Owing to its advantages such as simple structure,strong robustness and good dynamic and static perfor-mances,model predictive control(MPC) has been widely applied to three-phase voltage source PWM rectifier systems. However,the PI linear regulator adopted in the voltage outer loop of MPC affects the dynamic performance of DC-side voltage. Aimed at this problem,a virtual torque impulse balance control strategy is proposed to achieve a rapid conver-gence of DC-side voltage through only one time of regulation. To realize this strategy,the expression of virtual torque is derived based on the mathematical model at first. Second,the virtual torque impulse balance control equation under load mutation is analyzed and established according to the fact that the DC-side output voltage will remain unchanged before and after load mutation while combining the principle of power conservation. Afterwards,the acting time of zero and for-ward vectors can be obtained. Finally,the virtual torque impulse balance control of the three-phase voltage source PWM rectifier system under load mutation is realized through simulations and experiments,which verifies the correctness and effectiveness of the proposed algorithm.
关键词
三相电压型PWM整流器/模型预测控制/动态性能/虚拟转矩冲量平衡控制策略/负载突变
Key words
Three-phase voltage source PWM rectifier/model predictive control(MPC)/dynamic performance/virtual torque impulse balance control strategy/load mutation
维普
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