PR控制在APF纹波电压控制中的应用研究

Application Research on PR Control in APF Ripple Voltage Control

针对有源电力滤波器(APF)直流侧纹波电压存在会直接影响直流侧电容值的选取问题,以提高控制精度、减少直流侧电压纹波为目标,提出了一种APF直流侧纹波电压比例谐振(PR)控制方法,同时采用了一种改进的i_p-i_q谐波检测法。改进法将低通滤波器(LPF)用积分延时增益模块代替,增加了谐波滤除的精度,提高了系统控制进度。PR控制法利用所加入的谐振环节,使PR控制器在跟踪电流指令时,可消除稳态误差,从而减少纹波电压,在实际工程应用中解决了直流侧电容的选取问题。最后对所提方法进行了仿真和实验验证。

For the existence of the DC side active power fiher（APF） ripple voltage will directly affect the selection of DC side capacitor value problems, in order to improve the control precision, and reduce the DC side voltage ripple as the goal,put forward a kind of DC side APF ripple voltage proportional resonant（PR） control method,using an impr- oved ip-iq harmonic test at the same time.Improved ip-iq harmonic test is instead of low pass filter（LPF） with integral delay gain module, increase the precision of harmonic filter, improve the system control precision.PR control method is used to join the resonant link, make PR controller in tracking the current instruction, can eliminate the steady-state error, thus reducing the ripple voltage, and solving the problem of the selection of the DC side capacitor in the actual engineering application.At last, a simulation experiment is done to verify the principle above.