三相三线并联型有源电力滤波器并联控制

A Parallel Control Strategy of Three-phase Three-wire Shunt Active Power Filters

针对有源电力滤波器(APF)在大功率领域应用的问题,提出了一种适合于三相三线APF的并联运行策略,根据APF自身容量用优化输出方式补偿谐波电流,以达到大容量APF多补偿、小容量APF少补偿的目的,保证了多台APF并联运行的可行性和安全性。在此基础上提出了APF的并联控制策略,根据实际负载谐波电流投切APF。仿真和实验证明了基于容量极限负载按比例分配的有效性,以及协调控制策略在多台APF并联运行时的可行性。

For the purpose of actual applications of large capacity active power filter （APF）, this paper proposes a control strategy to make three-phase three-wire APFs work in parallel. The APFs operate independently and have the capacity-maximum function of compensating load harmonics. Furthermore, the output current of the APFs is optimized up to capacity maximum, so that large capacity APFs compensate more, and small ones compensate less. In this way, the feasibility and security of paralleled running of APFs can be guaranteed. The control strategies for APFs＇ switching is also proposed to ensure APFs switch corresponding to actual load harmonic currents and impact slightly to system. In the end, the simulation and experiment testify the validity of proportion compensation capacities based on capacity limit of APFs and the feasibility of coordination control strategy for parallel running of APFs.