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由于功率器件耐压水平的限制,传统的2电平拓扑结构有源电力滤波器(APF)难以实现对高压非线性负载的谐波补偿。文中采用二极管钳位型多电平变换器,提出了其作为APF运行的方案。对该APF进行了理论分析,提出一种基于重复预测型观测器的无差拍控制方案。该方案采用重复预测型观测器,对指令谐波电流进行预测,可在相同的采样频率下提供更精确的谐波电流预测值,因而可以改善整个系统的控制效果。仿真结果表明该APF适用于高电压及大容量谐波补偿。
Due to the limitation of the withstand voltage level of the power device, the conventional 2-level APF is difficult to achieve the harmonic compensation for the high voltage non-linear load. In this paper, a diode-clamped multi-level converter is proposed in this paper as a solution for APF operation. A theoretical analysis of this APF is made and a no beat control scheme based on repeated predictive observer is proposed. This scheme uses a repeated predictive observer to predict the commanded harmonic current, which provides more accurate predictions of harmonic currents at the same sampling frequency, thus improving the overall system control performance. Simulation results show that the APF is suitable for high voltage and high-capacity harmonic compensation.