【作者】 胡庆；

【导师】 梁中华；

【作者基本信息】 沈阳工业大学 ， 电力电子与电力传动， 2002， 硕士

【摘要】 本文的主要研究内容是：将滑模变结构理论应用于电力电子开关变换器的控制之中。在电力电子开关变换器中，电子电子元件的唯一工作模式便是“开”或“关”的操作，而滑模变结构控制要求频繁、快速地切换系统的控制状态，两者的这一共同特点是利用滑模变结构方法控制电力电子变换器的基础，所以应用滑模变结构理论控制电力变换器是可行的。与经典控制方案(如PWM控制)相比，滑模控制的主要优点是有很强的鲁棒性，这使其具有很好的动态性能。有文献已经证明滑模控制是一种控制电力开关变换器的好方法。本文首次将滑模变结构控制应用于H型桥式DC-DC变换器、三相整流器和三相逆变器中。 首先，本文将负载、滤波器和开关阵一起考虑，建立了电力电子变换器的数学模型，包括DC-DC变换器、三相整流器和三相逆变器。然后，基于上述模型设计了具有电流环和电压环双闭环结构的滑模变结构控制器，以提高电力电子变换器的鲁棒性和动态性能。 其次，抖振问题是影响滑模变结构控制广泛应用的主要障碍，本文在深入研究造成系统抖振原因及各种消弱抖振方法的基础上，提出了一种模糊滑模变结构控制器，综合了模糊控制和滑模变结构控制各自的优点，以消弱变结构系统的抖振。 最后，以仿真实验验证了文中算法的有效性，仿真结果表明：应用滑模变结构理论控制电力变换器不但设计和实现简单，而且效果优良；模糊滑模变结构控制优于传统滑模变结构控制。更多还原

【Abstract】 This paper is devoted to studies of power electronic switching converters using Sliding Mode Variable Structure Control (SMVSC) theory. Since the "on-off operation mode is the only admissible one for power converters, it does not cause any difficulties when they are controlled by SMVSC which implies high frequency switching in implementation. The main advantage over the classical control schemes (e.g. PWM control) is its robustness for plant parameter variations, which leads to invariant dynamics and steady-state . response in the ideal case. Some literature states that sliding mode control has been presented as a good alternative to the control of switching power converters. SMVSC is firstly applied to H-model bridge DC-DC converter, three-phase rectifier and three-phase inverter in this paper.On the basis of the mathematical descriptions of power converters in which load, filter and switching matrix are taken into account together, such as DC-DC converter, three-phase rectifier and inverter, the sliding mode controllers with double closed-loop structures of current and voltage loop are designed to improve the robust and dynamics of power electronic switching converters.The chatting problem is the main obstacle to use the variable structure sliding mode control widely. In order to alleviate this phenomenon, the reasons that lead to the chatting and several alleviating chattering methods are discussed and analyzed in detail, and a new chattering alleviation method, a Fuzzy Sliding Mode Variable Structure Controller (FSMVSC), is proposed in this paper. FSMVSC combine the advantages of both fuzzy control and sliding mode variable structure control.The proposed algorithms are verified by simulation. The results show that SMVSC for power converters is rather simple and yet quite efficient, and that the advantages of FSMVSC are obvious in comparison with traditionalSMVSC.更多还原