Wind Energy Fed UPQC System for Power Quality Improvement (original) (raw)
Related papers
Moderation of Power Quality By Unified Power Quality Conditioner (UPQC) Using PQ Theory
2013
Majority of the distributed generations from renewable energy sources are connected to the grid through power electronic interface, which introduce additional harmonics in the distribution systems. Research is being carried out to integrate active filtering that is the combination of series APF and shunt APF connected back to back on the dc side and share a common dc-link capacitor with specific interface such that a common power quality (PQ) platform could be achieved. For generalized solution, a unified power quality conditioner (UPQC) could be the most comprehensive PQ protecting device for sensitive non-linear loads and Unbalanced, which require quality input supply. Also, load current harmonic isolation needs to be ensured for maintaining the quality of the supply current. The present paper describes a review for UPQC, for enhancing PQ of sensitive non-linear loads. Based on voltage compensation strategy, the control scheme has been designed, which are termed as UPQC with. A s the power circuit configuration of UPQC remains same for the model, with modification of control scheme only, the utility of UPQC can be optimized depending upon the application requirement. This paper presents a review on the UPQC to improve the electric power quality at distribution levels. Therefore, power can be transferred from one feeder to adjacent feeders to compensate for sag/swell and interruption. The performance of the UPQC as well as the adopted control algorithm is illustrated by simulation. The present work study the compensation principle and different control strategies used here are based on PI Controller of the UPQC in detail. The results obtained in MATLAB on feeder system show the effectiveness of the proposed configuration.
Applications of UPQC for Power Quality Improvement
In this paper, different applications of a Unified Power Quality (UPQC) for the improvement in power quality is presented. In addition to the power-factor correction, load balancing and mitigation of voltage and current harmonics, it can regulate the load voltage against voltage sag/swell and voltage dip in a three-phase three-wire distribution system for different combinations of linear and non-linear loads. The synchronous reference frame (SRF) theory is used to get the reference signals for series and shunt active power filters (APFs). The reference signals for the shunt and series APF of UPQC are derived from the control algorithm and sensed signals are used in a hysteresis controller to generate switching signals for shunt and series APFs. The UPQC is realized using two voltage source inverters (VSI) connected back to back, to a common dc link capacitor. MATLAB/Simulink based simulations are obtained, which support the functionality of the UPQC.
IJERT-Moderation of Power Quality By Unified Power Quality Conditioner (UPQC) Using PQ Theory
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/moderation-of-power-quality-by-unified-power-quality-conditioner-upqc-using-pq-theory https://www.ijert.org/research/moderation-of-power-quality-by-unified-power-quality-conditioner-upqc-using-pq-theory-IJERTV2IS101079.pdf Majority of the distributed generations from renewable energy sources are connected to the grid through power electronic interface, which introduce additional harmonics in the distribution systems. Research is being carried out to integrate active filtering that is the combination of series APF and shunt APF connected back to back on the dc side and share a common dc-link capacitor with specific interface such that a common power quality (PQ) platform could be achieved. For generalized solution, a unified power quality conditioner (UPQC) could be the most comprehensive PQ protecting device for sensitive non-linear loads and Unbalanced, which require quality input supply. Also, load current harmonic isolation needs to be ensured for maintaining the quality of the supply current. The present paper describes a review for UPQC, for enhancing PQ of sensitive non-linear loads. Based on voltage compensation strategy, the control scheme has been designed, which are termed as UPQC with. A s the power circuit configuration of UPQC remains same for the model, with modification of control scheme only, the utility of UPQC can be optimized depending upon the application requirement. This paper presents a review on the UPQC to improve the electric power quality at distribution levels. Therefore, power can be transferred from one feeder to adjacent feeders to compensate for sag/swell and interruption. The performance of the UPQC as well as the adopted control algorithm is illustrated by simulation. The present work study the compensation principle and different control strategies used here are based on PI Controller of the UPQC in detail. The results obtained in MATLAB on feeder system show the effectiveness of the proposed configuration.
Power Quality Improvement by UPQC based on Voltage Source Converters
ISSN: 2349-0845, Vol 2, Issue 1
In modern power system consists of wide range of electrical, electronic and power electronic equipment in commercial and industrial applications. Since most of the electronic equipment’s are nonlinear in nature these will induce harmonics in the system, which affect the sensitive loads to be fed from the system. These problems are partially solved with the help of LC passive filters. However, this kind of filter cannot solve random variation in the load current wave form and voltage wave form. Active filters can resolve this problem. However, the cost of active filters is high. They are difficult to implement in large scale. Additionally, they also present lower efficiency than shunt passive filters. One of the many solutions is the use of a combined system of shunt and active series filters like Unified Power Quality Conditioner (UPQC) which aims at achieving a low cost under highly effective control. The UPQC device combines a shunt active filter together with a series active filter in a back-to-back configuration, to simultaneously compensate the supply voltage and the load current or to mitigate any type of voltage and current fluctuations and power factor correction in a power distribution network, such that improved power quality can be made available at the point of common coupling. The control strategies are modeled using MATLAB/SIMULINK. The performance is also observed under influence of utility side disturbances such as harmonics and voltage sags. The simulation results are compared without and with UPQC for the verification of results.
A Study of Unified Power Quality Conditioner in Wind Energy Conversion System
2018
ABSTRACT: Wind energy is one of the most efficient as well as cost effective renewable energy resources for generating electricity compared to other conventional types of energy resources. When wind energy source is integrated to the existing power system, various power quality issues arise at different level of power system. To overcome these problems, here a unified power quality conditioner (UPQC) in wind energy conversion system (WECS) is used. In Unified Power Quality Conditioner (UPQC) a series active filter and a shunt active filter are connected in a back-toback configuration to simultaneously compensate the problems due to voltage distortion, voltage unbalances and to compensate harmonics produced due to current.
Improvement in Power Quality Problems Using Unified Power Quality Controller (UPQC
This paper deals with conceptual study of unified power quality conditioner (UPQC) during voltage sag and swell on the power network.Power quality has become an important factor in power systems, for consumer and household appliances with production of various electric and electronic equipment and computer systems. The main causes of a poor power quality are harmonic currents, poor power factor, supply voltage variations etc. The Unified Power Quality Conditioner (UPQC) is a custom power device, which diminishes voltage and current related power quality issues. It also prevents load current harmonics from entering the utility and corrects the input power factor of the load. The system performance for current harmonics, voltage harmonics, voltage sag and voltage swell will be evaluated. The MATLAB / Simulink based simulations will be provided which support the functionality of the UPQC.
International Journal of Trend in Scientific Research and Development
This paper deals with the power quality condition which is the integration of the series active and shunt active filter the main concept is that while considering the harmonic distortion or the voltage mitigation problem of the device UPQC usually compensate various element of the power system which has a negative impact on the system by eliminating it UPQC is a reliable device due to its nominal cost and fast response with low error handing capabilities. Whenever we consider any transmission and distribution system there are many electrical loads which are very important for the facing of the voltage variation .This paper present a novel method through which we will developing a control method for shunt active filter and PQ theory based control technique for series active filter to compensate power problem in a 3 phase four wire UPQC .The purpose UPQC will improve the power quality of power distribution system under balanced and distorted load condition. The control scheme used is the hysteresis voltage controller by using a-b-c to d-q transformation.
Design and Implementation of UPQC to Solve Power Quality Problems
Abstract— this paper deals with conceptual study of Unified Power Quality Conditioner (UPQC) during voltage sag and swell on the power network. Power quality has become an important factor in power systems, for household appliances with production of various electric and electronic equipment and computer systems. The main reasons of a poor power quality are harmonic currents, reduced power factor, supply voltage variations etc. The Unified Power Quality Conditioner (UPQC) is a custom power device, which diminishes voltage and current related power quality issues. It also prevents load current harmonics from entering the utility and corrects the input power factor of the load. The system performance for current and voltage harmonics, voltage sags and voltage swell have been evaluated. The results obtained by means of the MATLAB / SIMULINK based simulations support the functionality of the UPQC.
Study of Power Quality Improvement Using UPQC
This paper describes role of UPQC as applied to a 3P4W system to improve PQ. The Forth wire of 3P4W system is developed by means of neutral of series transformer. Neutral current which flows through neutral terminal of transformer is removed with the help of 4 leg voltage source inverter (VSI) topology for shunt part. The series transformer neutral will have 0 potential in all conditions of operation. Simulation is carried out by considering the major PQ issues like voltage, current, harmonic by connecting load which is nonlinear in nature to 3P4W scheme with UPQC. A novel control strategy of unit vector template is implemented here for designing series APF. By extending the principle of single phase PQ theory, series APF can be used for balancing the unbalanced voltage present at the load side. The PQ theory as applied to the 3 phase balanced system can even be independently used for unbalanced system.
The issue of power quality has gained popularity in the recent years because of the widespread use of power electronic devices, larger interconnected load networks and widespread use of non-conventional source of electrical energy like wind power, solar power etc. in the power system. The deterioration of the power quality may cause unwanted losses in the system, poor efficiency, interference with the communication lines, and faulty operation of devices and even may cause fault in some devices. In this paper the power quality issue because of the presence of non-linear load connected to the electric grid is discussed and an effort has been made to improve the power quality of the system using a device known as Unified Power Quality Conditioner (UPQC). For this the intelligent controlled UPQC is developed and used with the Grid supply connected to the Non-linear load and percentage Total Harmonic Distortion (THD) of voltage and current waveforms is measured in order to determine the power quality at different locations in the system. The intelligent controlled method has been found to have superior performance over the conventional Proportional Integral (PI) controlled UPQC. The results obtained verified using MATLAB/SIMULINK software.