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带基波电流旁路通道的串联混合有源电力滤波器为电网电流中的基波成分提供了一个无源通道,因而可以大大降低有源部分的容量。然而,原有的基于pq理论的控制方法在负载或电网不平衡时,基波旁路通道和逆变器之间会发生基波谐振,使得逆变器仍然会流过大量的基波电流。逐相dq变换法可以完整地将基波或谐波检测出来。文中提出了基于逐相dq变换的控制方法,使得不论电网电压和负载电流是否平衡,基波旁路通道和逆变器之间均不会发生基波谐振现象,逆变器只需承担电网谐波电流和提供谐波电压,提高了系统的性价比。5 kW的模型试验证明了新方法的可行性。
A series hybrid active power filter with a fundamental current bypass channel provides a passive path to the fundamental component of the grid current, thus greatly reducing the active part capacity. However, the original control method based on pq theory, when the load or grid is unbalanced, will cause fundamental resonance between the fundamental bypass path and the inverter, so that the inverter will still flow a large amount of fundamental current. Phase-by-phase dq transform method can be completely detected fundamental or harmonics. In this paper, a control method based on phase-by-phase dq transformation is proposed, so that no fundamental resonance phenomenon occurs between the fundamental bypass path and the inverter, no matter whether the grid voltage and the load current are balanced or not, Wave current and harmonic voltage, improve the system cost. The 5 kW model test proved the feasibility of the new method.