Selective Harmonics Elimination Technique in Single Phase Unipolar H-Bridge Inverter
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Specific odd harmonics can be mitigated by operating the semiconductor switches in H-bridge inverters at optimized switching angles of the PWM signals. These switching angles can be achieved by deriving a number of nonlinear equations using Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) method. Modulation index (m) is a significant parameter used to control the amplitude of the fundamental output voltage of DC-AC inverter. By changing the value of modulation index the Total Harmonics Distortion (THD) also will change. In this paper, the performance of single phase full-bridge inverter using SHE-PWM scheme with varying the modulation index is evaluated. In order to achieve a minimum THD, a different number of nonlinear equations are used to calculate the switching angles. The performance of a single phase unipolar inverter is simulated in Matlab.
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Also, the fundamental voltage of the inverter is maximized by variation of modulation index
with switching angles optimized.
REFERENCES:
[1]. Ashok, B., & Rajendran, A. (2013). Selective Harmonic Elimination of Multilevel Inverter
Using SHEPWM Technique. International Journal of Soft Computing and Engineering (IJSCE),
3(2), 79–82.
[2]. Basri, A. B., Zaidi, N. A., Bopi, N. B., Aboadla, E. H., Khan, S., & Habaebi, M. H. (2016).
EFFECTS OF SWITCHING FREQUENCY TO SERIES LOADED SERIES RESONANT
CIRCUIT. ARPN Journal of Engineering and Applied Sciences, 11(1), 382–386.
[3]. Dahidah, M. S. A., & Agelidis, V. G. (2007). Non-symmetrical selective harmonic
elimination PWM techniques: The unipolar waveform. PESC Record - IEEE Annual Power
Electronics Specialists Conference, 1885–1891.
[4]. Edpuganti, K. (2015). Fundamental Switching Frequency Optimal Pulse width Modulation
of Medium-Voltage Nine-Level Inverter. IEEE TRANSACTIONS ON INDUSTRIAL
ELECTRONICS, 62(7), 4096– 4104.
[5]. Ghalib, M. A., & Abdalla, Y. S. (2014). Design and Implementation of a Pure Sine Wave
Single Phase Inverter for Photovoltaic Applications. AMERRICAN SOCIETY FOR
ENGINEERING EDUCATION, ASEE, 1– 8.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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This paper presents a novel dynamic voltage restorer (DVR) capable of handling deep sags including outage on a low voltage distribution system. The DVR recovers sags up to 10% of nominal voltage; otherwise, it will operate as an uninterruptible power supply (UPS). A transformer is connected in series with the load when restoring sags, and is reconfigured into parallel connection using switches when handling outages. The controller uses a Fuzzy Logic with 3 inputs to maintain the load voltage through d-q transformation. Preliminary results from laboratory tests are also presented in this paper.
Adaptive Hysteresis Band Current Control for Transformer-less Single-Phase PV...
Current control based on hysteresis algorithms are widely used in different applications, such as motion control, active filtering or active/reactive power delivery control in distributed generation systems. The hysteresis current control provides to the system a fast and robust dynamic response, and requires a simple implementation in standard digital signal platforms. On the other hand, the main drawback of classical hysteresis current control lies in the fact that the switching
frequency is variable, as the hysteresis band is fixed. In this paper a variable band hysteresis control algorithm will be presented. As it will be shown, this variable band permits overcoming the aforementioned problem giving rise to an almost constant switching frequency. The performance of this algorithm, together with classical hysteresis controls and proportional resonant (PR) controllers, has been evaluated in three different single-phase PV inverter topologies, by means of simulations performed with PSIM. In addition, the behavior of the thermal losses when using each control structure in such converters has been studied as well.
Novel Zero-Current Switching Current-Fed Half-Bridge Isolated Dc/Dc Converter...
This document describes a novel zero-current switching current-fed half-bridge isolated DC/DC converter that provides a simple solution for switching turn-off with zero-current switching without increasing component count. This reduces size, lowers cost, and improves efficiency. The document includes an abstract, keywords, block diagrams of the proposed and conventional converters, expected simulation results and figures, and references. It is presented as a potential topology for front-end DC/DC power conversion for fuel cell inverters.
A Variable DC Link based Novel Multilevel Inverter Topology for Low Voltage A...
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 New Family of Step-up Hybrid Switched- Capacitor Integrated Multilevel Inve...
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...
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.
Unknown input observer for a novel sensorless drive of brushless dc motors
In this paper, a novel motor control method is proposed to improve the performance of sensorless drive of BLDC motors. In the terminal voltage sensing method, which is a great portion of sensorless control, a precise rotor position cannot be obtained when excessive input is applied to the drive during synchronous operation mode. Especially in the transient state, the response characteristic decreases. To cope with this problem, the unknown input (back-EMF) is modelled as the additional state of system in this paper. Taking into account the disturbance adopted by the back-EMF, the observer can be obtained by an equation of the augmented system. An algorithm to detect the back-EMF of a BLDC motor using the state observer is constructed. As a result, a novel sensorless drive of BLDC motors that can strictly estimate rotor position and speed is proposed.
FPGA-Based Multi-Level Approximate Multipliers for High-Performance Error-Res...
FPGA-Based Multi-Level Approximate Multipliers for High-Performance Error-Res...AishwaryaRavishankar8
FPGA is a huge upcoming area of electronics engineering. This file is based on a research paper published in IEEE explore.40620130101003
This document summarizes a journal article that proposes a fuzzy logic approach for sensorless vector control of an induction motor using an efficiency optimization technique. It presents the following:
1) A dynamic model and state space model of the induction motor in a synchronous reference frame for vector control without sensors.
2) A fuzzy logic based online efficiency optimization controller that interfaces with the drive system to minimize power consumption.
3) The controller decrements the flux in steps until the measured input power is minimized. Membership functions and rules for the fuzzy controller are provided.
4) Performance of the drive is analyzed with and without the fuzzy controller using MATLAB/Simulink simulations. The fuzzy approach is found to improve efficiency
A Highly Efficient and Reliable Inverter Configuration Based Cascaded Multi-L...
This document presents a proposed improved cascaded multi-level inverter configuration for photovoltaic systems that aims to minimize leakage current. The proposed topology reduces switch count and has lower switching and conduction losses compared to existing designs. It also aims to reduce high-frequency voltage transitions in the terminal and common-mode voltages to minimize leakage current and reduce the size of EMI filters. Simulation results validating the performance of the proposed five-level inverter configuration are presented along with an analysis and comparison with other topologies.
Enhanced generalized vector control strategy for torque ripple mitigation of ...
Optimal currents with appropriate harmonic components injected into the motor windings can effectively mitigate torque ripple for interior permanent magnet (IPM) type brushless DC motors (BLDCMs). However, existing approaches may fail to accurately inject the optimal currents into motors due to the limited current loop bandwidth. This paper proposes a simple enhanced
Power quality improvement in distribution network using DSTATCOM with battery...
The distribution static compensator (DSTATCOM) provides fast control of active and reactive powers to enable load compensation, harmonics current elimination, voltage flicker mitigation, voltage and frequency regulation. This paper presents power quality improvement technique in the presence of grid disturbances and wind energy penetration using DSTATCOM with battery energy storage system. DSTATCOM control is provided based on synchronous reference frame theory. A modified IEEE 13 bus test feeder with DSTATCOM and wind generator is used for the study. Power quality events during grid disturbances such as feeder tripping and re-closing, voltage sag, swell and load switching have been studied in association with DSTATCOM. The power quality disturbances due to wind generator outage, synchronization and wind speed variations have also been investigated. The study has been carried out using MATLAB/SIMULINK and the simulation results are compared with real time results obtained by the use of real time digital simulator (RTDS) for validating the effectiveness of proposed methodology. The proposed method has been proved to be effective in improvement of power quality with all disturbances stated above.
Comparative study of graph partitioning algorithms
The document summarizes a study comparing the Kernighan-Lin (KL) and Simulated Annealing (SA) graph partitioning algorithms. The study evaluated the algorithms based on estimated network area, execution time, and cost function on various benchmark circuits. For smaller circuits, there was little difference between the algorithms. However, for larger circuits with more nodes, KL produced better results with lower execution times and cost function values compared to SA. The KL algorithm was found to produce the best overall results.
Ga based selective harmonic minimization of a 11 level
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
A generalized multilevel inverter topology with reduction of total standing v...
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, he 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.
Design and Analysis of 4-2 Compressor for Arithmetic Application
Design and Analysis of 4-2 Compressor for Arithmetic ApplicationAssociate Professor in VSB Coimbatore
Imprecise computing is an attractive model for digital processing at nano metric scales. Inexact computing is particularly interesting for computer arithmetic designs. This work deals about the design and analysis of two new inaccurate 4-2 compressors for utilization in a multiplier. These designs rely on different features of compression, such that imprecision in computation is measured by the error rate and the so-called normalized error distance can meet with respect to circuit-based figures of merit of a design in terms of number of transistors, delay and power consumption. The proposed approximate compressors are proposed and analyzed in Dadda multiplier. Extensive simulation results are provided and an application of the approximate multipliers to image processing is presented. The results proposed designs shows that reduced power dissipation, delay and transistor count.implementation and comparision of effective area efficient architecture for CSLA
This document presents a modified carry select adder (CSLA) architecture to improve efficiency over a regular CSLA. The modified design replaces one of the ripple carry adders in the CSLA with a binary-excess-1 converter to reduce the number of gates. Simulation results show the modified 16-bit CSLA has fewer gates and offers advantages of lower area, power and complexity compared to a regular CSLA design. The modified architecture provides an efficient alternative for low area and low power VLSI implementations.
Analytical model of the half bridge series resonant inverter for improved pow...
This paper presents an analytical model of a half-bridge series resonant inverter topology that is aimed at improving the design, control, and efficiency of resonant power converters. The model provides closed-form expressions of the main converter waveforms, output power, and efficiency, enabling fast design-space exploration and advanced control techniques to significantly improve converter operation. The analytical expressions were applied and verified in a half-bridge series resonant inverter for induction heating applications, proving the accuracy and effectiveness of the proposed model.
What's hot (19)
Thermal Stresses Relief Carrier-Based PWM Strategy for Single Phase Multileve...
Thermal Stresses Relief Carrier-Based PWM Strategy for Single Phase Multileve...
A Novel Dynamic Voltage Restorer with Outage Handling Capability Using Fuzzy ...
A Novel Dynamic Voltage Restorer with Outage Handling Capability Using Fuzzy ...
Adaptive Hysteresis Band Current Control for Transformer-less Single-Phase PV...
Adaptive Hysteresis Band Current Control for Transformer-less Single-Phase PV...
Novel Zero-Current Switching Current-Fed Half-Bridge Isolated Dc/Dc Converter...
Novel Zero-Current Switching Current-Fed Half-Bridge Isolated Dc/Dc Converter...
A Variable DC Link based Novel Multilevel Inverter Topology for Low Voltage A...
A Variable DC Link based Novel Multilevel Inverter Topology for Low Voltage A...
A New Family of Step-up Hybrid Switched- Capacitor Integrated Multilevel Inve...
A New Family of Step-up Hybrid Switched- Capacitor Integrated Multilevel Inve...
A multi cell 21-level hybrid multilevel inverter synthesizes a reduced number...
A multi cell 21-level hybrid multilevel inverter synthesizes a reduced number...
Unknown input observer for a novel sensorless drive of brushless dc motors
Unknown input observer for a novel sensorless drive of brushless dc motors
FPGA-Based Multi-Level Approximate Multipliers for High-Performance Error-Res...
FPGA-Based Multi-Level Approximate Multipliers for High-Performance Error-Res...
A Highly Efficient and Reliable Inverter Configuration Based Cascaded Multi-L...
A Highly Efficient and Reliable Inverter Configuration Based Cascaded Multi-L...
Enhanced generalized vector control strategy for torque ripple mitigation of ...
Enhanced generalized vector control strategy for torque ripple mitigation of ...
Power quality improvement in distribution network using DSTATCOM with battery...
Power quality improvement in distribution network using DSTATCOM with battery...
Comparative study of graph partitioning algorithms
Comparative study of graph partitioning algorithms
Ga based selective harmonic minimization of a 11 level
Ga based selective harmonic minimization of a 11 level
A generalized multilevel inverter topology with reduction of total standing v...
A generalized multilevel inverter topology with reduction of total standing v...
Design and Analysis of 4-2 Compressor for Arithmetic Application
Design and Analysis of 4-2 Compressor for Arithmetic Application
implementation and comparision of effective area efficient architecture for CSLA
implementation and comparision of effective area efficient architecture for CSLA
Analytical model of the half bridge series resonant inverter for improved pow...
Analytical model of the half bridge series resonant inverter for improved pow...
Similar to Selective Harmonics Elimination Technique in Single Phase Unipolar H-Bridge Inverter
Ei35761766
This document presents research on using a genetic algorithm to optimize switching angles in multilevel inverters in order to reduce total harmonic distortion. Specifically:
1) A genetic algorithm is developed and used to determine optimal switching angles for 7-level and 9-level cascaded inverters to eliminate low order harmonics and minimize total harmonic distortion, without needing to solve nonlinear equations.
2) Simulation results show the genetic algorithm approach produces switching angles that generate voltage waveforms with very low 5th, 7th, and 11th harmonics for the 9-level inverter and low 5th and 7th harmonics for the 7-level inverter.
3) The 9-level inverter achieves
A novel optimization harmonic elimination technique for cascaded multilevel i...
This document presents a novel optimization harmonic elimination technique (OHET) for cascaded multilevel inverters. The technique aims to minimize total harmonic distortion (THD) in the output voltage waveform. It utilizes selective harmonic elimination (SHE) to calculate switching angles that eliminate specific low-order odd harmonics. Modulation index and duty cycle are varied to further optimize the solution. Simulation results for a seven-level cascaded inverter show that OHET can reduce THD from 11.49% to 10.43% by adjusting the duty cycle and delaying the switching angles. The technique provides a two-step approach to further mitigate harmonics beyond conventional SHE.
Comparison of Modulation Techniques for Matrix Converter
Matrix Converters can directly convert an ac power supply of fixed voltage into an ac voltage of variable amplitude and frequency. Matrix Converter is a single stage converter. The matrix converters can contribute to the realization of low volume, sinusoidal input current, bidirectional power flow and lack of bulky reactive elements. All the reasons lead to the development of matrix converter. Based on the control techniques used in the matrix converter, the performance varies. So this paper analyses the performance of matrix converter with three different modulation techniques such as PWM, SVPWM and SVM. The basic principle and switching sequence of these modulation techniques are presented in this paper. The output voltage, output current waveforms, voltage transfer ratio and THD spectrum of switching waveforms connected to RL load are analyzed by using Matlab/Simulink software. The simulated results are analyzed and show that the THD is better for SVM technique.
ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR ...
It is known from the fact that Harmonic Distortion is one of the main power quality problems frequently encountered by the utilities. The harmonic problems in the power supply are caused by the non-linear characteristic based loads. The presence of harmonics leads to transformer heating, electromagnetic interference and solid state device mal-functioning. Hence keeping in view of the above concern, research has been carried out to mitigate harmonics. This paper presents an analysis and control methods for hybrid active power filter using Discrete Pulse Width Modulation and Space Vector Pulse Width Modulation (SVPWM) for Power Conditioning in distribution systems. The Discrete PWM has the function of voltage stability, and harmonic suppression. The reference current can be calculated by ‘d-q’ transformation. In SVPWM technique, the Active Power Filter (APF) reference voltage vector is generated instead of the reference current, and the desired APF output voltage is generated by SVPWM. The THD will be decreased significantly by SVPWM technique than the Discrete PWM technique based Hybrid filters. Simulations are carried out for the two approaches by using MATLAB, it is observed that the %THD has been improved from 1.79 to 1.61 by the SVPWM technique.
Combination Analysis and Switching Method of a Cascaded H-Bridge Multilevel I...
This paper analyzes the combination in a cascaded H-bridge multilevel inverter (CHBI) based on transformers with the different turn ratios for increasing the voltage level and proposes the switching method for achieving the output voltage distribution among H-bridge cells (HBCs). The transformers used in this paper are connected to the output of the respective HBCs, and the secondary sides of all the transformers are connected in series for generating the final output voltage. Only one of the transformers, in particular, has a different turn ratio for increasing the output voltage level. In this paper, the possible turn ratio of the special transformer with a different turn ratio is discussed in detail, and a switching method based on the level-shifted switching method for the topology used in this paper is proposed. To verify the effectiveness of the proposed method, a three-phase 21-level CHBI is experimentally tested.
Front end buck rectifier with reduced filter size and single-loop control
This paper presents a transformerless solution for front-end rectification, which is particularly suitable for traction applications, requiring high voltages to be stepped down to appropriate dc voltage. The proposed topology is based on pulse widthmodulation buck rectifier (current source inverter topology) and is capable of rectification and stepping down of single-phase ac supply, in a single stage. A new control scheme is proposed to achieve constant dc output voltage and sinusoidal source current, irrespective of large ripples in the dc inductor current. The proposed scheme is configured in single-loop voltage control mode. The relevant small-signal model is derived from the large-signal model using multi order decomposition. An elaborate procedure of dc filter design is discussed, for circuit operation with minimum energy storage. All analytical results are validated by numerical simulation for sinusoidal and distorted source voltage. Experimental verification is achieved through a 1.2-kW grid-connected laboratory prototype.
An integrated boost resonant converter for photovoltaic applications
Effective photovoltaic power conditioning requires efficient power conversion and accurate maximum power point tracking to counteract the effects of panel mismatch, shading, and general variance in power output during a daily cycle. In this paper, the authors propose an integrated boost resonant converter with low component count, galvanic isolation, simple control, as well as
high efficiency across a wide input and load range. Provided is a discussion of the converter synthesis, key operational features, converter design procedure, and loss analysis, as well as experimental verification by way of a 250-W prototype with a California Energy Commission efficiency of 96.8%.
Design and hardware implementation considerations of modified multilevel casc...
This document discusses a study of modified cascaded multilevel H-bridge inverters for photovoltaic systems. It explores a 5-level inverter configuration using 6 switches instead of 8, reducing cost and complexity. The inverter is driven by level shifted in-phase disposition pulse width modulation to reduce harmonics. Simulation and hardware results show the effectiveness of the proposed design in improving efficiency over traditional designs while maintaining output power quality.
Modified phase shifted pwm scheme for reliability improvement in cascaded h-b...
The cascaded H-bridge multilevel inverter (CHMI) is a modular structure that consists of many
power semiconductor switches. With this increase in the number of power semiconductor switches, it is hard to predict and handle the failure of the devices, and hence reliability of CHMI decreases. The major cause of power semiconductor switch failure is junction temperature that is produced by power losses. The study proposes a multi-carrier pulse-width modulation (PWM) scheme for reduction in switching losses of CHMI. In the proposed modulation scheme, the two legs conduct switching operation at different frequencies for switching reduction. One leg conducts switching operation with high frequency, while the other leg conducts switching operation with fundamental frequency. The switching operations with different frequencies cause
unbalanced switching loss to each leg. Therefore, the junction temperature that is based on power losses leads to different life-times for the power semiconductor switch. Additionally, the switching frequency of the two legs is alternated to evenly distribute switching losses and junction temperature. Simulation and experimental results verify the performance of the proposed PWM scheme.
A Novel Hybrid Negative Half Cycle Biased Modulation Scheme for Cascaded Mult...
This paper proposes a new Modified hybrid modulation scheme for cascaded multilevel inverter. The proposed method employs novel single carrier sinusoidal pulse width modulation with its negative cycle biased (HNHCBM) for reducing switching losses when compared to other sinusoidal modulation methods using a hybrid scheme. This scheme is a derivative of various single carrier sinusoidal pulse width modulation scheme and main advantages are reduced harmonics, enhanced output voltage, reduced power loss in the series cells and ease of implementation. The simulation results are analysed with matlab/simulink and compared with experimental results obtained using 5-level inverter and the results are summarized.
Power quality enhancement in residential smart grids through power factor cor...
The proliferation of non-linear loads and the increasing penetration of Distributed Energy Resources (DER) in Medium-Voltage (MV) and Low-Voltage (LV) distribution grids, make it more difficult to maintain the power quality levels in residential electrical grids, especially in the case of weak grids. Most household appliances contain a conventional Power Factor Corrector (PFC) rectifier, which maximizes the load Power Factor (PF) but does not contribute to the regulation of the voltage Total Harmonic Distortion (THDV ) in residential electrical grids. This manuscript proposes a modification for PFC controllers by adapting the operation mode depending on the measured THDV . As a result, the PFCs operate either in a low current Total Harmonic Distortion (THDI ) mode or in the conventional resistor emulator mode and contribute to the regulation of the THDV and the PF at the distribution feeders. To prove the concept, the modification is applied to a current sensorless Non-Linear Controller (NLC) applied to a single-phase Boost rectifier. Experimental results show its performance in a PFC front-end stage operating in Continuous Conduction Mode (CCM) connected to the grid with different THDV .
Irradiance-adaptive PV Module Integrated Converter for High Efficiency and Po...
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.
40120140505013
This document describes a digitized feedback loop for a DC-DC buck converter operating at 400kHz. A digital signal controller (dsPIC) is used to monitor the output voltage and provide PID control of the converter by modifying the pulse width of the digital PWM signal. Simulation results in Matlab/Simulink matched well with experimental results. The dsPIC implementation provided an efficient yet low-cost solution compared to using a DSP for digital control of the converter.
Power Quality Improvement of Grid-Connected Photovoltaic Systems Using Trans-...
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.
Nine-level Asymmetrical Single Phase Multilevel Inverter Topology with Low sw...
This paper presents a new asymmetrical singlephase multilevel inverter topology capable of producing ninelevel output voltage with reduce device counts. In order to obtain the desired output voltage, dc sources are connected in all the combination of addition and subtraction through different switches. Proposed topology results in reduction of dc source, switch counts, losses, cost and size of the inverter. Comparison between the existing topologies shows that the proposed topology yields less component counts. Proposed topology is modeled and simulated using Matlab-Simulink software in order to verify the performance and feasibility of the circuit. A low frequency switching strategy is also proposed in this work. The results show that the proposed topology is capable to produce a nine-level output voltage with less number of component counts and acceptable harmonic distortion content.
N1102018691
This document summarizes a research paper on minimizing total harmonic distortion (THD) in a three-phase, five-level cascaded H-bridge inverter. It first describes the configuration and operation of a cascaded H-bridge multilevel inverter. It then reviews the generalized formulation of selective harmonic elimination (SHE) for multilevel inverters. The document presents a MATLAB/Simulink model of a three-phase, five-level inverter that compares sinusoidal pulse width modulation to SHE for harmonic reduction. Simulation results show that SHE reduces THD from 71.2% to 4.66% by eliminating specific lower-order harmonics through optimization of the switching angles.
Variable Frequency Digital PWM Control for Low-Power Buck Converters
Variable Frequency Digital PWM Control for Low-Power Buck ConvertersAssociation of Scientists, Developers and Faculties
This paper describes digital pulse width modulation (DPWM) controller technique for implementing low-power buck converters. The converter is operated at Discontinuous conduction mode to reduce the losses during switching. A DPWM controller is developed to achieve the best possible transient performance under load current change. Simulation of the converter is carried out using MATLAB/SIMULINK and the results indicate that it has good dynamic performance under load change.Single phase ac ac buck-boost converter with single-phase matrix topology
This paper deals with a new family of single-phase AC/AC buck-boost converter based on singlephase matrix topology. The proposed converter provides a wider range of output AC voltage in which the output voltage can be bucked and in-phase/out-of-phase with the input voltage; and the output voltage can be boosted and in-phase/out-of-phase with the input voltage. A commutation strategy is employed to realize snubberless operation. The operating principles, circuit analysis and experimental results based on TMS320F2812 DSP are presented.
Performance Analysis of H-bridge and T-Bridge Multilevel Inverters for Harmon...
Performance Analysis of H-bridge and T-Bridge Multilevel Inverters for Harmon...International Journal of Power Electronics and Drive Systems
This paper deals with the design of cascaded 11 level H- bridge inverter. It includes a comparison between the 11 level H-bridge and T-bridge multilevel inverter. The cascaded inverter of higher level is a very effective and practical solution for reduction of total harmonic distortion (THD).These cascaded multilevel inverter can be used for higher voltage applications with more stability. As the level is increased the output waveform becomes more sinusoidal in nature. The inverter is designed using multicarrier sinusoidal pulse width modulation technique for generating triggering pulses for the semiconductor switches used in the device. Through this paper it will be proved that a cascaded multilevel H-bridge topology has higher efficiency than a T-bridge inverter, as whichever source input voltage is provided since input is equal to the output voltage. In T-bridge inverter, the output obtained is half of the applied input, so efficiency is just half as compared to H-bridge. The output waveform is distorted and has higher THD. The simulation is performed using MATLAB /Simulink 2013 software.Single-phase hybrid cascaded H-bridge and diode-clamped multilevel inverter w...
Diode-clamped and cascaded H-bridge multilevel inverters are two of the main multilevel inverter topologies; each has its distinct advantages and drawbacks. Regarding the latter, cascaded H-bridge inverters require multiple separate dc sources, whereas (semi-active) diode-clamped inverters contain capacitors that require a means to balance their voltages. This paper investigates a hybrid-topology inverter, comprising a single-phase five-level semi-active diode-clamped inverter and a single-phase cascaded H-bridge inverter with their outputs connected in series, as one way to mitigate the drawbacks of each topology. The proposed control scheme for this inverter operates the switches at fundamental frequency to achieve capacitor voltage-balancing while keeping the switching losses low. Moreover, the step-angles are designed for the 13-level and 11-level output voltage waveform cases (as examples) for a fixed modulation index to achieve optimal total harmonic distortion. Furthermore, the scheme also achieves capacitor voltage-balancing for modulation indices that are close to the optimal modulation index, and for a wide range of load power factors, albeit at the cost of increased output voltage distortion. Simulation results are presented to help explain the processes of capacitor recharging and voltage-balancing, while experimental results are shown as verification of the expected behavior of this invert er and the proposed control scheme.
Similar to Selective Harmonics Elimination Technique in Single Phase Unipolar H-Bridge Inverter (20)
A novel optimization harmonic elimination technique for cascaded multilevel i...
A novel optimization harmonic elimination technique for cascaded multilevel i...
Comparison of Modulation Techniques for Matrix Converter
Comparison of Modulation Techniques for Matrix Converter
ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR ...
ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR ...
Combination Analysis and Switching Method of a Cascaded H-Bridge Multilevel I...
Combination Analysis and Switching Method of a Cascaded H-Bridge Multilevel I...
Front end buck rectifier with reduced filter size and single-loop control
Front end buck rectifier with reduced filter size and single-loop control
An integrated boost resonant converter for photovoltaic applications
An integrated boost resonant converter for photovoltaic applications
Design and hardware implementation considerations of modified multilevel casc...
Design and hardware implementation considerations of modified multilevel casc...
Modified phase shifted pwm scheme for reliability improvement in cascaded h-b...
Modified phase shifted pwm scheme for reliability improvement in cascaded h-b...
A Novel Hybrid Negative Half Cycle Biased Modulation Scheme for Cascaded Mult...
A Novel Hybrid Negative Half Cycle Biased Modulation Scheme for Cascaded Mult...
Power quality enhancement in residential smart grids through power factor cor...
Power quality enhancement in residential smart grids through power factor cor...
Irradiance-adaptive PV Module Integrated Converter for High Efficiency and Po...
Irradiance-adaptive PV Module Integrated Converter for High Efficiency and Po...
Power Quality Improvement of Grid-Connected Photovoltaic Systems Using Trans-...
Power Quality Improvement of Grid-Connected Photovoltaic Systems Using Trans-...
Nine-level Asymmetrical Single Phase Multilevel Inverter Topology with Low sw...
Nine-level Asymmetrical Single Phase Multilevel Inverter Topology with Low sw...
Variable Frequency Digital PWM Control for Low-Power Buck Converters
Variable Frequency Digital PWM Control for Low-Power Buck Converters
Single phase ac ac buck-boost converter with single-phase matrix topology
Single phase ac ac buck-boost converter with single-phase matrix topology
Performance Analysis of H-bridge and T-Bridge Multilevel Inverters for Harmon...
Performance Analysis of H-bridge and T-Bridge Multilevel Inverters for Harmon...
Single-phase hybrid cascaded H-bridge and diode-clamped multilevel inverter w...
Single-phase hybrid cascaded H-bridge and diode-clamped multilevel inverter w...
More from Asoka Technologies
Solar pv charging station for electric vehicles
This document describes a project to design and simulate a solar photovoltaic charging station for electric vehicles using MATLAB/Simulink. The charging station employs a multi-port design to provide constant voltage DC power from the solar panels to charge vehicle batteries using a constant current/constant voltage method. The performance of the charging system is validated through simulation and experimental results. The conclusion discusses opportunities to enhance such systems through optimization techniques, energy storage, intelligent controllers, and hybrid designs incorporating multiple renewable energy sources.
Generation of Higher Number of Voltage Levels by Stacking Inverters of Lower ...
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...
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 generalized multilevel inverter topology with reduction of total standing v...
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...
This document discusses a project to improve power quality in a solar photovoltaic energy conversion system using a cascaded 15-level inverter. Proportional Integral, Artificial Neural Network, and Fuzzy Logic controllers are investigated to eliminate harmonics. Simulations were performed in MATLAB/Simulink and hardware was demonstrated for a 3kWp photovoltaic plant coupled to a multilevel inverter. The fuzzy logic controller provided the best results for voltage regulation and power quality improvement. Experimental results validated the effectiveness of the proposed system for grid interaction while improving power quality.
Residential Community Load Management based on Optimal Design of Standalone H...
This document presents a study on designing a standalone hybrid renewable energy system (HRES) for a residential community in Pakistan using PV, wind, diesel, and battery. Nine system configurations were analyzed using HOMER software to determine the optimal and most economical design. HOMER results showed a PV-wind-battery system with 13.4 kW PV, 4 kW wind, and 20 battery units was optimal, with a net present cost of $28,620 and cost of energy of $0.311/kWh. MATLAB/Simulink modeling validated this design could maintain voltages and safe battery SOC while meeting load, even with generation and demand fluctuations. The HRES design and control strategy presented provides a tool for planning
Reliability evaluation of MPPT based interleaved boost converter for PV system
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 optimisation scheme of induction motor using FLC for electric vehicle
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...
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 uipc
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 control
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...
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.
Intelligent Power Sharing of DC Isolated Microgrid Based on Fuzzy Sliding Mod...
The document describes a novel droop control strategy for accurate power sharing in an isolated DC microgrid considering uncertainties and disturbances. It proposes using a sliding mode controller based on a Takagi-Sugeno fuzzy model to represent the nonlinear droop characteristics. The control strategy compensates for uncertainties and disturbances to achieve accurate proportional load power sharing without communication. The method is verified through PSIM/Matlab simulation to regulate load changes and ensure system stability in the DC microgrid.
Implementation of solar pv battery and diesel generator based electric vehic...
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.
High step up quasi-z source dc-dc converter
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...
This document discusses a proposed Fuel Cell Integrated Unified Power Quality Conditioner (FCI-UPQC) system for improving power quality in a three-phase four-wire distribution grid. The FCI-UPQC uses a four-leg converter on the shunt side and three-leg converter on the series side. An adaptive neuro-fuzzy inference system controller is designed to maintain the DC link voltage. Simulation results in MATLAB/Simulink showed that the FCI-UPQC can effectively compensate for power quality issues like voltage sag, swell, harmonics, and neutral current imbalance. The inclusion of a fuel cell provides real power support during grid interruptions. The paper concludes that the proposed FCI-UPQC
Distributed incremental adaptive filter controlled grid interactive residenti...
This document describes a distributed incremental adaptive filter (DIAF) controlled utility interfaced photovoltaic (PV) - battery microgrid system that is presented with power quality features. The bidirectional controlled converter with a battery mitigates intermittency of a PV array under rapid weather variations. The DIAF control provides harmonics mitigation, load balancing and power factor improvement. It has been demonstrated that the DIAF based control of residential PV/battery microgrid system can continuously supply power by integrating battery backup with a PV array even during outages of the PV array and utility grid. Test results validated the control technique and power quality indices were within IEEE standards.
Development of wind and solar based ac microgrid with power quality improveme...
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 Control
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...
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.
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Generation of Higher Number of Voltage Levels by Stacking Inverters of Lower ...
Generation of Higher Number of Voltage Levels by Stacking Inverters of Lower ...
Novel symmetric modular hybrid multilevel inverter with reduced number of sem...
Novel symmetric modular hybrid multilevel inverter with reduced number of sem...
A generalized multilevel inverter topology with reduction of total standing v...
A generalized multilevel inverter topology with reduction of total standing v...
Power Quality Improvement in Solar Fed Cascaded Multilevel Inverter with Outp...
Power Quality Improvement in Solar Fed Cascaded Multilevel Inverter with Outp...
Residential Community Load Management based on Optimal Design of Standalone H...
Residential Community Load Management based on Optimal Design of Standalone H...
Reliability evaluation of MPPT based interleaved boost converter for PV system
Reliability evaluation of MPPT based interleaved boost converter for PV system
Power optimisation scheme of induction motor using FLC for electric vehicle
Power optimisation scheme of induction motor using FLC for electric vehicle
Power Flow Control of Interconnected AC-DC Microgrids in Grid-Connected Hybri...
Power Flow Control of Interconnected AC-DC Microgrids in Grid-Connected Hybri...
Power flow control of hybrid micro grids using modified uipc
Power flow control of hybrid micro grids using modified uipc
Multifunctional grid tied pv system using modified klms control
Multifunctional grid tied pv system using modified klms control
Modelling and voltage control of the solar wind hybrid micro-grid with optimi...
Modelling and voltage control of the solar wind hybrid micro-grid with optimi...
Intelligent Power Sharing of DC Isolated Microgrid Based on Fuzzy Sliding Mod...
Intelligent Power Sharing of DC Isolated Microgrid Based on Fuzzy Sliding Mod...
Implementation of solar pv battery and diesel generator based electric vehic...
Implementation of solar pv battery and diesel generator based electric vehic...
Fuel cell integrated unified power quality conditioner for voltage and curren...
Fuel cell integrated unified power quality conditioner for voltage and curren...
Distributed incremental adaptive filter controlled grid interactive residenti...
Distributed incremental adaptive filter controlled grid interactive residenti...
Development of wind and solar based ac microgrid with power quality improveme...
Development of wind and solar based ac microgrid with power quality improveme...
Application of Artificial Neural Networks for Shunt APF Control
Application of Artificial Neural Networks for Shunt APF Control
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Control strategy of pmsg based wind energy conversion system under strong win...
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An improved modulation technique suitable for a three level flying capacitor ...
This research paper introduces an innovative modulation technique for controlling a 3-level flying capacitor multilevel inverter (FCMLI), aiming to streamline the modulation process in contrast to conventional methods. The proposed
simplified modulation technique paves the way for more straightforward and
efficient control of multilevel inverters, enabling their widespread adoption and
integration into modern power electronic systems. Through the amalgamation of
sinusoidal pulse width modulation (SPWM) with a high-frequency square wave
pulse, this controlling technique attains energy equilibrium across the coupling
capacitor. The modulation scheme incorporates a simplified switching pattern
and a decreased count of voltage references, thereby simplifying the control
algorithm.
Embedded machine learning-based road conditions and driving behavior monitoring
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
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（详情请加一下 文凭顾问+微信:95270640）欢迎咨询！子小伍玩小伍比山娃小一岁虎头虎脑的很霸气父亲让山娃跟小伍去夏令营听课山娃很高兴夏令营就设在附近一所小学山娃发现那所小学比自己的学校更大更美操场上还铺有塑胶跑道呢里面很多小朋友一班一班的快快乐乐原来城里娃都藏这儿来了怪不得平时见不到他们山娃恍然大悟起来吹拉弹唱琴棋书画山娃都不懂却什么都想学山娃怨自己太笨什么都不会斟酌再三山娃终于选定了学美术当听说每月要交元时父亲犹豫了山娃也说爸算了吧咱学校一学期才转
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
官方认证美国密歇根州立大学毕业证学位证书原版一模一样
原版一模一样【微信：741003700 】【美国密歇根州立大学毕业证学位证书】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Unit-III-ELECTROCHEMICAL STORAGE DEVICES.ppt
Batteries -Introduction – Types of Batteries – discharging and charging of battery - characteristics of battery –battery rating- various tests on battery- – Primary battery: silver button cell- Secondary battery :Ni-Cd battery-modern battery: lithium ion battery-maintenance of batteries-choices of batteries for electric vehicle applications.
Fuel Cells: Introduction- importance and classification of fuel cells - description, principle, components, applications of fuel cells: H2-O2 fuel cell, alkaline fuel cell, molten carbonate fuel cell and direct methanol fuel cells.
Rainfall intensity duration frequency curve statistical analysis and modeling...
Using data from 41 years in Patna’ India’ the study’s goal is to analyze the trends of how often it rains on a weekly, seasonal, and annual basis (1981−2020). First, utilizing the intensity-duration-frequency (IDF) curve and the relationship by statistically analyzing rainfall’ the historical rainfall data set for Patna’ India’ during a 41 year period (1981−2020), was evaluated for its quality. Changes in the hydrologic cycle as a result of increased greenhouse gas emissions are expected to induce variations in the intensity, length, and frequency of precipitation events. One strategy to lessen vulnerability is to quantify probable changes and adapt to them. Techniques such as log-normal, normal, and Gumbel are used (EV-I). Distributions were created with durations of 1, 2, 3, 6, and 24 h and return times of 2, 5, 10, 25, and 100 years. There were also mathematical correlations discovered between rainfall and recurrence interval.
Findings: Based on findings, the Gumbel approach produced the highest intensity values, whereas the other approaches produced values that were close to each other. The data indicates that 461.9 mm of rain fell during the monsoon season’s 301st week. However, it was found that the 29th week had the greatest average rainfall, 92.6 mm. With 952.6 mm on average, the monsoon season saw the highest rainfall. Calculations revealed that the yearly rainfall averaged 1171.1 mm. Using Weibull’s method, the study was subsequently expanded to examine rainfall distribution at different recurrence intervals of 2, 5, 10, and 25 years. Rainfall and recurrence interval mathematical correlations were also developed. Further regression analysis revealed that short wave irrigation, wind direction, wind speed, pressure, relative humidity, and temperature all had a substantial influence on rainfall.
Originality and value: The results of the rainfall IDF curves can provide useful information to policymakers in making appropriate decisions in managing and minimizing floods in the study area.
Advanced control scheme of doubly fed induction generator for wind turbine us...
This paper describes a speed control device for generating electrical energy on an electricity network based on the doubly fed induction generator (DFIG) used for wind power conversion systems. At first, a double-fed induction generator model was constructed. A control law is formulated to govern the flow of energy between the stator of a DFIG and the energy network using three types of controllers: proportional integral (PI), sliding mode controller (SMC) and second order sliding mode controller (SOSMC). Their different results in terms of power reference tracking, reaction to unexpected speed fluctuations, sensitivity to perturbations, and resilience against machine parameter alterations are compared. MATLAB/Simulink was used to conduct the simulations for the preceding study. Multiple simulations have shown very satisfying results, and the investigations demonstrate the efficacy and power-enhancing capabilities of the suggested control system.
学校原版美国波士顿大学毕业证学历学位证书原版一模一样
原版一模一样【微信：741003700 】【美国波士顿大学毕业证学历学位证书】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
cnn.pptx Convolutional neural network used for image classication
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Mechanical Engineering on AAI Summer Training Report-003.pdf
Mechanical Engineering PROJECT REPORT ON SUMMER VOCATIONAL TRAINING
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22CYT12-Unit-V-E Waste and its Management.ppt
Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
Optimizing Gradle Builds - Gradle DPE Tour Berlin 2024
Sinan from the Delivery Hero mobile infrastructure engineering team shares a deep dive into performance acceleration with Gradle build cache optimizations. Sinan shares their journey into solving complex build-cache problems that affect Gradle builds. By understanding the challenges and solutions found in our journey, we aim to demonstrate the possibilities for faster builds. The case study reveals how overlapping outputs and cache misconfigurations led to significant increases in build times, especially as the project scaled up with numerous modules using Paparazzi tests. The journey from diagnosing to defeating cache issues offers invaluable lessons on maintaining cache integrity without sacrificing functionality.
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Selective Harmonics Elimination Technique in Single Phase Unipolar H-Bridge Inverter
- 1. ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Selective Harmonics Elimination Technique in Single Phase Unipolar H-Bridge Inverter ABSTRACT: Specific odd harmonics can be mitigated by operating the semiconductor switches in H-bridge inverters at optimized switching angles of the PWM signals. These switching angles can be achieved by deriving a number of nonlinear equations using Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) method. Modulation index (m) is a significant parameter used to control the amplitude of the fundamental output voltage of DC-AC inverter. By changing the value of modulation index the Total Harmonics Distortion (THD) also will change. In this paper, the performance of single phase full-bridge inverter using SHE-PWM scheme with varying the modulation index is evaluated. In order to achieve a minimum THD, a different number of nonlinear equations are used to calculate the switching angles. The performance of a single phase unipolar inverter is simulated in Matlab. KEYWORDS: 1. Selective Harmonic Elimination 2. H-bridge Inverter SOFTWARE: MATLAB/SIMULINK CONCLUSION: Matlab-Simulink is used to evaluate the proposed technique in order to mitigate 3th, 5th, 7th, 9th, 11th & 13th harmonics and to verify the influence of various condition of modulation index on THD in single-phase full-bridge H inverter. Low order odd harmonics can be mitigated successfully by using SHE-PWM also, by adjusting the switching angles the Total Harmonic Distortion is decreased to a minimum of 57.47%. These switching angles are applied to generate control signals of full-bridge H-inverter. By increasing the modulation index the THD decreased.
- 2. ELECTRICAL PROJECTS USING MATLAB/SIMULINK Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com, Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Also, the fundamental voltage of the inverter is maximized by variation of modulation index with switching angles optimized. REFERENCES: [1]. Ashok, B., & Rajendran, A. (2013). Selective Harmonic Elimination of Multilevel Inverter Using SHEPWM Technique. International Journal of Soft Computing and Engineering (IJSCE), 3(2), 79–82. [2]. Basri, A. B., Zaidi, N. A., Bopi, N. B., Aboadla, E. H., Khan, S., & Habaebi, M. H. (2016). EFFECTS OF SWITCHING FREQUENCY TO SERIES LOADED SERIES RESONANT CIRCUIT. ARPN Journal of Engineering and Applied Sciences, 11(1), 382–386. [3]. Dahidah, M. S. A., & Agelidis, V. G. (2007). Non-symmetrical selective harmonic elimination PWM techniques: The unipolar waveform. PESC Record - IEEE Annual Power Electronics Specialists Conference, 1885–1891. [4]. Edpuganti, K. (2015). Fundamental Switching Frequency Optimal Pulse width Modulation of Medium-Voltage Nine-Level Inverter. IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 62(7), 4096– 4104. [5]. Ghalib, M. A., & Abdalla, Y. S. (2014). Design and Implementation of a Pure Sine Wave Single Phase Inverter for Photovoltaic Applications. AMERRICAN SOCIETY FOR ENGINEERING EDUCATION, ASEE, 1– 8.