期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 38, 期 10, 页码 11763-11775出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2023.3279659
关键词
Accurate modeling; load estimation; parameter design; wireless power transfer (WPT)
Modeling is necessary for designing and controlling a wireless power transfer (WPT) system. First harmonic analysis (FHA) is a simple and effective method, but its accuracy may be affected by load variations. This article analyzes harmonics in the primary side of an LCC-S compensation network based WPT system, providing a more accurate waveform model of the inverter's output current compared to the FHA-based method. Time-domain analysis is also conducted in the secondary side to derive an equivalent input impedance with nonlinear characteristics.
Modeling of the wireless power transfer (WPT) system is the premise to design and control it. First harmonic analysis (FHA) is a simple and effective method to model theWPT system, but its accuracy may decrease with the variation of load in a wide range. In this article, harmonics are analyzed in the primary side of an LCC-S compensation network based WPT system, depicting a waveform of the output current of the inverter much closer to the real one compared with FHA-based model. In the secondary side, the time-domain analysis is conducted both in continuous conduction mode and discontinuous conduction mode of the rectifier, deriving an equivalent input impedance featuring the nonlinear characteristics of the system. Based on the proposed model, the parameters of the LCC network are designed, proving to tune the ZVS condition better than the FHA-based method. Finally, the load of the system is estimated, achieving a high accuracy (with the estimating error less than 5%) in a wide range with a simple sampling method.
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