抑制电压暂降的线路改造方案多目标优化

Multi⁃objective Optimization of Line Modification Scheme with Voltage Sag Suppression

更好地抑制电压暂降已成为供用电双方共同关注的焦点,低成本、科学合理地抑制电压暂降已成为重要课题。针对现有电压暂降治理优化研究中对线路改造策略优化研究较少且多采用单目标优化方法,缺乏合理性和有效性的不足,提出考虑电压暂降的线路改造策略多目标优化方法。基于蒙特卡洛法评估采用线路改造策略后的电压暂降严重程度指标、度量线路改造策略的技术有效性,同时考虑线路改造策略投资成本和预期收益,建立以电压暂降严重程度和线路改造投资成本与预期收益为目标的线路改造方策略多目标优化模型,采用位移密度估计强度帕累托进化算法求解该模型。以IEEE 30节点系统为算例仿真验证所提考虑电压暂降的线路改造策略多目标优化模型的有效性、灵活性和实用性。

Voltage sag suppression is a focus issue concerned by both power suppliers and customers,scien⁃tific and reasonable suppression of voltage sag at low cost has become into an important subject.In view of such issues as less optimization study of line modification strategy during the study of existing voltage sag treatment and optimization and main adoption of single target optimization method,lack of rationality and validity,a multi⁃objective optimization method of line modification strategy with consideration of voltage sag is proposed.The severity of voltage sag after adoption of line modification strategy is assessed by Monte Carlo method,the technical effectiveness of line modification strategy is measured.At the same time,con⁃sidering the investment costs and the expected return of line modification strategy,a multi⁃objective optimi⁃zation model of line modification strategy with voltage sag severity and line modification investment cost and expected return as target is set up.The model is solved by adopting the displacement density estimation strength Pareto evolutionary algorithm.The IEEE 30 node system is taken as the calculation example to sim⁃ulate and verify the effectiveness、flexibility and practicability of the multi⁃objective optimization model of line modification considering the proposed voltage sag.