Research On Control System Of Matrix Converter For Permanent Magnet Synchronous Wind Power Generator

In recent years, the change of global climate and environmental problems are increasingly threatening the human living environment. As one of the most promising new energy resources, wind power draws more and more attention from different countries. Since permanent magnet synchronous wind power generator has no brushes, cancels the growth sector, has simple structure and works reliablly and so on, all those advantages make permanent magnet synchronous wind power generator much more prospecting in the wind energy field.Matrix converter is a new device of Alternating Current to Alternating Current (AC-AC) frequency conversion, which has excellent input and output characteristics. Comparing with the traditional AC conversion device, this new type has its outstanding performance:there is no energy storage components with great capacity of Direct Current (DC); the energy flows in both directions, it will make four-quadrant operation possible;input and output waveform could be realized as sinusoidal; can be adjusted freely the input power factor and so on. With the manufactured technology of the variable frequency power electronic devices'components and the development of research methods, the matrix converter has a profound impact in the energy area, AC variable voltage and variable frequency fields and electric drive. The structure of this article will be presented as follows:The research background, significance and the content of the research are presented; a description of the advantages and technology development background about the permanent magnet synchronous wind power generator and matrix converter is given, and the comparison and analysis of the several used switching power devices of matrix converte are made.The paper makes the theoretical derivation and analysis from the perspectives of circuit topology, four-step converter technology of switching power devices and space vector control strategies for matrix converter, constructs mathematical functions of matrix converter, obtains the switch combination function of virtual rectifier and inverter in the conditions that space vector modulation strategy of matrix converter, establishs a mathematical simulation model of matrix converter, and applicates MATLAB software to the voltage amplitude regulation, frequency conversion, and energy feedback aspects for matrix converter simulation, the simulation results show the excellent input and output performance.The present also describes the control structure principle and working parameters characteristics of permanent magnet synchronous wind power generator, establishes a three-phase stationary coordinate system and a two-phase synchronous rotating coordinate system to the permanent magnet synchronous wind power generator of mathematical model; utilizes vector control theory of permanent magnet synchronous wind generator, establishes permanent magnet based rotor flux oriented mathematical model for permanent magnet synchronous wind generator. on the basis of the previous, builds matrix converter and the permanent magnet synchronous wind power generator of the control system and establish the simulation model, which simulate the operating results in the power generation state, and completes decoupling control about the active and reactive power, and achieve stable operation of the system. The simulation results prove that this system is correct and feasible because of the good performance of the itself.Applying DSP chip as the main control and CPLD chip as the auxiliary control, the article constructs the system of matrix converter, designs the hardware structure and software structure of the program of matrix converter system, which includes the system main circuit, the external hardware circuit, control circuit and software design flow etc. Furthermore, the paper makes a profound research on matrix converter and permanent magnet synchronous wind power generator and a fundamentally theoretical research is also made.