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机载中频有源电力滤波器(active power filter,APF)的谐波补偿效果直接取决于其电流控制环的带宽。基于APF系统中各个控制任务对带宽要求的深入分析,提出一种多分辨率控制策略,以充分合理利用数字信号处理器(digital signal processor,DSP)资源,以期最大限度提高电流环带宽、改善补偿效果。首先分析控制延时对电流环带宽影响,确定最大允许的控制延时时间。以此为依据,将控制任务分成高低频两类,通过第n个高频控制周期的拓展,把低频控制周期嵌入其中,解决了DSP计算资源不足的难题。研制了一台20kVA实验样机,实验结果证明控制的有效性和正确性,并且系统具有良好的动态性能。
The harmonic compensation effect of the airborne active power filter (APF) directly depends on the bandwidth of the current control loop. Based on the in-depth analysis of the bandwidth requirements of various control tasks in the APF system, a multi-resolution control strategy is proposed to make full and rational use of the digital signal processor (DSP) resources to maximize the current loop bandwidth and improve the compensation effect. First of all, analyze the effect of control delay on current loop bandwidth and determine the maximum allowable control delay time. Based on this, the control tasks are divided into high frequency and low frequency. Through the expansion of the nth high frequency control cycle, the low frequency control cycle is embedded therein, which solves the problem of insufficient DSP computing resources. A 20kVA experimental prototype was developed. The experimental results prove the effectiveness and correctness of the control, and the system has good dynamic performance.