三相VSR新型双环控制策略研究

建立了三相电压型PWM整流器在d—q坐标系下的非线性数学模型．通过非线性输入变换和引人交、直流侧的功率平衡方程，推得三相电压型PWM整流器的线性化数学模型；并设计了双闭环控制系统，电压外环为非线性PI控制，电流内环为反馈线性化控制．仿真结果表明，基于该控制方案的系统具有较好的动态特性和较强的鲁棒性；控制系统全局稳定，输出直流电压无稳态误差．

Research on Novel Double-loop Control Strategy of Three-phase VSR

The nonlinearized mathematical model of three-phase voltage source PWM converter was estab lished in d-q-coordinates. From the nonlinearized model,a linearized mathematical model was derived by nonlinearized transformation and power balance equation. A double-loop control strategy was proposed, in which the current inner loop based on linearized feedback control theory and the voltage outer loop based on non-linear PI control. The simulation results show that, based on the control scheme of the system has a very good dynamic performance and stronger robustness,global stability of control system. And there was no steady state error of the DC output voltage.