单相PWM整流器输出2次谐波电压抑制方法

A Control Scheme to Suppress Second Harmonic Voltage for Single-phase PWM Rectifier

单相电压型脉宽调制(PWM)整流器直流输出电压存在2倍于电网频率的谐波分量,该谐波分量会严重恶化整流器静、动态性能,采用谐波电流补偿电路,抑制该谐波分量。谐波电流补偿电路是由两个电力电子开关器件和一个电感、电容组成的Boost-Buck变换电路,通过对开关器件的有效控制,实时补偿整流器输出直流侧2次谐波电流,从而达到抑制输出2次谐波电压的目的。最后,搭建了谐波电流补偿电路,在单相PWM整流器上验证了该方法的正确性和有效性。

In single-phase pulse width modulation（PWM） rectifiers, direct current bus voltage contain second harmonic component.The component could seriously deteriorate the system performance.Harmonic current compensation circuit can mitigate the harmonic component.The compensation circuit is a Boost-Buck converter with a capacitor and inductance.Through the effective control of switching devices, harmonic current on the direct current bus can be compensated instantaneously, so the purpose of suppress second harmonic of direct current bus voltage is achieved.Construction of the harmonic current compensation circuit and single-phase PWM rectifier prototype verify the correctness and validity of the method.