计及微电源出力随机性与负荷分级的微电网供电可靠性分析.docVIP

 计及微电源出力随机性与负荷分级的微电 网供电可靠性分析# 5 10  摘要：随着微电网相关技术的不断成熟，制定完整的微电网供电可靠性评估体系已经成为了 最为重要的理论研究环节之一。本文在故障模式分析法和蒙特卡洛模拟法的基础上，提出了 一种计及微电源出力随机特性的可靠性指标计算方法，并利用该方法对某算例系统的系统可 靠性指标和用户可靠性指标进行了计算。接着引入负荷分级机制，并在该算例中分析了不同 分级方法下用户和微网系统的可靠性指标的变化，据此对微电网负荷分级模式提出相关建 议。 关键词：电力系统自动化；微网；可靠性指标；故障模式分析法；离网失效率；负荷分级 中图分类号：TM 734 15 Reliability Evaluation of Microgrid Power Supple Considering the random characteristics of Microgeneration’s Output and Load Classification GUO Siqi, YUAN Yue, FU Zhixin, XIE Xiang, CAO Yang 20 25 30 35 40 (Research Center for Renewable Energy Generation Engineering of Ministry of Education, HoHai University, Nanjing, 211100) Abstract: With the microgrid and its correlated technologies becoming more and more mature, formulating a complete system of microgrid reliability evaluation has become one of the most important theoretical researches. Based on the Failure Mode Analysis method and the sampleing process of Monte Carlo simulation method, this paper puts forward an algorithm of evaluating microgrid reliaibity indexs considering the influence of the random characteristics of microgeneration’s output. With this algorithm, the reliability indexes of load points in microgrid and the whole microgrid system indexes are both achieved in a simulative system. Next, the mechanism of load classification is introduced, the variations about reliability indexs of customers and microgrid system in different classification methods are analysised, some recommendations about mode of mircogrid’s load classification are given in the point of view of this mechanism. Key words: power system and its automation; microgrid; reliability index; failure mode analysis method; failure rate; load classification 0 引言 近年来微电网（以下简称“微网”）以其具有自治、稳定、兼容、灵活、经济的特点受 到越来越多的关注。微网能高效地利用分布式电源，提高电网的利用率，改善用户供电可靠 性和电能质量，实现电网的安全运行[1]。微网有并网和自治两种运行方式[2-4]，并网运行时 由大电网和微网内分布式电源联合给网内负荷供电。当大电网出现故障或存在电能质量问题 时，微网自治（离网）运行，即仅由内部分布式电源对负荷进行供电。 在传统的配电网可靠性评估中，由于配电系统“环网设计，开环运行”的特点，馈线由 单一电源点供电，任何一条馈线上发生故障，都可能导致馈线后所有负荷停电[5]。微网的接