互联电网安全稳定控制系统可靠性评估

文章基于互联电网安全稳定控制系统(security and stability control system, SSCS)分层结构和有向指令传输, 建立概率加权有向图模型; 由于该模型不具有布尔特性, 基于路径搜索算法, 提出概率加权全连通矩阵; 从维护有功平衡能力角度, 提出 SSCS 功能可靠性指标。为提高 SSCS 可靠性, 提出功能可靠性指标对直流线路可靠性参数的灵敏度模型。研究结果表明: 上层控制站点和连接通道较多的控制站点对 SSCS 可靠性影响较大; 提高系统结构的可靠性、增加可调节容量, 有助于改善功能可靠性和提高大型跨区电网频率稳定水平。

Based on the hierarchical structure of interconnected power grid security and stability control system (SSCS) and directed instruction transmission, a probability weighted directed graph model is established. Since the model does not have Boolean characteristics, a probability weighted fully connected matrix is proposed based on the path search algorithm. From the view of maintaining active power balance ability, the functional reliability index of SSCS is proposed. In order to improve the reliability of SSCS, the sensitivity model of functional reliability index to DC line reliability parameters is proposed. The results show that the upper control stations and the control stations with more connecting channels have a greater impact on the reliability of SSCS. Improving the reliability of the system structure and increasing the adjustable capacity is helpful to improve the functional reliability and the frequency stability level of large cross-regional power grid.