准Z源逆变器级联模型预测控制  

Sequential-model Predictive Control for Quasi-Z-source Inverter

作　　者：吴春 杨佳磊 陈强[1] WU Chun;YANG Jialei;CHEN Qiang(College of Information Engineering,Zhejiang University of Technology,Hangzhou 310023,Zhejiang Province,Chin)

机构地区：[1]浙江工业大学信息工程学院,浙江省杭州市310023

出　　处：《中国电机工程学报》2021年第12期4286-4296,共11页Proceedings of the CSEE

基　　金：国家自然科学基金(面上项目)(61973274);浙江省自然科学基金项目(LQ18E070005)。

摘　　要：针对准Z源逆变器(quasi-Z-source inverter,qZSI)有限集模型预测控制(finite control set-model predictive control,FCS-MPC)策略存在权重系数调整缺乏合适的准则、调试繁琐等问题,提出一种适用于qZSI的级联模型预测控制(sequential-model predictive control,S-MPC)策略。在S-MPC策略中,首先根据电感电流的预测值判断下一个周期是否采用直通状态。若为直通状态,则选择直通矢量作为下一周期开关状态。否则,按照电容电压和输出电流控制对象的优先级,先计算优先级高的代价函数,并选取2个电压矢量用于下一级控制对象代价函数计算,从而消除了权重系数。同时,分析不同级联顺序对控制性能的影响。实验结果表明,所提qZSI的S-MPC策略,相比传统的FCS-MPC策略,在无需设计权重系数的条件下,使各个控制对象均得到了良好的控制,同时具有输出电流谐波小、动态响应快、抗扰动能力强、参数鲁棒性强、计算量小等优点。For the application of finite control set-model predictive control(FCS-MPC) strategy in quasi-Z-source inverter(qZSI), there are problems such as the lack of proper criteria for adjustment of weighting factors and cumbersome debugging. To solve these problems, a sequential-model predictive control(S-MPC) for qZSI was proposed. In this S-MPC, firstly, whether the next period was shoot-through state could be determined by calculating the predicted value of the inductor current. If it was shoot-through state, the shootthrough vector will be chosen as the next state. Otherwise, according to the priority of the capacitor voltage and the output current, the cost function with high-priority would be calculated and two voltage vectors were selected for the calculation of the low-priority cost function. By this way, the weighting factors could be eliminated. Moreover, the impact of different sequences on control performance was analyzed. The experimental results show that, compared with the traditional FCS-MPC strategy, the proposed S-MPC strategy of qZSI enables each control object to be well controlled without designing weighting factors. Besides, the proposed strategy has the advantages of low output current harmonic, fast dynamic response, strong anti-disturbance ability, strong parameter robustness and low computation burden, etc.

关 键 词：准Z源逆变器 有限集模型预测控制 级联模型预测控制 权重系数 

分 类 号：TM464[电气工程—电器]