基于DSP的有源电力滤波器控制器

DSP-based controller of the active power filter

分析了有源电力滤波器(APF)的工作原理,设计了其控制器。采用基于瞬时无功功率理论的d-q检测法得到APF的谐波指令电流,由于传统滞环控制其滞环宽度是固定的,则开关器件的频率不固定。本文采用定频滞环电流控制方法,该方法实现简单、精度较高且响应速度快,同时受负载参数变化的影响较小,鲁棒性好;相比较于其它常用的脉冲宽度调制技术,本文脉冲信号的产生采用具有算法简单、适用于数字实现、开关损耗小以及硬件电路简单等特点的空间矢量方法。最后给出了基于DSP的有源电力滤波器控制器的实现过程,并给出了采用此控制器的APF的部分实验结果。

The working principle of APF is analyzed and its＇ controller is designed in this paper. The referenced harmonic current of APF is obtained via dq detection based on instantaneous reactive power theory. The frequency of switching device is not fixed because of the fixed hysteresis width of traditional hysteresis control. The fixed-frequency hysteresis current control method is applied in this paper, which has the characteristics such as the simple application method, the high accuracy, the fast response, the small impact by load parameters, as well as strong robust etc. Compared with the other common pulse width modulation technology, Space Vector PWM is applied in this pulse signal generation system, which has the characteristics such as the simple algorithm, the easy digital realization, the small switching losses, as well as the simple hardware circuit etc. Finally, the implementation process of DSP-based controller APF and the experimental results are given. It is shown by the experiments that the APF controller introduced can meet the control requirements of the device and improve its response speed.