基于桥式不控整流隔离型三相交流过电压故障检测电路研究

Research on Isolated Three-Phase AC Overvoltage Fault Detection Circuit Based on Bridge Uncontrolled Rectification

摘要: 本文提出了一种基于桥式不控整流隔离型三相交流过电压故障检测电路。在分析了该电路原理后，建立分压整流电路的戴维南等效电路模型，根据等效电路模型推导出三相交流电压分压后的数学模型，建立一阶时域模型，设计电路的相关参数。最后在PSIM软件中搭建了仿真模型，并进行了仿真验证。仿真结果表明，非正常工作电压下电路能向DSP传输保护信号；正常工作电压下不会向DSP传输故障信号。

Abstract: This paper presents an isolated three-phase AC overvoltage fault detection circuit based on bridge uncontrolled rectification. After analyzing the principle of the circuit, the Thevenin equivalent circuit model of the voltage divider rectifier circuit is established. According to the equivalent circuit model, the mathematical model of the three-phase AC voltage divider is derived, the first-order time-domain model is established, and the relevant parameters of the circuit are designed. Finally, a simulation model is built in PSIM and verified by simulation. The simulation results show that the circuit can transmit protection signals to DSP under abnormal operating voltage; no fault signal will be transmitted to DSP under normal operating voltage.