전력-가스 연계 마이크로그리드를 위한 2단계 유효전력-무효전력 통합 제어 에너지 관리 시스템

Abstract

This paper proposes a two-level energy management system to enhance the renewable energy integration capacity and economic operation of a power-gas sector coupled microgrid. The method was formulated as a master-slave based min-max optimization problem, considering the reactive power compensation capabilities of renewable energy resources, electrolyzer, and energy storage system. It ensured active power balance while incorporating reactive power management through its two-level structure. To validate its effectiveness, the method was compared with a benchmark system, which only considers active power balance, in an IEEE-33 bus system. The proposed method improved the average minimum voltage by 0.015 p.u. and enhanced the voltage deviation profile by 46.92%. The method reduced power purchases from the grid, saving daily operating cost by up to 211,703 KRW. These outcomes demonstrate that the proposed method enables stable and economical operation of power-gas sector coupled microgrid.