带中点电位波动的Vienna整流器改进SVPWM策略

Improved SVPWM Strategy for Vienna Rectifier With Midpoint Potential Fluctuation

为提高直流侧电容值较小时Vienna整流器的输入电流波形质量,此处探究了Vienna整流器中点电位波动对空间电压矢量脉宽调制(SVPWM)造成的影响,推导了中点电位波动值与矢量图中小矢量、中矢量和大矢量的误差值之间的关系,并在此基础上提出了一种改进空间电压矢量调制策略。该策略计算出中点电位波动值与消除该矢量误差所需的修正量之间的关系,得到正确的矢量作用时间。最后搭建了1000 W的Vienna整流器仿真与实验平台进行验证。仿真和实验结果验证了该策略的正确性与有效性。

In order to improve the input current waveform quality of the Vienna rectifier under the situation of low capacitance of the DC side,the influence of the midpoint potential fluctuation of the Vienna rectifier to the space vector voltage pulse width modulation(SVPWM)is studied.The relationship between the midpoint potential fluctuation value and the error value of the small vector,the medium vector and the large vector in the vector diagram is derived,and an improved space voltage vector modulation strategy is proposed on this basis.The relationship between the midpoint potential fluctuation value and the correction required to eliminate the vector error is calculated in this strategy,and the correct vector action time is obtained.Finally,a 1000 W Vienna rectifier simulation and experiment platform are built for verification.Simulation and experimental results verify the correctness and effectiveness of the strategy.