基于源-荷协同的电网静态安全校正最优控制算法

为消除N-1事故情况下的线路过载和节点电压越限,提出了一种基于源-荷协同的电网静态安全校正最优控制算法。针对调整机组出力和切负荷两种静态安全校正措施,分析电网静态安全校正控制代价,在满足电网静态安全约束前提下,以系统整体控制代价最小为目标,建立电网静态安全校正控制模型。考虑可控负荷的离散特性,按切负荷代价由小到大的顺序形成切负荷控制策略表,并应用灵敏度指标从切负荷策略表中截取候选切负荷策略,分析各切负荷策略代价,协同静态安全校正控制模型,求解最小切负荷策略下发电机组出力的可行解。算例分析验证了离散的切负荷策略对应切负荷方案可行性强,避免负荷欠切和过切问题,源-荷协同静态安全校正控制能以最小控制代价有效消除N-1状态的节点过电压和线路过载。

Optimal control algorithm for static safety correction of power grid based on source-load coordination

In order to eliminate line overload and node overvoltage in N-1 accident, an optimal static security correction control algorithm based on source-load coordination is proposed in this paper. Aiming at the static security correction measures of adjusting generator output and cutting off load, the static security correction control cost of power grid is analyzed. On the premise of satisfying the static security constraints of power grid, the static security correction control model of power grid is established with the objective of minimizing the overall control cost of the system. Considering the discrete characteristics of controllable load, a load-shedding control strategy table is formed according to the order of load-shedding cost from small to large. The load-shedding strategy is selected from the load-shedding strategy table by using sensitivity index. The cost of each load-shedding strategy is analyzed, and the static safety correction control model is coordinated to solve the generator unit output under the minimum load-shedding strategy. The case study shows that the discrete load-shedding strategy is feasible for load-shedding schemes, avoiding the problem of too little and too much load-shedding. The source-load cooperative static security correction control can effectively eliminate the node overvoltage and line overload in the N-1 accident with the minimum control cost. This work is supported by National Key Research and Development Program of China (No. 2018YFB0904800).