Abstract
In the bidirectional LCL type Inductively coupled power transfer (ICPT) system; there are a lot of harmonics in the output current of the primary and secondary side inverter bridge. In order to solve the harmonic problem of bi-directional ICPT system, this paper firstly analyzes the harmonic of bidirectional LCL type ICPT, obtains the proportion of each harmonic amplitude to the fundamental amplitude, and determines the third harmonic as the main harmonic. Secondly, the harmonic elimination method of back injection method is applied to bidirectional ICPT system. After the parameters of frequency selection network are determined by calculation, Matlab / Simulink circuit simulation is built to analyze the output current of primary and secondary sides of bidirectional LCL ICPT system before and after adding frequency selection network and back injection channel. The conclusion shows that in the bidirectional ICPT system, Harmonic extraction and anti-injection method also has visible fixed harmonic elimination effect.
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