Method and system for detecting distributed power supply isolated island

A distributed power supply and island detection technology, which is applied in power supply testing and other directions, can solve the problems of long detection time, inability to meet the time requirements of distributed power supply, heavy noise interference of distributed power supply, etc., and achieve the effect of meeting the time requirement

Active Publication Date: 2017-02-22
MAOMING POWER SUPPLY BUREAU GUANGDONG POWER GRID CORP
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Problems solved by technology

The noise interference in the distributed power supply is heavy, and it is necessary to detect the island operation as quickly as possible. However, when the traditional island detection method is used for the island detection of the distributed power supply, the detection time is long, which cannot meet the time for the island detection of the distributed power supply. need

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  • Method and system for detecting distributed power supply isolated island
  • Method and system for detecting distributed power supply isolated island
  • Method and system for detecting distributed power supply isolated island

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Embodiment 1

[0023] Embodiment 1 of the present invention provides a distributed power island detection method, see figure 1 As shown in FIG. 1 , it is a schematic flowchart of the implementation of the distributed power island detection method according to Embodiment 1 of the present invention. Such as figure 1 As shown, the distributed power island detection method of the first embodiment includes the following steps:

[0024] Step S101: Periodically send a power frequency modulation signal at the 10kV bus of the substation, and the power frequency modulation signal is transmitted to the distributed power supply side through the power line;

[0025] Here, the power frequency modulation signal is generally a power line zero-crossing power frequency communication signal, which can be obtained by modulating the voltage zero-crossing signal through pseudo-random sequence coding.

[0026] Step S102: Sampling the transmission signal in the power line at the distributed power supply side to o...

Embodiment 2

[0043] According to the distributed power island detection method in the above embodiments, the present invention further provides a distributed power island detection device. figure 2 It is a schematic diagram of the composition and structure of the distributed power supply islanding detection device according to the second embodiment of the present invention. Such as figure 2 As shown, the distributed power island detection device of Embodiment 2 includes a power frequency communication signal generator 201 installed at the 10kV bus of the substation, a signal receiving device 202 arranged on the distributed power side, and connected to the signal receiving device The signal processing device 203;

[0044] The power frequency communication signal generator 201 is used to periodically send a power frequency modulation signal, and the power frequency modulation signal is transmitted to the distributed power supply side through the power line;

[0045] The signal receiving ...

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Abstract

The invention relates to a method and system for detecting a distributed power supply isolated island. The method comprises the following steps: periodically transmitting a power frequency modulation signal at a 10kV bus of a substation, and transmitting the power frequency modulation signal to a distributed power supply side through a power line; sampling a transmission signal in the power line on the distributed power supply side to obtain a voltage receiving signal; acquiring periodic synchronous detection information and energy time distribution information of the voltage receiving signal according to the voltage receiving signal; and performing isolated island operation detection on the distributed power supply side by combining the periodic synchronous detection information and the energy time distribution information. By adopting the scheme, isolated island operation of a corresponding distributed power supply can be detected in two seconds of the isolated island operation of the distributed power supply, and the time requirement for detecting the distributed power supply isolated island can be met.

Description

technical field [0001] The invention relates to the technical field of islanding detection, in particular to a distributed power islanding detection method and system. Background technique [0002] Island operation means that when the main grid stops supplying power due to misoperation, failure or natural factors, the distributed power generation fails to detect the interruption of the main grid and continues to operate, thus forming a power supply network that loses control of the main grid. In the Energy Internet, the protection against island operation when renewable distributed power is connected to the grid is one of the key issues. [0003] Traditional island detection methods can be roughly divided into two categories: external detection methods and internal detection methods. Among them, the internal detection method is to cause the system state to deviate from the normal range through the voltage state of the common coupling point or the disturbance of the injected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/40
CPCG01R31/40
Inventor 朱子坤赵必游周聪殷海森曾建鑫胡铁斌李剑桥胡云石杨永邓刘毅
Owner MAOMING POWER SUPPLY BUREAU GUANGDONG POWER GRID CORP
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