一種新型光伏微逆變裝置研制
[Abstract]:Photovoltaic power generation is an important way to utilize and develop clean energy, but the centralized PV inverter has the disadvantages of large volume, high cost and poor reliability, which makes it difficult to popularize photovoltaic power generation products in the field of civil use. Aiming at this problem, this paper takes flyback inverter as the research object, optimizes its working state, develops the flyback miniature inverter based on soft switch, and completes the corresponding hardware design and software design. A 250 W prototype was made to carry out the experiment. In this paper, the advantages and disadvantages of the topology of several mainstream miniature inverters are summarized, and a novel single-stage flyback photovoltaic grid-connected inverter with zero-voltage switching mode is proposed. The main circuit of the inverter is flyback converter. Two-way switch is used in the secondary side switch, which can make the main switch work in the soft switching state and improve the power transmission ability of the device. The circuit working state of the device in the switching cycle and the power frequency cycle is analyzed, and the hardware design of the system is completed, including the selection of the main circuit device, the design of the sampling circuit and the design of the control circuit. Based on the analysis of the small signal model of the main circuit, the software design of the system is completed, including grid-connected current control, maximum power point tracking control and so on. The operation characteristics of the circuit topology are simulated by using Simulink software, which verifies the rationality of the main circuit design and the effectiveness of the control system design. A series of experiments and tests are carried out on the experimental prototype. The experimental results show that the experimental prototype can realize the basic functions of the miniature inverter.
【學(xué)位授予單位】:哈爾濱理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM464
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