基于两层规划的电力系统N-K故障分析方法

传统的电力系统N-K故障分析一般采用组合遍历的方式,存在故障组合数量大、计算效率低的缺点。文中建立了此类问题的两层规划模型,通过寻优方式确定造成电网损失最大的故障组合。上层问题在故障重数给定的条件下,寻求能够引起电网切负荷量最大的故障组合。下层问题则针对上层问题决策的故障组合,模拟电网事故后的运行情况,在满足电网各类运行约束的条件下,通过调整发电机组输出功率最小化电网切负荷量,进一步给出了模型的遗传算法求解流程。最后,通过IEEE-14节点和IEEE-118节点算例系统,对模型有效性进行了验证。

N-K Fault Analysis Method for Power Systems Based on Two-level Programming

The traditional N-K fault analysis of power system generally adopts the method based on combination and traversal,which has the disadvantages of a large number of fault combinations and low computational efficiency.In this paper,the two-level programming model of this kind of problem is established,which can seek the fault combination causing the maximum amount of grid load through the way of optimization.Aiming at the fault combination determined by the upper-level problem,the lower-level problem simulates the operation of the grid after the accident,to meet the various types of power system operation constraints,by adjusting the generator output power to minimize the amount of grid load.Furtherly the flowchart of genetic algorithm to solve this problem is given.Finally,the validity of the model is verified through IEEE14 node and IEEE118 node example system.