机构地区: 华南理工大学电力学院
出 处: 《华南理工大学学报(自然科学版)》 2009年第11期83-87,106,共6页
摘 要: 研究了一种基于滑模变结构控制理论的三相脉宽调制(PWM)整流器直接功率控制方案,利用滑模变结构控制系统鲁棒性和动态性能较好、参数整定简单的优点,解决了传统的基于PI算法的直接功率控制系统抗扰性能差、对PI控制参数较敏感、网侧电流总谐波含量较大的缺点.在Matlab/Simulink环境中建立仿真模型,对滑模控制和PI控制两种方案进行仿真比较,结果表明滑模控制方案明显优于PI控制方案. Proposed in this paper is a direct power control scheme for three-phase PWM rectifiers based on the sliding-mode variable-structure control theory. In this scheme, the slide-mode variable-structure control system with strong robustness, excellent dynamic performance and simple parameter tuning is employed to remedy the shortcomings of the conventional direct power control system based on PI algorithms, namely high sensitivity to external disturbances and PI parameters and large total harmonic distortion (THD) of line current. Then, both the proposed and the conventional PI-based control schemes for three-phase PWM rectifiers are modeled and compared in Matlab/Simulink simulation environment. The results show that the proposed scheme is superior to the conventional one.
关 键 词: 整流器 控制器 直接功率控制 滑模变结构 仿真
领 域: [电气工程]