Abstract
Uncertainty commonly exists in the wireless power transfer (WPT) systems for moving objects. To enhance the robustness of the WPT system to uncertain parameter variations, a modified WPT system structure and an interval-based uncertain optimization method are proposed in this paper. The modified WPT system, which includes two Q-type impedance matching networks, can switch between two different operating modes. The interval-based uncertain optimization method is used to improve the robustness of the modified WPT system: First, two interval-based objective functions (mean function and variance function) are defined to evaluate the average performance and the robustness of the system. A double-objective uncertain optimization model for the modified WPT system is built. Second, a bi-level nested optimization algorithm is proposed to find the Pareto optimal solutions of the proposed optimization model. The Pareto fronts are provided to illustrate the tradeoff between the two objectives, and the robust solutions are obtained. Experiments were carried out to verify the theoretical method. The results demonstrated that using the proposed method, the modified WPT system can achieve good robustness when the coupling coefficient, the operating frequency, the load resistance or the load reactance varies over a wide range.
Highlights
In recent years, wireless power transfer (WPT) for moving objects using coupled magnetic resonance (CMR) has become a hot research topic, such as WPT for portable electronic devices and moving electric vehicles [1,2,3]
When the coupling coefficient k, the operating frequency f, the load resistance R L or the load reactance X L varies, the system efficiencies of the two kinds of WPT systems are shown in Figure 10a–d, respectively
When the coupling coefficient k, the operating frequency f, the load resistance RL or the load reactance X L varies, the system efficiencies of the two kinds of WPT systems are shown in Figure 10a–d, respectively
Summary
Wireless power transfer (WPT) for moving objects using coupled magnetic resonance (CMR) has become a hot research topic, such as WPT for portable electronic devices and moving electric vehicles [1,2,3]. Unlike WPT systems for stationary objects, there are many uncertain parameters in the WPT systems for moving objects. The magnetic field of the dynamic charging system is prone to interact with the objects around it, such as metal materials, and electromagnetic devices, etc. These external uncertain factors will change the impedance parameters of the circuit and make the resonance frequency of the system uncertain [6,7]. The load impedance of the WPT system will be influenced by many uncertain factors, including environmental change, and load switching, etc. The load impedance of the WPT system will be influenced by many uncertain factors, including environmental change, and load switching, etc. [8,9,10] The load impedance variations will bring uncertainty to the WPT system
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