Switching Technology of Three-Terminals Soft Open Point Control Mode

doi:10.11930/j.issn.1004-9649.202203028

Abstract

Abstract: This paper proposes a three-terminals soft open point (SOP) operation control mode switching technology under the multi-feeder faults. Firstly, combined with the inner and outer loop structures of control mode of three-terminals SOP, a control mode switching strategy with improved control logic is proposed. Secondly, in order to realize the smooth transition between SOP working modes under multiple feeder faults, a control mode switching process suitable for three-terminals SOP under multiple feeder faults is proposed. Then, by adopting the phase angle pre-synchronization strategy, the smoothness of the phase angle when the power-loss feeder is connected to the grid is ensured. Thirdly, the phase angle pre-synchronization strategy is adopted to ensure the smoothness of the phase angle when the power-loss feeder is connected to the grid. Finally, A power distribution system model with three-terminals SOP is built for simulation. The simulation results show that the proposed operation control mode switching technology can reduce the maximum voltage fluctuation on the DC side, and the voltage and phase angle of each port can transition smoothly.

Key words: soft open point, control mode switching, multi-feeder faults, phase angle pre-synchronization

WANG Hui, CAO Yi, LUO Ning, GAO Hua, ZHANG Yan, ZHANG Yu, CHENG Haozhong. Switching Technology of Three-Terminals Soft Open Point Control Mode[J]. Electric Power, 2023, 56(4): 104-111.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202203028

https://www.electricpower.com.cn/EN/Y2023/V56/I4/104

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