模块化多电平变换器的新型滑模控制器设计

Design of Novel Sliding Mode Controller for the Modular Multilevel Converter

为了提升模块化多电平变换器(MMC)应用性能,设计了一种MMC的新型滑模控制器(SMC)。通过对系统动态的建模分析,得到了系统控制参数之间的关联性及其适用条件,从而指导了SMC的设计。与传统比例积分(PI)控制器相比,SMC应用于MMC时可提供相当的稳态性能,但动态响应更快,同时不会影响计算量,且对系统模型的精确性无要求。基于PSCAD/EMTDC软件进行了所提出控制策略的仿真,同时利用实验室原理样机进行了实验,仿真和实验结果均验证了新型SMC应用于MMC的性能。

In order to improve the application performance of the modular multilevel converter(MMC),a novel sliding mode controller(SMC)of MMC is designed.Through modeling and analysis of system dynamics,the relations among control parameters and their validity conditions are obtained,thus guiding the design of SMC.Compared with traditional proportional-integral(PI)controller,SMC can provide comparable steady-state performance for MMC,and the dynamic response is faster without affecting the amount of calculation,and there is no requirement for the accuracy of the system model.Based on PSCAD/EMTDC software,the simulations of the proposed control strategy have been carried out.At the same time,experiments are carried out using laboratory prototypes.The simulation and experimental results both verify the performance of the new SMC for MMC.