A Maximum Efficiency Point Tracking Control Scheme Based on Different Cross Coupling of Dual-Receiver Inductive Power Transfer System

Ruikun Mai,Linsen Ma,Guangzhong Cao,Yeran Liu,Pengfei Yue,Zhengyou He

doi:10.3390/en10020217

Ruikun Mai, Linsen Ma + Show 4 more

Open Access

https://doi.org/10.3390/en10020217

Copy DOI

Journal: Energies	Publication Date: Feb 13, 2017
Citations: 13	License type: CC BY 4.0

Affiliation: Southwest Jiaotong University, Shenzhen University

Abstract

One of the most promising inductive power transfer applications is the wireless power supply for locomotives which may cancel the need for pantographs. In order to meet the dynamic and high power demands of wireless power supplies for locomotives, a relatively long transmitter track and multiple receivers are usually adopted. However, during the dynamic charging, the mutual inductances between the transmitter and receivers vary and the load of the locomotives also changes randomly, which dramatically affects the system efficiency. A maximum efficiency point tracking control scheme is proposed to improve the system efficiency against the variation of the load and the mutual inductances between the transmitter and receivers while considering the cross coupling between receivers. Firstly, a detailed theoretical analysis on dual receivers is carried out. Then a control scheme with three control loops is proposed to regulate the receiver currents to be the same, to regulate the output voltage and to search for the maximum efficiency point. Finally, a 2 kW prototype is established to validate the performance of the proposed method. The overall system efficiency (DC-DC efficiency) reaches 90.6% at rated power and is improved by 5.8% with the proposed method under light load compared with the traditional constant output voltage control method.

Highlights

In recent years, inductive power transfer (IPT) technology has made rapid progress [1,2]
For high power applications [5,6], it is a huge challenge for the single-receiver IPT system to get enough power from the transmitter other than from multiple-receiver systems, which could dramatically increase the capacity of receiving power
In multiple-receiver applications for railway transportation, the mutual inductances between between the transmitter coil and different receiver coils vary as the trains move along the track

Summary

Introduction

Inductive power transfer (IPT) technology has made rapid progress [1,2]. IPT technology can transfer energy over an air gap of a certain size via a high frequency magnetic field. For high power applications (rail locomotives, electric cars, buses and other hybrid electric vehicles) [5,6], it is a huge challenge for the single-receiver IPT system to get enough power from the transmitter other than from multiple-receiver systems, which could dramatically increase the capacity of receiving power. The limitation of semiconductor devices’ capacity makes it hard for a traditional single-receiver IPT system to meet the heavy load demand. The multiple-receiver approach may be a promising solution to meet the high power demands of railway charging applications. A long transmitter track is usually employed to generate high magnetic fields in IPT systems for railway

Methods

Results

Conclusion