Distributed power generation system and its islanding detection method, device, and converter
A technology of distributed power generation and island detection, which is applied in the field of devices, converters, and island detection methods, can solve problems such as complex control, small detection blind area, and reduced power generation efficiency of grid-connected equipment, so as to overcome detection blind areas and avoid harmonics The effect of increasing content
Active Publication Date: 2016-12-28
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
This method has high detection accuracy and small detection blind area, but the control is relatively complicated
For example, the active disturbance current injection method is used in the grid-connected power generation equipment, which leads to an increase in the harmonic content of the output current of the converter, and reduces the efficiency of power generation of the grid-connected equipment in the system
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[0053] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0054] The embodiment of the present application provides an islanding detection method, device, converter and distributed power generation system, which can quickly and accurately detect the occurrence of the islanding effect, basically eliminate detection blind spots, avoid increasing harmonic content and reduce grid connection in the system The power generation efficiency of the equipment.
[0055] See figure 1 , is a schematic diagram of Embodiment 1 of the island detection method prov...
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The present application discloses an island detection method. The island detection method includes: controlling the switching module to be turned off, so as to realize the disconnection of the capacitor module composed of a plurality of capacitors from the public connection point of the distributed power generation system; controlling the switching The module is closed to realize the connection between the capacitor module composed of multiple capacitors and the common connection point of the distributed generation system; the impedance value at the common connection point is obtained; the impedance value is compared with the impedance threshold, if the impedance value is greater than the impedance threshold And if the duration exceeds the preset duration, it is judged that the island effect occurs. This application also discloses an islanding detection device, a grid-connected converter and a distributed power generation system, which can quickly and accurately detect the occurrence of the islanding effect, basically eliminate detection blind spots, avoid increasing harmonic content and reduce grid connection in the system The power generation efficiency of the equipment.
Description
technical field [0001] The present application relates to the technical field of grid-connected power generation, and in particular to a distributed power generation system and an islanding detection method, device, and converter applied to the distributed power generation system. Background technique [0002] In the existing power supply system, when the grid interrupts the power supply due to faults and other reasons, the entire system will form an island disconnected from the grid with the surrounding loads. If there are grid-connected converters or other grid-connected power generation equipment in the power supply system, it may cause damage to the equipment and threaten the personal safety of the staff. Therefore, it must be able to detect quickly when the island state occurs. [0003] Traditional islanding detection methods are divided into two types: passive and active. Passive detection is mainly to judge the islanding effect on the change of Point of Common Coupli...
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IPC IPC(8): H02J3/38G01R31/08
Inventor 胡超赵为
Owner SUNGROW POWER SUPPLY CO LTD