Phasor Measurement Unit-Based Power Sharing for Optimal Decentralized Controller Design of Inverter-based Microgrid

Abstract

Nowadays, a powerful controller is essential for cost and reliability concerns for the future smart grid. In this way, the decentralized inverter control is used extensively in the microgrids. Limited system stability is mainly one of the most important issues that face the decentralized inverter control because of the lack of communications among the different distributed generation (DG) inverters. In this paper, the stability enhancement of the droop based decentralized inverter control in the microgrid is investigated. An optimal control strategy based on power sharing is proposed to incorporate the information provided by phasor measurement units (PMU) to improve the microgrid stability. The traditional droop controller has been modified to improve the stability of the microgrid. An optimal controller design based on the desired power sharing of each DG unit and the acquired information of total generation is proposed. The performance of the proposed control strategy is evaluated based on the nonlinear time domain analysis. The results show satisfactory performance with efficient damping characteristics and confirm the effectiveness of the proposed controller.