大电网静态电压稳定在线防控灵敏度分析新方法

A New Method of Sensitivity Analysis for Static Voltage Stability Online Prevention and Control of Large Power Grids

大电网静态电压稳定预防控制在线决策的核心环节是稳定裕度及其与控制变量间灵敏度关系的快速计算,为此提出一种基于调控对状态的影响和单断面参数辨识方法实现静态电压稳定裕度与控制参数间解析灵敏度关系的计算方法。通过常规潮流方程总结了调控量与状态量间的灵敏度关系;然后基于单一状态断面的戴维南等值参数辨识方法并结合等值参数与稳定裕度之间的数学关系,推演出调控量与稳定裕度间的解析关联灵敏度。该方法不仅避免了中间的潮流计算过程以及参数辨识环节,而且无需求取临界点处潮流雅可比矩阵的零特征值所对应的左特征向量,适用于大规模电力系统的在线优化防控以及计及调控影响的在线中长期静态电压稳定分析。仿真算例验证了所提方法的准确性和快速性。

The core of online decision-making of static voltage stability prevention control for large power grids is fast calculation of stability margin and its sensitivity relationship with control variables.Therefore,based on the influence of regulation on state and single-section Thevenin equivalent parameter identification method,this paper proposes a calculation method to realize the analytic sensitivity relationship between static voltage stability margin and control parameters.The sensitivity relationship between regulation quantity and state quantity is summarized with conventional power flow equation.Then,based on single-section Thevenin equivalent parameter identification method,by combining with the mathematical relationship between the equivalent parameters and the stability margin,the analytical sensitivity correlation between control quantity and stability margin is derived.The method avoids intermediate power flow calculation process and parameter identification,and does not need to seek the left eigenvector corresponding to the zero eigenvalue of power flow Jacobian matrix at the critical point.It is suitable for online medium and long-term static voltage stability analysis considering the influence of regulation and prevention control optimization of large power grids.Accuracy and rapidity of the proposed method is verified by simulation results.