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传统有源电力滤波器(active power filter,APF)基于逆变器拓扑,直流侧采用大容量电解电容器组作为储能元件,容易损坏,且价格昂贵。提出一种基于推挽正激式高频隔离交交变换器(insolated high frequency push-pull forward AC-AC converter,IHF-PPFAC)的IL-APF(inverter-less APF)结构,无需储能装置。分析了基于偶次谐波调制技术(even harmonic modulation,EHM)的单相IHF-PPFAC综合补偿原理;对补偿注入电流进行傅里叶级数分解分析其频谱特性,发现EHM耦合问题并提出非相邻调制波的解决方案;提出三相IL-APF结构,并建立了数学模型;同时设计了逐次谐波补偿策略(successive harmonic compensation strategy,SHCS)的闭环控制方案。仿真和实验结果验证了IL-APF的可行性,新装置没有使用直流储能元件,并实现了补偿电容器和电网侧的电气隔离;具有无功和谐波的综合补偿功能,适用于三相三线平衡系统。
The traditional active power filter (APF) is based on the inverter topology, and the DC side adopts a large-capacity electrolytic capacitor bank as an energy storage component, which is easily damaged and expensive. An inverter-less APF structure based on an insolated high frequency push-pull forward AC-AC converter (IHF-PPFAC) is proposed, which requires no energy storage device. The principle of single-phase IHF-PPFAC synthesis compensation based on even harmonic modulation (EHM) is analyzed. The Fourier transform decomposition of compensation current is analyzed to find out the characteristics of EHM coupling, and the nonphase The solution of the adjacent modulation wave is proposed. The three-phase IL-APF structure is proposed and a mathematical model is established. At the same time, a closed-loop control scheme of successive harmonic compensation strategy (SHCS) is designed. Simulation and experimental results verify the feasibility of IL-APF, the new device does not use the DC energy storage element, and to achieve the compensation capacitor and the grid side of the electrical isolation; with reactive power and harmonic comprehensive compensation for three-phase three-wire Balance system.