基于改进重复预测原理的并联有源电力滤波器无差拍控制策略

为了使有源电力滤波器(APF)能够快速的、高精度的输出补偿谐波,针对APF主电路的控制方法,该文提出一种改进的基于重复预测原理的无差拍控制算法。该文首先介绍了并联型有源电力滤波器的工作原理,其次建立了三相并联型有源电力滤波器的数学模型,并根据其数学模型分析了无差拍控制的工作原理。最后通过无差拍控制的工作原理可知谐波电流指令信号的预测是决定无差拍控制效果的关键。为了进一步提高使用无差拍控制时的APF滤波效果,根据谐波的周期性,该文采用改进的重复预测策略对下一拍输出电流预测,并且分析了这种预测方法的稳定性。此改进的重复预测无差拍控制策略能够提高稳态时的预测精度和暂态时的响应速度。仿真波形分析与试验结果分析证明了其可行性。

Deadbeat control strategy of shunt active power filter based on repetitive predictor theory

In order to make the active power filter (APF) can fast and precisely output compensation harmonic, this paper presented an improved deadbeat control algorithm based on repetitive prediction principle for APF's main circuit. This paper firstly introduced the working principle of the parallel active power filter, secondly established the mathematical model of the three-phase shunt active power filter and analyzed deadbeat control principle according to mathematical model. Finally it is known that harmonic instruction current signal prediction is the key to determining the deadbeat control effect, through the deadbeat control principle. In order to improve APF's filtering effect with the deadbeat control method, the improved repetitive prediction strategy was employed to predict the next beat output current according to the harmonic periodicity, and its stability was analyzed. This improved repetitive predictive deadbeat control strategy can improve the steady precision and transient response speed. Simulation waveform analysis and experimental results analysis proved the feasibility of the control strategy.