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  

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

作　　者：张贞艳[1] ZHANG Zhenyan(School of Mechanical and Electrical Engineering,Suqian University,Suqian 223800,China)

机构地区：[1]宿迁学院机电工程学院,宿迁223800

出　　处：《电源学报》2021年第1期59-68,共10页Journal of Power Supply

基　　金：“青蓝工程”资助项目;江苏省高校品牌专业建设项目(PPZY2015C252);宿迁市科技计划资助项目(S201609)。

摘　　要：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、谐波抑制及直流侧中点电压的平衡控制。首先分析了新型拓扑结构的工作原理及数学模型;然后构造了弱电网条件下新型三相三电平整流器的电流指令值;最后针对新型三相三电平整流器提出改进型有限集模型预测控制。仿真与实验验证了所提算法的有效性。The traditional three-phase three-level rectifiers have many disadvantages,such as numerous switches,complicated control,and high loss.To solve these problems,a novel topology of a three-phase three-level rectifier is proposed.Moreover,the phenomenon of unbalanced grid voltage is unavoidable in the weak grid,under which the traditional control algorithm has a large calculation amount,complicated control,and serious grid current distortion.To make the novel three-phase three-level rectifier operate normally under the weak grid conditions,an improved finite set model predictive control(MPC)method is proposed,which realizes the fast tracking of grid current,harmonic suppression and the balance control of DC-side mid-point voltage.First,the working principle and mathematical model of the novel topology are analyzed.Then,the current command value for the novel three-phase three-level rectifier under weak grid conditions is constructed.Finally,an improved finite set MPC is proposed for the novel three-phase three-level rectifier.Simulation and experimental results verified the effectiveness of the proposed algorithm.

关 键 词：弱电网 新型三相三电平整流器 改进型有限集模型预测控制 中点电压控制 

分 类 号：TM464[电气工程—电器]