An anti-islanding protection system and method

Abstract

The invention discloses an anti-isolation protection system and method. The system includes a station domain island detection device, a wireless communication system and an anti-isolation protection device; the station domain island detection device is used to collect the positions of each circuit breaker in a substation and detect the public power grid in real time Whether the power is lost and an island is formed, and a message is sent to the anti-islanding protection device through the wireless communication system; the anti-islanding protection device transmits and receives the communication message sent by the station domain island detection device through the wireless communication system, and collects the distributed power station The voltage and frequency at the public connection point, when any of the following conditions are met: 1) Receive a wireless jump message; 2) The wireless communication is normal and meets the low / over-frequency and low / over-voltage non-sensitive segment criteria; 3 ) Abnormal wireless communication, meet the low / over-frequency and low / over-voltage sensitive segment criteria, and control the tripping of the circuit breaker at the common connection point. The invention has the characteristics of improving the economy of the anti-islanding protection system and the sensitivity and reliability of the anti-islanding protection.

Description

technical field [0001] The invention relates to an anti-islanding protection system and method, and belongs to the technical field of distributed power generation. Background technique [0002] The island effect is an important problem in the grid-connection of distributed power generation. The so-called island effect means that when the power company jumps due to power supply failure or outage maintenance, the grid-connected power generation system at each user end and the surrounding load form a power company that cannot Self-powered islands under control. This self-sufficient island phenomenon will have serious consequences for maintenance personnel, electrical equipment, and even the power grid. Therefore, the distributed generation system must be able to detect the occurrence of the island effect in a timely manner. In order to quickly and accurately detect the islanding effect, the power company generally requires an anti-islanding protection device to be installed at...

AI Technical Summary

Problems solved by technology

The active principle generally needs to apply a disturbance signal to the power grid, which is complicated to implement and affects the power quality, so it is rarely used in relay protection devices; The advantage is that the principle is simple and easy to implement, but the detection has a certain blind spot; it is the most direct method for island detection, and it has the characteristics of high sensitivity and quick action by detecting the position of the switch in real time to determine whether the grid-connected system has islands. , but the use of optical fiber communication requires the laying of optical fibers, which is easily constrained by economy and inconvenient construction, and it is difficult to implement in many occasions

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