Hybrid control of capacitive power transfer system for coupling capacitance variation
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ORIGINAL PAPER
Hybrid control of capacitive power transfer system for coupling capacitance variation Yugang Su1,2 · Zhenzhen Wang2 · Yuming Zhao2 · Xueying Wu2 · Zhe Liu2 · Xiaodong Qing2 Received: 17 January 2020 / Accepted: 25 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Focusing on the output voltage reduction caused by variation of the equivalent coupling capacitance in capacitive power transfer (CPT) system, this paper proposes a hybrid control strategy to achieve constant output voltage with the variation. The hybrid automata model is introduced for the cascaded CPT system considering the characteristics of higher order, nonlinear, multi-mode, continuous time and discrete states. The control process of the system is transformed into a selection of boundary transition conditions, which simplify the controller design and implementation. Then, a hybrid automata model of the system is established based on the theory of hybrid system, and the boundary transition of each mode of the system is given. The simulation and experimental results show that the proposed hybrid control strategy can keep the output voltage constant when the coupling capacitance of CPT system varies in a certain range. Keywords Wireless power transfer · Electric-field coupled · Coupling capacitance variation · Hybrid control
1 Introduction Wireless power transfer (WPT) technology utilizes magnetic field, electric field, laser, microwave and other medium to deliver electric power from power source to electrical equipment without direct electrical contacts. It eliminates the needs of direct conductor connection and has the advantages of convenience, flexibility, safety and reliability [1–4]. In recent years, capacitive power transfer (CPT) technology, which uses an alternating electric field as the transmission medium, has attracted more and more attention of researchers in the world [5–10]. Since the CPT system utilizes metal plates as the coupling mechanism and the high-frequency alternating electric field as the electric energy carriers, it provides advantageous features, such as light, thin and lowcost coupling structures, flexibility in coupling structure design, the ability to transfer power across metal barriers and low eddy-current losses in the surrounding metallic objects. * Yugang Su [email protected] 1
State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing, China
College of Automation, Chongqing University, Chongqing, China
2
Due to these characteristics, CPT has become one of the research hot spots in the WPT field. In some applications of the CPT technology, such as charging portable electronic devices, kitchen and household appliances, and electric vehicles, the pickup of CPT system (including the load resistor, the secondary side coupling plates, the power conditioner circuit, etc.) often needs to be moved out and back. The transmission distance and the relative position of the plates changed because of the removal
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