电网可靠性对可控串联补偿部件参数的灵敏度分解算法

可控串联补偿器(TCSC)是一种常见的柔性输电设备,多用于改善输电能力。现有TCSC对其电容器组、电抗器等部件的可靠性建模较为粗略,因此无法直接描述部件可靠性对电网可靠性的影响。考虑部件故障模式,提出TCSC可靠性分层等值算法,建立含TCSC线路可靠性状态空间模型。基于改进频率和持续时间(FD)算法,求解串联补偿线路状态概率和转移率,及其对部件可靠性参数的灵敏度。联立电网可靠性对串联补偿线路可靠性、串联补偿线路可靠性对TCSC部件灵敏度,提出电网可靠性对TCSC部件参数的灵敏度分解算法。算例分析验证了算法的可行性和正确性,有助于从电网角度发现和改善柔性交流输电设备的薄弱环节。

Sensitivity Decomposition Algorithm of Power System Reliability Oriented to Parameters of TCSC Components

As a kind of flexible transmission equipment, the thyristor controlled series compensator(TCSC)is used to improve transmission capacity. The existing reliability model of TCSC seldom considers its components, such as capacitor bank and reactor, thus the impact of components'' availability on power system reliability cannot be analytically quantified. According to the failure modes of the components, hierarchical reliability equivalence is proposed to derive the state space model for the series compensated line. With the improved frequency and duration(F&D)method, the state probabilities and transition rates and their sensitivity to the component''s availability are quantified. Finally, the sensitivity of system indices to the series compensated line, and sensitivity of the line to the TCSC components, are combined to yield the reliability decomposition model of the power system reliability to the TCSC components. A numerical analysis has validated the feasibility and accuracy of the model proposed which is conducive to finding and improving the vulnerable components of the flexible transmission equipment from the viewpoint of power system operations. This work is supported by National Natural Science Foundation of China(No. 51277049).