Three-segment out-of-step self-adaptive disconnecting method

Abstract

The invention discloses a three-segment out-of-step self-adaptive disconnecting method. The method utilizes effective rapid detection to judge system out-of-step and accurately measure criterions of aThe invention discloses a three-segment out-of-step self-adaptive disconnecting method. The method utilizes effective rapid detection to judge system out-of-step and accurately measure criterions of an oscillation center, and performs disconnecting judgment in three segments according to whether the oscillation center is in a protection scope of a device-installing position during the out-of-step,n oscillation center, and performs disconnecting judgment in three segments according to whether the oscillation center is in a protection scope of a device-installing position during the out-of-step, thus an out-of-step disconnecting device can perform self-adaptive judgment for disconnection as a relay protection device so as to provide convenience for setting fixed values of users and adapt tothus an out-of-step disconnecting device can perform self-adaptive judgment for disconnection as a relay protection device so as to provide convenience for setting fixed values of users and adapt tothe changes of system modes. Therefore, the out-of-step disconnecting device as a third defense line of a power system can rapidly and accurately act so as to guarantee the safe steady operation of ththe changes of system modes. Therefore, the out-of-step disconnecting device as a third defense line of a power system can rapidly and accurately act so as to guarantee the safe steady operation of the power system.e power system.

Description

technical field [0001] The invention belongs to the technical field of power system automation. More precisely, the invention is a new criterion design for judging system out-of-synchronization based on local electrical quantities and adopting a three-stage self-adaptive decoupling according to the position of the oscillation center. method. Background technique [0002] With the construction of the UHV power grid, the connection between the regional power grids has been greatly strengthened, and the stability characteristics have become more complex. It is urgent to study the power grid decoupling control technology in extreme emergencies. Principle When judging the out-of-synchronization oscillation of the line, it needs at least one oscillation period of judgment time, and due to the uncertainty of the oscillation center, it is difficult for each out-of-synchronization decoupling device to cooperate with each other, which cannot fully meet the needs of power grid stabilit...

AI Technical Summary

Problems solved by technology

But in fact, due to the complex operation mode of the power grid, the out-of-step oscillation center does not fall in the predicted position in many cases, and it is inaccurate to locate the oscillation center by low voltage or conventional impedance in a multi-machine system, and even the difference is very large. large, which may lead to misoperation or refusal of the device and have serious consequences

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