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A Method and System for Determining Transient Stability of an Island

A technology of transient stability and determination method, applied in complex mathematical operations, reducing/preventing power oscillation, AC network circuits, etc. The effect of improving calculation efficiency and ensuring accuracy

Active Publication Date: 2021-11-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

[0002] At present, the research on the transient stability of the power system is usually based on the method of optimizing the minimum unbalanced power. The relay protection system occupies an important position in the power system. However, in the current research, the power system relay protection The relay protection information provided by the system is separated from the system transient stability research, which leads to inaccurate research results on the transient stability of the power system

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  • A Method and System for Determining Transient Stability of an Island
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  • A Method and System for Determining Transient Stability of an Island

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Embodiment Construction

[0058] The purpose of the present invention is to provide a method and system for determining the transient stability of an isolated island, so as to realize the combination of the protection information provided by the relay protection device and the transient stability of the isolated island after disconnection, and improve the accuracy of the research results of the transient stability of the power system accuracy.

[0059] In order to make the above objects, features and advantages of the present invention more comprehensible, the invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0060] Such as figure 1 and 2 As shown, the present invention provides a method for determining the transient stability of an island, and the method includes the following steps:

[0061] Step 101, based on the power system dynamic equation of the generator, an analytical expression of the state vector of each generator ...

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Abstract

The invention discloses a method and system for determining the transient stability of an isolated island. The method is: based on the power system dynamic equation of the generator, the state vector analytical formula of each generator in the isolated island is established; the state vector analytical formula is transformed into COI Coordinate system, obtain the state vector analytical formula in the COI coordinate system of each generator in the island; based on the state vector analytical formula in the COI coordinate system of each generator, use the transient energy function of the island to calculate the transient state of the island Energy; based on the state vector analytical formula of each generator and the state vector analytical formula under the COI coordinate system, calculate the critical energy to stabilize the island; calculate the difference between the critical energy and the transient energy as the island stability margin ; and the island transient stability is determined according to the island stability margin. The invention combines the fault duration information that can be sensed by the relay protection, applies the energy function to the isolated island after separation, gets rid of the constraints of time domain simulation, and improves the calculation efficiency under the premise of ensuring accuracy.

Description

technical field [0001] The invention relates to the technical field of power system performance research, in particular to a method and system for determining transient stability of an isolated island. Background technique [0002] At present, the research on the transient stability of the power system is usually based on the method of optimizing the minimum unbalanced power. The relay protection system occupies an important position in the power system. However, in the current research, the power system relay protection The relay protection information provided by the system is separated from the transient stability research of the system, which leads to inaccurate research results of the transient stability of the power system. How to combine the protection information provided by the relay protection device with the transient stability of the isolated island to improve the accuracy of the research results of the transient stability of the power system has become an urgent...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10
CPCH02J3/24H02J3/388H02J2203/10H02J2203/20
Inventor 王增平王彤相禹维张岩迟忠君张玉佳马慧远邵文君孟颖时伯年秦红霞张璇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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