Model and control of resonant converters / 谐振变换器的建模与控制

There exists a continuous demand on the large-scale wireless charging of smart portable devices, such as robots, drones, electrical vehicles. In order to meet these demands, the inductive power transfer (IPT) technique has been gradually developed from system level to network level, which further requests the small-signal model and stability analysis to ensure the safe and stable operation of various systems and networks. This research is devoted to building, simplification, and unification of small signal model of various IPT systems, and then studies the stability of the IPT network under the bus of AC, DC or magnetic field. 1) This research would start from the modelling and simplification of single-stage IPT system, and develop the controller design method for frequency, amplitude, and phase modulation. 2) Meanwhile, this research would discuss the small-signal behavior for the two-stage IPT systems under distributed and concentrated control scheme, which helps the stability analysis and controller design. 3) When various IPT systems form the network under DC or AC grid, this research would evaluate the influence of the individual perturbation on the overall network, and develop the strategy for stable operation. 4) Finally, this research would propose a novel IPT network through the bus of magnetic field, and then explore the stability under the magnetic-field perturbation. In summary, this research will develop a general modeling and simplification method to build a uniform small-signal model, which would offer the theoretical guideline for the controller parameter design for various IPT systems and networks. It is particularly meaningful to build the fundamental theory for the stability analysis under the conductive and radiative perturbation.

在智能终端规模化充电需求的驱动下，基于磁场耦合谐振的无线电能传输技术正呈现大系统化与网络化的趋势，迫切需要通过小信号模型开展对于系统与网络的稳定性分析。本研究旨在系统层面建立、化简并统一小信号等效电路模型，进而在网络层面探索各类系统通过交流、直流或磁场母线组网后的稳定性问题。1）以单级系统为切入点，建立通用的建模与降阶方法，辅助系统在调频、调幅、调相下的控制器设计；2）提取两级系统在分布式与集中式控制架构下的小信号特征，开展多级系统的稳定性分析与控制器设计；3）在交、直流电网下，分析无线充电系统个体扰动对网络的影响，提出网络稳定运行的策略；4）提出磁场母线组网方法，建立辐射性扰动下该网络的稳定性分析方法。研究结果将形成通用的系统建模与化简方法，获得统一的小信号模型，为不同系统与网络的控制参数设计提供理论依据，最终为传导与辐射扰动下系统与网络的稳定性分析建立初步的理论基础。