基于继电保护隐性故障的电力系统连锁故障分析

Analysis of power system cascading failure based on hidden failures of protective relaying

分析了现有的三种继电保护隐性故障模型,建立了新的线路潮流越限时隐性故障模型。该模型考虑了由保护定值导致的可修复隐性故障、由硬件老化导致的不可修复隐性故障以及由恶劣环境等因素引发的隐性故障。采用直流潮流法对电力系统进行连锁故障风险评估,找出风险指标大的关键线路,并据此提出了减小系统连锁故障风险的措施。对TS-9节点系统仿真结果表明,通过提高线路保护装置的可靠性,改善线路的负载能力都能降低风险值,减小系统发生停电的概率。

This paper analyzes three existing hidden failure models, proposes a new hidden failure model considering repairable hidden failure, aging hidden failure and the hidden failure caused by adverse environment. It uses DC power flow algorithm to assess the risk of power system cascading failure, thus to find out the key-lines. On this basis the preventive measures to reduce the risk of power system cascading failure are put forward. The results of applying the proposed method to TS-9 bus test system illustrate improving the reliability of the relay and the line capacity can reduce the risk and the propability of blackout.