【摘要】 在建立电流源型 PWM变流器稳态数学模型的基础上 ,分析了系统的耦合关系 ,提出了一种基于小偏量线性化的前馈解耦控制方案。依据该方案设计前馈解耦控制器 ,削弱系统耦合关系 ,将电流源型 PWM变流器这一两输入两输出的耦合系统改造成两个近似独立的单输入单输出系统 ,实现了在工作点附近分别控制系统直流电流 Id 和系统功率因数角 这一控制思想 ,尽量避免或减少不同工作点之间相互过渡过程中的振荡。仿真试验证实了这种前馈解耦控制方案的正确性以及在改善系统速度、稳定等方面的优越性。更多还原

【Abstract】 On the basis of the stationary state mathematical model of a PWM current-source converter, the paper analyzes the coupling of a converter and presents a simple decoupling feedforward control method. In this method, the theory of feedforward linearization for nonlinear system is applied to obtain two relatively independent SISO system, from the double input double output system of the PWM current-source converter, realizing individual control of the direct current Id and power factor angle φ near the operating point of a converter and avoiding or reducing transitional vibration between different operating points. MATLAB numerical simulations confirm the validity and superiority of the decoupling feedforward control method in improving the speed and stability of the converter.更多还原