Control device and method of grid-connected photovoltaic power generation system, and photovoltaic direct-drive equipment
A photovoltaic power generation system and photovoltaic system technology, applied in the field of anti-islanding photovoltaic direct-drive air-conditioning systems and control devices for anti-islanding photovoltaic direct-drive air-conditioning systems, can solve problems such as safety hazards and isolated islands, so as to avoid serious safety hazards and realize isolated The effect of network operation
Pending Publication Date: 2021-04-30
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0005] The object of the present invention is to provide a control device, method and photovoltaic direct drive equipment for a grid-connected photovoltaic power generation system, so as to solve the problem of islanding phenomenon and serious safety hazards in the grid-connected photovoltaic power generation system when the grid fails and powers off, so as to achieve By avoiding the islanding phenomenon of the grid-connected photovoltaic power generation system when the power grid fails, the effect of avoiding the serious safety hazards caused by the islanding phenomenon
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[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] According to an embodiment of the present invention, a control device for a grid-connected photovoltaic power generation system is provided. see figure 1 A schematic structural view of an embodiment of the device of the present invention is shown. The grid-connected photovoltaic power generation system includes: a photovoltaic system and a power grid capa...
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The invention discloses a control device and method for a grid-connected photovoltaic power generation system, and photovoltaic direct-drive equipment. The control device comprises a control unit and a detection unit, wherein the control unit is configured to control a switch unit to be switched on under the condition that a power grid is not powered off, so as to control the photovoltaic direct-drive equipment to obtain electric energy from the power grid and the photovoltaic system; the detection unit is configured to detect the bus voltage of the power grid under the condition of power failure of the power grid and generate a power failure signal of the power grid under the condition that the bus voltage is lower than a set voltage; and the control unit is further configured to control the switch unit to be switched off according to the power grid power-down signal so as to cut off the photovoltaic direct-drive equipment from the power grid and control the photovoltaic direct-drive equipment to obtain electric energy from the photovoltaic system. According to the control device and the method, by avoiding the island phenomenon of the grid-connected photovoltaic power generation system when the power grid breaks down, serious safety hazards caused by the island phenomenon are avoided.
Description
technical field [0001] The invention belongs to the technical field of photovoltaic direct-drive equipment, and in particular relates to a control device and method for a grid-connected photovoltaic power generation system and photovoltaic direct-drive equipment (such as photovoltaic direct-drive air conditioners), in particular to a control system for anti-islanding photovoltaic direct-drive air conditioners A device, an anti-islanding photovoltaic direct-drive air-conditioning system, and a control method for the anti-islanding photovoltaic direct-drive air-conditioning system. Background technique [0002] With the rapid development of distributed power generation technology, in order to solve the power consumption problem of high-power electrical equipment such as air conditioners, the photovoltaic direct drive air conditioner that combines photovoltaic power generation technology with air conditioning systems provides a new solution to the power consumption problem of ai...
Claims
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Login to View More IPC IPC(8): H02J3/38
CPCH02J3/388H02J2300/24Y02E10/56
Inventor 李宏波李国耀李捐孙萍萍陈富平刘凯
Owner GREE ELECTRIC APPLIANCES INC