Unified Analysis and Output Estimation for a Strong Coupling Contactless Slipring System  

作　　者：Guangming He Qianhong Chen Xiaoyong Ren Zhiliang Zhang 

机构地区：[1]the Jiangsu Key Laboratory of New Energy Generation and Power Conversion,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]School of Physics and Electronic Electrical Engineering,Huaiyin Normal University,Huai’an 223300,China

出　　处：《CSEE Journal of Power and Energy Systems》2023年第6期2263-2271,共9页中国电机工程学会电力与能源系统学报（英文）

基　　金：the National Natural Science Foundation of China under Grants 51677086 and 51777093.

摘　　要：A contactless slipring (CS) system utilizing inductive-power-transfer (IPT) technology is a good candidate for traditional mechanical slipring assemblies. However, suffering from the high harmonic currents in strong coupling CS systems, the output power will deviate from the theoretical values estimated by the fundamental harmonic approximation (FHA) and its extension method, i.e., E-FHA, in which the power is transferred by both the fundamental current and the high order harmonic currents. In order to achieve high precise output estimation, a unified analysis is proposed in this paper. First, “Fundamental-harmonic Double Resonance Phenomenon” is revealed via impedance analysis, to address the nature of the high harmonic currents in strong coupling systems. Then, a unified output current expression owning high precision is derived, and followed by a unified fundamental load impedance. Discussions show that both the output and the fundamental load impedance of FHA, and E-FHA are the special cases of the unified expressions proposed. FHA and E-FHA are precise enough for the loose coupling system, whereas the proposed method is indispensable for the strong coupling system with k>0.4 . Finally, simulations and experimental measurements of a 1.6kW CS system, as well as the comparative studies related to FHA, E-FHA, and the proposed method, are presented, indicating that the proposed method is effective for high precise output estimation.

关 键 词：Contactless slipring(CS) precise output estimation unified analysis 

分 类 号：O17[理学—数学]