【作者】 佘宏武；

【导师】 林桦；

【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】 矩阵变换器是一种高功率密度,高输入输出波形质量的新型电力变换器,具有良好的应用前景。目前有诸多因素困扰着矩阵变换器的实用化,其中一个最主要的原因就是矩阵变换器的换流问题。换流策略的可靠与否直接关系到矩阵变换器的安全运行,是矩阵变换器的技术难点之一。在详细分析各种换流技术的基础上,本文对具有应用前景的电压型换流技术进行了深入研究。针对电压型换流法在过渡区间内,即两相电压接近的情况下可能存在的换流问题,本文提出了一种在过渡区间内采用的新型四步换流策略。新型换流策略采用一种特殊的换流时序实现过渡区间内的可靠换流而不需要考虑电压相近的两相之间的相对电压。本文设计了基于IGBT的矩阵变换器主电路和基于EXB841的门极驱动保护电路,通过合理选择EXB841驱动保护电路的保护门限,可以实现对IGBT的过流保护;设计了基于DSP和CPLD的矩阵变换器控制电路,将矩阵变换器调制策略和换流策略的独立实现,实现了控制系统的模块化;通过软硬件相结合的方式,实现了对输入电压区间的可靠检测和区分。基于本文提出的新型换流策略编写了基于VHDL语言的换流控制程序,并针对该换流程序进行了仿真分析,仿真结果证明了换流时序的正确性。分别采用基本电压型半自然两步换流策略和本文所提出的新型换流策略进行了实验研究,实验结果证明新型换流策略的正确性。更多还原

【Abstract】 Matrix Converter (MC), which has good prospect, is a novel power converter with high power density and high-quality input and output waveforms. There are many factors plagued the application of the MC, one of the main reasons is the commutation problems. The reliability of the commutation strategy, which is directly related to the security of the MC, is one of the key technical difficulties.Based on the foundation of detailed analysis on various commutation strategy, the voltage based commutation technology, which have better prospect, was investigated in this thesis. An improvement measures which called Novel Commutation Strategy was proposed for the commutation problem in the interval zone.The MC main circuit based on IGBT and the gate driver circuit based on EXB841 was constructed, the over-current protection was realized by adjust the threshold of the EXB841. The control circuit of MC based on DSP and CPLD was designed. The modulation strategy and commutation strategy were realized individually for modular design. The input voltage zone was reliably detected by the collaboration of hardware and software.The VHDL program for MC commutation based on the Novel Commutation Strategy was coded; the simulation results verified the commutation schedule. The basic semi-natural two-step commutation technology and the Novel Commutation Technology were compared based on experimental results. The experimental results verified the validity of the Novel Commutation Strategy.更多还原