适用于变频航空电网的高性能五电平有源滤波器及其控制

High Performance Five-Level Active Filter Applicable to Variable Frequency Aircraft Grid and Its control

新一代飞机电源系统为变频系统,其中的谐波具有频带宽、频率高的特点,对航空有源滤波器的性能提出了挑战。本文率先研究基于级联型拓扑的并联型航空有源滤波器,配合载波相移PWM调制策略,以较低的开关频率达到较高的补偿带宽,有利于满足航空变频电网的谐波补偿要求。文中分析了典型非线性航空负载的谐波特性,介绍了有源滤波器直接控制电网电流的原理,阐述了新型航空有源滤波器的系统架构,研究完善了其控制策略,进行了变频电源条件下的仿真分析并成功研制了样机系统,仿真和实验结果表明了五电平航空有源滤波器优异的综合性能。

The harmonics in the next-generation variable frequency aircraft power system have the features of wide frequency band and high frequency, which challenges the performance of aeronautic active power filter（AAPF）. In this paper, a cascade topology based shunt aeronautic active filter is proposed and studied. With the carrier phase shifting PWM techniques, the cascaded AAPF can reach a wide compensation band using a relatively low frequency, so that it can meet the requirements of the variable frequency aircraft power system. The APF operation principle of controlling the source current directly is introduced. The system construction of the cascaded AAPF is shown and its control strategy is described in detail. At last, the simulation under variable frequency and experimental results illustrate the good compensation performance of the cascaded AAPF.