Frequency Regulation in Islanded Microgrid Using Demand Response

TL;DR

This paper presents a method for detecting islanding in microgrids using current detection and proposes a demand response strategy to regulate frequency during islanded operation, ensuring stability and proper management.

Contribution

It introduces a novel current-based islanding detection method and applies demand response for frequency regulation in islanded microgrids, addressing transient constraints.

Findings

Effective islanding detection via current detection method

Demand response successfully regulates frequency during islanded operation

Improved stability and management of islanded microgrids

Abstract

Introducing more Distributed Generation (DG) into power grid infrastructure drives more attention to understand how large scale DG affects grid operation. Islanding is an important concern in this area. Islanding refers to the condition that DGs within a microgrid continue energizing while the microgrid has been disconnected from the main grid. Considering the adverse effects of Islanding, it should be detected and managed in a proper way. After Islanding has been detected, even though the first option is tripping all inverterbased DG unit in the system, the system has this option to work as a stand-alone microgrid. For achieving this goal, the frequency of microgrid should be regulated. This paper proposes an islanding detection method based on current detection in a parallel arm with the fuse arm of the microgrid. After islanding detection, this paper presents an effective implementation Demand Response (DR) to regulate the frequency in islanded microgrid as an Ancillary Service (AS) considering the transient constraints of frequency in inverterbased generations.