电流型交流功率放大器离散衰减变速趋近律控制  

A Discrete-Time Attenuating Variable Rate Reaching Law Control for Current-Source AC Power Amplifier

作　　者：许飞[1] 马皓[1] 何湘宁[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2008年第5期75-80,共6页Transactions of China Electrotechnical Society

摘　　要：交流功率放大器具有输出稳定、精度高以及动态响应快等特点,而且它输出电流的幅值和频率范围较宽,同时能够在基波上叠加多次谐波。为了实现上述性能,文中采用了一种新颖的基于衰减变速趋近律的离散滑模变结构控制策略,既保留了离散变速趋近率的优点,又加快了系统的渐近稳定速度,同时大大减小了系统的抖动。本文给出了电流型交流功率放大器的工作原理,对离散滑模超平面方程进行数学建模分析。文中分析设计了离散滑模切换区和滑模超平面系数的选取范围,以保证该离散滑模变结构控制策略满足滑模条件和收敛条件,以及使系统能够渐近稳定于原点。最后实验结果验证了上述分析和设计的正确性。AC power amplifier is well-known with some good characteristics such as stable output, high precision and dynamic response. And it may generate sinusoidal waves with adjustable amplitudes and frequencies over a wide range, as well as various arbitrary waveforms that fundamental sine wave with harmonics. To achieve those performances, this paper adopts a novel discrete-time sliding mode controller based on attenuating variable rate reaching law, which not only force the system into the asymptotic stability quickly but also reduce the chattering of the system greatly. Base on the model of the current-source inverter （CSI） system, the mathematical modeling for discrete-time sliding surface is established and studied, and the sliding domain and the sliding surface coefficient are also discussed in detail to ensure the system steady asymptotically. Finally, experimental results are demonstrated to validate the theoretical design.

关 键 词：交流功率放大器 离散滑模变结构控制 衰减变速趋近律 电流源逆变器 

分 类 号：TM464[电气工程—电器]