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Island detection method, device and system of photovoltaic grid-connected power generating system

A technology for grid-connected power generation and island detection. It is used in photovoltaic power generation, single-grid parallel feeding arrangement, etc. It can solve the problems of power quality impact and small detection blind area, so as to improve power quality, reduce detection blind area, and ensure island detection efficiency. Effect

Active Publication Date: 2011-01-12
SHENZHEN HONGYAN ELECTRIC CONTROL EQUIP
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Problems solved by technology

The detection blind area of ​​this active detection is small, but it will have a certain impact on the power quality

Method used

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  • Island detection method, device and system of photovoltaic grid-connected power generating system
  • Island detection method, device and system of photovoltaic grid-connected power generating system
  • Island detection method, device and system of photovoltaic grid-connected power generating system

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Embodiment Construction

[0040] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] The present invention mainly aims at the shortcomings of the active detection method and the passive detection method in the island detection of the photovoltaic grid-connected power generation system, and integrates the active detection method and the passive detection method, which can not only make reasonable use of resources, but also reduce detection blind spots, Timely and effective detection of islanding phenomenon.

[0042] figure 2 It is a schematic flowchart of an embodiment of an islanding detection method for a photovoltaic grid-connected power generation system according to the present invention.

[0043] The islanding detection method of the photovoltaic grid-connected power generation system in this embodiment includes the following steps:

[0044] Step S10, detecting the load power in the pho...

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Abstract

The invention relates to an island detection method of a photovoltaic grid-connected power generating system, which comprises the following steps of: detecting load power in a photovoltaic grid-connected power generating system; judging whether the load power is matched with the output power of a preset inverter or not, if so, selecting an active detection mode for carrying out island detection; and otherwise, selecting a passive detection mode for carrying out island detection. Correspondingly, the invention also relates to an island detection device and a photovoltaic grid-connected power generating system. By combining active island detection with passive island detection, the invention not only reduces a detecting blind area and effectively ensures island detection efficiency but alsoimproves electric energy quality.

Description

technical field [0001] The invention relates to the technical field of photovoltaic grid-connected power generation, in particular to an island detection method, device and system for a photovoltaic grid-connected power generation system. Background technique [0002] With the development of the economy, people's demand for energy is also increasing, and the existing energy is in serious shortage. Therefore, solar energy has become one of the most ideal and environmentally friendly energy sources today, and has been more and more widely used. The utilization of solar energy mainly includes thermal utilization, chemical utilization and photovoltaic utilization. The main forms of heat utilization are solar water heaters, solar buildings and solar thermal power generation. Photochemical utilization mainly refers to new technologies in solar photosynthesis, solar chemical storage, solar catalytic photolysis of water to produce hydrogen, and solar photoelectric chemical conversi...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 欧阳万里
Owner SHENZHEN HONGYAN ELECTRIC CONTROL EQUIP
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