Power Sharing Scheme for an Islanded Microgrid Including Renewables and Battery Storage

Jiahui Jiang, C. Coates
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引用次数: 4

Abstract

Microgrids provide an effective way to increase renewable energy (RE) penetration level in the power network. The cooperation of renewable microsources, energy storage systems (ESSs) and conventional dispatchable microsources is an important issue in the operation of an islanded microgrid. In this paper, the designed power sharing scheme aims to maximize renewable penetration level by giving RE the priority of power supply. This requires RE to be able to regulate grid voltage rather than only operating under power control mode (PCM) in the conventional way. Droop control strategy is modified to support a microsource operating under both voltage control mode (VCM) and PCM, and switching between both modes automatically. It also enables “peer to peer” and “plug and play” operation of a microgrid. Meanwhile, the characteristics of power sources (photovoltaic and batteries) are considered. DC/DC converter controller is proposed correspondingly with the aim of keeping the system stable. Simulations have been conducted to verify its effectiveness.
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包含可再生能源和电池存储的孤岛微电网电力共享方案
微电网为提高可再生能源在电网中的渗透水平提供了有效途径。可再生微源、储能系统和传统可调度微源的合作是孤岛微网运行中的一个重要问题。本文设计的电力共享方案旨在通过赋予可再生能源供电优先权,使可再生能源普及率达到最高。这要求RE能够调节电网电压,而不是仅以传统方式在功率控制模式(PCM)下运行。改进了下垂控制策略以支持微源在电压控制模式(VCM)和PCM下同时工作,并在两种模式之间自动切换。它还可以实现微电网的“点对点”和“即插即用”操作。同时,考虑了电源(光伏和电池)的特性。为了保证系统的稳定,提出了相应的DC/DC变换器控制器。通过仿真验证了该方法的有效性。
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