【作者】 刘勇；

【导师】 贺益康；

【作者基本信息】 浙江大学 ， 电机与电器， 2002， 硕士

【摘要】 矩阵式变换器是一种先进拓扑结构的“全硅”功率变换器，它允许频率单级变换，无需大容量的贮能元件。能使输入电流正弦，输入功率因数可达到0.99以上并可自由调节，且与负载的功率因数无关。输出电压正弦，能量可双向流动。 本文从等效交一直一交变换的空间矢量调制方法出发，深入分析了矩阵式变换器的变换关系，推导出了交一交直接变换控制规律和双空间矢量PWM调制技术，实现了交一交直接变换控制方式下矩阵式变换器的建模和运行分析，并进行了计算机仿真和实验研究。针对当前尚无双向开关器件的现状，仿真中首次采用了IGBT组合双向开关并应用四步换流控制实现开关的安全切换，仿真结果非常贴近实际。本文还结合了矩阵式变换器、交流励磁发电技术和矢量控制的优点，建立了矩阵式变换器供电的变速恒频交流励磁风力发电机定子磁场定向的矢量变换控制系统模型，对矩阵式变换器在交流励磁发电系统中应用进行了仿真研究。为进行对矩阵式变换器系统的实验研究，采用CPLD(复杂可编程逻辑器件)实现了IGBT组合双向开关的四步换流逻辑控制，并通过仿真和实验进行了预测和验证。以DSP(数字信号处理器)为核心构造了矩阵式变换器控制系统的硬件，进行了软件设计、编程和硬件调试，完成了矩阵式变换器驱动异步电机变频调速实验。仿真和实验结果验证了本文策略的正确性和可行性。 本文立论研究的目的是对矩阵式变换器基本原理、控制策略、开关换流、应用范围等基本性问题进行探索性研究工作。通过理论分析、计算机仿真和实验验证得出了一些有意义的经验和结论，为课题的进一步的深入研究奠定了基础。更多还原

【Abstract】 Matrix converter is an "all silicon" power converter with an advanced circuit topology. It permits frequency conversion in a single-stage processing without the need of large reactive energy storage components, such as DC capacitor. It draws sinusoidal input currents and allows the input fundamental displacement factor to be set at unity or freely varied regardless of the load power factor. Besides these, it is capable of performing frequency conversion with sinusoidal output voltages and currents at the desired output frequency and allows bi-directional power flowAccording to the space vector modulation method of the equivalent structure of the AC-DC-AC conversion, the conversion relations of the matrix converter were deeply investigated. The AC-AC direct transformation control and the double-space-vector PWM scheme of the matrix converter were deduced and the modeling, sin~iu1ation and experiment of a three-phase matrix converter were implemented. Due to the lack of the true bi-directional switches at present, the combinations of IGBTs controlled by four-step current commutation algorithm were adopted in the simulation, which made the study very close to the reality. Combined with the advantages of matrix converter, AC-excited generation technique and vector control scheme, the stator flux-oriented vector control model of the Variable-Speed Constant-Frequency (VS CF) AC-excited generator fed by a matrix converter was developed. Simulation studies of the proposed power generation system were carried out. Combinations of IGBTs controlled by four-step current commutation algorithm, was implemented by the CPLD, which was also forecasted and validated by the simulation and experiment. The hardware of the DSP-based control system was constructed and the software was designed and written. Experiments of applying the matrix converter to induction motor drive were completed. The simulation and experiment results demonstrate the correctness and feasibility of this scheme.This thesis discusses principal issues of the matrix converter such as prime principle, control strategy, current commutation, its applications etc. By the theoretical analysis, computer simulation and experimental investigation, some valuable experiences and significant conclusions are given, which found the basis of the project for the further studies.更多还原