两电平电压源逆变器双矢量调制模型预测控制:理论分析、实验验证和推广

Two-Vector-Based Modulated Model Predictive Control Method for 2-Level Voltage Source Inverters:Theoretical Analysis,Experimental Verification and Extension

近年来,模型预测控制(MPC)以其良好的自适应性、鲁棒性等优越性能广泛应用于两电平电压源逆变器中。然而,常规的模型预测控制每个控制周期只使用1个电压矢量,导致电流谐波较大。为抑制电流谐波,提出一种双矢量调制模预测控制策略。首先,在每个控制周期同时使用两个电压矢量来跟踪目标矢量,且每个电压矢量的作用时间根据调制模型预测控制原理计算;其次,根据无差拍控制原理计算参考电压,并根据参考电压位置在每个控制周期仅需要选择三组电压矢量组合进行在线评估,从而得到最优电压矢量组合。最后,通过详细的理论分析,验证了所提双矢量调制模型预测控制策略的有效性。此外,该文研究还表明,所提策略还可用于控制其他类型的逆变器,如三相四开关逆变器。同时,所提方法可以获得和常规双矢量法类似的控制性能,且具有计算量小等优点。理论分析和实验结果验证了所提方法的有效性。

In recent years,model predictive control(MPC)has been widely used to control 2-level voltage source inverters due to its adaptability and robustness.However,in conventional MPC system,only one voltage vector is used per control cycle,resulting in larger current harmonics.To suppress the current harmonics,a two-vector-based modulated MPC strategy is proposed.First,two voltage vectors are used simultaneously to track the target vector in each control period,and the operating time of each voltage vector is calculated based on the principle of modulated MPC.Second,the reference voltage is calculated according to the principle of dead-beat control,and based on the position of the reference voltage only three voltage vector combinations are selected and evaluated online per control period to get the optimal voltage vector combination.Finally,the effectiveness of the proposed two-vector-based modulated MPC strategy is verified by detailed theoretical analysis for the first time.Additionally,the study in this paper also shows that the proposed strategy can be utilized to control other types of inverters,such as three-phase four-switch inverter.Meanwhile,the method proposed in this paper can obtain a similar control performance with the conventional two-vector method,with the advantages of less computation,etc.Theoretical analysis and experimental results verify the effectiveness of the proposed method.