张莹,曾成碧.三相桥式半控整流电路失控分析及其抑制策略研究[J].电测与仪表,2020,57(19):66-71. Zhang Ying,Zeng Chengbi.Analysis on the runaway of three-phase bridge half-controlled rectifier circuit and its suppression measure[J].Electrical Measurement & Instrumentation,2020,57(19):66-71.
三相桥式半控整流电路失控分析及其抑制策略研究
Analysis on the runaway of three-phase bridge half-controlled rectifier circuit and its suppression measure
The output voltage of the three-phase bridge half-controlled rectifier circuit is often used as the exciting voltage in the excitation system of small and medium-sized turbo-generator sets. However, it is easy to be out of control and affect the normal operation of generator set. In this paper, the causes of the runaway of the three-phase bridge half-controlled rectifier circuit are studied in depth, and the operation state of the circuit after the runaway under the loss of the firing pulse is analyzed. Based on a suppression method with a parallel freewheeling diode, an improved circuit with parallel resistance and capacitance is proposed to ensure the reliability turn-off of the thyristor. Finally, the simulation experiment based on Matlab/Simulink verifies the feasibility so as to provide theoretical support for improving the operation stability of generator set.
