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对于中点箝位式三电平有源电力滤波器,建立了中线电流与中线电压的定量数学模型。基于上述模型,提出了一种三电平中点电位控制方法。通过引入表示中线电流与电容中点电位关系的系数,可以根据上下电容电压差直接计算出注入的中线电流的合理值。同时通过合理选择滤波器参数与采样频率,可以抑制该方法对于APF补偿效果的影响。仿真与实验研究结果表明,该方法在基本不影响补偿效果的同时可消除中点电位不平衡。
For mid-point clamped three-level active power filter, a quantitative mathematical model of mid-line current and mid-line voltage is established. Based on the above model, a three-level midpoint potential control method is proposed. By introducing a factor that indicates the relationship between the neutral current and the mid-point potential of the capacitor, a reasonable value of the injected neutral current can be calculated directly from the voltage difference between the upper and lower capacitors. At the same time, by choosing the filter parameters and the sampling frequency rationally, the influence of this method on the APF compensation effect can be suppressed. Simulation and experimental results show that this method can eliminate the neutral point potential imbalance without affecting the compensation effect.