Abstract：Single-phase DC link series active power filter is a newly developed harmonic correction method for single-phase diode rectifier. The dc link series active power filter is composed of a hybrid full-bridge inverter which includes high-frequency and low-frequency working fully-controlled power devices and power diodes, and is series between the dc terminal of the diode rectifier and the dc load, and also features with the property of voltage stepping-down. Application of average current control to this type of active power filter will be benefit for digital control. The control performance with average current control is evaluated firstly. The results show that the line current waveforms have large distortion at the low-frequency switching points due to large duty-ratio variation requirement between 0 and 1 before and after the low-frequency transition points. In order to overcome this current waveform distortion problem, a hybrid control scheme is proposed in this paper. Leading-edge and trailing-edge modulation are employed in different time intervals, and then the requirement of the fast response speed of modulation signal is relaxed and the control performance is enhanced greatly. Experimental results of the original average current control and the hybrid approach are compared and show good improvement of the line current performance.
杜雄, 周雒维, 李子东. 复合控制单相直流侧串联型有源电力滤波器[J]. 电工技术学报, 2012, 27(7): 221-226.
Du Xiong, Zhou Luowei, Li Zidong. Hybrid Control of Single-Phase DC Link Series Active Power Filter. Transactions of China Electrotechnical Society, 2012, 27(7): 221-226.
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