基于单纯形法思想的城市高压电网非线性无功优化

Nonlinear Reactive Power Optimization Based on Idea of the Simplex Method for Urban High Voltage Power Systems

针对城市高压电网的无功优化问题,采用拟牛顿法优化潮流,计算补偿节点的无功需求,确定电容器组的投切状态,并作为进一步优化的初值.将电容器组补偿节点的无功灵敏度大小作为选择"进基"、"出基"变量的依据,借鉴单纯形法基点转换的基本思想优化电容器组投切状态,减小有功损耗.最终进行以综合费用为目标的综合无功优化,确定当前时刻往后24 h内的电容器组和变压器分接头状态.通过实际算例验证了该方法的有效性.

For the reactive power optimization problem in urban high voltage power systems,the quasi Newton optimal power flow is applied to compute the reactive power demand in compensation nodes,and to determine the switching on/out states of capacitor banks.The obtained result is regarded as the initial value for further computation.＇Call in＇ and ＇call out＇ variables are selected referring to the reactive power sensitivities.By using the idea of base transformation in the simplex method,the switching on/out states of capacitor banks are optimized to reduce the total active power loss.Finally,the compositive cost is used as the objective for optimization to determine the capacitor bank states and tap changers in the next 24 hours.The effectiveness of the proposed approach is examined in an actual testing system.