Unified Analysis and Output Estimation for a Strong Coupling Contactless Slipring System
作者机构：the Jiangsu Key Laboratory of New Energy Generation and Power ConversionNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Physics and Electronic Electrical EngineeringHuaiyin Normal UniversityHuai’an 223300China
出 版 物：《CSEE Journal of Power and Energy Systems》 (中国电机工程学会电力与能源系统学报（英文）)
年 卷 期：2023年第9卷第6期
页 面：2263-2271页
核心收录：
学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 07[理学] 0701[理学-数学]
基 金：the National Natural Science Foundation of China under Grants 51677086 and 51777093.
主 题：Contactless slipring(CS) precise output estimation unified analysis
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 k0.4 . 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.
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