电流型PWM整流器的非线性控制

电流型PWM整流器在同步坐标系下的数学模型呈现非线性、强耦合的特性，使其控制器的设计较为困难。该文首先基于非线性微分几何理论，分析了三相电流型PWM整流器实现输入/输出精确线性化的条件，指出线性化后的系统存在一阶零动态，然后提出了三相电流型PWM整流器的非线性控制策略，实现了交流电流d轴分量和q轴分量的解耦控制。最后该文分析了非线性系统一阶零动态的稳定性，并设计了状态反馈控制器以改善其动态响应特性。仿真和试验结果验证了所提出方法的有效性。

Nonlinear Control of Current-Source PWM Rectifier

The dynamic model of three phase current- source PWM rectifier (CSR) in the d-q synchronous reference frames is nonlinear and strong coupling, which makes it difficult to design the controllers. In this paper, firstly based on nonlinear differential geometric theory, the geometric condition to achieve the input/output exact linearization of the CSR is analyzed and it is indicated that a first-order zero-dynamic exists after the system are linearized. Then the nonlinear control of current source PWM rectifier is proposed, which achieves decoupled control of d axis and q axis component of ac current. Finally the stabilization of zero-dynamic is analyzed, and a state feedback controller cascade to inner current loop is designed to improve the dynamic response of the zero dynamics. The validity of the proposed method is verified by simulations and experiment results.