基于无源性理论的风电联合控制器设计

Passivity-Based Combined Controller Design for Wind Power Applications

为了提高风电变流器的动态响应速度,本文提出了一种基于无源性理论的联合控制器设计方案。将机侧、网侧变流器统一考虑,建立了风电变流器系统的整体模型。应用无源性理论对误差系统的跟踪问题进行了控制器的设计,通过采用无源电流控制器与转速、直流电压PI调节器构成的联合控制器结构,可以实现状态量的无静差跟踪、并提高系统的鲁棒性。在此基础上,基于对系统动态的分析,对状态平衡点的选取进行了优化设计,从而提高了控制系统的动态响应速度。硬件在环实验结果验证了该方法具有良好的稳态与动态性能。

In order to improve the dynamic response of wind power converters, this paper presents a design scheme of a combined controller based on passivity control theory. The main idea of proposed method is that the machine-side converter and the grid-side converter are considered together. The overall mathematical model is established for the linked converter system firstly. Then, the controller is designed for error tracking system by using passivity theory. For achieving no static errors and improving the robustness of the control system, the speed and DC voltage PI regulators are used together with passivity-based current controllers. Besides, the equilibrium points of the system are also optimized to achieve a fast dynamic response by analyzing the system dynamics. Finally, results of hardware-in-the-loop(HIL) experiment are given to verify that the proposed method has good steady state and dynamic state performances.