Abstract
The intermittent and irregular characteristics of the renewable power generation bring about tremendous technical challenges for large-scale deployment and efficient management. Aiming at this problem an islanded microgrid system with an electric-hydrogen hybrid energy storage system is established. In the islanded microgrid system, the hydrogen storage device mainly includes the electrolytic cell, the fuel cell, and the hydrogen storage tank. The energy storage system is clean and pollution free, which can improve the utilization rate of renewable power generation and stabilize the DC bus voltage fluctuation. Each unit collects and distributes energy to the DC bus through a DC/DC converter and energy management strategy. To provide a reasonable planning of the islanded microgrid with an electric-hydrogen hybrid energy storage system, a planning optimization method considering unit cost, load loss rate, and excess energy rate is established, and the particle swarm optimization algorithm is used to solve the problem. Under the premise of satisfying the constraints of each component, the capacity allocation scheme under the optimal conditions of a comprehensive economy and power supply reliability index is obtained, and the effectiveness of the proposed method is verified.
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