Photovoltaic power station and control method thereof
A photovoltaic power station, voltage technology, applied in the direction of photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of extended debugging period, different debugging progress, and inability to carry out debugging work, and achieve the effect of shortening the grid connection cycle
Inactive Publication Date: 2020-10-30
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
[0003] However, before the photovoltaic power station is connected to the grid, most of the equipment in the power station has no power supply and cannot be debugged. Usually, all the equipment in the photovoltaic power station is installed and the grid side is powered.
However, due to the different commissioning progress of electrical equipment from different manufacturers, the commissioning period is prolonged
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[0055] In the early stage of photovoltaic power station construction, if the insulation of the high voltage side cannot be guaranteed to meet the safety requirements, the inverter is not allowed to establish a power grid. To test whether the insulation of the high voltage side meets the safety requirements requires the use of testing instruments for high voltage insulation, such as withstand voltage testers , however, the withstand voltage instrument needs AC power supply to work normally, and when the high-voltage side of the photovoltaic power station is out of power, it cannot supply power for the withstand voltage instrument, and usually needs to use other power sources, such as diesel generators to supply power for electrical equipment. This method not only increases the debugging cost. In addition, before the high-voltage side is allowed to be charged, the construction tools on the power station site, such as electric welding machines and electric tools, cannot be used, t...
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The invention provides a photovoltaic power station and a control method thereof. According to the photovoltaic power station, a switching device is arranged between an inverter and a boosting transformer, a first end of the switching device is connected with the AC side of the inverter, a second end is connected with a low-voltage winding of the boosting transformer, and a third end is connectedwith an input end of distribution equipment, the direct-current side of the inverter is connected with a direct-current power supply, the high-voltage winding of the boosting transformer is connectedwith an alternating-current bus, and an output end of distribution equipment is connected with electric equipment. According to the photovoltaic power station, the self-built low-voltage power grid and the self-built high-voltage power grid are realized by controlling the branch circuits between different ends in the switch device to be communicated. A self-built low-voltage power grid is used forsupplying power to low-voltage equipment (such as a voltage withstanding instrument for testing high-voltage side insulation) in the system and electric equipment in a construction site, and partialsystem debugging work is carried out in advance.
Description
technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a photovoltaic power station and a control method thereof. Background technique [0002] A photovoltaic power station is a power generation system that converts solar energy into electrical energy and transmits it to the grid. Photovoltaic power plants usually include combiner boxes, inverters, transformers, monitoring equipment, and other control equipment. The completion of a photovoltaic power station requires a series of debugging tasks such as communication testing, troubleshooting, inverter function testing, and grid-connected debugging for the entire system. The photovoltaic power station can be connected to the grid to generate electricity after there is no problem in debugging. [0003] However, before the photovoltaic power station is connected to the grid, most of the equipment in the power station has no power supply and cannot be d...
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IPC IPC(8): H02J3/38
CPCH02J3/381H02J2300/24H02J2310/20Y02E10/56
Inventor 姚培梁城程林孙龙林丁杰
Owner SUNGROW POWER SUPPLY CO LTD