大功率低成本新型混合型有源滤波器的电流检测方法

Detecting current method of new high capacity hybrid active power filter with low cost

提出一种逆变器采用三相四开关结构的大功率新型混合型有源滤波器,这种结构的滤波器适用于中高压系统的无功补偿和谐波抑制。给出了系统的拓扑结构,对三相四开关逆变器的结构原理进行了分析。提出了一种单相电流的谐波检测方法和基于能量平衡的直流侧电流的检测方法,这种检测方法计算时间显著减少,系统只需检测两相电流和控制四个开关元件。将基于三相四开关逆变器的新型混合型APF进行仿真实验,仿真结果表明,提出的滤波装置具有良好的谐波波抑制和无功补偿性能,直流侧电压平衡稳定,而且大大降低了整个装置的成本和功耗。

This paper proposed a new high capacity hybrid active power filter with 3-phase 4-switch inverter,which could be applied in high grid system.Analyzed the topology structure of the given system and the inverter.Proposed an improved detecting harmonic current method based on single current detection,which just decreased computing time greatly.Presented a detecting DC link current method based on energy balance.The system detected two-phase currents and controlled 4 switches.Simulated the new hybrid APF based on the inverter of 3-phase 4-switch.The results show that the filtering equipment based on the inverter of 3-phase 4-switch can suppress harmonics and compensate reactive power well.The DC link voltage is kept stable and balance.The cost and loss of the new filtering equipment are decreased greatly.