimization of PI controllers are compared with that of the conventional controller and better results attained.
Irradiance-adaptive PV Module Integrated Converter for High Efficiency and Po...Asoka Technologies
The strive for efficient and cost-effective photovoltaic systems motivated the power electronic design developed here. The work resulted in a DC-DC converter for module integration and distributed maximum power point tracking (MPPT) with a novel adaptive control scheme. The latter is essential for the combined features of high energy efficiency and high power quality over a wide range of operating conditions. The switching frequency is optimally modulated as a function of solar irradiance for power conversion efficiency maximization. With the rise of irradiance, the frequency is reduced to reach the conversion efficiency target. A search algorithm is developed to determine the optimal switching frequency step. Reducing the switching frequency may, however, compromise MPPT efficiency. Furthermore, it leads to increased ripple content. Therefore, to achieve a uniform high power quality at all conditions, interleaved converter cells are adaptively activated. The overall cost is kept low by selecting components that allow for implementing the functions at low cost. Simulation results show the high value of the module integrated converter for DC standalone and microgrid applications. A 400 W prototype was implemented at 0.14 Euro/W. Testing showed efficiencies above 95% taking into account all losses from power conversion, MPPT, and measurement and control circuitry.
Intelligent Power Sharing of DC Isolated Microgrid Based on Fuzzy Sliding Mod...Asoka Technologies
Linear droop control can realize power sharing among generators in DC microgrid without relying on critical communication links. However, the droop relationship between output power and voltage magnitude of renewable power generate system is nonlinear with uncertainties and disturbances from renewable sources and loads in practical DC microgrid. A novel droop scheme is proposed for an isolated DC microgrid to solve the nonlinear problem. The control strategy is proposed by using the Takagi-Sugeno (T-S) fuzzy model and sliding mode algorithm. The nonlinear droop characteristics can be represented by T-S model through taking advantage of locally measured output variables. The sliding mode droop controller is designed for compensating the uncertainties and disturbances to derive accurate power sharing based on T-S fuzzy model. The proposed scheme is proved to be effective under variable operating conditions through PSIM/Matlab simulation.
Implementation of solar pv battery and diesel generator based electric vehic...Asoka Technologies
In this paper, a solar PV (Photovoltaic) array, a battery energy storage (BES), a diesel generator (DG) set and grid based EV charging station (CS) is utilized to provide the incessant charging in islanded, grid connected and DG set connected modes. The charging station is primarily designed to use the solar photovoltaic PV array and a BES to charge the electric vehicle (EV) battery. However, in case of exhausted storage battery and unavailable solar PV array generation, the charging station intelligently takes power from the grid or DG (Diesel Generator) set. However, the power from DG set is drawn in a manner that, it always operates at 80-85% loading to achieve maximum fuel efficiency under all loading conditions. Moreover, in coordination with the storage battery, the charging station regulates the generator voltage and frequency without a mechanical speed governor. It also ensures that the power drawn from the grid or the DG set is at unity power factor (UPF) even at nonlinear loading. Moreover, the PCC (Point of Common Coupling) voltage is synchronized to the grid/ generator voltage to obtain the ceaseless charging. The charging station also performs the vehicle to grid active/reactive power transfer, vehicle to home and vehicle to vehicle power transfer for increasing the operational efficiency of the charging station. The operation of the charging station is experimentally validated using the prototype developed in the laboratory.
In this paper, a high step-up Quasi-Z Source (QZS) DC-DC converter is proposed. This converter uses a hybrid switched-capacitors switched-inductor method in order to achieve high voltage gains. The proposed converter have resolved the voltage gain limitation of the basic QZS DC-DC converter while keeping its main advantages such as continuous input current and low voltage stress on capacitors. Compared to the basic converter, the duty cycle is not limited, and the voltage stress on the diodes and switch isn’t increased. In addition to these features, the proposed converter has a flexible structure, and extra stages could be added to it in order to achieve even higher voltage gains without increasing the voltage stress on devices or limiting the duty cycle. The operation principle of the converter and related relationships and waveforms are presented in the paper. Also, a comprehensive comparison between the proposed and other QZS based DC-DC converters is provided which confirms the superiority of the proposed converter. Simulations are done in PSCAD/EMTDC in order to investigate the MPPT capability of the converter. In addition, the valid performance and practicality of the converter are studied through the results obtained from the laboratory built prototype.
Fuel cell integrated unified power quality conditioner for voltage and curren...Asoka Technologies
Electrical and electronic devices when exposed to one or more power quality problems are prone to failure. This paper aims to enhance the quality of power in three-phase four-wire distribution grid using Fuel Cell Integrated Unified Power Quality Conditioner (FCI-UPQC). The proposed FCI-UPQC has four-leg converter on the shunt side and three-leg converter on the series side. A combination of a synchronous reference frame (SRF) and Instantaneous Reactive Power (IRP) theories are utilized to generate reference signals of the FCI-UPQC. Also, this paper proposes Adaptive Neuro-Fuzzy Inference System controller to maintain DC link voltage in the FCI-UPQC. The Adaptive Neuro-Fuzzy Inference System controller is designed like a sugeno fuzzy architecture and trained offline using data from the Proportional Integral (PI) controller. The obtained results proved that the proposed FCI-UPQC compensated power quality problems such as voltage sag, swell, harmonics, neutral current, source current imbalance in three-phase four-wire distribution grid. The presence of fuel cell in this work makes more effectiveness of the proposed system by providing real power support during supply interruption on the grid side.
In this paper, a distributed incremental adaptive filter (DIAF) controlled utility interfaced photovoltaic (PV) - battery microgrid system is presented with power quality features. From protection aspects, grid tied solar inverters are required to shut down at loss of the utility. However, the multi-purpose PV-battery system is developed to provide energy to the critical loads, even at loss of distribution network. The bidirectional controlled converter with a battery also mitigates the intermittency of a PV array under rapid variations in the weather. The extracted maximum power is supplied to the voltage source converter (VSC), which is transferred to the nonlinear loads and the utility. The distributed incremental adaptive filter is used to control the VSC with contribution of PV power and the battery. In addition, the DIAF control provides harmonics mitigation, load balancing and power factor improvement functionalities in order to deal with system connected with nonlinear loads. A PV power feed-forward (PVFF) term is incorporated in the current control for injection of active power to the utility as well as to improve the dynamic operation of residential PV-battery microgrid. The battery energy storage (BES) reduces the fuel bills and it is also utilized to provide smoothing attributes to the microgrid. The effectiveness of PV-battery microgrid is validated experimentally developed in the laboratory.
Development of wind and solar based ac microgrid with power quality improveme...Asoka Technologies
This work proposes a microgrid (μ-grid) integrating wind and solar photovoltaic (PV) resources, along with the battery energy storage (BES) to the three phase grid feeding the nonlinear load. The μ-grid disconcerted by probabilistic nonlinear time dependent parameters and their effects are compensated by cohesive controllers used for utility grid side voltage source converter (GVSC) and machine side VSC (MVSC). The switching controls and the reconfigurability of the μ-grid are addressed on imperative aspects of improving power quality (PQ), power reliability, nonlinear load compensation and economic utilization of resources. The nonlinear load compensation and PQ enhancement are achieved by executing modified version of the adaptive filtering technique including “momentum” based least mean square (MLMS) control technique, utilized for providing the switching control signals to the GVSC. It utilizes two preceding gradient weights for obtaining updated weight thereby improving the convergence rate and overcoming the limitation of conventional control of the same family. The MVSC acquires its switching signals from conventional vector control scheme and the encoderless estimation of speed and rotor position of the synchronous generator (SG) driven by wind turbine through back electromotive force control technique. The external environmental disturbances are overcome by utilizing perturb and observe (P&O) maximum power point (MPP) for wind optimal power extraction and adaptive P&O with variable perturbation step size for solar MPP estimation. Test results are obtained from the laboratory prototype under steady state and dynamic conditions including altering wind speed, intermittent solar insolation and variable load conditions. The PQ issues are addressed and investigated successfully.
Application of Artificial Neural Networks for Shunt APF ControlAsoka Technologies
Artificial Neural Network (ANN) is becoming an attractive estimation and regression technique in many control applications due to its parallel computing nature and high learning capability. There has been a lot of effort in employing the ANN in shunt active power filter (APF) control applications. Adaptive Linear Neuron (ADALINE) and feed-forward Multilayer Neural Network (MNN) are the most commonly used ANN techniques to extract fundamental and/or harmonic components present in the non-linear currents. This paper aims to provide an in-depth understanding on realizing ADALINE and feed-forward MNN based control algorithms for shunt APF. A step-by-step procedure to implement these ANN based techniques, in Matlab/ Simulink environment, is provided. Furthermore, a detailed analysis on the performance, limitation and advantages of both methods is presented in the paper. The study is supported by conducting both simulation and experimental validations.
Control strategy of pmsg based wind energy conversion system under strong win...Asoka Technologies
This paper presents a control approach for the Permanent Magnet Synchronous Generator (PMSG) based Wind Energy Conversion Systems (WECS) under a wide range of wind speeds. Generally, most of the wind turbines are turned-off and disconnected from the power grid, in case wind velocity is gone over 25 m/s. It may cause wind power supply shortage from wind farms. This research introduces a pitch angle controller as well as a rotational speed control system so that the PMSG based WECS can generate power if the wind speeds are above 25 m/s. The proposed method reduces the mechanical stress of the wind turbine by preferential reducing of the rotational speed rather than the mechanical torque during strong wind condition. As a result, the chance of turning-off the is reduced compared to the conventional control system because the PMSG based WECS can temporarily tolerate the wind speed up to 35 m/s. A 2 MW WECS with the electrical and mechanical characteristics is modeled in the MATLAB/Sim Power Systems® to verify the proposed research.
Control and energy management of a large scale grid connected pv systemAsoka Technologies
Power quality is highlighted as an important parameter in modern power systems. Moreover, grid-connected photovoltaic power plants are increasing significantly in size and capacity. Elsewhere, due to the progressive integration of nonlinear loads in the grid, the principal role of a Solar Energy Conversion System (SECS) is not only to capture the maximum power from solar but, also to ensure some ancillary services and improve the quality of power. This paper presents a novel strategy dedicated to improve the management of active power generation, reactive power compensation and power quality of a SECS, while guaranteeing the possibility of exploiting the full capacity of the Power Conditioning System (PCS) and the PhotoVoltaic System (PVS). The proposed control algorithm is applied to a large scale PVS connected to the grid through a cascade of a DC-DC converter and a PWM inverter. This control strategy manages the SECS function’s priorities, between main active power generation, reactive power compensation and active filtering in such a way to guarantee a smooth and stable DC voltage and ensure a sinusoidal grid current. Top priority is given to the active power production over power quality improvement. Then, priority is given to reactive power compensation over mitigation of current harmonics absorbed by the non-linear load connected to the Point of Common Coupling (PCC). Moreover, the whole system upper limits of active and reactive powers have been determined in the (PQ) power plane on the basis of PVS available power, converters rated power and DC bus voltage smoothness and stability. Finally, a control procedure dedicated to the calculation of the inverter current commands is proposed in order to exploit the full capacity of the SECS and respect the determined power limits. Simulation results confirm the effectiveness and the performance of this control strategy and prove that the SECS can operate at its full power whilst the power quality can be improved by reactive power compensation and active filtering.
Application of boost converter to increase the speed range of dual stator win...Asoka Technologies
In this paper, a topology using a Dual-stator Winding Induction Generator (DWIG) and a boost converter is proposed for the variable speed wind power application. At low rotor speeds, the generator saturation limits the voltage of the DWIG. Using a boost converter, higher DC voltage can be produced while the DWIG operates at Maximum Power Point Tracking (MPPT) even at low speed and low voltage conditions. Semiconductor Excitation Controller (SEC) of the DWIG utilizes Control-Winding Voltage Oriented Control (CWVOC) method to adjust the voltage, considering V/f characteristics. For the proposed topology, the SEC capacity and the excitation capacitor is optimized by analyzing the SEC reactive current considering wind turbine power-speed curve, V/f strategy, and the generator parameters. The method shows that the per-unit capacity of the SEC can be limited to the inverse of DWIG magnetizing reactance per-unit value. The topology is simulated in MATLAB/Simulink platform and experimented with a scaled 1 kW prototype. Both simulation and experimental results demonstrate wide variable speed operation range of the DWIG and verify the optimization.
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Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
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1. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
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An Improved Current-Limiting Strategy for Shunt
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Optimization (PSO)
2018 IEEE
2 AT18-02
Transformerless Z-Source Four-Leg PV Inverter
with Leakage Current Reduction 2018 IEEE
3 AT18-03
Ensuring Power Quality and Stability in Industrial
and Medium Voltage Public Grids 2018 IEEE
4 AT18-04
A BL-CSC Converter Fed BLDC Motor Drive with
Power Factor Correction 2018 IEEE
5 AT18-05
Dual-Buck AC–AC Converter with Inverting and
Non-Inverting Operations 2018 IEEE
6 AT18-06
Self-tuned fuzzy-proportional–integral compensated
zero/minimum active power algorithm based
dynamic voltage restorer
2018 IET
7 AT18-06
Modeling, Implementation and Performance Analysis
of a Grid-Connected Photovoltaic/Wind Hybrid
Power System
2018 IEEE
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1 AT17-01
A Comparative Study of Different Multilevel
Converter Topologies for Battery Energy Storage
Application
2017 IEEE
2 AT17-02
A Low Cost Speed Estimation Technique for
Closed Loop Control of BLDC Motor Drive 2017 IEEE
3 AT17-03
A Synchronous Generator Based Diesel-PV
Hybrid Micro-grid with Power Quality Controller 2017 IEEE
4 AT17-04
A Synchronous Generator Based Diesel-PV
Hybrid Micro-grid with Power Quality Controller 2017 IEEE
5 AT17-05
An Intelligent Fuzzy Sliding Mode Controller for
a BLDC Motor 2017 IEEE
6 AT17-06
Analysis Of Solar Energy Embeded To
Distribution Grid For Active & Reactive Power
Supply To Grid
2017 IEEE
7 AT17-07
Cascaded Multilevel Inverter Based Electric
Spring for Smart Grid Applications 2017 IEEE
8 AT17-08
Comparative Simulation Results of DVR and D-
STATCOM to Improve Voltage Quality in
Distributed Power System
2017 IEEE
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Design and Evaluation of a Mini-Size SMES
Magnet for Hybrid Energy Storage Application in
a kW-Class Dynamic Voltage Restorer
2017 IEEE
10 AT17-10
Design of PID-Fuzzy for Speed Control of
Brushless DC Motor in Dynamic Electric Vehicle
to Improve Steady-State Performance
2017 IEEE
11 AT17-11
Direct Torque Control of PM BLDC Motor Using
Fuzzy Controllers 2017 IEEE
12 AT17-12
Double Closed Loop Control for BLDC based on
whole Fuzzy Controller 2014 IEEE
13 AT17-13
Dual-Bridge LLC Resonant Converter With Fixed-
Frequency PWM Control for Wide Input
Applications
2017 IEEE
14 AT17-14
A Two Degrees of Freedom Resonant Control
Scheme for Voltage Sag Compensation in
Dynamic Voltage Restorers 2017 IEEE
15 AT17-15
High Performance Non-Salient Sensorless BLDC
Motor Control Strategy from Standstill to High
Speed
2017 IEEE
16 AT17-16
Indirect Speed Estimation of High Speed
Brushless DC Motor Drive Using Fuzzy Logic
Current Compensator
2017 IEEE
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17 AT17-17
Modeling and Simulation of Closed Loop Speed
Control for BLDC Motor 2017 IEEE
18 AT17-18
Nine-level Asymmetrical Single Phase Multilevel
Inverter Topology with Low switching frequency
and Reduce device counts
2017 IEEE
19 AT17-19
Novel Approach Employing Buck-Boost
Converter as DC-Link Modulator and Inverter as
AC-Chopper for Induction Motor Drive
Applications: An Alternative to Conventional AC-
DC-AC Scheme
2017 IEEE
20 AT17-20 PWAM Controlled Quasi-Z Source Motor Drive 2017 IEEE
21 AT17-21
Simulation and Control of Solar Wind Hybrid
Renewable Power System 2017 IEEE
22 AT17-22
Improved Dynamic Performance of Shunt Active
Power Filter Using Particle Swarm Optimization 2017 IEEE
23 AT17-23
Particle Swarm Optimization Based Shunt Active
Harmonic Filter for Harmonic Compensation 2017 IEEE
24 AT17-24
Design and Performance Analysis of Three-Phase
Solar PV Integrated UPQC 2017 IEEE
25 AT17-25
Improved Fault Ride Through Capability in DFIG
Based Wind Turbines Using Dynamic Voltage
Restorer With Combined Feed-Forward and Feed-
Back Control
2017 IEEE
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26 AT17-26
Design and Evaluation of a Mini-Size SMES
Magnet for Hybrid Energy Storage Application in
a kW-Class Dynamic Voltage Restorer
2017 IEEE
27 AT17-27
A Filterless Single-Phase AC-AC Converter Based
on Coupled Inductors with Safe-Commutation
Strategy and Continuous Input Current 2017 IEEE
28 AT17-28
Novel Back EMF Zero Difference Point Detection
Based Sensorless Technique for BLDC Motor 2017 IEEE
29 AT17-29
A Novel DVR-ESS-embedded wind energy
conversion system
2017 IEEE
30 AT17-30
Dynamic Voltage Conditioner, a New Concept for
Smart Low-Voltage Distribution System
2017 IEEE
31 AT17-31
Transformer-less dynamic voltage restorer based
on buck-boost converter 2017 IEEE
7. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
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1 AT16-01
A Generation of Higher Number of Voltage
Levels by stacking inverters of lower multilevel
structure with low voltage devices for drives
2016 IEEE
2 AT16-02
A Novel Multilevel Multi-Output Bidirectional
Active Buck PFC Rectifier 2016 IEEE
3 AT16-03
Optimal Pulse width Modulation of Medium-
Voltage Modular Multilevel Converter 2016 IEEE
4 AT16-04
Novel Family of Single-Phase Modified
Impedance-Source Buck-Boost Multilevel
Inverters with Reduced Switch Count
2016 IEEE
5 AT16-05
Adaptive Neuro Fuzzy Inference System Least
Mean Square Based Control Algorithm for
DSTATCOM
2016 IEEE
6 AT16-06
An Islanding Detection Method for Inverter-
Based Distributed Generators Based on the
Reactive Power Disturbance
2016 IEEE
7 AT16-07
Quasi-Z-Source Inverter With a T-
TypeConverter in Normal and Failure Mode 2016 IEEE
8 AT16-08
Real-Time Implementation of Model Predictive
Control on 7-Level Packed U-Cell Inverter 2016 IEEE
9 AT16-09
High frequency inverter topologies integrated
with the coupled inductor bridge arm 2016 IET
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10 AT16-10
Dynamic voltage restorer employing multilevel
cascaded H-bridge inverter 2016 IET
11 AT16-11
Active power compensation method for single-
phase current source rectifier without extra active
switches
2016 IET
12 AT16-12
Cascaded multilevel inverter using series
connection of novel capacitor-based units with
minimum switch count
2016 IET
13 AT16-13
Design and Implementation of a Novel
Multilevel DC-AC Inverter 2016 IEEE
14 AT16-14
A New Cascaded Switched-Capacitor Multilevel
Inverter Based on Improved Series-Parallel
Conversion with Less Number of Components
2016 IEEE
15 AT16-15
Circulating current derivation and comprehensive
compensation of cascaded STATCOM under
asymmetrical voltage conditions
2016 IET
16 AT16-16
Design and implementation of a novel three-
phase cascaded half-bridge inverter 2016 IET
17 AT16-17
Grid connected three-phase multiple-pole
multilevel unity power factor rectifier with
reduce components count
2016 IET
18 AT16-18
Control of Ripple Eliminators to Improve the
Power Quality of DC Systems and Reduce the
Usage of Electrolytic Capacitors 2016 IEEE
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19 AT16-19
Design of External Inductor for Improving
Performance of Voltage Controlled DSTATCOM 2016 IEEE
20 AT16-20 An Enhanced Single Phase Step-Up Five-Level
Inverter
2016 IEEE
21 AT16-21
A Hybrid-STATCOM with Wide Compensation
Range and Low DC-Link Voltage 2016 IEEE
22 AT16-22
A Capacitor Voltage-Balancing Method for
Nested Neutral Point Clamped (NNPC) Inverter 2016 IEEE
23 AT16-23 T-type direct AC/AC converter structure 2016 IET
24 AT16-24
Modular Multilevel Converter Circulating
Current Reduction Using Model Predictive
Control
2016 IEEE
25 AT16-25
Parallel inductor multilevel current source
inverter with energy – recovery scheme for
inductor currents balancing
2016 IET
26 AT16-26
Open-Circuit Fault-Tolerant Control for
OuterSwitches of Three-Level Rectifiers in Wind
Turbine Systems
2016 IEEE
27 AT16-27
Enhancing DFIG wind turbine during three phase
fault using parallel interleaved converters and
dynamic resistor
2016 IET
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28 AT16-28
Load Model for Medium Voltage Cascaded
H-Bridge Multi-Level Inverter Drive Systems 2016 IEEE
29 AT16-29
Development and Comparison of an
ImprovedIncremental Conductance Algorithm for
Tracking the MPP of a Solar PV Panel
2016 IEEE
30 AT16-30
Impact of Switching Harmonics on Capacitor
CellsBalancing in Phase-Shifted PWM Based
Cascaded H-Bridge STATCOM
2016 IEEE
31 AT16-31
Effect of circulating current on input line current
of 12-pulse rectifier with active inter-phase
reactor
2016 IET
32 AT16-32
Modular Multilevel Converter-Based Bipolar
High-Voltage Pulse Generator With Sensorless
Capacitor Voltage Balancing Technique
2016 IEEE
33 AT16-33
Power-Electronics-Based Energy Management
System With Storage 2016 IEEE
34 AT16-34
Modulation and Control of Transformerless
UPFC 2016 IEEE
35 AT16-35 A Hybrid Simulation Model for VSC HVDC 2016 IEEE
36 AT16-36
Switching Control of Buck Converter Based on
Energy Conservation Principle 2016 IEEE
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37 AT16-37
A Three-Phase Multilevel HybridSwitched-
Capacitor PWM PFC Rectifier for High-Voltage-
Gain Applications
2016 IET
38 AT16-38
A dc-Side Sensorless Cascaded H-Bridge
Multilevel Converter Based PhotovoltaicSystem 2016 IEEE
39 AT16-39
Phase angle calculation dynamics of type-4wind
turbines in rms simulations during severe voltage
dips
2016 IET
40 AT16-40
A Multi-Level Converter with a Floating Bridge
for Open-Ended Winding Motor Drive
Applications
2016 IEEE
41 AT16-41
Model Predictive Control of Quasi-Z-
SourceFour-Leg Inverter 2016 IEEE
42 AT16-42
Using Multiple Reference Frame Theory for
Considering Harmonics in Average-Value
Modeling of Diode Rectifiers
2016 IEEE
43 AT16-43
Cascaded Dual Model Predictive Control of an
Active Front-End Rectifier 2016 IEEE
44 AT16-44
Simple Time Averaging Current Quality
Evaluation of a Single-Phase Multilevel PWM
Inverter
2016 IEEE
45 AT16-45
Nonlinear Control of Single-PhasePWM
Rectifiers With InherentCurrent-Limiting
Capability
2016 IET
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Impact of SFCL on the Four Types of HVDC
Circuit Breakers by Simulation 2016 IEEE
47 AT16-47
An Adaptive SPWM Technique for Cascaded
Multilevel Converters with Time-Variant DC
Sources
2016 IEEE
48 AT16-48
Model-Based Control for a Three-Phase
ShuntActive Power Filter 2016 IEEE
49 AT16-49
Design of a multi-level inverter with reactive
power control ability for connecting PV cells
to the grid
2016 IEEE
50 AT16-50
DSTATCOM supported induction generator
for improving power quality 2016 IET
51 AT16-51
Improved equal current approach for
reference current generation in shunt
applications underunbalanced and distorted
source and load conditions
2016 IET
52 AT16-52
A Hybrid-STATCOM With Wide
Compensation Range and Low DC-Link
Voltage
2016 IEEE
53 AT16-53
Design of External Inductor for Improving
Performance of Voltage-Controlled
DSTATCOM
2016 IEEE
54 AT16-54
Full-Bridge Reactive Power Compensator
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Application to Static Var Compensator
2016 IEEE
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A New Cascaded Switched-Capacitor
Multilevel Inverter Based on Improved
Series–Parallel Conversion With Less
Number of Components
2016 IEEE
56 AT16-56
Efficient Implicit Model Predictive Control of
Three Phase Inverter with an Output LC Filter 2016 IEEE
57 AT16-57
Single-stage Three-phase Differential-mode
Buck-Boost Inverters with Continuous Input
Current for PV Applications
2016 IEEE
58 AT16-58
Soft-start control strategy for the three phase
grid-connected inverter with LCL filter 2016 IEEE
59 AT16-59
High-Gain Single-Stage Boosting Inverter
For Photovoltaic Applications 2016 IET
60 AT16-60
Multilevel Inverter Topologies With Reduced
Device Count: A Review 2016 IEEE
61 AT16-61
Real time implementation of unity power
factor correction converter based on fuzzy
logic
2016 IEEE
62 AT16-62
Power Factor Correction in BLDC motor
Drives Using DC-DC Converters 2016 IEEE
63 AT16-63
Transformerless Single-Phase Universal
Active Filter With UPS Features and Reduced
Number of Electronic Power Switches 2016 IEEE
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64 AT16-64 PI tuning of Shunt Active Filter using GA and
PSO algorithm
2016 IEEE
65 AT16-65
PSO – PI Based DC Link Voltage Control
Technique for Shunt Hybrid Active
Power Filter
2016 IEEE
66 AT16-66 Artificial Neural Network based Three Phase
Shunt Active Power Filter
2016 IEEE
67 AT16-67
Cascaded open end winding transformer
based DVR 2016 IEEE
68 AT16-68
Brushless DC motor drive with power factor
regulation using Landsman converter 2016 IET
69 AT16-69
Comparative Analysis of 6, 12 and 48 Pulse
T-STATCOM 2016 ieee
70 AT16-70
A Superconducting Magnetic Energy
Storage- Emulator/Battery Supported
Dynamic Voltage Restorer
2016 IEEE
71 AT16-71
Compensation of Voltage Distribunces In
SMIB System Using ANN Based DPFC
Controller
2016 IEEE
72 AT16-72
Commutation Torque Ripple Reduction in
BLDC Motor Using Modified SEPIC
Converter and Three-level NPC Inverter
2016 IEEE
73 AT16-73
Novel Cascaded Switched-Diode Multilevel
Inverter for Renewable Energy Integration 2016 IEEE
74 AT16-74
A Highly Reliable Single-Phase High-
Frequency Isolated Double Step-Down AC-
AC Converter with Both Non-Inverting and
Inverting Operations
2016 IEEE
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75 AT16-75
Dynamic Voltage Restorer Using Switching
Cell Structured Multilevel AC-AC Converter 2016 IEEE
76 AT16-76
Time-Varying and Constant Switching
Frequency Based Sliding Mode Control
Methods for Transformerless DVR
Employing Half-Bridge VSI
2016 IEEE
77 AT16-77
Evaluation of DVR Capability Enhancement -
Zero Active Power Tracking Technique 2016 IEEE
78 AT16-78
Sensitive Load Voltage Compensation
Performed by a Suitable Control Method 2016 IEEE
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A High Gain Input-Parallel Output-Series
DC/DC Converter with Dual Coupled Inductors
2015 IEEE
2 AT15-02
A High Step-Up Converter with Voltage-
Multiplier Modules for Sustainable Energy
Applications
2015 IEEE
3 AT15-03
A High Step-Up DC to DC Converter Under
Alternating Phase Shift Control for Fuel Cell
Power System
2015 IEEE
4 AT15-04
High-Efficiency MOSFET Transformerless
Inverter for Non-isolated Microinverter
Applications
2015 IEEE
5 AT15-05
A Multi-Input Bridgeless Resonant AC-DC
Converter for Electromagnetic Energy
Harvesting
2015 IEEE
6 AT15-06
A Novel Control Method for Transformerless
H-Bridge Cascaded STATCOM with Star
Configuration
2015 IEEE
7 AT15-07
A Novel High Step-up DC/DC Converter Based
on Integrating Coupled Inductor and Switched-
Capacitor Techniques for Renewable Energy
Applications
2015 IEEE
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A Function Based Maximum Power Point
Tracking Method for Photovoltaic Systems 2015 IEEE
9 AT15-09
A Three-Phase Grid Tied SPV System With
Adaptive DC Link Voltage for CPI Voltage
Variations
2015 IEEE
10 AT15-10
Design of External Inductor for Improving
Performance of Voltage Controlled DSTATCOM 2015 IEEE
11 AT15-11
Grid-Connected PV Array with Supercapacitor
Energy Storage System for Fault Ride Through 2015 IEEE
12 AT15-12
Grid-Connected PV-Wind-Battery based Multi-
Input Transformer Coupled Bidirectional DC-DC
Converter for household Applications
2015 IEEE
13 AT15-13
MPPT with Single DC-DC Converter and
Inverter for Grid Connected Hybrid Wind-Driven
PMSG-PV System
2015 IEEE
14 AT15-14
Application of Neural Networks in Power
Quality 2015 IEEE
15 AT15-15
Neuro Fuzzy based controller for Power Quality
Improvement 2015 IEEE
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Single- and Two-Stage Inverter based grid
connected Photovoltaic Power Plants with Tide-
Through under Grid Faults
2015 IEEE
17 AT15-17
Power Quality Improvement of PMSG based DG
set feeding Three-phase loads 2015 IEEE
18 AT15-18
A Five Level Cascaded H-Bridge Multilevel
STATCOM 2015 IEEE
19 AT15-19
MPPT with Single DC–DC Converter and Inverter
for Grid-Connected Hybrid Wind-Driven PMSG–
PV System
2015 IEEE
20 AT15-20
Versatile Unified Power Quality Conditioner
Applied to Three-Phase Four-Wire Distribution
Systems Using a Dual Control Strategy 2015 IEEE
21 AT15-21
A Novel Five-Level Voltage Source Inverter With
Sinusoidal Pulse Width Modulator for Medium-
Voltage Applications 2015 IEEE
22 AT15-22
Development and Comparison of an Improved
Incremental Conductance Algorithm for Tracking
the MPP of a Solar PV Panel 2015 IEEE
23 AT15-23
A Single DC Source Cascaded Seven-Level
Inverter Integrating Switched Capacitor
Techniques 2015 IEEE
19. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
asokatechnologies@gmail.com Website: http://www.asokatechnologies.in
0-9347143789/9949240245
S NO CODE PROJECT TITLE YEAR JOURNAL
24 AT15-24
Improving the Performance of Cascaded H-bridge
based Interline Dynamic Voltage Restorer 2015 IEEE
25 AT15-25
Integrated Photovoltaic and Dynamic Voltage
Restorer System Configuration 2015 IEEE
26 AT15-26
Multilevel Cascaded-Type Dynamic Voltage
Restorer with Fault Current Limiting Function 2015 IEEE
27 AT15-27
Dynamic Voltage Restorer Based on Three-Phase
Inverters Cascaded Through an Open-End
Winding Transformer
2015 IEEE
28 AT15-28
Design Considerations of a Fault Current Limiting
Dynamic Voltage Restorer (FCL-DVR) 2015 IEEE
20. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
asokatechnologies@gmail.com Website: http://www.asokatechnologies.in
0-9347143789/9949240245
S NO CODE PROJECT TITLE YEAR JOURNAL
1 AT14-01
A Modified Three-Phase Four-Wire UPQC
TopologyWith Reduced DC-Link Voltage
Rating
2013-14 IEEE
2 AT14-02
FPGA-Based Predictive Sliding Mode Controller
of a Three-Phase Inverter 2013-14 IEEE
3 AT14-03
Pulsewidth Modulation of Z-Source Inverters
With Minimum Inductor Current Ripple 2014-15 IEEE
4 AT14-04
Improving the Dynamics of Virtual-Flux-Based
Control of Three-Phase Active Rectifiers 2014-15 IEEE
5 AT14-05
Sensorless Induction Motor Drive Using Indirect
Vector Controller and Sliding-Mode Observer for
Electric Vehicles
2013-14 IEEE
6 AT14-06
Back-Propagation Control Algorithm for Power
Quality Improvement Using DSTATCOM 2014-15 IEEE
7 AT14-07 A Zero-Voltage Switching Three-Phase Inverter 2014-15 IEEE
8 AT14-08
Control of Reduced-Rating Dynamic Voltage
Restorer With a Battery Energy Storage System 2014-15 IEEE
9 AT14-09
A Combination of Shunt Hybrid Power Filter
and Thyristor-Controlled Reactorfor Power
Quality
2014-15 IEEE
21. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
asokatechnologies@gmail.com Website: http://www.asokatechnologies.in
0-9347143789/9949240245
S NO CODE PROJECT TITLE YEAR JOURNAL
10 AT14-10
A Transformerless Grid-Connected Photovoltaic
System Based on the Coupled Inductor Single-
Stage Boost Three-Phase Inverter
2014-15 IEEE
11 AT14-11
LCL Filter Design and Performance Analysis for
Grid-Interconnected Systems 2014-15 IEEE
12 AT14-12
An Inductively Active Filtering Method for
Power-Quality Improvement of Distribution
Networks With Nonlinear Loads
2013-14 IEEE
13 AT14-13
A Bidirectional-Switch-Based Wide-Input Range
High-Efficiency Isolated Resonant Converter for
Photovoltaic Applications
2014-15 IEEE
14 AT14-14
Analysis and Implementation of an Improved
FlybackInverter for Photovoltaic AC Module
Applications
2014-15 IEEE
15 AT14-15
Speed Sensorless Vector Controlled Induction
Motor Drive Using Single Current Sensor 2013-14 IEEE
16 AT14-16
A Novel Design and Optimization Method of an
LCL Filter for a Shunt Active Power Filter 2014-15 IEEE
17 AT14-17
An Active Harmonic Filter Based onOne-Cycle
Control 2014-15 IEEE
22. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
asokatechnologies@gmail.com Website: http://www.asokatechnologies.in
0-9347143789/9949240245
S NO CODE PROJECT TITLE YEAR JOURNAL
18 AT14-18
A Nine-Level Grid-Connected Converter
Topologyfor Single-Phase Transformerless PV
Systems
2014-15 IEEE
19 AT14-19
Modeling and Design of Voltage Support Control
Schemes for Three-Phase Inverters Operating
UnderUnbalanced Grid Conditions
2014-15 IEEE
20 AT14-20
Cascaded Two-Level Inverter-Based Multilevel
STATCOM for High-Power Applications 2014-15 IEEE
21 AT14-21
A Voltage-Controlled DSTATCOM
for Power-Quality Improvement 2014-15 IEEE
22 AT14-22
Solar PV and Battery Storage Integration using
a New Configuration of a Three-Level NPC
Inverter With Advanced Control Strategy
2014-15 IEEE
23 AT14-23
A Current Control MPPT Method in High Power
Solar Energy Conversion System 2014-15 IEEE
24 AT14-24 A Novel Five-Level Inverter for Solar System 2014-15 IEEE
25 AT14-25
A Single-Stage Three-Phase Grid-Connected
Photo-Voltaic System With Fractional Order
MPPT
2014-15 IEEE
23. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
asokatechnologies@gmail.com Website: http://www.asokatechnologies.in
0-9347143789/9949240245
S NO CODE PROJECT TITLE YEAR JOURNAL
26 AT14-26
Design and Implementation of Sliding Mode and
PI Controllersbased Control for Three Phase
Shunt Active Power Filter
2014-15 IEEE
27 AT14-27
Implementation of Adaptive Filter in Distribution
Static Compensator 2014-15 IEEE
28 AT14-28
A Comparison of Soft-Switched DC-to-DC
Converters for Electrolyzer Application 2014-15 IEEE
29 AT14-29
Adaptive fuzzy controller based MPPT for
photovoltaic systems 2014-15 IEEE
30 AT14-30
Design of Fuzzy Logic Based Maximum Power
Point Tracking Controller for Solar Array for
Cloudy Weather Conditions.
2014-15 IEEE
31 AT14-31
Dynamic Behavior of DFIG Wind Turbine Under
Grid Fault Conditions 2014-15 IEEE
32 AT14-32
Fuzzy-Logic-Controller-Based SEPIC Converter
for Maximum Power Point Tracking 2014-15 IEEE
33 AT14-33
Performance Improvement of Direct Power
Control of PWM Rectifier With Simple
Calculation
2014-15 IEEE
24. ELECTRICAL PROJECTS USING MATLAB/SIMULINK
asokatechnologies@gmail.com Website: http://www.asokatechnologies.in
0-9347143789/9949240245
S NO CODE PROJECT TITLE YEAR JOURNAL
34 AT14-34
FLC-Based DTC Scheme to Improve the
Dynamic Performance of an IM Drive 2014-15 IEEE
35 AT14-35
Single Phase Grid-Connected Photovoltaic
Inverterfor Residential Application with
Maximum PowerPoint Tracking
2014-15 IEEE
36 AT14-36
Improved Active Power Filter Performance
for Renewable Power Generation Systems 2014-15 IEEE
37 AT14-37
Micro Wind Power Generator with Battery
Energy Storage for Critical Load 2014-15 IEEE
38 AT14-38
Power Conditioning in Distribution Systems
Using ANN Controlled Shunt Hybrid Active
Power Filter
2014 IEEE
39 AT14-39
Power Quality Improvement Using UPQC
Integrated with Distributed Generation Network 2014 IEEE