Method and device for open-circuit overvoltage protection of solar cell array, and inverter
A solar cell and overvoltage protection technology, applied in the field of solar power generation, can solve problems such as high voltage connected to the BUS busbar, excessive stress of MOS transistors, etc.
Active Publication Date: 2019-07-19
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology
[0004] However, the inverter includes low-voltage devices inside, such as metal oxide semiconductor (MOS) transistors in the boost circuit. In the case of high open-circuit voltage of the PV panel, if there are no other measures and means, it should be connected to the BUS The bus voltage is also relatively high. If the inverter is started and connected to the grid, the stress of the MOS transistor will exceed the standard.
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[0024] figure 1 An example of a system architecture applicable to the embodiment of the present invention is shown. Based on the system architecture, the control of the open-circuit overvoltage protection of the solar cell array can be realized. The system architecture of the open-circuit overvoltage protection of the solar cell array provided by the embodiment of the present invention Including PV panel 100 , inverter 200 and grid 300 . The DC power generated by the PV battery panel 100 is incorporated into the grid 300 after being inverted by the inverter 200, and the PV battery panel 100 can charge the busbar (BUS) capacitor in the inverter 200 to supply power for the inverter 200, wherein , the voltage across the bus capacitor can also be called the bus voltage.
[0025] Such as figure 1 As shown, the inverter 200 mainly includes a processor 201 and a detection circuit 202, wherein the inverter 200 may at least include a boost circuit 203, an inverter circuit 204, a prot...
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The invention relates to a method and device for open circuit overvoltage protection of a solar battery array and an inverter. The method includes the following steps: an inverter detects an open circuit voltage of a PV battery panel, an inductive current of a booster circuit and a voltage of a bus capacitor; when the open circuit voltage of the PV battery panel rises to a first voltage threshold value, the inductive current of the booster circuit is controlled to be between a first current threshold value and a second current threshold value, so that the open circuit voltage of the PC battery panel drops, when the open circuit voltage of the PV battery panel drops to a second voltage threshold value, the PV battery panel is controlled to be shorted, the voltage of the bus capacitor is reduced through a load connected with the bus capacitor, and the inverter is started when the voltage of the bus capacitor is lower than a third voltage threshold value. The inverter controls the inductive current of the booster circuit to be between the first current threshold value and the second current threshold value, so that the open circuit voltage of the PV battery panel drops, thereby achieving the effect that the inverter is protected and is started without damage when the open circuit voltage of the PV battery panel is too high.
Description
technical field [0001] The invention relates to the technical field of solar power generation, in particular to a method and device for open-circuit overvoltage protection of a solar battery array, and an inverter. Background technique [0002] Solar energy (English: photo-voltaic, PV) panels convert the sun's light energy into electrical energy. Because they are not limited by the geographical distribution of resources, they can generate electricity near the place where the electricity is used, the time it takes to obtain energy is short, and the energy quality is high. advantages and are widely used. [0003] Inverter, also known as solar inverter, is an inverter powered by PV panels. Its main function is to invert the DC power generated by PV panels into AC power and feed it into the power grid. The PV panel supplies power to the inverter by charging the capacitor of the bus (BUS), and the voltage across the capacitor of the bus (BUS) is the BUS voltage, that is to say, ...
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IPC IPC(8): H02M3/156H02J11/00H02J3/38
CPCH02J3/383H02J11/00H02M3/156Y02E10/56
Inventor 林建飞高拥兵郭新
Owner HUAWEI DIGITAL POWER TECH CO LTD