Autonomous decentralized control of off-grid DC micro-grid

Abstract

According to the basic idea of autonomous decentralized system, this paper divides the various units of off-grid DC micro-grid into different roles , and each roles are given specific control objectives and control strategy. In order to verify the effectiveness of the proposed off-grid DC micro-grid autonomous decentralized control strategy, this paper creates an off-grid DC micro-grid simulation model containing distributed generation, energy storage, and DC constant power load in PSCAD/EMTDC. Simulation results show that the strategy can respond quickly in the working condition of load fluctuations, energy storage reaches capacity limits, and distributed power source output fluctuation, thus enhance the stability and power supply quality of the system.