Island detection method and device and photovoltaic grid-connected power generation system
A grid-connected power generation and photovoltaic technology, which is applied in the field of island detection and photovoltaic grid-connected power generation systems, can solve the problems of misjudgment or omission, detection parameters cannot be adjusted according to local conditions, and detection parameters are unreasonable, so as to improve detection accuracy, The effect of reducing workload
Active Publication Date: 2020-07-03
SHENZHEN SOFAR SOLAR
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Problems solved by technology
Among them, the detection parameters cannot be adjusted reasonably according to local conditions, and it is easy to have unreasonable detection parameters, resulting in misjudgment or missed judgment.
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[0050] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0051] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.
[0052] It should be noted that, if there is no conflict, various features in th...
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The embodiment of the invention relates to the field of photovoltaic grid-connected power generation, and discloses an island detection method, which is applied to a photovoltaic grid-connected powergeneration system connected with an external power grid. The method comprises the following steps: obtaining island detection parameters from a storage unit of the photovoltaic grid-connected power generation system; acquiring electrical parameters of a photovoltaic grid-connected power generation system connected with the external power grid; performing island detection on the photovoltaic grid-connected power generation system according to the electrical parameters and the island detection parameters; if the photovoltaic grid-connected power generation system has an island, recording the duration of the photovoltaic grid-connected power generation system in the island; acquiring electrical parameters of an external power grid when the duration of the photovoltaic grid-connected power generation system in the island is less than a preset threshold within a preset time period; and adjusting the island detection parameters according to the acquired electrical parameters of the externalpower grid. Therefore, island detection parameters are automatically adjusted to adapt to different power grid environments, the detection accuracy can be improved, and the workload of power grid maintenance is reduced.
Description
technical field [0001] Embodiments of the present invention relate to the field of photovoltaic grid-connected power generation, and in particular to a method and device for detecting isolated islands and a photovoltaic grid-connected power generation system. Background technique [0002] Photovoltaic grid-connected power generation uses photovoltaic arrays to convert the received solar radiation energy into high-voltage direct current after high-frequency direct current conversion, and then outputs a sinusoidal alternating current with the same frequency and phase as the grid voltage to the grid after being inverted by the inverter, thereby converting solar energy Converted into electrical energy, has been more and more widely used. However, the island effect has always been a common problem in photovoltaic grid-connected power generation systems. The island effect refers to the failure of the photovoltaic grid-connected power generation system to detect the power failure i...
Claims
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IPC IPC(8): G01R31/00G01R31/12G01R23/00G01R19/165H02J3/38
CPCG01R31/00G01R31/12G01R23/00G01R19/165Y02E10/56
Inventor 刘江波易德刚资志翔
Owner SHENZHEN SOFAR SOLAR