基于电网拓扑优化的电压稳定预防控制方法

电压稳定是电力系统安全稳定运行的重要内容之一,然而某些故障或扰动的发生可能导致系统的负荷裕度大幅度降低,甚至造成电压失稳。为增强系统的电压稳定性,提出采用改变母线运行方式的方法优化电网拓扑结构,从而提高电力系统的负荷裕度,确保基态系统和预想事故下的电压稳定性。提出了计及预想事故的电压稳定预防控制模型,并发展了一套阶段式的母线运行方式优化求解方法。首先利用线路参数的灵敏度指标对母线运行方案进行预筛选,快速筛选出可以提高负荷裕度的备选方案集,以减小计算规模;随后在此集合上基于look-ahead裕度指标对运行方案排序,并以连续潮流法的分析结果确定有效母线运行方案;最后,通过IEEE 118和1648节点系统的仿真结果验证了所提方法的有效性。

Methodology for Voltage Stability Preventive Control Based on Grid Network Topology Optimization

Voltage stability is one of the important parts for the secure and stable operation in power systems.However,some credible contingencies may cause the load margin significantly reduced to a lower level and even cause voltage instability.To increase the voltage stability,the bus operation mode is applied to optimize the grid network topology to enhance the load margin of power system and ensure the voltage stability for base case and contingency cases.The contingency-constrained voltage stability preventive control model is proposed,and a stage-based bus operation mode optimization methodology is developed in this paper.To reduce the computation complexity,the sensitivity of line parameters is employed to pre-screen the candidate set in which the bus operation schemes can enhance the load margin,and the effective ones are ranked by the look-ahead margin method.Finally,the continuation power flow method is used to identify the‘best??bus operation schemes.Numerical studies on the IEEE 118-bus power system and 1648-bus power system demonstrate the effectiveness of the proposed methodology.