变电站10 kV母线旁路转供带电作业研究与仿真

Research and Simulation of Live Operation of 10-kV Bus Bypass and Load Transfer in Substation

为了研究变电站10 kV母线旁路转供带电作业过程,同时考虑母线旁路转供带电作业合环、解环前后时刻的暂稳态过程,本文首先提出基于叠加原理的单位电流法,实时计算合环操作过程中的循环电流;接着提出通过提高合环开关两侧母线负荷对称度以及减小合环开关两侧母线电压相量差来提高母线合环转供成功率,并运用MATLAB/Simulink仿真软件进行验证;最后采用电弧黑盒模型模拟电弧的暂态特性,并分别从分闸角、电缆导体截面积、电缆长度、合环开关两侧母线负荷对称度以及合环开关两侧母线电压相量差五个角度,研究合环开关解环过程对电弧电流的影响因素,并运用ATP-EMTP仿真软件进行分析研究。

In order to research the live operation of 10-kV bus bypass and load transfer in substation and consider the transient steady state process before and after ring closing and ring unwinding, this paper first proposes a unit current method based on superposition principle to calculate the circulating current in the loop closing operation process in real time. Then, it is proposed to improve the success rate of bus turn-over by increasing the load symmetry of bus on both sides of the turn-over switch and reducing the voltage phase difference between bus on both sides of the turn-over switch and use MATLAB/Simulink simulation software to verify. Finally arc black box model are adopted to simulate the transient characteristics of arc, and respectively from five angles: the brake angle, cable conductor cross-sectional area, length of cable, closed loop switch on both sides of the bus load switch with symmetry and closed loop on both sides of the bus voltage phasor differential, the influence factors of the closed loop switch power network process on the arc current are analyzed, and ATP-EMTP simulation software is used for analysis.