A buck-boost photovoltaic grid-connected inverter
A buck-boost and inverter technology, which is applied in photovoltaic power generation, single-network parallel feed arrangement, AC power input conversion to DC power output, etc., can solve the problem of low degree of freedom and small change range of grid-connected inverters etc. to achieve high power conversion efficiency, wide range of variation, and improved efficiency and reliability
Active Publication Date: 2021-07-13
SHANGHAI MARITIME UNIVERSITY
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[0009] The purpose of the present invention is to provide a buck-boost photovoltaic grid-connected inverter to solve the problems of low degree of freedom in the operation of the grid-connected inverter and the small range of adaptation to the input DC voltage
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[0038] The photovoltaic grid-connected inverter proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that the drawings are all in a very simplified form and use imprecise ratios, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.
[0039] The core idea of the present invention is that the photovoltaic grid-connected inverter provided by the present invention has only one switch tube working in the high-frequency state at any time, wherein the fourth power switch and the eighth power switch are power frequency switches, and the first mode switching switch and the second mode switching switch are two low-frequency switches that are opened or closed at the same time, and the switching loss ...
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The present invention proposes a buck-boost photovoltaic grid-connected inverter, including: a first mode switching switch; a second mode switching switch; a first inverter circuit; a second inverter circuit; a filter capacitor for the first inverter circuit and The alternating current output by the second inverter circuit is filtered; the detection circuit detects the DC voltage across the first smoothing capacitor, the DC voltage across the second smoothing capacitor, the grid AC voltage, the current in the first DC inductor and the second DC sense the current, and feed back the detected value to the control circuit; the control circuit makes a judgment on the current working mode and working state according to the value detected by the detection circuit, and switches to the first mode switching switch, the second mode switching switch, The controlled terminals of the first to eighth power switches send switch control signals. The buck-boost photovoltaic grid-connected inverter makes the device work in a safe and efficient state to improve the efficiency and reliability of the inverter system.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a buck-boost photovoltaic grid-connected inverter. Background technique [0002] The grid-connected inverter is mainly used to convert the direct current generated by the energy equipment into the alternating current required by the grid. According to different energy equipment, grid-connected inverters can generally be divided into grid-connected inverters for photovoltaic power generation, grid-connected inverters for wind power generation, and grid-connected inverters for power equipment power generation. [0003] Various types of grid-connected inverters exist in the prior art. For example, according to the different nature of the DC side power supply, it can be divided into voltage source type grid-connected inverter and current source type grid-connected inverter; according to the different isolation methods, it can be divided into isolated type grid-connected in...
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IPC IPC(8): H02M7/537H02J3/38
CPCH02M7/537Y02E10/56
Inventor 吴卫民王侯清安丽琼
Owner SHANGHAI MARITIME UNIVERSITY