不平衡零序电压快速精准抑制与电压消弧全补偿优化控制方法  

Optimal Control Method for Accurate and Fast Suppression of Unbalanced Zero-Sequence Voltage and Voltage Arc Suppression Full Compensation

作　　者：刘宝稳[1] 曾祥君[2] 张慧芬[3] 马宏忠[1] Liu Baowen;Zeng Xiangjun;Zhang Huifen;Ma Hongzhong(College of Energy and Electrical Engineering Hohai University Nanjing 211100,China;Hunan Province Key Laboratory of Smart Grids Operation and Control Changsha University of Science and Technology Changsha 410114,China;School of Automation and Electrical Engineering University of Jinan Jinan 250022,China)

机构地区：[1]河海大学能源与电气学院,南京211100 [2]智能电网运行与控制湖南省重点实验室(长沙理工大学),长沙410114 [3]济南大学自动化与电气工程学院,济南250022

出　　处：《电工技术学报》2022年第3期645-654,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金重点项目(51737002);江苏省自然科学基金青年基金(BK20190490);中央高校基本科研业务费项目(B200202173);国家电网公司科学技术项目(52170217000S)资助。

摘　　要：现有配电网不平衡零序电压抑制方法需要多次注入电流,逐步跟踪抑制,存在控制过程复杂、收敛速度慢的缺点。当电网发生单相接地故障后,传统电压消弧法未计及电网三相对地分布参数不对称的影响,未能将故障相电压完全抑制为0,从而导致接地点存在残余电流,不能实现100%消弧。该文在建立注入电流诱发配电网零序电压变化机制的基础上,实现了配电网自然不平衡电流的在线测量,论证了配电网三相对地分布参数不对称对接地点残余电流的影响,提出了仅需调节一次注入电流即可实现不平衡零序电压快速精准抑制和电压消弧全补偿的新方法,并给出接地故障判定、零序电压抑制与消弧的优化控制方案。理论和仿真证实,该方法在电网正常运行时无需多次调参而能将不平衡零序电压精准快速抑制为0,且当发生单相接地故障时具备补偿电网三相对地分布参数不对称产生的残余电流,可将故障相电压完全抑制为0,实现100%电压消弧全补偿。The existing methods of unbalanced zero sequence voltage suppression in distribution network need multiple current injection and gradual tracking suppression,which have the disadvantages of complex control process and slow convergence speed.When single-phase grounding fault occurs,the traditional voltage arc suppression method does not take into account the influence of three-phase distribution parameter asymmetry of power grid,and fails to completely suppress the fault phase voltage to zero,resulting in residual current in grounding point,which can not achieve 100%arc suppression.Based on the mechanism of zero sequence voltage variation induced by injection current,this paper realizes the on-line measurement of natural unbalanced current in distribution network,and demonstrates the influence of asymmetric distribution parameters of three phases on residual current in distribution network.Methods of fast and accurate suppression of unbalanced zero sequence voltage and full compensation of voltage arc suppression were proposed by adjusting the injection current only once,and the optimal control scheme of ground fault determination,zero sequence voltage suppression and arc suppression were given.Theoretical and simulation results show that this method can accurately and quickly suppress the unbalanced zero sequence voltage to 0 without multiple parameter adjustments during normal operation of power grid,and can compensate the residual current generated by asymmetric three-phase to ground distribution parameters of power grid in case of single-phase to ground fault,which can completely suppress the voltage of fault phase to 0 and realize 100%voltage arc suppression full compensation.

关 键 词：电流注入法 不平衡零序电压抑制 电压消弧全补偿 单相接地故障 分布参数不对称 

分 类 号：TM74[电气工程—电力系统及自动化]