四象限变流系统建模及滑模控制方法

Modeling and sliding-mode control method of 4-quadrant conversion system

基于四象限变流器的状态空间平均模型,针对其多变量、时变性和非线性问题,通过线性化处理,推导出其交流侧电流幅度对直流侧输出电压的微变瞬态模型、传递函数控制模型和稳态模型。基于这3个模型,并依据四象限变流系统控制必须兼顾输入和输出多个物理量静、动态品质的特点,提出了一种滑模变结构配合插入积分补偿环节的控制方法,并运用线性切换控制策略,进行了电压控制器的设计和系统仿真研究。试验结果和仿真结果均表明,该系统具有良好的控制性能。

A dynamic small signal model, transfer function and steady state model as concerns ac-side current amplitude and de-side output voltage were derived from the state space averaging model of the 4-quadrant converter by using linearization processing for its multivariable, time-variability and nonlinearity. In the 4-quadrant conversion system, the static and dynamic quality of multiple physical variables in both input and output is concerned concurrently. Considering the control features of the system, a sliding-mode-variable-structure control method combined with an integral compensation element was presented on the basis of the three models. Its linear switching control strategy was applied to voltage controller design and system simulating research. Both the experimental results and the simulation results show that the system has a high quality in performance.