【作者】 杨国权；

【导师】 樊明武； 段善旭；

【作者基本信息】 华中科技大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 本文以400Hz单相逆变器为研究对象,从控制方法和电路结构两个大的方面对其进行了论述。对于传统电压型逆变器,本文从控制的角度出发,针对重复控制算法动态性能较差的问题,讨论了各种复合控制对输出电压的调节能力;对于采用高频链技术的中频逆变器,在电路结构不变的条件下,讨论了三种控制策略来实现其恒压恒频的输出。首先,对于传统的PWM逆变器,建立了它的连续和离散时间状态控制模型,采用基于逆变器实测频率特性的模型参数确定方法。使用MATLAB建立了逆变器的仿真模型,分析了死区效应、直流偏磁、输出阻抗和过调制对单相逆变器输出电压的影响。然后,本文对重复控制进行了理论分析,结合其典型的控制系统结构讨论了稳定性、误差收敛速度、稳态误差;之后详细介绍了中频逆变器重复控制器的设计方法,并给出实例;考虑到单相逆变器重复控制算法抗扰动能力的不足,经过多种复合控制方法的比较,本文选用带积分环节的状态反馈控制,采用观测器超前预测补偿数字滞后一拍控制,给出了状态观测器的原理和实现方法。由于传统电压型逆变器在重量体积上存在的缺点,本文对高频链逆变器的实现问题做了分析和讨论,阐述了三种常见高频逆变器控制策略方案,其中单极性移相全桥高频链控制方法可实现变压器前端开关管和周波变换器的ZVS开关,通过周波变换器的换流重叠可解决变压器漏感和滤波电感电流的自然换流。是实现逆变电源高频化的一个较好的方向。最后,通过仿真实验验证了基于单极性移相控制方法的可行性。更多还原

【Abstract】 Traditional inverter and high-frequency-link inverter are researched based on 400Hz single phase inverter. For traditional inverter, it produces very poor response with sudden load change when repetitive control algorithm is used, so several compounded control methods are employed to improve its dynamic characteristic. For HLF inverter, three control strategy are discussed to realize the CVCF inverter output with the same main circuit topological structure.Based on the state-space averaging and linearization technique ,the continuous and discrete models of single-phase inverter are established with the load current treated as a disturbance. A simulation model is established with MATLAB software and the influence of dead-time, flux imbalance and output impedance in single-phase full-bridge inverters is analyzed.A comprehensive theoretic analyze is carried out on repetitive control system .System stability, error convergence and steady-state error are discussed. Then design method of repetitive control system and example are given out. To improve the dynamics of the inverter, the state feedback pole assignment control is used. The integral control is added in the pole assignment to eliminate the error caused by the sudden change of the load .State observer is used to compensate one-step-delay control .This paper shows the principle and realization of the state observer.In view of HFL inverter, three control strategies are introduced in this paper. Compared with the others, the uni-polarity phase-shifted controlled converters have better performance. It realizes soft commutation of shift-phase bridge and cycloconverter, so it`s a good research direction of HFL inverter .In the end, simulation results prove that the proposed control strategy can realize the good output voltage.更多还原