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微电网源荷功率不平衡将导致微电网频率波动.为维持离网情况下微电网频率稳定,充分利用各微电源的发电优势,本文针对商业应用价值较高的光储型微电网,提出了一种基于分层控制思路的离网情况下微电网频率控制算法.根据频率动态特性将系统频率分为4个区域,针对不同频率区域通过储能或光伏发电系统的主动调节作用、低频减载和高频切机等控制措施实现频率的稳定控制.经实例验证,所提策略可对微电网中多类型微电源进行协调控制,以满足微电网功率平衡要求,维持系统频率稳定.“,”The power imbalance between micro-sources and loads in the microgrid will result in the frequency fluctuations.In order to maintain the frequency stability of the islanded microgrid,and make full use of the generation advantages of each micro-source,a frequency control strategy of islanded microgrid based on the hierarchical control is presented in this paper as to PV-ESS microgrid that has high commercial value.The system frequency is divided into four areas according to its dynamic characteristics,and stable frequency control can be realized through such control strategies as active regulations by energy storages or photovoltaic systems,high-frequency generator tripping and low-frequency load shedding as to different frequency areas.It is verified from case analysis that the proposed strategy can effectively coordinate and control different types of micro-sources in microgrid to balance the system power and maintain the system frequency stability.