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为了消除无功电流、提高电网功率因数,将有源功率因数校正电路(APFC)应用于可连续运行动态电压恢复器(UDVR)中。通过控制APFC电路中的开关管可以抑制整流器向系统注入的谐波,并将电网功率因数提高到近似为1。单相APFC电路采用电压外环、电流内环的双闭环控制策略,控制电路简单、成本低。逆变器采用开环控制策略,补偿策略采用同相位电压补偿策略。MATLAB仿真结果表明,基于APFC电路的可连续运行的动态电压恢复器可以对电压暂降进行持续补偿,使负载获得纯净的正弦输入电压。
In order to eliminate the reactive current and improve the grid power factor, the active power factor correction circuit (APFC) is applied to the continuously running dynamic voltage restorer (UDVR). By controlling the switching tube in the APFC circuit, the harmonic injected into the system by the rectifier can be suppressed and the power factor of the power grid can be increased to approximately 1. The single-phase APFC circuit adopts the double closed loop control strategy of voltage outer loop and current inner loop, the control circuit is simple and the cost is low. The inverter adopts the open-loop control strategy and the compensation strategy adopts the same-phase voltage compensation strategy. The results of MATLAB simulation show that the continuously running dynamic voltage restorer based on APFC circuit can continuously compensate the voltage sag and make the load obtain pure sinusoidal input voltage.