CAJ | 학술논문

在连锁故障研究过程中,对其可能给电网带来的风险进行预警可以引导运行人员实现科学决策,从而避免大面积停电的发生.为实现连锁故障的预警分级,首先应用模糊C 均值聚类及其修正方法对连锁故障概率进行分级,然后将失负荷、低电压和过负荷指标作为输入变量,构建反映电网静态安全水平的故障严重度模糊规则和隶属函数集,应用模糊推理方法对综合严重度等级进行划分,最后将概率和严重度综合,根据最大隶属度原则确定连锁故障风险预警的等级.以IEEE-RTS79系统为算例评估了不同的初始扰动下电网发生连锁故障后的风险水平,并分析了电网运行状态的差异对连锁故障预警等级的影响,验证了算法的合理性和有效性.
재련쇄고장연구과정중,대기가능급전망대래적풍험진행예경가이인도운행인원실현과학결책,종이피면대면적정전적발생.위실현련쇄고장적예경분급,수선응용모호C 균치취류급기수정방법대련쇄고장개솔진행분급,연후장실부하、저전압화과부하지표작위수입변량,구건반영전망정태안전수평적고장엄중도모호규칙화대속함수집,응용모호추리방법대종합엄중도등급진행화분,최후장개솔화엄중도종합,근거최대대속도원칙학정련쇄고장풍험예경적등급.이IEEE-RTS79계통위산례평고료불동적초시우동하전망발생련쇄고장후적풍험수평,병분석료전망운행상태적차이대련쇄고장예경등급적영향,험증료산법적합이성화유효성.
To avoid blackout of power grid, during the research on cascading failure the forewarning of risk brought by it can guide the grid operation personnel to make scientific decision. Firstly, to implement the grading of forewarning of cascading failure risks the fuzzy C-means clustering and its correction are utilized to grade the probability of cascading failures; secondly, taking the indices of lost load, low voltage and overload as input variables, the fuzzy rules and membership function sets of failure severity, which can reflect static security level of power grid, are constructed and applying fuzzy inference the synthetical severity is graded; finally, synthesizing the probability of cascading failures with the severity of failure and according to the principle of the maximum membership, the forewarning levels of cascading failure risk is determined. Taking IEEE-RTS 79 system for example, the risk levels of power grid after the occurrence of cascading failures under different initial disturbances are evaluated, and the impacts of differences of power grid operating conditions on forewarning levels of cascading failures are analyzed, thus the rationality and effectiveness of the proposed algorithm are verified.