Dynamic Improvement of Series–Series Compensated Wireless Power Transfer Systems Using Discrete Sliding Mode Control

• Published in: IEEE transactions on power electronics Vol. 33; no. 7; pp. 6351 - 6360
• Main Authors: Yang, Yun, Zhong, Wenxing, Kiratipongvoot, Sitthisak, Tan, Siew-Chong, Hui, Shu Yuen Ron
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-07-2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Communications systems; Computer simulation; Control; Current injection; Discrete sliding mode control (DSMC); dynamic performance; Electric converters; Electric potential; Energy conversion efficiency; Energy efficiency; hill-climbing-search-based phase angle control; Impedance; maximum energy efficiency (MEE); Proportional integral; Receivers; series–series compensated wireless power transfer (WPT) system; Sliding mode control; Tracking control; Transmitters; Voltage control; Wireless power transfer; Wireless power transmission
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2017.2747139

This paper presents a discrete sliding mode control (DSMC) scheme for a series-series compensated wireless power transfer (WPT) system to achieve fast maximum energy efficiency (MEE) tracking and output voltage regulation. The power transmitter of the adopted WPT system comprises a dc/ac converter, which incorporates the hill-climbing-search-based phase angle control in achieving minimum input current injection from its dc source, thereby attaining minimum input power operation. The power receiver comprises a buck-boost converter that emulates an optimal load value, following the MEE point determined by the DSMC scheme. With this WPT system, no direct communication means is required between the transmitter and the receiver. Therefore, the implementation cost of this system is potentially lower and annoying communication delays, which deteriorate control performance, are absent. Both the simulation and experiment results show that this WPT system displays better dynamic regulation of the output voltage during MEE tracking when it is controlled by DSMC, as compared to that controlled by the conventional discrete proportional-integral (PI) control. Such an improvement prevents the load from sustaining undesirable overshoot/undershoot during transient states.