摘要
随着电网的发展与扩大,N-k故障日益成为造成大规模停电事故的主要原因之一。为研究电网中N-k故障的风险,首先建立考虑多种因素的输电线路可靠性模型和考虑隐性故障的保护系统运行可靠性模型;然后针对传统的系统可靠性评估方法的不足,提出了考虑N-k故障的输电系统风险评估方法,实现系统实时运行情况有效地计算出N-k故障的路径;基于保护元件的隐性故障分析,结合风险理论,建立符合市场要求下的输电系统N-k故障运行风险模型,该模型能有效地结合电网的运行安全性和经济性。最后基于IEEE-RTS79可靠性测试系统进行算例仿真,结果表明,保护配置的方案、输电线率所处运行环境和线路容量都会对N-k故障风险产生相应的影响,基于可靠性理论可以很好地评估输电系统N-k故障运行风险。
With the development of grid, N-k contingency has become one of the main reasons of blackout. To study the risk of N-k contingency, the reliability models of transmission lines considering various factors and hidden fault of protection system were established. In addition, as to the deficiency of traditional reliability assessment method, a risk assessment method of transmission lines considering N-k contingency, which can calculate the realtime N-k contingency paths effectively. Based on hidden fault of protection system and combined with risk theory,N-k contingency operational risk model of transmission system is established according to market condition. Finally, case of simulation was analyzed based on IEEE-RTS79 system. The result shows N-k contingency risk of transmission system can be assessed on the basis of reliability theory.
出处
《电力科学与工程》
2015年第10期56-63,共8页
Electric Power Science and Engineering
关键词
N-k故障
输电系统
隐性故障
风险评估
N-k contingency
transmission system
hidden fault
risk assessment
