Discussion on the method of low-frequency ripple suppression of single-phase inverter
Cai Gaochao1,2, Huang Yanyao1,2, Chen Yiwen1,2
1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350116; 2. Fujian Provincial Key Laboratory of New Energy Power Generation and Energy Conversion (Fuzhou University), Fuzhou 350116
Abstract：The input side of single-phase inverter often has low frequency pulsation current, which needs to be filtered by large electrolytic capacitor. In order to obtain better filtering effect and improve the service life of the filter, it is necessary to use power decoupling technology to solve the problem caused by low frequency ripple. At present, the low-frequency ripple suppression methods of single-phase inverters reported in literature can be roughly divided into four cases: DC power decoupling, two-stage power decoupling, AC power decoupling and three-port power decoupling. This paper introduces the circuit topology, decoupling effect, control strategy and circuit parameters, compares and evaluates the above technologies, summarizes the advantages and disadvantages of each power decoupling technology, and seeks a reasonable idea for future power decoupling research.
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2019, Vol. 20 
