基于三相全桥逆变器的DVR单周控制策略研究

提出了一种基于三相全桥逆变器的三相四线系统动态电压调节器DVR(Dynamic Voltage Regulator)的单周控制策略,建立了单周控制模型。该模型采用2个积分器,分别完成在三相电压正半周和负半周的积分,积分器输出送到比较器与电源相电压采样值和参考信号的差比较,其输出决定了6个R-S触发器的状态,经驱动器实现对12个开关的控制。该模型可以对三相电源的骤变进行独立补偿。对所建立的模型就电压骤降和骤升、电源不对称以及对电源中含有谐波等情况进行了仿真验证。结果表明,该模型对电源电压有很好的补偿效果且对电源谐波有很好的抑制作用。

Study on one-cycle control of DVR based on three -phase full -bridge inverter

A one-cycle control strategy for DVR(Dynamic Voltage Regulator) in three-phase four-wire systems is presented and a one-cycle control model is proposed.The model applies two integrators working during the positive half cycle and negative half cycle respectively.The output of integrator is led to comparator to compare with the deviation of sampled phase voltage from reference voltage,and the outputs of comparators then set the states of 6 R-S flip-flops,which control 12 switches via drivers.The model compensates the sudden changes of three-phase electric sources independently.The established model is tested by the simulations of voltage sag and jump,unbalanced three-phase voltages,source voltage with harmonics,etc..Simulation results show that the proposed model has good performance in voltage compensation and harmonic suppression.