新型Buck逆变器3阶滑模控制策略

为提高滑模控制变换器的稳态精度，针对一种由两组独立对称的双向Buck变换器组合的新型DC/AC逆变器拓扑提出了3阶滑模控制策略。基于系统等效电路的动态模型，采用李导数给出了3阶连续滑模控制器详细分析和设计，并给出了滑模面系数的选取方法。该文还采用映射法把三维轨迹化为两维情况，简化分析过程，且运用相平面法形象描述滑模切换区和滑模运动。实验结果证明此3阶滑模控制策略较好地改善了系统的稳态性能，同时具有良好的动态性能。

Novel Three-order Sliding Mode Control Strategy for Buck Inverter

In order to increase the precision, a novel third-order sliding mode control strategy was proposed for the Buck DC/AC inverter composed of two symmetrical current bi-directional Buck converters. Base on the equivalent circuit of Buck inverter, the analysis and design of the third-order sliding mode controller was done according to Lie derivative method. The selection method of the sliding surface coefficients was given. To simplify the analysis, three- dimensional trajectory was transformed into two-dimensional one through mapping transformation. The sliding domain and sliding motion were described by phase trajectory. Experimental results show the proposed control strategy can improve the steady performance of the system and has good dynamic performances.