电力工程技术2025，Vol.44Issue(4)：23-32,70,11.DOI:10.12158/j.2096-3203.2025.04.003
基于改进负序电压外环的SOP不对称故障电压支撑方案
Asymmetric fault voltage support scheme for soft open points based on improved negative sequence voltage outer loop
摘要
Abstract
Flexible interconnection and dynamic power flow regulation in distribution networks are achieved by soft open point(SOP),optimizing the configuration and scheduling of distribution resources.To improve the load voltage during asymmetric ground faults,it is proposed that positive and negative sequence currents are output by the converter during faults.This provides voltage support and enhances fault ride-through capability.However,actual operating conditions make open-loop optimization schemes susceptible.Poor performance is shown by traditional negative sequence voltage-based closed-loop support.In this paper,the conventional negative sequence voltage outer loop is improved by controlling the amplitude of negative sequence current to suppress the negative sequence voltage.The phase of the negative sequence current is adjusted to optimize the suppression effect.To enhance the inverter's capacity utilization and limit active power fluctuations,a comprehensive scheme is proposed for limiting the positive and negative sequence current amplitudes.A short-circuit fault simulation is constructed using PSCAD simulation software,based on the actual parameters of the distribution network.The simulation results show that the proposed control strategy significantly enhances voltage performance during fault conditions,improving the low-voltage ride-through capability.关键词
不对称接地故障/柔性软开关(SOP)/正负序电压支撑/电压外环/线路阻抗比/有功波动限制Key words
asymmetric ground fault/soft open point(SOP)/positive and negative sequence voltage support/voltage outer loop/line impedance ratio/limit active power fluctuations分类
信息技术与安全科学引用本文复制引用
王旭泽,陈武,赵海熙,陈实..基于改进负序电压外环的SOP不对称故障电压支撑方案[J].电力工程技术,2025,44(4):23-32,70,11.基金项目
国家重点研发计划资助项目"配电网高功率密度柔性互联技术和装备"(2023YFB2407400) （2023YFB2407400）
