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针对有源滤波器电流谐波分量检测运算复杂,且在负荷电流变化时出现电源电流畸变现象,从直流侧电容电压与交、直流侧功率传递的关系出发,并结合有功电流的周期性特点,提出了基于直流侧电容电压周期离散控制的新型有源滤波器控制方法。该方法以电网电压为同步信号,在电网电压信号的过零点采样直流侧电容电压,并通过周期离散控制可以获得负荷电流有功分量。采用该周期离散控制方法可实现对直流侧电容电压的线性化控制,并使有源滤波器对谐波的补偿是瞬时的。该文给出了单相并联有源滤波器的直流侧模型,基于该模型推导出周期离散控制方法。以该方法研制了10kVA有源滤波器样机,仿真和实验结果表明该方法控制简单,稳定性好,谐波补偿速度快,能够有效地避免负荷变化时的电流畸变现象。
Aiming at the complex operation of detection and detection of current harmonic components in active filters and the distortion of supply current during load current changes, starting from the relationship between DC capacitor voltage and power transfer at AC and DC sides, combined with the periodicity of active current, A new active filter control method based on discrete control of DC capacitor voltage is proposed. The method takes the grid voltage as the synchronization signal, samples the DC capacitor voltage at the zero-crossing of the grid voltage signal, and obtains the active component of the load current through the period discrete control. The periodic discrete control method can be used to realize the linear control of the DC side capacitor voltage and to make the active filter compensate for the harmonics instantaneously. In this paper, the DC-side model of single-phase shunt active power filter is given. Based on this model, a periodic discrete control method is derived. The prototype of 10kVA active filter was developed by this method. The simulation and experimental results show that this method has the advantages of simple control, good stability and fast harmonic compensation, which can effectively avoid the current distortion when the load changes.