Implementation of a Photovoltaic Inverter with Modified Automatic Voltage Regulator Control Designed to Mitigate Momentary Voltage Dip

Anderson Rodrigo Piccini,Ana Maria Denardi,Geraldo Caixeta Guimarães,Arthur Costa De Souza

doi:10.3390/en14196244

Abstract

The main objective of this research is to propose an active and reactive power injection control in order to mitigate voltage sags. The proposed control strategy works in conjunction with a modified version of an automatic voltage regulator (AVR), where it will act on the active and reactive powers injected by the inverter to reduce the effects of voltage sags. In this way, the control will avoid possible shutdowns and damage to the equipment connected to the grid. The voltage improvement can be perceived for consumers connected to the power system. Modifications in AVR model and parameters are performed to speed up its performance, thus identifying the short-duration voltage variations (SDVV) and, consequently, the control acts to alter the powers, decreasing the active power injection and increasing the reactive power based on inverter capacity during the momentary voltage dip (MVD). Finally, when the fault is cleared, all values return to the pre-fault condition, so that the inverter only operates with active power. A 75 kW three-phase grid-connected photovoltaic system (GCPVS) equipped with the proposed control was inserted in a distribution grid of the city of Palmas, state of Tocantins, Brazil, and all of the computer simulations were performed on the Matlab/Simulink®.

Highlights

Over the past two decades, distributed generation (DG) using renewable energy sources, the generation of photovoltaic energy, has become one of the most promising new technologies
In order to carry out tests and simulations, the complete grid-connected photovoltaic systems (GCPVS) model was implemented together with the proposed control for short-duration voltage variation (SDVV)/momentary voltage dip (MVD) on the Matlab/Simulink®
This paper proposes a control strategy for a grid-connected photovoltaic system focused on mitigatating the effects of short-duration voltage variation (SDVV), the momentary voltage dip (MVD)

Summary

Introduction

Over the past two decades, distributed generation (DG) using renewable energy sources, the generation of photovoltaic energy, has become one of the most promising new technologies. Due to the increasing adoption of this resource, grid-connected photovoltaic systems (GCPVS) are developing at a very fast pace and will soon be a large part of energy generation in some regions [1,4]. In view of this fact, many countries have established new requirements grid code (GCs) for GCPVS to remain connected during some fault. There is a change in the dynamic behavior and impact in the distribution grid which is being inserted [4,6,7,8]

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Conclusion