Phase-shifting transformers are an effective method for controlling power flow,which can significantly improve the dynamic performance of power systems.To ensure the safe and reliable operation of the power system,it is urgent to investigate the impact of phase-shifting transformers on traditional distance protection after their connection to the transmission lines.Given that most power system failures are asymmetrical,modeling and analyzing the positive,negative,and zero-sequence equivalent impedances of single-core phase-shifting transformers becomes crucial.This paper takes the 110 kV single-core symmetrical phase-shifting transformer as the research object,delving into its fundamental principles.A phase-sequence impedance model of the single-core phase-shifting transformer is established,and the feasibility of the compensated distance protection scheme is e-valuated.The single-core phase-shifting transformer model is built on the Matlab/Simulink platform,simulating asymmetrical short-circuit faults on the line,and the effectiveness of the compensated distance protection scheme under the positive,negative,and zero-sequence equivalent impedance model is verified.
关键词
单芯移相变压器/序等值阻抗/适应性分析/经补偿的距离保护
Key words
single-core phase-shifting transformer/sequence equivalent impedance/adaptive analysis/distance protection with compensation
维普
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