弱电网情况下基于改进型有限集模型预测控制新型三相三电平整流器的研究

传统三相三电平整流器开关多、控制复杂、损耗大,为此提出一种新型三相三电平整流器拓扑.在弱电网中,电网电压不平衡现象不可避免,当电网电压不平衡时,传统的控制算法计算量大、控制复杂且电网电流畸变严重.为使新型三相三电平整流器在弱电网条件下正常运行,提出一种改进型有限集模型预测控制方法,实现电网电流的快速跟踪、谐波抑制及直流...

Research on Novel Three-phase Three-level Rectifier Based on Improved Finite Set Model Predictive Control Under Weak Grid Conditions

Traditional three-phase three-level rectifiers have many disadvantages such as many switches, complicated control, and high loss. So, a novel three-phase three-level rectifier topology is proposed in this paper. Moreover, in the weak grid, the unbalanced grid voltages are unavoidable. When the grid voltages are unbalanced, the traditional control algorithm has a large amount of calculation, complicated control, and serious grid current distortion. In order to make the novel three-phase three-level rectifier operate normally under the weak grid conditions, an improved finite set model predictive control method is proposed, which realizes fast tracking of grid current, harmonic suppression and balance control of DC side midpoint voltage. The article first analyzes the working principle and mathematical model of the new topology, and then constructs the current command value of the novel three-phase three-level rectifier under weak grid conditions. Finally, an improved finite set model predictive control is proposed for the novel three-phase three-level rectifier. Simulation and experiments verify the effectiveness of the proposed algorithm.