Simulation and Analysis of Dynamic Voltage Restorer with PI Controller under Different Fault Condition

Abstract

This document gives formatting instructions for authors preparing papers for publication in the Proceedings of an IEEE conference. The authors must follow the instructions given in the document for the papers to be published. You can use this document as both an instruction set and as a template into which you can type your own text. The demand for quality power has become a challenging issue for industrial area and consumers. Among them voltage unbalance is considered as the major affecting problem leads to degradation in performance of electrical equipments. FACTS devices used for compensation are the best method to overcome such problem. Among them DVR considered the most efficient and cost effective. In a control system of the DVR main consideration includes: detection of the start and finish of the sag, voltage reference generation, transient and steady-state control of the injected voltage, and protection of the system. In this work, the simulation model of nonlinear load connected power distribution system with Dynamic voltage Restorer controlled by PI Controller has been developed using Matlab/Simulink. In this case we simulate three fault likewise: Three-line to ground fault, Double-line to ground fault and Single-line to ground fault with two different PI controller to study the THD.

Introduction

I. INTRODUCTION

With thousands of load centres and hundreds of producing stations connected by extensive power transmission and distribution networks, modern electric power systems are dense networks. Due to significant energy and economic costs, power quality is a key problem in today's industry. Many power quality issues, including voltage sags, swells, and harmonics, as well as the loss of sine waveform purity, are caused by a growing number of sophisticated electrical and electronic devices, such as computers, programmable logic controllers, and variable speed drives. These devices are highly sensitive to disturbances and non-linear loads at distribution systems. One of the worst disruptions to industrial equipment is thought to be voltage sags.

Using a dynamic voltage restorer (DVR) is another power electronic approach for voltage management. One type of specialized power equipment for dependable distribution power quality is the DVR. In order to compensate for fluctuations in voltage, they employ a range of voltage boost methods utilizing solid state switches. DVRs are mostly used for vulnerable loads, where variations in system voltage might have a negative impact on performance.

The DVR is a simple, flexible, and reliable solution for voltage sag problems. In a couple of milliseconds, it may restore the voltage and avoid the load from losing power. The primary function of the DVR is to identify voltage sags and use an injection transformer to inject the missing voltage in series with the bus.

The DVR's output voltage waveform has excellent stability and uniformity. Harmonic adjustment and voltage transient mitigation are features of the DVR. A DVR can be implemented using a variety of circuit topologies and control approaches. Apart from compensating for voltage sags and swells, DVRs can have additional functionalities including line voltage harmonics correction, minimizing voltage transients, and fault current restrictions. An Injection/Booster transformer, a Harmonic filter, a Voltage Source Converter (VSC), a DC charging circuit, and a Control and Protection system make up the overall DVR setup.

II. DYNAMIC VOLTAGE RESTORER

The basic operation principle of DVR is measuring the missing voltage by using control unit and injecting the dynamically controlled missing voltage in series to the line and providing the load voltage unchanged during sag. The phase angle and amplitude of the injected voltage fluctuate during sag. As a result, the distribution network and DVR will be able to govern the interchange of active and reactive electricity.

An injection transformer, a bank of capacitors for energy storage, and a GTO or IGBT make up a DVR, a solid state power electronics switching device. The load depicted in Fig. 1 is connected in series with a distribution system. Using an injecting transformer, the DVR's main concept is to inject a regulated voltage produced by a forced commuted converter in series with the bus voltage. This voltage is controlled by a DC to AC converter using a sinusoidal PWM approach.

Conclusion

Quality power has become a difficult problem for consumers, Among them is the imbalance of voltage and is thought to be the main factor for electrical device performance to decrease. Using FACTS devices for compensation is the most effective way to deal with this kind of issue. DVR is said to be the most economical and efficient of them all. To demonstrate the efficacy of DVR in mitigating various errors, MATLAB is utilized to model a basic distribution network. In this work, a simulation model of a nonlinear load linked power distribution system with a dynamic voltage restorer controlled by a PI controller is built using Matlab/Simulink. The study\'s conclusions show that the recommended DVR system effectively corrects for voltage sag brought on by single-, double-, and three-phase line to ground faults as well as harmonics generated by nonlinear loads.

References

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Copyright

Copyright © 2024 Budhraj ., Dr. M. K. Bhaskar, Manish Parihar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.