| The micro-turbine power generating sets are composed of turbine, compressor, combustion chamber, regenerator, bearings, high speed generator, power conversion system and oil injection system, etc. It is a kind of electric power generation device of environmental protection. It can be used in many fields, such as normal electrical source or emergency electrical power, the distributed power generation and cogeneration of cooling or heating and power and hybrid power units for automobiles and cogeneration of fuel cell-gas turbine, etc. So the study on this type of power sets is of major practical significance.The main work of the thesis is as follow.On the basis of analyzing the development status quo of the micro-turbine power generating sets and electric power conversion and control technology, the design schemes about power conversion system of the micro-turbine power generating sets are proposed according to the designed request.The mathematic models of the designed scheme are built. And the simulation analysis has been done. The simulation results show the feasibility of the proposed scheme including the start-up converter, DC lopper, main inverter and active power filter.According to the designed scheme and the fact request of the project, the hardware and software of the control system are designed. Due to using the PIC16F877 single-chip microcomputer as a main processor, the electronic components are reduced and the peripheral circuit is simplified. The program is made by PIC assembly language and the 3-phase pulse width modulation engine SA4828 is used in the system. The intelligent power module is adopted in the main circuit of the start-up converter.Some key problems have been settled. For examples, using DC lopper to stabilize the input voltage of the main inverter, using the start-up converter as an active power filter to eliminate the harmonic component of high-speed generator and using LC filter to enable PWMwave change into sinusoidal wave.
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