Optimal Control Method for Accurate and Fast Suppression of Unbalanced Zero-Sequence Voltage and Voltage Arc Suppression Full Compensation
Liu Baowen1, Zeng Xiangjun2, Zhang Huifen3, Ma Hongzhong1
1. College of Energy and Electrical Engineering Hohai University Nanjing 211100 China; 2. Hunan Province Key Laboratory of Smart Grids Operation and Control Changsha University of Science and Technology Changsha 410114 China; 3. School of Automation and Electrical Engineering University of Jinan Jinan 250022 China
Abstract：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.
刘宝稳, 曾祥君, 张慧芬, 马宏忠. 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[J]. 电工技术学报, 2022, 37(3): 645-654.
Liu Baowen, Zeng Xiangjun, Zhang Huifen, Ma Hongzhong. Optimal Control Method for Accurate and Fast Suppression of Unbalanced Zero-Sequence Voltage and Voltage Arc Suppression Full Compensation. Transactions of China Electrotechnical Society, 2022, 37(3): 645-654.
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2022, Vol. 37 
