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间歇性可再生能源发电出力的随机性、波动性及缺乏主网的支撑，增大了孤岛微电网系统的安全稳定运行风险，由此有必要对其进行静态安全性评估。安全分析准则和潮流计算是电力系统静态安全风险评估的基础。针对对等控制孤岛微电网的特性，提出结合N?1事故与解列方案的静态安全分析准则；并计及故障解列后孤岛系统的无平衡节点特性及存在的不确定性因素，提出基于LMIL(Levenberg Marquardt method with inexact line-search)算法的随机潮流模拟法，计算解列孤岛系统的随机潮流，进而得到考虑频率越限风险的静态安全风险指标的概率分布，以更全面地评估系统的静态安全水平。以17节点孤岛微电网测试系统为算例，验证了所提评估方法的正确性和有效性。“,”ABSTRACT:The random and volatile output of inntermittent renewable energy power generation, and lack of the main network support, increase security operation risk of the islanded microgrid system. So it is necessary to carry out static security assessment for it. Safety analysis criteria and power flow calculation are the basis of power grid static security risk assessment. According to characteristics of the islanded microgrid under peer-peer control, a static security analysis criteria combined N?1 contingency and splitting scheme was proposed. Considering a larger number of uncertainties and the characteristic that the islanded system splitted caused by outages has not a balance node, a probabilistic power flow simulation calculation method based on Levenberg Marquardt method with inexact line-search (LMIL) algorithm was proposed to calculate probabilistic power flow of the islanded systems splitted. Further, probability distributions of static security risk indices considering frequency limit violation risk index were obtained. It can be more comprehensive to assess the system static security risk. Assessment results on 17-node islanded microgrid test system verified the feasibility and validity of the proposed method.