级联H桥整流器控制策略

Control strategy of cascaded H-bridge rectifier

针对级联H桥整流器本身的非线性和非最小相位系统特性,通过分析单相两级联H桥整流器的拓扑结构和工作原理,对级联多电平整流器直流侧电压的平衡和动态性能方面的问题进行了研究.采用滑模控制理论设计电压电流控制器,通过选取合适的切换面使系统状态轨迹在设定的滑模面上运动,并结合二维调制的电压平衡调制策略,从而提高系统在负载突变等情况下的输出电压响应速度和动态性能指标.搭建了基于Matlab/Simulink的仿真模型和基于RT-lab的半实物实时仿真实验平台,仿真和实验验证了该控制算法的可行性和有效性.

In light of nonlinear and nonminimum phase system characteristics of the cascaded H-bridge rectifier, through analyzing the single phase two cascaded H-bridge rectifier topology, the problem of balancing and dynamic performance of cascaded multilevel converter DC side voltage is studied. Using sliding mode control theory to design the voltage and current controller, by selecting the appropriate switching surface make the system state trajectory set on the sliding mode surface, and combined with two-dimensional mod- ulation voltage balance modulation strategy, thereby improving the response speed and dynamic perform- ance index of system output voltage under load situation. A simulation model based on Matlab/Simulink and a semi-physical real-time simulation experiment platform based on RT-1ab are built up. The simulation results and the experimental results verified the feasibility and effectiveness of the proposed control algorithm.