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对内层控制采用PWM控制的有源电力滤波器(active power filter,APF),当检测部分采用2步预测修正时,在负载较重时能够取得较好效果,但在负载较轻时APF的补偿效果较差。该文对其产生机理进行分析,指出APF系统满足鲁棒稳定性与满足干扰抑制性能对控制增益的要求是矛盾的,在负载较轻时要想取得较好的控制效果往往需要较大的控制增益,使矛盾更加凸显。为进一步提高APF的补偿效果特别是轻载下时,提出嵌入预测控制,将APF系统化成无时滞的系统,从而扩大了满足系统鲁棒稳定性的控制增益的取值范围。在此基础上,考虑实际中传感器可能受到的噪声的影响,采用鲁棒H2/H∞混合控制的方法设计控制器增益使得系统在参数摄动、随机干扰、死区干扰等影响下依然能取得较好的效果。最后,通过仿真实验和物理实验证明了所做分析的正确性和所提方法的有效性。
The active power filter (PWM) controlled active power filter (APF) is used for the inner control. When the detection part adopts the two-step prediction correction, the better effect can be obtained when the load is heavy. However, when the load is light, APF Compensation effect is poor. In this paper, the generation mechanism is analyzed. It is pointed out that the APF system meets the requirements of robust gain and disturbance rejection to control the gain. It is often contradictory to control the gain when the load is light. Gain, make contradiction more prominent. In order to further improve the compensation effect of APF, especially at light load, an embedded predictive control is proposed to systematize the APF into a system without delay, thus expanding the range of control gain satisfying the robust stability of the system. Based on this, considering the actual noise of the sensor, the robust H2 / H∞ hybrid control method is used to design the controller gain so that the system can still obtain under the influence of parameter perturbation, random interference and dead-zone interference Better effect. Finally, the correctness of the analysis and the effectiveness of the proposed method are proved through simulation experiments and physical experiments.