A hybrid wireless PLL for phase shift control based maximum efficiency point tracking in resonant wireless power transmission systems | IEEE Conference Publication | IEEE Xplore

A hybrid wireless PLL for phase shift control based maximum efficiency point tracking in resonant wireless power transmission systems


Abstract:

The application of Wireless Power Transfer (WPT) systems is primarily limited by its energy transfer efficiency. For modern WPT that utilises Strongly Coupled Magnetic Re...Show More

Abstract:

The application of Wireless Power Transfer (WPT) systems is primarily limited by its energy transfer efficiency. For modern WPT that utilises Strongly Coupled Magnetic Resonances (SCMR), which transfers energy by using the mutual inductance between coils, a higher efficiency can be achieved compared with a conventional air-core transformer module. An SCMR normally works at a desired frequency which is typically the self-resonant frequency of the receiver. However, this frequency varies during system operation where a changing environment, moving coil positions and variable loads may occur. In this paper, a hybrid wireless Phase Lock Loop (PLL) is proposed to lock the phase difference between the WPT's transmitting current and receiving voltage, at which point the system achieves maximum efficiency. A prototype WPT system is built verifying that the proposed wireless PLL effectively controls the wireless power system and operates at optimal frequencies under varying conditions.
Date of Conference: 29 October 2017 - 01 November 2017
Date Added to IEEE Xplore: 18 December 2017
ISBN Information:
Conference Location: Beijing, China

I. Introduction

During recent decades, distributed power generation and storage technologies have been increasingly considered, such as distributed solar farms and large-scale battery energy storage [1]–[3]. In order to interface generated power to the national grid, high voltage grid-connected inverters have been widely used in those distributed generation systems. To protect both the national grid and the end user, the thermal performance and electrical characteristics of the HV side need to be measured and analysed. However, a series of technical problems need to be solved when applying those monitoring methods into a distributed generation system. In a commonly-used system, the bus bar temperature and HV phase angle are normally considered as the critical parameters. For a high-end industrial application, the bus-bar temperature can be measured by infrared temperature sensor and thermometer [4]. However, the poor accuracy, cost and isolation requirement makes this less desirable for distributed generation systems.

References

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