ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR ...Asoka Technologies
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.
SAI PROCORP PROVIDING BEST SOLUTIONS AND SERVICE ON MATLAB AND VLSI ESPECIALLY. WE RELEASED 2014 LIST FOR EEE STUDENTS WHO ARE INTERESTED TO DO INNOVATIVE PROJECTS. PLEASE SHARE THIS AND GET KNOWLEDGE.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Novel High Performance Stand Alone Solar PV System with High Gain, High Effic...Asoka Technologies
This paper proposes a novel 3- stand-alone solar PV system configuration that uses high gain, high efficiency (96%) dc-dc converters both in the forward power stage as well as the bidirectional battery interface. The high voltage gain converters enable the use of low voltage PV and battery sources. This results in minimization of partial shading and parasitic capacitance effects on the PV source. Series connection of a large number of battery modules is obviated, preventing the overcharging and deep discharging issues that reduce the battery life. Also, the proposed configuration facilitates "required power tracking (RPT)" of the PV source as per the load requirements eliminating the use of expensive and 'difficult to manage' dump loads. High performance inverter operation is achieved through abc to dq reference frame transformation, which helps in generating precise information about the load's active power component for RPT, regulation of ac output voltage and minimization of control complexity. Inverter output voltage is regulated by controlling the modulation index of sinusoidal pulse width modulation, resulting in a stable and reliable system operation. The active power demand is controlled by regulating the dc link voltage. All the analytical, simulation and experimental results of this work are presented.
Design and Performance Analysis of Three-Phase Solar PV Integrated UPQCAsoka Technologies
This paper deals with the design and performance analysis of a three-phase single stage solar photovoltaic integrated unified power quality conditioner (PV-UPQC). The PV-UPQC consists of a shunt and series connected voltage compensators connected back to back with common DC-link.The shunt compensator performs the dual function of extracting power from PV array apart from compensating for load current harmonics. An improved synchronous reference frame control based on moving average filter is used for extraction of load active current component for improved performance of the PVUPQC. The series compensator compensates for the grid side power quality problems such as grid voltage sags/swells. The compensator injects voltage in-phase/out of phase with point of common coupling (PCC) voltage during sag and swell conditions respectively. The proposed system combines both the benefits of clean energy generation along with improving power quality. The steady state and dynamic performance of the system are evaluated by simulating in Matlab-Simulink under a nonlinear load. The system performance is then verified using a scaled down laboratory prototype under a number of disturbances such as load unbalancing, PCC voltage sags/swells and irradiation variation.
ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR ...Asoka Technologies
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.
SAI PROCORP PROVIDING BEST SOLUTIONS AND SERVICE ON MATLAB AND VLSI ESPECIALLY. WE RELEASED 2014 LIST FOR EEE STUDENTS WHO ARE INTERESTED TO DO INNOVATIVE PROJECTS. PLEASE SHARE THIS AND GET KNOWLEDGE.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Novel High Performance Stand Alone Solar PV System with High Gain, High Effic...Asoka Technologies
This paper proposes a novel 3- stand-alone solar PV system configuration that uses high gain, high efficiency (96%) dc-dc converters both in the forward power stage as well as the bidirectional battery interface. The high voltage gain converters enable the use of low voltage PV and battery sources. This results in minimization of partial shading and parasitic capacitance effects on the PV source. Series connection of a large number of battery modules is obviated, preventing the overcharging and deep discharging issues that reduce the battery life. Also, the proposed configuration facilitates "required power tracking (RPT)" of the PV source as per the load requirements eliminating the use of expensive and 'difficult to manage' dump loads. High performance inverter operation is achieved through abc to dq reference frame transformation, which helps in generating precise information about the load's active power component for RPT, regulation of ac output voltage and minimization of control complexity. Inverter output voltage is regulated by controlling the modulation index of sinusoidal pulse width modulation, resulting in a stable and reliable system operation. The active power demand is controlled by regulating the dc link voltage. All the analytical, simulation and experimental results of this work are presented.
Design and Performance Analysis of Three-Phase Solar PV Integrated UPQCAsoka Technologies
This paper deals with the design and performance analysis of a three-phase single stage solar photovoltaic integrated unified power quality conditioner (PV-UPQC). The PV-UPQC consists of a shunt and series connected voltage compensators connected back to back with common DC-link.The shunt compensator performs the dual function of extracting power from PV array apart from compensating for load current harmonics. An improved synchronous reference frame control based on moving average filter is used for extraction of load active current component for improved performance of the PVUPQC. The series compensator compensates for the grid side power quality problems such as grid voltage sags/swells. The compensator injects voltage in-phase/out of phase with point of common coupling (PCC) voltage during sag and swell conditions respectively. The proposed system combines both the benefits of clean energy generation along with improving power quality. The steady state and dynamic performance of the system are evaluated by simulating in Matlab-Simulink under a nonlinear load. The system performance is then verified using a scaled down laboratory prototype under a number of disturbances such as load unbalancing, PCC voltage sags/swells and irradiation variation.
Inverter Design using PV System Boost ConverterIJMTST Journal
Many types of renewable energy, such as photovoltaic (PV), wind, tidal, and geothermal energy, have attracted a lot of attention over the past decade. Among these natural resources, the PV energy is a main and appropriate renewable energy for low-voltage dc-distribution systems, owing to the merits of clean, quiet, pollution free, and abundant. In the dc-distribution applications, a power system, including renewable distributed generators (DGS), dc loads (lighting, air conditioner, and electric vehicle), and a bidirectional inverter, is shown in fig. 1,in which two PV arrays with two maximum power point trackers (MPPTS) are implemented. However, the I–V characteristics of the PV arrays are nonlinear, and they require MPPTS to draw the maximum power from each PV array. Moreover, the bidirectional inverter has to fulfill grid connection (sell power) and rectification (buy power)with power-factor correction (PFC) to control the power flow between dc bus and ac grid,and to regulate the dc bus to a certain range of voltages, such as 380± 10 v.
Design and Analysis of Three Phase Inverter with Two Buck/Boost MPPTs for DC ...IJERA Editor
Anintegration and operation of a three-phase inverter with twobuck/boost maximum power point trackers
(MPPTs) for dc-distribution applications. In a dc-distribution system, a three phase inverter isrequired to control
the power flow between dc busand three phase ac grid, and to regulate the dc bus to a certainrange of voltages.
A droop regulation mechanism according to the inverter inductor current levels to reduce capacitor size, balance
power flow, and accommodate load variation is proposed. Since thephotovoltaic (PV) array voltage can vary
from 0 to 5000 V, especially with thin-film PV panels, the MPPT topology is formed with buck and boost
converters to operate at the dc-bus voltage around 4000 V, reducing the voltage stress of its followed inverter.
Additionally, the controller can online check the input configuration of the two MPPTs, equally distribute the
PV-array output current to the two MPPTs in parallel operation, and switch control laws to smooth out mode
transition. A comparison between the conventional boost MPPT and the proposed buck/boost MPPT integrated
with a PV inverter is also presented. Asingle-phase bidirectional inverter with two buck/boost maximum power
point trackers (MPPTs) by using the closed loop circuit. This project is workout bySimulink using mat lab.
A Survey on the Performance of the Various MPPT Techniques of Standalone PV G...IJSRD
Maximum Power Point Tracking (MPPT) controller is very important part of the solar generation system. This paper presents the basic need and the various methods and techniques of maximum power tracking (MPPT) control. Every technique of MPPT control is evaluated based on its ability to detect multiple maxima, efficiency of the output solar power, cost and way of implementation, rate of convergence etc. the Perturbation and Observation technique and Incremental conductance Technique are widely used in MPPT control due to their advantages.
Power Factor Improvement in Distribution System using DSTATCOM Based on Unit ...RSIS International
Power factor plays important role in the function of
the power system network. Hence, the power factor
improvement will increase the performance of power system
equipments. This paper presents the design and implementation
of distribution static compensator (DSTATCOM) with the stardelta
transformer for improvement of the power factor in threephase
four wire distribution system in the presence of threephase
linear load in the events of single phase, two-phase and
three phase trippings. The unit vector template method based
control algorithm has been implemented for the control of the
proposed DSTATCOM. The proposed test model has been
simulated in SIMULINK/MATLAB environment. The
simulations results show the effectiveness of proposed algorithm
Integrated energy management converter based on maximum power point tracking...IJECEIAES
This paper presents an integrated power control system for photovoltaic systems based on maximum power point tracking (MPPT). The architecture presented in this paper is designed to extract more power from photovoltaic panels under different partial obscuring conditions. To control the MPPT block, the integrated system used the ripple correlation control algorithm (RCC), as well as a high-efficiency synchronous direct current (DC-DC) boost power converter. Using 180 nm complementary metal-oxidesemiconductor (CMOS) technology, the proposed MPPT was designed, simulated, and layout in virtuoso cadence. The system is attached to a twocell in series that generates a 5.2 V average output voltage, 656.6 mA average output current, and power efficiency of 95%. The final design occupies only 1.68 mm2 .
Power Quality Improvement in a Grid connected pv systemVijayMuni2
In this case, the network voltage has the symmetric voltage
sag and voltage swell with 30% of the voltage drop from
0.51 to 0.54 and 30% of the voltage swell from 0.54 to 0.57.
Fig. 9 shows the simulation results for symmetric Voltage
sag and voltage swell. To show the better performance of
the proposed method, the voltage difference between the
desired voltage, network voltage, and load voltage has been
investigated. In Fig. 10, the results of the proposed controller
method and the PWM switching method are compared to
prove the efciency of the proposed controller method.
STATCOM compensates for symmetrical voltage swell and
voltage sag with the PWM switching method, but the steady-
state voltage difference is greater than STATCOM with the
proposed control.
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Novel Direct Switching Power Control Method of UPFC by Using Matrix Converte...IJMER
This paper presents a direct Switching power control for three-phase matrix converters
operating as unified power flow controllers (UPFCs). Matrix converters (MCs) allow the direct ac/ac
power conversion without dc energy storage links; therefore, the MC-based UPFC (MC-UPFC) has
reduced volume and cost, reduced capacitor power losses, together with higher reliability. Theoretical
principles of direct Switching power control based on sliding mode control techniques are established
for an MC-UPFC dynamic model including the input filter. As a result, line active and reactive power,
together with ac supply reactive power, can be directly controlled by selecting an appropriate matrix
converter switching state guaranteeing good steady-state and dynamic responses. Experimental results
of DSPC controllers for MC-UPFC show decoupled active and reactive power control, zero steady-state
tracking error, and fast response times. Compared to an MC-UPFC using active and reactive power
linear controllers based on a modified Venturing high-frequency PWM modulator, the experimental
results of the advanced DSPC-MC guarantee faster responses without overshoot and no steady state
error, presenting no cross-coupling in dynamic and steady-state responses
Similar to Development and operational control of two string maximum power point trackers in dc distribution systems (20)
Novel Direct Switching Power Control Method of UPFC by Using Matrix Converte...
Development and operational control of two string maximum power point trackers in dc distribution systems
1. DEVELOPMENT AND OPERATIONAL CONTROL OF TWO-STRING
MAXIMUM POWER POINT TRACKERS IN DC DISTRIBUTION SYSTEMS
ABSTRACT:
This paper develops the operational control of two maximum power point trackers (MPPTs) for twostring photovoltaic (PV) panels in dc distribution systems. This dc distribution system is connected to ac
grid via a bidirectional inverter. Two PV strings and two MPPTs are implemented in this system. The
proposed MPPT topology consists of buck and boost converters to deal with wide output voltage range of
PV panels. To accurately determine the input current of MPPTs, the PV-string configuration check is
accomplished online. The perturbation and observation method are applied for maximum power point
tracking. Moreover, the current balancing of two MPPT modules in parallel is achieved. In this paper, the
system configuration and the operational principle of the proposed MPPT are first introduced. Afterward,
the perturbation and observation method and the mode transition are demonstrated. Flowcharts of the online
PV-string configuration check and current balancing are explained. The validity of configuration check and
current balancing is verified via the experimental results. Maximum power tracking performance and power
conversion efficiency are also obtained.