Anti-islanding protection system for distributed grid-connected system and protection method of anti-islanding protection system

A technology for distributed power generation and protection systems, applied in information technology support systems, emergency protection circuit devices, electrical components, etc. Maintenance personnel's life safety and other issues, it is not easy to achieve communication effect, accurate and reliable detection, cost-saving effect

Active Publication Date: 2013-05-29
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Endanger the life safety of electric maintenance personnel;
[0005] 2. Affect the protection switch action program on the power distribution system;
[0006] 3. The unstable nature of the power supply voltage and frequency in the isolated island area will cause damage to the electrical equipment;
[0007] 4. When the power supply is rest...

Method used

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  • Anti-islanding protection system for distributed grid-connected system and protection method of anti-islanding protection system
  • Anti-islanding protection system for distributed grid-connected system and protection method of anti-islanding protection system
  • Anti-islanding protection system for distributed grid-connected system and protection method of anti-islanding protection system

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Embodiment

[0053] The present invention provides a specific embodiment of the structure of the anti-islanding protection system of the distributed generation grid-connected system as follows: figure 2 shown, the specific description is as follows:

[0054] 1. Dispersion detection device 1

[0055] The decentralized detection device 1 is a microcomputer measurement and control protection device, which is installed at the outlet of the 10kV feeder of the substation on the system side, and the feeder is connected to the distributed photovoltaic power source. The distributed detection device 1 can collect analog signals such as three-phase voltage and frequency of the substation 10kV bus, and switch signals such as the position of the feeder switch, the substation main transformer, the low-voltage side switch and the segment switch, and perform data processing and logical judgment:

[0056] A. If it is detected that the busbar voltage or frequency is lower than the set value (the value is ...

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Abstract

The invention relates to an anti-islanding protection system for a distributed grid-connected system and a protection method of the anti-islanding protection system based on wave carrier communication and decentralized detection technology. The anti-islanding protection system comprises a decentralized detection device, a central detection device and a communication device. The decentralized detection device is used for acquiring the electrical capacity of the system and judging whether a public supply network loses power or not by data processing and logical judgment for the electrical capacity. The central detection device receives information from the decentralized detection device and logically judges the information to protect a common connection point of the distributed grid-connected system, and transmits a control instruction to a distributed power supply grid-connected point switch. The communication device is used for transmitting the information of the decentralized detection device to the central detection device and transmitting the control instruction of the central detection device to the distributed power supply grid-connected point switch. An upper carrier acquires the information of the supply network for islanding discrimination, a lower carrier controls the distributed power supply grid-connected point switch on a user side, a distributed power supply is cut off, islanding effects are prevented, and reliability and safety of the distributed grid-connected system are improved.

Description

technical field [0001] The invention relates to the technical field of distributed power generation, in particular to an anti-islanding protection system and a protection method for a distributed power generation grid-connected system. Background technique [0002] In recent years, the development of new energy power generation has been accelerated to cope with the energy crisis and the pressure brought by energy conservation and emission reduction. In the development of new energy power generation, distributed power generation including solar power generation, wind power generation, and biomass power generation has developed rapidly. A large number of distributed power sources are connected to the distribution network, which effectively improves the reliability of the distribution network, improves the power quality of regional power supply, and reduces network loss at the same time, resulting in significant economic benefits. However, the grid-connected operation of distr...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J13/00
CPCY04S10/20Y02E60/725Y02E60/00
Inventor 叶荣波姚虹春周昶崔红芬陶琼
Owner STATE GRID CORP OF CHINA
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