This paper presents a filter structure for improving the performance of switching band controlled Dynamic Voltage Restorer (DVR) and a systematic design procedure for the passive filter components. The switching operation of VSI is accompanied by a band controller which restricts the injected voltages within a band, defined about a reference voltage. Switching band control method exhibits merits such as fast dynamic response, robustness, zero magnitude / phase errors and ease in implementation. The performance of the band controller is improved using a novel filter structure. Quantitative expressions involving the dynamics of DVR and variation in switching frequency are also derived. The passive filter components are designed based on switching frequency and inverter rating. The proposed filter structure and design procedure for the DVR filter components are validated by carrying out PSCAD simulation studies.

Mahesh Kumar Mishra

Department of Electrical Engineering

S. Sasitharan

BOUNDARY CONTROLLER

DYNAMIC VOLTAGE RESTORER (DVR)

SERIES COMPENSATOR

VOLTAGE SAG/SWELL

Voltage source inverter

Active filters

Control theory

Controllers

Dynamic response

Electric inverters

Electric power supplies to apparatus

Passive filters

Structural design

Switching frequency

Videodisks

Voltage regulators

Electric control equipment

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Design of passive filter components for switching band controlled DVR

IEEE Region 10 Annual International Conference, Proceedings/TENCON

A Single Phase Dynamic Voltage Restorer (DVR) based on five-level ground point shifting multilevel inverter topology has been proposed in this paper. The proposed inverter has a floating ground point. Therefore, by shifting the ground point, it is observed that the inverter circuit gives five output voltage levels from single DC voltage source. This configuration uses less number of switches compared to the existing multilevel inverter topologies. A fast sag swell identification technique using d-q reference frame is also discussed in this paper. This proposed topology of the DVR can compensate voltage sag, swell, flicker and maintain the required voltage at the load bus. The detailed simulation study is carried out using MATLAB/Simulink to validate the result. © 2017 IEEE.

2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering, CPE-POWERENG 2017

Single Phase Dynamic Voltage Restorer topology based on five-level ground point shifting inverter

The unified power quality conditioner (UPQC) is a custom power device, which mitigates voltage and current-related PQ issues in the power distribution systems. In this paper, a UPQC topology for applications with non-stiff source is proposed. The proposed topology enables UPQC to have a reduced dc-link voltage without compromising its compensation capability. This proposed topology also helps to match the dc-link voltage requirement of the shunt and series active filters of the UPQC. The topology uses a capacitor in series with the interfacing inductor of the shunt active filter, and the system neutral is connected to the negative terminal of the dc-link voltage to avoid the requirement of the fourth leg in the voltage source inverter (VSI) of the shunt active filter. The average switching frequency of the switches in the VSI also reduces, consequently the switching losses in the inverters reduce. Detailed design aspects of the series capacitor and VSI parameters have been discussed in the paper. A simulation study of the proposed topology has been carried out using PSCAD simulator, and the results are presented. Experimental studies are carried out on three-phase UPQC prototype to verify the proposed topology. © 1982-2012 IEEE.

IEEE Transactions on Industrial Electronics

A modified three-phase four-wire UPQC topology with reduced DC-link voltage rating

The Unified Power Quality Conditioner (UPQC) is a custom power device, which mitigates voltage and current related power quality issues in the power distribution systems. In this paper, two new Voltage Source Inverter (VSI) topologies for UPQC application are proposed. The proposed topologies enables UPQC to have a reduced DC link voltage without compromising the compensation capability. These proposed topologies also help to match the DC link voltage requirement of the shunt and series active filters in the UPQC. In this paper the proposed UPQC topologies are compared with the existing topologies in the literature. A simulation study of the proposed topologies has been carried out and the results are presented. © 2011 IEEE.

2011 International Conference on Power and Energy Systems, ICPS 2011

Comparison of various Voltage Source Inverter based UPQC topologies

This paper proposes an improved scheme of hysteresis voltage control for a three-level dynamic voltage restorer (DVR) application. The basic three-level hysteresis controller offers advantages including ease of implementation and good dynamic performance, but the switching frequency is subjected to wide variation. Also, the maximum frequency may exceed tolerable limits, as the width of the voltage band becomes narrower. The improved three-level switching scheme overcomes the above drawback and results in a reduced switching frequency and lower switching losses. The suggested scheme also results in reduced stress levels on the switches. Detailed analysis and simulation study have been carried out using PSCAD software.

IET Conference Publications

Reduced switching frequency algorithm for three-level diode clamped inverter based DVR

Understanding Power Quality Problems

Mitigation of Interruptions and Voltage Sags

IEEE Transactions on Power Electronics

Design and Comparison of High Performance Stationary-Frame Controllers for DVR Implementation

APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition

Fast Transient Control for Three-Phase Capacitor-Supported Dynamic Voltage Restorer (DVR)

IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society

Modeling and Simulation of Dynamic Voltage Restorer (DVR) Based on Hysteresis Voltage Control

Compensation Voltage Control in Dynamic Voltage Restorers by Use of Feed Forward and State Feedback Scheme

Journal	IEEE Region 10 Annual International Conference, Proceedings/TENCON
Open Access	No