雙向光伏微型逆變器的研究
[Abstract]:In view of the severe energy situation in China and the negative impact of traditional energy generation on production, living and ecological environment, the country actively promotes new energy generation. Photovoltaic miniature inverters have attracted much attention because of their advantages such as stability, reliability, flexible configuration, high efficiency and cleanliness. Increasing the miniature inverter of battery module can effectively reduce the influence of weather factors on the reliability of the inverter and improve the energy utilization ratio of photovoltaic panels. In this paper, the photovoltaic miniature inverter is studied. Firstly, the working mode of simple parallel-off-grid miniature inverter (traditional miniature inverter) is analyzed. Firstly, the mathematical model of flyback circuit is established, and the maximum power tracking (Maximum Power Point Tracking,MPPT) technique is introduced in grid-connected mode. In order to realize the sinusoidal current without difference tracking, an adaptive resonant controller is introduced in this paper. Then the controller of the power system and the load part are designed in parallel and off-grid mode, and the control effect is verified by simulation. Secondly, in order to solve the problem of low energy utilization of photovoltaic panels in miniature inverters, this paper mainly introduces the addition of battery modules on the basis of traditional miniature inverters. A bidirectional DC/DC circuit is designed, and the topology of unidirectional flyback circuit and inverter circuit is improved. The new bi-directional flyback circuit and bidirectional DC-AC circuit make the energy can be transferred bidirectionally in micro-inverse circuit and battery circuit. The mathematical models of the boost chopper circuit and the step-down chopper circuit are built, and the operation modes of the improved miniature inverter under different illumination conditions are analyzed. Then, the controller of the battery part is designed separately in the parallel off-grid mode. The control effect of the four working modes is verified in the simulation. Thirdly, because the output power of the miniature inverter is only several hundred watts, in order to improve the system efficiency, the hardware loss of the system should be reduced as much as possible, so the parameters of each component of the main power board are strictly designed in this paper. At the same time, the loss of each part of the circuit is modeled by the control variable method. When the operating frequency or input power of the system changes, the losses of the system under different flyback circuit topologies are compared, and an experimental platform is built to test the system efficiency and select the optimal working topology. Fourthly, the physical experiment platform of 250 W photovoltaic miniature inverter is built to verify the control method and output waveform in the new mode.
【學(xué)位授予單位】:南昌航空大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM464
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