基于DSP28335的光伏逆變器研究
[Abstract]:With the rapid development of the social economy, the energy consumption is getting more and more, and the burning of the fossil energy also brings serious environmental pollution. Therefore, it is of great significance to study the sustainable development of mankind with new energy. As a kind of renewable clean energy, the solar energy has become the hot spot of modern new energy because of its inexhaustible supply, wide application range and no pollution. Therefore, this paper analyses and designs the free-standing three-phase photovoltaic inverter. The independent photovoltaic power generation system is composed of a photovoltaic cell array, a boost converter, a storage battery, a three-phase full-bridge inverter and the like. In order to make full use of the electric energy of the photovoltaic array, three kinds of control methods such as the output characteristic of the photovoltaic cell and the maximum power point tracking (MPPT), the conductance increment method, the voltage feedback method and the like are analyzed, and the maximum power output of the photovoltaic array is finally realized by using the disturbance observation method. According to the free-standing photovoltaic power generation system, when the photovoltaic array has insufficient power generation, the storage battery is required to supply power to the load, and the charge-discharge control method of the storage battery is determined. The three-phase full-bridge inverter adopts a double-closed-loop control strategy based on the feedforward decoupling current inner loop and the voltage outer loop, and uses the SVPWM algorithm to generate the PWM wave of the on-off of the inverter power switch tube. The simulation model is set up in the Simulink environment. The results show that the disturbance observation method is good to follow the maximum power point of the PV array, and the output waveform of the inverter is stable. Finally, the control circuit is designed with the TMS320F28335 of TI company as the main control chip, including the hardware circuit design of driving and sampling and the maximum power tracking program, the inverter control program and the charge-discharge program design of the storage battery based on the CCS5.5 compiling environment. The experiment platform is set up based on the hardware and software design of the circuit, and the designed photovoltaic inverter power supply is analyzed and the rationality of the design is further verified.
【學(xué)位授予單位】:西安科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM464
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