This document discusses improving power quality in a grid-integrated photovoltaic (PV) system. A PV system is connected to a grid-interfacing inverter along with both linear and non-linear loads. Hysteresis current control is used to generate switching pulses for the inverter to regulate power flow. Simulation results show that without inverter control, grid current is distorted and total harmonic distortion is high. With the proposed inverter control, current harmonics are reduced, reactive power demand is compensated, and total harmonic distortion is lowered from 17.03% to 5.43%. Therefore, the control approach improves power quality without additional hardware.
A CONTROL APPROACH FOR GRID INTERFACING INVERTER IN 3 PHASE 4 WIRE DISTRIBUT...IJMER
With the increase in load demand, the Renewable Energy Sources (RES) are
increasingly connected in the distribution systems which utilizes power electronic
Converters/Inverters. Nowadays, 3-phase 4-wire distribution power system has been widely used in
residential and office buildings, manufacturing facilities, schools etc This paper presents a novel
control strategy for achieving maximum benefits from the grid-interfacing inverters when installed in
3-phase 4-wire distribution systems. The inverter can thus be utilized as: 1) power converter to inject
power to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics and
load neutral current. All of these functions may be accomplished either individually or
simultaneously. This new control concept is demonstrated with extensive MATLAB/Simulink
simulation studies
Power-Quality Improvement Features In Grid Interconnection of Wind Energy Sou...AM Publications
The increased power demand, the depletion of the fossil fuel resources and the growth of the environmental pollution has led
the world to think seriously of other alternative sources of energy. So renewable energy resources (RES) are being connected to the
distribution systems, mostly done by using power electronic converters. A new control strategy for achieving maximum advantage from
these grid-interfacing inverters which are when installed in 3-phase 4-wire distribution systems is given in this paper. With the inverter
control, the inverter can be used as a multi-function device, which includes the function of: 1) power converter to inject power generated
from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and
load neutral current. These functions of the inverter can be done either individually or simultaneously. The proposed inverter with the
control when connected, helps the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appear as balanced
linear load to the grid. With MATLAB/Simulink simulation studies, the proposed control technique is demonstrated and evaluated here.
Power Quality Improvement of Grid Interconnection of renewable Energy Based D...IJERA Editor
This paper presents a grid interfacing inverter which compensates power quality problems and also interface Renewable Energy Sources with the help of electric grid. Renewable Energy Sources are being increasingly connected in distribution system utilizing power electronic converters. Grid interfacing inverter can be used: 1) To improve the transfer of active power harvested from RES; 2) To meet load reactive power demand support ; 3) To reduce current harmonics by incorporating the current harmonic compensator at point of common coupling(PCC) ; 4) current unbalance and neutral current compensation in case of 3-phase 4-wire system. The fuzzy logic can be used in many applications especially, when the process/models are complex to analyse by using classical methods. Mainly fuzzy logic controller is used to control DC capacitor voltage. Simulations are carried out using MATLAB/SIMULINK to verify the performance of the controller. The output shows the controller has fast dynamic response high accuracy of tracking DC voltage reference and robust to load parameters variations.
Enhancement in Power Quality With Grid Interconnection of Renewable Energy So...IJERA Editor
At present the Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as power converter to inject power generated from RES to the grid and shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control concept is demonstrated with extensive MATLAB/Simulink simulation studies and validated through digital signal processor-based laboratory experimental results.
Grid Interconnection of Renewable Energy Sources at the Distribution Level Wi...Pradeep Avanigadda
Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters.
This project presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems.
The inverter can thus be utilized as:
1) power converter to inject power generated from RES to the grid &
2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current.
A CONTROL APPROACH FOR GRID INTERFACING INVERTER IN 3 PHASE 4 WIRE DISTRIBUT...IJMER
With the increase in load demand, the Renewable Energy Sources (RES) are
increasingly connected in the distribution systems which utilizes power electronic
Converters/Inverters. Nowadays, 3-phase 4-wire distribution power system has been widely used in
residential and office buildings, manufacturing facilities, schools etc This paper presents a novel
control strategy for achieving maximum benefits from the grid-interfacing inverters when installed in
3-phase 4-wire distribution systems. The inverter can thus be utilized as: 1) power converter to inject
power to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics and
load neutral current. All of these functions may be accomplished either individually or
simultaneously. This new control concept is demonstrated with extensive MATLAB/Simulink
simulation studies
Power-Quality Improvement Features In Grid Interconnection of Wind Energy Sou...AM Publications
The increased power demand, the depletion of the fossil fuel resources and the growth of the environmental pollution has led
the world to think seriously of other alternative sources of energy. So renewable energy resources (RES) are being connected to the
distribution systems, mostly done by using power electronic converters. A new control strategy for achieving maximum advantage from
these grid-interfacing inverters which are when installed in 3-phase 4-wire distribution systems is given in this paper. With the inverter
control, the inverter can be used as a multi-function device, which includes the function of: 1) power converter to inject power generated
from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and
load neutral current. These functions of the inverter can be done either individually or simultaneously. The proposed inverter with the
control when connected, helps the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appear as balanced
linear load to the grid. With MATLAB/Simulink simulation studies, the proposed control technique is demonstrated and evaluated here.
Power Quality Improvement of Grid Interconnection of renewable Energy Based D...IJERA Editor
This paper presents a grid interfacing inverter which compensates power quality problems and also interface Renewable Energy Sources with the help of electric grid. Renewable Energy Sources are being increasingly connected in distribution system utilizing power electronic converters. Grid interfacing inverter can be used: 1) To improve the transfer of active power harvested from RES; 2) To meet load reactive power demand support ; 3) To reduce current harmonics by incorporating the current harmonic compensator at point of common coupling(PCC) ; 4) current unbalance and neutral current compensation in case of 3-phase 4-wire system. The fuzzy logic can be used in many applications especially, when the process/models are complex to analyse by using classical methods. Mainly fuzzy logic controller is used to control DC capacitor voltage. Simulations are carried out using MATLAB/SIMULINK to verify the performance of the controller. The output shows the controller has fast dynamic response high accuracy of tracking DC voltage reference and robust to load parameters variations.
Enhancement in Power Quality With Grid Interconnection of Renewable Energy So...IJERA Editor
At present the Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as power converter to inject power generated from RES to the grid and shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control concept is demonstrated with extensive MATLAB/Simulink simulation studies and validated through digital signal processor-based laboratory experimental results.
Grid Interconnection of Renewable Energy Sources at the Distribution Level Wi...Pradeep Avanigadda
Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters.
This project presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems.
The inverter can thus be utilized as:
1) power converter to inject power generated from RES to the grid &
2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Analysis of power quality improvement in grid connected wind driven induction...eSAT Journals
Abstract As a promising renewable alternative, the wind power is one of the significant sources of generation. Reactive power compensation and harmonic reduction in a low voltage distribution networks for integration of wind power to the grid are the main issues addressed in this paper. This paper proposes a control scheme based on instaneous Pq theory for compensating the reactive power requirement of a three phase grid connected wind driven induction generator as well as the harmonics produced by the non linear load connected to the PCC using STATCOM. The proposed control scheme is simulated using MATLAB/SIMULINK. The Simulation results are presented in this paper. Keywords- wind power, distribution network, induction generator, STATCOM, reactive power.
Comparative of Conventional and Intelligence Controller based Hybrid Generati...IJERD Editor
Harmonic pollution of the power supply system has risen significantly in recent years due primarily
to an increase of non-linear loads connected to the utility through residential, commercial and industrial
customers. This paper, proposed a solution to eliminate the harmonics introduced by the nonlinear loads in
steady and in transients. It presents a predictive current control strategy for achieving maximum benefits from
these grid-interfacing inverters implementing conventional DC link controller and intelligence controller, when
installed in 3-phase 4-leg voltage source inverter (VSI). The inverter is controlled to perform as a multi-function
device by incorporating active power filter functionality. The use of a four-leg voltage-source inverter allows
the compensation of current harmonic components, as well as unbalanced current generated by three-phase
nonlinear loads. Renewable energy resources (RES) are being increasingly connected in distribution systems
utilizing power electronic converters. The compensation performance of the proposed active power filter and the
associated hybrid PV/Wind system generation scheme with new control scheme is demonstrated to improve the
power quality features is simulated using MATLAB/SIMULINK.
This paper focus on distribution system by applying different control techniques in order to improve the performance of the system. In the distribution system mainly concentrate on power quality issues like reactive power control, harmonic elimination, power factor correction, etc. Because of power quality problems voltage, current, frequency are continuously changing in power systems. These changes will effects the performance of power systems. Power quality problems can be compensated by placing DSTATCOM which is connected at PCC in parallel. It is shunt connected VSI along with the filters, with the help of DSTATCOM voltage sag, swell and THD can be controlled. This paper presents detailed explanation about performance and configuration of latest control techniques to control the DSTATCOM.
Hybrid Green Energy Systems for Uninterrupted ElectrificationDr.NAGARAJAN. S
In this paper, a new multiport, hybrid green-fed DC-DC bidirectional converter is designed and fed into the standalone system. This model is developed and integrated to study the concept of generating systems. In this model, a PV panel of 300 watts is designed and integrated to a bidirectional converter with a battery backup to extract power, while the wind power is harnessed with a transformer coupled a dual-half-bridge converter. The model proposed is designed with a meritorious objective of sustainable, cost-effective, less component count reduced losses, and good efficiency with a good relia- bility. The system works day and night to produce output with good efficiency. The simulation results are obtained using MATLAB software 2014a, and hence, the performance is analyzed.
Application of PI controller based active filter for harmonic mitigation of g...journalBEEI
The recent trends show the interconnection of PV system with electric grid. With this configuration the issue of harmonics comes into existence. The mounting figure of power-electronic instruments has formed considerable impression on the power-quality of electric supply. Harmonics deformations have conventionally been handled amid the application of passive-LC filters. Active Filter has emerged as a good substitute for passive filters to reduce the harmonics to great extent as it has numerous benefits over the former filters. The active filter’s most vital part is the applied control strategies. Several researches are being under process to advance the functioning of the filter. One of the important control requirements of filter is the regulation of DC link up capacitor voltage. Here the voltage supervision of capacitor is being done using PI controller. The paper show current harmonics compensation of PV grid connected system using PI controller based active filter. Simulation outcomes have been shown which displays the harmonics are within the IEEE boundaries.
Advance Technology in Application of Four Leg Inverters to UPQCIJPEDS-IAES
This article presents a novel application of four leg inverter with
conventional Sinusoidal Pulse Width Modulation (SPWM) Scheme to
Unified Power Quality Conditioner (UPQC). The Power Quality problem
became burning issues since the starting of high voltage AC transmission
system. Hence, in this article it has been discussed to mitigate the PQ issues
in high voltage AC systems through a three phase Unified Power Quality
Conditioner (UPQC) under various conditions, such as harmonic mitigation
scheme, non linear loads, sag and swell conditions as well. Also, it proposes
to control harmoincs with various artificial intelligent techniques. Thus
application of these control technique such as Neural Networks (ANN)
Fuzzy Logic makes the system performance in par with the standards
and also compared with existing system. The simulation results based on
MATLAB/Simulink are discussed in detail to support the concept developed
in the paper.
This paper presents a droop control technique for equal power sharing in islanded microgrid. In this study, the proposed controller is based on the frequency droop method, is applied to a robust droop controller in parallel connected inverters. The previous robust droop controller deals with voltage droop method. A modification has been formed against this controller by adding a fuzzy logic controller with the frequency droop method. The only sharing error which is concentrated in this paper is the error in sharing the rated frequency among the inverters. By adapting fuzzy in the robust droop, it tries to eliminate the frequency error, hence that the frequency reference of the inverters keeps maintain at 50Hz. A derivation of generalized models of a single-phase parallel-connected inverter system is shown. The simulation results show that the proposed controller with FLC is able to improve the stability of frequency reference and the performance of power sharing between the inverters under the inductive line impedance.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Stability Improvement in Grid Connected Multi Area System using ANFIS Based S...IJMTST Journal
Generally, the non-conventional energy sources are being extensively used in case of power electronic
converter based distribution systems. This paper mainly focuses on the wind energy system integrating with
grid connected system and also improvement of power quality features. The wind energy power plant is
modelled based on associated equations. For improving this power quality problems, this paper proposes the
concepts of shunt converter controllers. This paper also proposes the concepts of ANFIS based Static
Compensator. And also the results are compared for this cases. Thus with such a control, a balanced load
currents are obtained even in the presence of non-linear load. The experimental setup is done in Matlab and
verified the simulation results
Improved Power Quality by using STATCOM Under Various Loading ConditionsIJMTST Journal
A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that
results in a failure or a mis-operation of end user equipment’s. Utility distribution networks, sensitive
industrial loads and critical commercial operations suffer from various types of outages and service
interruptions which can cost significant financial losses. With the restructuring of power systems and with
shifting trend towards distributed and dispersed generation, the issue of power quality is going to take
newer dimensions. Injection of the wind power into an electric grid affects the power quality. The
performance of the wind turbine and thereby power quality are determined on the basis of measurements
and the norms followed according to the guideline specified in International Electro-technical Commission
standard, IEC-61400. The influence of the wind turbine in the grid system concerning the power quality
measurements are-the active power, reactive power, variation of voltage, flicker, harmonics, and electrical
behavior of switching operation and these are measured according to national/international guidelines.
Static Compensator (STATCOM) is connected at a point of common coupling with a battery energy storage
system (BESS) to mitigate the power quality issues. The battery energy storage is integrated to sustain the
real power source under fluctuating wind power. Here two control schemes for STATCOM are Fuzzy logic
controller and hybrid Fuzzy logic controller. We can better response for hybrid fuzzy compare to fuzzy logic
controller. The STATCOM control scheme for the grid connected wind energy generation system for power
quality improvement is simulated using MATLAB/SIMULINK in power system block set. Finally the proposed
scheme is applied for both balanced and unbalanced linear nonlinear loads.
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
Improvement of Power Delivery Efficiency of 11KV Power Line using Power Capac...IJAEMSJORNAL
Optimal capacitor placement in the distribution network is the most popular technique adopted for the control of power loss and enhancement of Volts Ampere Reactive for effective power delivery. This study, therefore, discusses improvement of distribution efficiency of 11kV power lines through placement of capacitor banks in the network. Power flow in the network, Ado-Ekiti 11kV lines, was carried out using Newton-Rapson iteration method available in MATLAB while the analysis of the network was actualized using the conventional load flow equation modeling. From the analysis of the network, voltage deviation falls within the range of -5.9 to -180.5% which is completely outside the permissible range of ±5%. Voltage drop on the feeders is within the range (1.2 – 1.9) kV before and (0.2 – 0.7) kV after the reactive power of the network was compensated.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Hysteresis-based Voltage and Current Control Techniques for Grid Connected So...IJECEIAES
Solar PV system development and integration with existing grid is very fast in recent years all over the world, as they require limited maintenance, pollution free and simple structure. When observing the factors affecting the performance of the grid connected solar photovoltaic system, the inverter output voltage with harmonics add with the harmonics generated due to the non-linear loads, retain a bigger challenge to maintain power quality in the grid. To maintain grid power quality, better inverter control technique should be developed. This paper presents the two control techniques for grid-tied inverters. This study developed the hysteresis controller for the inverter. Hysteresis controller used in this work two way (i) Voltage control mode (ii) Current control mode. Matlab/Simulink model is developed for the proposed system. Further the study presents the comparative evaluation of the performance of both control techniques based on the percentage of total harmonic distortion (THD) with the limits specified by the standards such as IEEE 1547 and IEC 61727 and IEEE Std 519-2014.
Artificial neural network based unity power factor corrector for single phas...IJECEIAES
Due to the negative effects of the non-linear semiconductor devices and the passive electrical components (inductor and capacitor) in the converter circuits, and that are deteriorating the power factor (PF) and total harmonics distortion (THD) of grid current, this study proposes a novel unity PF correction controller based on a new algorithm of neural network to improve the performance of a single phase boost DC-DC converter with respect to the mentioned concerns. The controller guarantees stable load voltage. The PF corrector, firstly measures the phase shift between grid voltage and grid current waveforms, then through a new artificial neural network (ANN) algorithm, a suitable duty cycle is predicted to guide and control the converter to reduce the phase shift between grid voltage and grid current as possible to have maximum PF which is unity PF, and to improve the THD level of grid current. The proposed system is simulated and evaluated via Simulink of MATLAB, the simulation results are collected at constant duty cycle and at controlled duty cycle through the proposed PF controller using different loads. The presented PF controller guarantees the unity power factor, and enhances the grid alternating current THD.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Analysis of power quality improvement in grid connected wind driven induction...eSAT Journals
Abstract As a promising renewable alternative, the wind power is one of the significant sources of generation. Reactive power compensation and harmonic reduction in a low voltage distribution networks for integration of wind power to the grid are the main issues addressed in this paper. This paper proposes a control scheme based on instaneous Pq theory for compensating the reactive power requirement of a three phase grid connected wind driven induction generator as well as the harmonics produced by the non linear load connected to the PCC using STATCOM. The proposed control scheme is simulated using MATLAB/SIMULINK. The Simulation results are presented in this paper. Keywords- wind power, distribution network, induction generator, STATCOM, reactive power.
Comparative of Conventional and Intelligence Controller based Hybrid Generati...IJERD Editor
Harmonic pollution of the power supply system has risen significantly in recent years due primarily
to an increase of non-linear loads connected to the utility through residential, commercial and industrial
customers. This paper, proposed a solution to eliminate the harmonics introduced by the nonlinear loads in
steady and in transients. It presents a predictive current control strategy for achieving maximum benefits from
these grid-interfacing inverters implementing conventional DC link controller and intelligence controller, when
installed in 3-phase 4-leg voltage source inverter (VSI). The inverter is controlled to perform as a multi-function
device by incorporating active power filter functionality. The use of a four-leg voltage-source inverter allows
the compensation of current harmonic components, as well as unbalanced current generated by three-phase
nonlinear loads. Renewable energy resources (RES) are being increasingly connected in distribution systems
utilizing power electronic converters. The compensation performance of the proposed active power filter and the
associated hybrid PV/Wind system generation scheme with new control scheme is demonstrated to improve the
power quality features is simulated using MATLAB/SIMULINK.
This paper focus on distribution system by applying different control techniques in order to improve the performance of the system. In the distribution system mainly concentrate on power quality issues like reactive power control, harmonic elimination, power factor correction, etc. Because of power quality problems voltage, current, frequency are continuously changing in power systems. These changes will effects the performance of power systems. Power quality problems can be compensated by placing DSTATCOM which is connected at PCC in parallel. It is shunt connected VSI along with the filters, with the help of DSTATCOM voltage sag, swell and THD can be controlled. This paper presents detailed explanation about performance and configuration of latest control techniques to control the DSTATCOM.
Hybrid Green Energy Systems for Uninterrupted ElectrificationDr.NAGARAJAN. S
In this paper, a new multiport, hybrid green-fed DC-DC bidirectional converter is designed and fed into the standalone system. This model is developed and integrated to study the concept of generating systems. In this model, a PV panel of 300 watts is designed and integrated to a bidirectional converter with a battery backup to extract power, while the wind power is harnessed with a transformer coupled a dual-half-bridge converter. The model proposed is designed with a meritorious objective of sustainable, cost-effective, less component count reduced losses, and good efficiency with a good relia- bility. The system works day and night to produce output with good efficiency. The simulation results are obtained using MATLAB software 2014a, and hence, the performance is analyzed.
Application of PI controller based active filter for harmonic mitigation of g...journalBEEI
The recent trends show the interconnection of PV system with electric grid. With this configuration the issue of harmonics comes into existence. The mounting figure of power-electronic instruments has formed considerable impression on the power-quality of electric supply. Harmonics deformations have conventionally been handled amid the application of passive-LC filters. Active Filter has emerged as a good substitute for passive filters to reduce the harmonics to great extent as it has numerous benefits over the former filters. The active filter’s most vital part is the applied control strategies. Several researches are being under process to advance the functioning of the filter. One of the important control requirements of filter is the regulation of DC link up capacitor voltage. Here the voltage supervision of capacitor is being done using PI controller. The paper show current harmonics compensation of PV grid connected system using PI controller based active filter. Simulation outcomes have been shown which displays the harmonics are within the IEEE boundaries.
Advance Technology in Application of Four Leg Inverters to UPQCIJPEDS-IAES
This article presents a novel application of four leg inverter with
conventional Sinusoidal Pulse Width Modulation (SPWM) Scheme to
Unified Power Quality Conditioner (UPQC). The Power Quality problem
became burning issues since the starting of high voltage AC transmission
system. Hence, in this article it has been discussed to mitigate the PQ issues
in high voltage AC systems through a three phase Unified Power Quality
Conditioner (UPQC) under various conditions, such as harmonic mitigation
scheme, non linear loads, sag and swell conditions as well. Also, it proposes
to control harmoincs with various artificial intelligent techniques. Thus
application of these control technique such as Neural Networks (ANN)
Fuzzy Logic makes the system performance in par with the standards
and also compared with existing system. The simulation results based on
MATLAB/Simulink are discussed in detail to support the concept developed
in the paper.
This paper presents a droop control technique for equal power sharing in islanded microgrid. In this study, the proposed controller is based on the frequency droop method, is applied to a robust droop controller in parallel connected inverters. The previous robust droop controller deals with voltage droop method. A modification has been formed against this controller by adding a fuzzy logic controller with the frequency droop method. The only sharing error which is concentrated in this paper is the error in sharing the rated frequency among the inverters. By adapting fuzzy in the robust droop, it tries to eliminate the frequency error, hence that the frequency reference of the inverters keeps maintain at 50Hz. A derivation of generalized models of a single-phase parallel-connected inverter system is shown. The simulation results show that the proposed controller with FLC is able to improve the stability of frequency reference and the performance of power sharing between the inverters under the inductive line impedance.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Stability Improvement in Grid Connected Multi Area System using ANFIS Based S...IJMTST Journal
Generally, the non-conventional energy sources are being extensively used in case of power electronic
converter based distribution systems. This paper mainly focuses on the wind energy system integrating with
grid connected system and also improvement of power quality features. The wind energy power plant is
modelled based on associated equations. For improving this power quality problems, this paper proposes the
concepts of shunt converter controllers. This paper also proposes the concepts of ANFIS based Static
Compensator. And also the results are compared for this cases. Thus with such a control, a balanced load
currents are obtained even in the presence of non-linear load. The experimental setup is done in Matlab and
verified the simulation results
Improved Power Quality by using STATCOM Under Various Loading ConditionsIJMTST Journal
A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that
results in a failure or a mis-operation of end user equipment’s. Utility distribution networks, sensitive
industrial loads and critical commercial operations suffer from various types of outages and service
interruptions which can cost significant financial losses. With the restructuring of power systems and with
shifting trend towards distributed and dispersed generation, the issue of power quality is going to take
newer dimensions. Injection of the wind power into an electric grid affects the power quality. The
performance of the wind turbine and thereby power quality are determined on the basis of measurements
and the norms followed according to the guideline specified in International Electro-technical Commission
standard, IEC-61400. The influence of the wind turbine in the grid system concerning the power quality
measurements are-the active power, reactive power, variation of voltage, flicker, harmonics, and electrical
behavior of switching operation and these are measured according to national/international guidelines.
Static Compensator (STATCOM) is connected at a point of common coupling with a battery energy storage
system (BESS) to mitigate the power quality issues. The battery energy storage is integrated to sustain the
real power source under fluctuating wind power. Here two control schemes for STATCOM are Fuzzy logic
controller and hybrid Fuzzy logic controller. We can better response for hybrid fuzzy compare to fuzzy logic
controller. The STATCOM control scheme for the grid connected wind energy generation system for power
quality improvement is simulated using MATLAB/SIMULINK in power system block set. Finally the proposed
scheme is applied for both balanced and unbalanced linear nonlinear loads.
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
Improvement of Power Delivery Efficiency of 11KV Power Line using Power Capac...IJAEMSJORNAL
Optimal capacitor placement in the distribution network is the most popular technique adopted for the control of power loss and enhancement of Volts Ampere Reactive for effective power delivery. This study, therefore, discusses improvement of distribution efficiency of 11kV power lines through placement of capacitor banks in the network. Power flow in the network, Ado-Ekiti 11kV lines, was carried out using Newton-Rapson iteration method available in MATLAB while the analysis of the network was actualized using the conventional load flow equation modeling. From the analysis of the network, voltage deviation falls within the range of -5.9 to -180.5% which is completely outside the permissible range of ±5%. Voltage drop on the feeders is within the range (1.2 – 1.9) kV before and (0.2 – 0.7) kV after the reactive power of the network was compensated.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Hysteresis-based Voltage and Current Control Techniques for Grid Connected So...IJECEIAES
Solar PV system development and integration with existing grid is very fast in recent years all over the world, as they require limited maintenance, pollution free and simple structure. When observing the factors affecting the performance of the grid connected solar photovoltaic system, the inverter output voltage with harmonics add with the harmonics generated due to the non-linear loads, retain a bigger challenge to maintain power quality in the grid. To maintain grid power quality, better inverter control technique should be developed. This paper presents the two control techniques for grid-tied inverters. This study developed the hysteresis controller for the inverter. Hysteresis controller used in this work two way (i) Voltage control mode (ii) Current control mode. Matlab/Simulink model is developed for the proposed system. Further the study presents the comparative evaluation of the performance of both control techniques based on the percentage of total harmonic distortion (THD) with the limits specified by the standards such as IEEE 1547 and IEC 61727 and IEEE Std 519-2014.
Artificial neural network based unity power factor corrector for single phas...IJECEIAES
Due to the negative effects of the non-linear semiconductor devices and the passive electrical components (inductor and capacitor) in the converter circuits, and that are deteriorating the power factor (PF) and total harmonics distortion (THD) of grid current, this study proposes a novel unity PF correction controller based on a new algorithm of neural network to improve the performance of a single phase boost DC-DC converter with respect to the mentioned concerns. The controller guarantees stable load voltage. The PF corrector, firstly measures the phase shift between grid voltage and grid current waveforms, then through a new artificial neural network (ANN) algorithm, a suitable duty cycle is predicted to guide and control the converter to reduce the phase shift between grid voltage and grid current as possible to have maximum PF which is unity PF, and to improve the THD level of grid current. The proposed system is simulated and evaluated via Simulink of MATLAB, the simulation results are collected at constant duty cycle and at controlled duty cycle through the proposed PF controller using different loads. The presented PF controller guarantees the unity power factor, and enhances the grid alternating current THD.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Grid Interconnection of Renewable Energy Sources at the Distribution Level Wi...Pradeep Avanigadda
Renewable energy resources (RES) are being increasingly
connected in distribution systems utilizing power electronic
converters. This paper presents a novel control strategy for
achieving maximum benefits from these grid-interfacing inverters
when installed in 3-phase 4-wire distribution systems. The inverter
is controlled to perform as a multi-function device by incorporating
active power filter functionality. The inverter can thus be
utilized as: 1) power converter to inject power generated from
RES to the grid, and 2) shunt APF to compensate current unbalance,
load current harmonics, load reactive power demand and
load neutral current. All of these functions may be accomplished
either individually or simultaneously. With such a control, the
combination of grid-interfacing inverter and the 3-phase 4-wire
linear/non-linear unbalanced load at point of common coupling
appears as balanced linear load to the grid. This new control
concept is demonstrated with extensive MATLAB/Simulink simulation
studies and validated through digital signal processor-based
laboratory experimental results.
Index Terms—Active power filter
A Novel Technique for Enhancing Active and Reactive Power Quality for Renewab...IJMER
Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control concept is demonstrated with extensive MATLAB/Simulink simulation studies and results.
Power Quality Improvement at Distribution Level for Grid Connected Renewable ...IJERA Editor
The non-linear load current harmonics may result in voltage harmonics and can create a serious PQ problem in
the power system network. Active power filters (APF) are extensively used to compensate the load current
harmonics and load unbalance at distribution level. This results in an additional hardware cost. However, in this
project it has incorporated the features of APF in the conventional inverter interfacing renewable with the grid,
without any additional hardware cost. Here, the main idea is the maximum utilization of inverter rating which is
most of the time underutilized due to intermittent nature of RES. The grid-interfacing inverter can effectively be
utilized to perform the four important functions they are to transfer active power harvested from the renewable
resources (wind, solar, etc.), load reactive power demand support, current harmonics compensation at PCC and
current unbalance and neutral current compensation in case of 3-phase 4-wire system. Moreover, with adequate
control of grid-interfacing inverter, all the four objectives can be accomplished either individually or
simultaneously. The PQ constraints at the PCC can therefore be strictly maintained within the utility standards
without additional hardware cost.
With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear
unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control
concept is demonstrated with extensive MATLAB/Simulink simulation studies
A Novel control of a Grid-Interfacing Inverter to Improve the Quality of Powe...IJERA Editor
Renewable energy resources (RES) are being increas- ingly connected in distribution systems utilizing power electronic converters. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control concept is demonstrated with extensive MATLAB/Simulink simulation studies and validated through digital signal processor-based laboratory experimental results.
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1.compensation of reactive power using d statcom in grid interfaced pv systemEditorJST
This paper displays the upgrade of voltage droops, Harmonic mutilation and low power figure utilizing Distribution Static Compensator (D-STATCOM) with LCL Passive Filter in Distribution Framework. At whatever point there is an entrance of photovoltaic cell energy to the low voltage appropriated matrix, there happen the issue of confuse in voltage and recurrence in the system, maybe brought on by non-direct loads, creating music. The model depends on the Voltage Source Converter (VSC) guideline. The D-STATCOM infuses a current into the framework to alleviate the voltage lists. LCL Passive Filter Was then added to D-STATCOM to enhance symphonies bending and low power figure. The reproductions were performed utilizing MATLAB SIMULINK.
This paper presents a grid-connected photovoltaic (PV) interface for delivering both active and reactive powers. The PV interface employs H-bridge topology DC-DC converter and inverter with analog control technology. The power flow is controlled solely by the adjustable DC output voltage of the DC to DC converter. In order to evaluate the PV interface system’s performances, it is tested by delivering power to the grid with low pawer factor. The experimental results show that at 300W active load, the inverter could deliver the reactive power of 400VAR. The PV interface could also produce very low harmonic voltage and current distorsions. The laboratory measurements show that the total harmonic distortions of inverter output voltage and current are 0.46% and 0.05%, respectively.
Research Inventy : International Journal of Engineering and Scienceresearchinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Improvement of Power Quality using Fuzzy Logic Controller in Grid Connected P...IAES-IJPEDS
In this paper, the design of combined operation of UPQC and PV-ARRAY is designed. The proposed system is composed of series and shunt inverters connected back to back by a dc-link to which pv-array is connected. This system is able to compensate voltage and current related problems both in inter-connected mode and islanding mode by injecting active power to grid. The fundamental aspect is that the power electronic devices (PE) and sensitive equipments (SE) are normally designed to work in non-polluted power system, so they would suffer from malfunctions when supply voltage is not pure sinusoidal. Thus this proposed operating strategy with flexible operation mode improves the power quality of the grid system combining photovoltaic array with a control of unified power quality conditioner. Pulse Width Modulation (PWM) is used in both three phase four leg inverters. A Proportional Integral (PI) and Fuzzy Logic Controllers are used for power quality improvement by reducing the distortions in the output power. The simulated results were compared among the two controller’s strategies With pi controller and fuzzy logic controller
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
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
Power Quality Enhancement in Wind Connected Grid System Interface Based On St...IJERA Editor
Wind energy has become one of the significant alternative renewable energy resources because of its abundance
and the strong drive for its commercialization. Dynamic electric load variations and wind velocity excursions
cause excessive changes in the prime mover kinetic energy and the corresponding electrical power injected into
the AC grid utility system. In this paper, a scheme based on the low cost static switched filter compensator
(SSFC) is presented for voltage sag/swell compensation, power factor improvement in distribution grid
networks with the dispersed wind energy interface. The SSFC scheme is based on an intermittent switching
process between two shunt capacitor banks to be one of them in parallel with the capacitor of a tuned arm filter.
Two regulators based on a tri- loop dynamic error driven inter-coupled weighted modified proportional-integralderivative
(PID) controller which is used to modulate the PWM.
The Static Switched Filter Compensation (SSFC) compensation scheme which enhances the system
power quality has been fully validated using MATLAB–Simulink. The effectiveness of this compensation
scheme approach is demonstrated using a study case of 3 bus system. Simulation results show that there is
improvement in harmonics reduction, voltage sag/swell compensation, power factor improvement at generator
bus, load bus, and infinite bus respectively
This paper presents the control for Shunt Active Power (SAPF) filter in photovoltaic (PV) systems connected to the grid. The proposed configuration of the system consists of a photovoltaic array that connected to the grid through the three-phase inverter topology that also serves as an active filter. Photovoltaic is coupled in parallel with the direct curret (DC) side of the active filter. With this configuration, can be obtained three advantages, namely the elimination of harmonic currents caused by nonlinear load, reactive power injection, and injection of active power generated photovoltaic. The p-q Theory is used to calculate the harmonic reference current to be used to control the active filter coupled fotovoltaic in generating anti-harmonic currents. The results show that system can reduce harmonic distortion from THD 27.22% to be THD 1.05%, whereas when the active power from photovoltaic injected, the THD become 2.01%. Power sharing can also be seen from this study.
Grid Connected PV System with Power Quality Improvement Using Intelligent Con...IJMTST Journal
The depletion of the fossil fuel resources and the global warming effects has led the world to think
seriously of other alternative sources of energy. So renewable energy resources (RES) are being connected to
the distribution systems, mostly done by using power electronic converters. But use of power electronic
converters and non-linear loads like at distribution level injects harmonics, which intern cause power quality
problems. Distribution static compensator (DSTATCOM) is very popular in compensating power problems for
nonlinear and unbalanced loads. Any change in the load affects the DC-link voltage (DCLV) directly.
Conventionally, a PI controller is used to maintain the DCLV to the reference value, but its transient response
is poor. So, fuzzy logic controller is proposed which shows better dynamic response. To trigger inverter HCC
is used. The proposed inverter with the control when connected to wind energy, helps the 3-phase 4-wire
linear/non-linear unbalanced load at point of common coupling appear as balanced linear load to the grid.
With MATLAB/Simulink simulation studies, the proposed control technique is demonstrated and evaluated
here.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
Are you looking to streamline your workflows and boost your projects’ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, you’re in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Here’s what you’ll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
- Practical Applications in FME Form: Delve into key user parameter types including choice, connections, and file URLs. Allow users to control how a workflow runs, making your workflows more reusable. Learn to import values and deliver the best user experience for your workflows while enhancing accuracy.
- Optimization Strategies in FME Flow: Explore the creation and strategic deployment of parameters in FME Flow, including the use of deployment and geometry parameters, to maximize workflow efficiency.
- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf
I1101047680
1. IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 11, Issue 1 Ver. IV (Jan. – Feb. 2016), PP 76-80
www.iosrjournals.org
DOI: 10.9790/1676-1101047680 www.iosrjournals.org 76 | Page
Improving the Power Quality in a Grid Integrated PV System
S. Suganya1
, V. Suresh2
,
1
M.E – Power Electronics & Drives,Bannari Amman Institute of Technology, Sathyamangalam,
2
Assistant Professor, Bannari Amman Institute of Technology, Sathyamangalam,
Abstract: With The Increase In Energy Demand Due To The Depletion Of Fossil Fuel Resources, The
Renewable Energy Sources (Res) Are Connected In Distributed System Which Uses Power Electronics Devices.
The Use Of Power Electronics Devices Generate Harmonic Current And May Reduce Quality Of Power. This
Paper, Presents A Grid Interfacing Inverter Control That Compensates Power Quality Problems And Interface
Renewable Energy Sources With The Grid. The Res Used Here Is Photo Voltaic (Pv) System. The Grid
Interfacing Inverter Is Given With Hysteresis Current Control Method To Generate Gate Pulses And It Has The
Capability Of Injecting Res Power To The Grid, Reduces Load Unbalance, Load Harmonics, Reactive Power
Demand And Distortions. Total Harmonic Distortion (Thd) Of The Grid System
Keywords: Is Analyzed. This Concept Is Modeled And Simulated In Matlab/Simulink. Renewable Energy
Sources (Res), Photo Voltaic (Pv), Distributed Generation (Dg), Power Pq),
I. Introduction
The Energy Demand Is Increasing Due To The Increase In Population. There Will Be A Decrease In
The Power Generation Due To The Depletion Of Fossil Fuel Resources. But Increasing Air Pollution, Global
Warming, Diminishing Fossil Fuels And Their Increasing Cost Have Made It Nece ss ar y To Look Towards
Renewable Sources As A Future Energy Solution For Power Generation As It Has Advantages Like
Sustainability, Low Maintenance Cost, Environmental Friendly, Reduction Of Pollution, Etc [8]. Despite Of
The High Initial Cost And Low Efficiency, PV System Has Small Operation And Maintenance Cost As It Is
A Permanent Source Of Energy. Renewable Energy Sources (RES) Integrated At Distribution Level Is
Termed As Distributed Generation (DG). The High Penetration Level Of RES In Distribution Systems
Causes Issues In Terms Of Voltage
Regulation, Stability, And Power Quality (PQ) Problems Like Distortions, Harmonics, Etc. With The
Advancement In Power Electronic Converters And Inverters The PQ Problems Can Be Overcome.
However, The Extensive Use Of Power Electronics Based Equipment Generate Harmonic Currents Which
Affects The Quality Of Power.
A Few Control Strategies For Grid Connected Inverters Incorporating PQ Solution Have Been
Proposed. In [2] Inverter Is Controlled By Active Power Filter And Performance Comparison For
Maximum Power Extraction Was Analyzed. In General, To Interface The RES In Distribution System The
Current Controlled Voltage Source Inverter Are Used. On Integrating RES With The Grid Causes Non-Linear
Load Current Harmonics Which Can Create Serious PQ Problem In The Power System Network. Here The
Main Idea Is By Incorporating Certain Control Technique The Grid Interfacing Inverter Can Be Utilized
Maximum To Overcome The Power Quality Problem Without Any Additional Hardware Cost.
The Paper Is Arranged As Follows: Section II Describes The System Under Consideration. Section III
Describes The Inverter Control. Simulation Study Is Presented In Section IV And Finally Section V Concludes
The Paper.
System Description
The proposed system consist of RES (solar) connected to the dc link of the grid interfacing inverter as
shown in Fig. 1. The load connected here is both linear and non-linear load. Grid is connected to the step down
transformer to reduce the voltage level. The generated power from RES will be of variable in nature. The
renewable output is around 11V and the dc link plays an important role in transferring this variable power from
enewable energy source to the grid. The hysteresis current control method is used to generate switching pulses
to the grid interfacing inverter
2. Improving the Power Quality in a Grid Integrated PV System
DOI: 10.9790/1676-1101047680 www.iosrjournals.org 77 | Page
.
Inverter Control
The control technique of grid interfacing inverter is shown in Fig. 2. The regulation of dc-link voltage
carries the information regarding the exchange of active power between renewable source and grid and it
depends on the instantaneous energy available. The actual dc-link voltage (Vdc) is sensed and passed through
first-order low pass filter to eliminate the presence of switching ripples. The difference of this filtered dc-link
voltage and reference dc-link voltage is given to a discrete PI controller. The output of discrete PI controller is
multiplied with the actual phase voltage to produce current errors. These current errors are given to hysteresis
current controller to produce switching pulses (P1 to P8) for inverter working and the switching pattern is shown
in Table.1.The neutral.
Fig.2 Control technique of grid interfacing inverter
current present if any, due to the loads connected is compensated by fourth leg of the inverter.
Table.1 Switching Pattern for the Inverter
Logic P1 P2 P3 P4 P5 P6 P7 P8
Isa< (Isa
*
-hb) 0 1 0 1 0 1 0 1
Isa> (Isa
*
-hb) 1 0 1 0 1 0 1 0
If Isa<(Isa
*
-hb), then the upper switch S1 will be OFF(P1=0) and lower switch S4 will be ON(P4=1)in the phase
“a” leg of the inverter.
If Isa>(Isa
*
-hb), then the upper switch S1 will be ON(P1=1) and lower switch S4 will be OFF(P4=0)in the phase
“a” leg of the inverter.
where hb is the width of the hysteresis band
3. Improving the Power Quality in a Grid Integrated PV System
DOI: 10.9790/1676-1101047680 www.iosrjournals.org 78 | Page
Fig. 3 Simulink model of the system
Simulation Results
In order to verify the proposed control approach of grid interfacing inverter, the simulation study is
carried out using MATLAB/Simulink software. The Simulink model is shown in Fig.3.
Waveform Analysis
Without Inverter Control:
The simulation results for grid voltage, grid current and load current without inverter control are shown
in Fig.4 and Fig. 5. It is observed from the waveform that the amplitude of phase to phase r.m.s voltage is 100V,
the r.m.s value of grid and load current is 6A and has more distortions.
Fig. 4 Grid voltage and Grid current
Fig. 5 Load Current
The corresponding active and reactive power waveforms for Grid and Inverter without inverter control are shown
in Fig.6 and Fig.7 respectively. It is observed that without inverter control the amplitude of grid power is 1400W
and the inverter is 0.0002W.
Fig. 6 Grid Active and Reactive Power
4. Improving the Power Quality in a Grid Integrated PV System
DOI: 10.9790/1676-1101047680 www.iosrjournals.org 79 | Page
Fig. 7 Inverter Active and Reactive Power
With Inverter Control:
The simulation results for grid voltage, grid current and load current waveforms with inverter control are
shown in Fig.8.and Fig. 9 respectively. It is observed from the waveform that with the grid interfacing inverter
control the current harmonics can be effectively compensated and the distortions are reduced.
Fig. 8 Grid Voltage and Grid Current
Fig. 9 Load Current
The active and reactive power waveforms for Grid and Inverter with control are shown in Fig. 10 and Fig.
11 respectively. It is observed from the waveform that distortions are reduced and the amplitude of grid power is
4000W.
Fig. 10 Grid Active and Reactive Power
Fig. 11 Inverter Active and Reactive Power
5. Improving the Power Quality in a Grid Integrated PV System
DOI: 10.9790/1676-1101047680 www.iosrjournals.org 80 | Page
Total Harmonic Distortion (THD)
The Total Harmonic Distortion (THD) of the grid current without inverter and grid current with
inverter connection is investigated. The waveform analysis for THD with and without inverter control are shown
in Fig.12 and Fig.13 respectively.
Fig. 12 THD without Inverter control
Fig. 13 THD with Inverter control
Table. 2 THD values of Grid current
S. No Total Harmonic Distortion(%) Grid Current
1. Inverter –Without Hysteresis controller 17.03
2. Inverter –With Hysteresis controller 5.43
The THD of the grid current without inverter and with inverter connection are 17.03% and 5.43%
respectively. Table.2 shows the THD values of grid current before and after inverter connection.
II. Conclusion
This paper has presented a control for grid interfacing inverter to improve the quality of power for a 3
phase 4-wire system. It is shown that the grid interfacing inverter with the Hysteresis current control method can
be effectively utilized for real power transfer. The voltage, current and power flow waveforms are obtained. The
current harmonics and the reactive power demand of the grid is compensated. It has been found that total
harmonic distortion of grid current is reduced from 17.03% to 5.43%. This approach thus eliminates the need for
additional power conditioning equipment in grid connected PV system to improve the power quality.
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