An active filtering strategy of LCL filter for inverter power supply of electromagnetic pump

• Published in: Journal of physics. Conference series Vol. 2530; no. 1; pp. 12001 - 12007
• Main Authors: Zhao, Jiawei, Liu, Shichao, Yang, Shuaifei, Wang, Changhuan, Li, Yang, Wu, Chunyu, Liu, Yang
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.06.2023
• Subjects: Filtration; Inverters; Physics; Resonance
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2530/1/012001

Abstract The inverter power supply for an electromagnetic pump is a motor controller based on a three-phase inverter. This inverter needs to be followed by an LCL filter as a filter for connecting the electromagnetic pump. But the LCL filter has a large resonance spike at the resonance point. This can cause relatively large interference to the control system and also increase the harmonics of the inverter power supply output current. Therefore, it is necessary to suppress the resonant spikes of the LCL filter. In this paper, an active filtering strategy based on a trap is proposed by comparing the existing passive filtering strategies. The trap can be used to generate an anti-resonant peak at the resonance point of the LCL, which is used to cancel the resonant spike of the LCL filter. This method ensures the resonant peak suppression effect without affecting the filtering effect of the LCL filter.