基于离散变速趋近律控制的电流源逆变器

由于电力电子电路本身的开关工作特性，它从本质上来说是一种变结构系统。该文将一种新颖的基于变速趋近律的离散滑模变结构控制策略应用于全桥电流源逆变器系统中，给出了系统的动态模型。为了使系统能够渐近稳定到原点，该文讨论了离散滑模切换区的范围，同时分析设计了滑模超平面系数的选取范围。该系统用于交流功率源，所以它输出电流的幅值和频率必须有一个比较宽的输出范围，同时能够在基波上叠加多次谐波。实验结果证明了此离散滑模变结构控制策略具有很好的鲁棒性，以及良好的稳态和动态性能。

A Discrete-time Variable Rate Reaching Law Controlled Current-source Inverter

Power electronic circuit is essentially a variable structure system due to its switching nature. In this paper, a novel discrete-time sliding mode controller based on variable rate reaching law has been applied to control the current-source inverter (CSI). The dynamic modeling of CSI is presented. The design of the sliding domain and the sliding surface coefficient are analyzed to ensure that the system will converge to zero asymptotically. The proposed CSI system is used in AC power source, which may generate sinusoidal currents with adjustable amplitudes and frequencies over a wide range, as well as various arbitrary waveforms that fundamental sine wave with harmonics. The experimental results are demonstrated to prove that the proposed control strategy provides excellent robustness with regard to external disturbances, and well steady state operation and dynamic response of the output current.