引用本文:贠保记,马柯翔,司渭滨,等.配电网单相接地故障的柔性熄弧装置[J].电力系统保护与控制,2021,49(19):124-134.
YUN Baoji,MA Kexiang,SI Weibin,et al.Flexible arc extinguishing device for a single-phase ground fault in a distribution network[J].Power System Protection and Control,2021,49(19):124-134
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配电网单相接地故障的柔性熄弧装置
贠保记，马柯翔，司渭滨，宋国兵，雷智荣，党长富，曾祥君
(1.西安科技大学，陕西 西安 710054；2.西安西瑞控制技术股份有限公司，陕西 西安 710077； 3.国网陕西省电力公司安康供电公司，陕西 安康 725000；4.西安交通大学，陕西 西安 710054； 5.智能电网运行与控制湖南省重点实验室(长沙理工大学)，湖南 长沙 410004)
摘要:
现有柔性熄弧方法仅利用有源逆变器控制故障点电压为零,熄弧电源容量高达50 kVA，且体积较大。针对这一问题，在电压熄弧的基础上，提出了功率源转换与有源逆变器结合的柔性熄弧方法。在配电网发生单相接地故障时，通过功率源转换将中性点电压反相钳位到接近于故障相电源电压，偏差电压的幅值和相位通过有源逆变器进行精确补偿，使故障点电压远小于熄弧电压，实现快速熄弧。在利用Matlab/Simulink对传统消弧线圈的仿真基础上，仿真了仅投功率源转换、功率源转换结合有源逆变器的柔性熄弧方法在各工况下的运行特性。通过10 kV真型配网实验场，验证了该方法的有效性。结果表明该柔性熄弧装置可以有效降低故障点电压，实现快速熄弧，大大降低有源逆变器的容量。
关键词:  单相接地故障  功率源转换  有源逆变器  柔性熄弧  故障点电压
DOI：DOI: 10.19783/j.cnki.pspc.210767
分类号:
基金项目:陕西省重点产业创新(群)项目(2019ZDLGY18-07)
Flexible arc extinguishing device for a single-phase ground fault in a distribution network
YUN Baoji, MA Kexiang, SI Weibin, SONG Guobing, LEI Zhirong, DANG Changfu, ZENG Xiangjun
(1. Xi'an University of Science and Technology, Xi'an 710054, China; 2. Xi'an Xirui Control Technology Co., Ltd., Xi'an 710077, China; 3. Ankang Power Supply Company, State Grid Shaanxi Electric Power Company, Ankang 725000, China; 4. Xi'an Jiaotong University, Xi'an 710054, China; 5. Hunan Province Key Laboratory of Smart Grids Operation and Control (Changsha University of Science and Technology), Changsha 410004, China)
Abstract:
The existing flexible arc extinguishing method uses only an active inverter to control the fault point voltage to zero. The arc extinguishing power supply has a capacity of up to 50 kVA and takes up a relatively large volume. To improve this, a flexible arc extinguishing method combining power source conversion and an active inverter is proposed. When a single-phase ground fault occurs, the neutral point voltage is clamped to be close to the power supply voltage of the fault phase through power source conversion, and the amplitude and phase of the deviation voltage are accurately compensated by the active inverter, so that the voltage at the fault point is much smaller than the arc extinguishing voltage. Based on a simulation of the traditional arc suppression coil using Matlab/Simulink, the operating characteristics of the flexible arc suppression method with only power source conversion, power source conversion combined with active inverters under various working conditions are simulated. The effectiveness of the method is verified by the 10 kV true distribution network test field. The results show that the flexible arc extinguishing device can effectively reduce the voltage at the fault point, realize rapid arc extinguishing, and greatly reduce the capacity of the active inverter. This work is supported by the Key Industry Innovation (Mass) Project of Shaanxi Province (No. 2019ZDLGY18-07).
Key words:  single-phase ground fault  power source conversion  active inverter  flexible arc extinguishing  fault point voltage
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