Development of Reclosing Method in a Distribution System with Distributed Generation and Battery Energy Storage System

Hun-Chul Seo

doi:10.3390/en11061407

Abstract

The connection of distributed generation (DG) and a battery energy storage system (BESS) in distribution systems has recently been increasing. However, little research has been conducted on the reclosing of the distribution system when both the DG and BESS are connected. Therefore, this paper proposes a new reclosing method for a distribution system with a DG and BESS. The proposed method also has a circuit breaker (CB) installed in the distribution line. A CB close to the DG and BESS is first reclosed after a fixed dead time and, then, the fault clearance is detected using the current flowing to the fault point. Once the fault is cleared, the reclosing of the CB at the source side is attempted after completing a synchronism check. The proposed method is modeled using an electromagnetic transient program. We perform various simulations according to the capacities of the DG and the fault clearance time, and analyze the simulation results. The simulation results show that steady-state power is supplied to the load from the DG and BESS before reclosing to prevent outage, and that the reclosing is successfully performed.

Highlights

The grid connection of distributed generation (DG) and battery energy storage systems (BESSs) is increasing
The reclosing of circuit breaker 2 (CB2) was performed after completing the synchronism check
Before reclosing, it was confirmed that the steady-state power was continuously supplied to Load 2 by the DG and BESS 2, and the voltage and frequency were maintained within the normal range

Summary

Introduction

The grid connection of distributed generation (DG) and battery energy storage systems (BESSs) is increasing. When the DG and BESS are connected to a distribution system simultaneously, various problems might arise in terms of system operation, such as scheduling, power quality, protection, reliability, and flow. Energy management, scheduling, and planning in distribution systems with DG and BESSs have been discussed in References [6,7,8,9,10,11]. None of the previous studies have dealt with the protection issue

Methods

Results

Discussion

Conclusion