滑模变结构控制在三电平变换器中的应用研究

Application of Sliding-Mode Control Schemes in Three-level Converters

滑模变结构控制策略具有鲁棒性强、算法简单、动态品质好等优点,为此,本文首次将滑模变结构控制策略引入到三电平变换器中。首先介绍了直接滑模控制策略,然后给出了三电平变换器直接滑模控制策略的设计方法,最后对滑模控制三电平变换器进行仿真分析,并和PWM控制三电平变换器做比较,仿真结果验证了滑模变结构控制策略可以大大提高变换器鲁棒性和动态品质。

Sliding-mode control strategy has such advantages as robustness, simple algorithm and dynamics performance. Sliding-mode control strategy is for the first time introduced to three-level converters. At first, direct sliding-mode control strategy is presented. Then the design of three-level converters based on direct sliding-mode control strategy is described. In the end, simulation analysis of three-level converters based on direct sliding-mode control, as well the comparison between three-level converters based on direct sliding-mode control strategy and PWM three-level converters strategy is given. Analysis results verify that using the three-level converters based on sliding-mode control strategy, dynamics performance and robustness are improved greatly.