电网电压暂降下配电网SOP系统的大信号稳定性分析及虚拟电容器控制策略  

Large-Signal Stability Analysis and Virtual Capacitor Control Strategy of Distribution Network SOP System Under Grid Voltage Dips

作　　者：阚鹏 郑华俊 袁旭峰[1] 熊炜[1] 张超[1] 蔡永翔 KAN Peng;ZHENG Huajun;YUAN Xufeng;XIONG Wei;ZHANG Chao;CAI Yongxiang(College of Electrical Engineering,Guizhou University,Guiyang 550025,China;Electric Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China)

机构地区：[1]贵州大学电气工程学院,贵阳550025 [2]贵州电网有限责任公司电力科学研究院,贵阳550002

出　　处：《南方电网技术》2025年第2期36-47,共12页Southern Power System Technology

基　　金：国家自然科学基金资助项目(52067004,52367005,52367019);国家重点研发计划资助项目(2022YFE0205300);贵州省科技项目(ZK[2022]一般154;[2022]一般012);贵州大学引进人才科研项目(贵大人基合字[2020] 16号)。

摘　　要：智能软开关(soft open point,SOP)能够提供实时潮流控制、故障快速自愈和馈线负载平衡,在配电网中得到了广泛应用。然而,电网电压暂降(grid voltage dips,GVD)是典型的大扰动工况,无法通过小信号方法分析配电网SOP在该工况下的稳定运行机理。为此,采用混合势理论(mixed potential theory,MPT)研究了GVD工况下SOP的稳定性,并提出了增强SOP稳定性的参数优化策略和虚拟电容控制策略。首先,建立了SOP的非线性平均模型。在此基础上,利用MPT推导出SOP在GVD条件下的大信号稳定性判据(large signal stability criterion,LSSC)。此外,为了增强SOP系统的稳定性,基于LSSC提出了参数优化策略和构建虚拟电容的控制策略。最后,通过MATLAB/Simulink时域仿真验证了上述方法的有效性,即:1)基于LSSC可以有效地分析SOP在GVD下的稳定性;2)基于LSSC的系统参数优化策略和构建虚拟电容控制策略可以有效提高系统在大扰动条件下的稳定运行能力。Soft open point(SOP)can provide real-time power flow control,fast fault self-healing and feeder load balancing,and has been widely used in distribution networks.However,grid voltage dips(GVD)are typical large disturbance conditions,and the stable operation mechanism of distribution network SOP under these conditions cannot be analyzed through small signal methods.Therefore,the mixed potential theory(MPT)is used to study the stability of SOP under GVD conditions,and the parameter optimiza-tion strategies and virtual capacitor control strategies are proposed.Firstly,a nonlinear average model of SOP is established.On this basis,the large signal stability criterion(LSSC)for SOP under GVD conditions is derived using MPT.In addition,in order to enhance the stability of the SOP system,parameter optimization strategies and control strategies for constructing virtual capacitors are proposed based on LSSC.Finally,the effectiveness of the above method is verified through MATLAB/Simulink time-domain simula-tion,namely:1)based on LSSC,the stability of SOP under GVD can be effectively analyzed;2)the system prameter optimization strategy based on LSSC and the construction of virtual capacitor control strategy can effectively improve the stable operation ability of the system under large disturbance conditions.

关 键 词：电网电压暂降 智能软开关 混合势理论 大信号稳定性 虚拟电容器 

分 类 号：TM76[电气工程—电力系统及自动化]