| This thesis first introduces the research background of micro-grid inverter; then introduces the principle of distributed generation, and the structure of the micro-grid; next analyze the problems caused by the micro-grid inverter and detail as well as the solution, finally introduces the development situation of micro-grid technology at home and abroad. Endly, we introduce and analyze the working principle of single-phase and three-phase micro-grid inverter and its modulation method. Along with our country put forward the construction of "smart grid", the micro grid technology arises at the historic moment. Micro-grid, as a new type of network structure, is a system unit composed of micro power, energy storage system, load and control system. Micro-grid has huge advantage in management of distributed power generation energy, it effectively relieves the impact caused by the distributed generation which connect to the power grid directly, and reduce the cost.Based on the traditional micro-grid inverter control strategy, this thesis joined the harmonic suppression function. This makes micro-grid inverter compensate the harmonic released by active load while delivering electricity to the micro-grid at the same time, and then formate joint control of active power, reactive powerand harmonic.This thesis first introduces the research background of micro-grid inverter; then introduces the principle of distributed generation, and the structure of the micro-grid; next analyze the problems caused by the micro-grid inverter and detail as well as the solution; finally introduces the development situation of micro-grid technology at home and abroad. Endly, we introduce and analyze the working principle of single-phase and three-phase micro-grid inverter and its modulation method.After this, we add the function of harmonic detection and suppression in the designing of micro-grid inverter, and analysis and design of the harmonic current detection method based on instantaneous reactive poweri_p-i_qfrom the angle of theoretical derivation.Then, on the basis of theoretical analysis, designed the overall scheme of micro-grid three-phase inverter. Based on this, we sinmulink the inverter harmonic detection section, the double closed loop control system and the micro-grid subsystem which has no harmonic suppression function under the environment of MATLAB/Simulink, and get relevant waveform. Finally combine each subsystem, simulate the system active power transport, and do to output current and output voltage harmonic spectrum analysis, illustrate the correctness of the designed system.Finally, we analyze and design the hardware circuit and the main circuit control unit of three-phase inverter system, then design the system software, including main circuit program designing, and then analysis the experimental. |
PDF Full Text Request