Design Research On High Frequency Link Inverter With Matrix Converter

Matrix converter is a green, pollutin-free power converter having these advantages, such as compact structure, smaller size, and flow of bidirectional power. In addition, the parameter of the converters are adjustable, for example, the input power factor, the amplitude of the output voltage and the frequency, and so on. Besides, there is no need for DC storage energy devices. Therefore, the domestic and overseas scholars think highly of the matrix converter, and agreed that the research value of such field is extremely high.Firstly, analyzing the basic principle of the high frequency link inverter with matrix converter, the main research content is established in this paper. Then, the indepth research on the high frequency link inverter with matrix converter has been done respectively from the theoretical analysis, several aspects of mathematical modeling, software simulation, prototype development and so on.By analyzing in detail the matrix converter commutation strategy and system control strategy, the core chain matrix converters have adopted the coupling of topology control strategy. According to the control strategy, the core part can be equivalent to two parallel conventional three-phase voltage inverters. Thus the sinusoidal pulse width modulation (SPWM) control strategy is completely suitable for the high frequency link inverter with matrix converter.Secondly, the methods and the significance for mathematical modeling of the power electronic circuits are discussed. In this thesis, two kinds of modeling methods of matrix high frequency inverter are mainly introduced. It has been proved that the de-coupling control strategy of matrix converter solution is right by mathematical modeling, mathematical derivation. And it has also been validated by Matlab software simulation that the control strategy is feasibility. Besides, the loss of the power switch tube is briefly analyzed.Finally, the manufacture process of the experimental prototype is introduced in detail. The circuit design and parameter calculation of the full bridge inverter module, the matrix converter module, the high-frequency transformers, filters, control core board and so on, has been given a detailed description, especially on the magnetic core components and the filter in the main circuit, and the methods of the driving signal acquisition with the dead band time. The paper uses DSP+CPLD as its development platform. Digital signal processor (DSP) is mainly to complete the acquisition of analog signal and generate pulse width modulation (PWM). Complex programmable logic device (CPLD) is responsible for digital logical operation. Through the analysis of the experimental waveforms, it has been proved that the de-coupling control strategy is suitable for this system. Finally, the thesis points out the shortcomings of the existing system, and gives some suggestions for improvement.