并联逆变系统谐波环流的抑制方法及功率计算

Suppression Method and Power Calculation of Harmonic Circulation for Parallel Inverters

为了抑制并联逆变系统的谐波环流,提高系统的电压输出质量,分析了谐波环流产生的原因,利用下垂特性将谐波功率环引入系统控制,并基于此提出多反馈并联控制策略及其参数设计方法,并采用更加实时的谐波环流功率计算方法,实现基波及主要次谐波的功率均分,有效抑制谐波环流。实验结果证明,基于新的谐波功率计算的多反馈并联控制策略能更好地抑制谐波环流。提高并联逆变系统的电压输出质量。

To suppress harmonic circulation of parallel inverters system and improve the output voltage quality, the caus- es of the harmonic circulation are analyzed, harmonic power loop into system controller is introduced based on droop control characteristic ,the parallel control strategy and the parameter designed method are proposed.The more real- time,the improved power calculation method shares the fundamental and major sub-harmonic power（active power as we-ll as reactive power） evenly,and suppresses harmonic circulation effectively.The experimental results show that the multiple feedbacks parallel control strategy based on new harmonic power circulation can suppress harmonic circula- tion more effectively and improve the output voltage quality of parallel inverters.