Isolated grid operation stabilization control method for regional weak tie power grid

Abstract

The invention relates to an isolated grid operation stabilization control method based on a delivery manner of a regional weak tie power grid. The method is a dynamic simulation analyzing method based on tracks. According to a searching-verifying method and combining the voltage and frequency change tracks, the operating characteristics of the power grid under the condition of various delivery power are analyzed, the factors of the unit grid interfering protection of the regional power grid, the operating state change of the power grid, the over-speed protection of a generator unit, the high-week machine cutting measures of the regional power grid, linked machine cutting, low-frequency load decrease and the like are comprehensively considered, an isolated grid operation stabilization control strategy which is suitable for the delivery regional power grid for the requirements of the actual power grid is developed, and the second defense line and the third defense line of the regional power grid, and the over-speed protection allocation scheme of a generator are coordinated and optimized. Through the adoption of the stabilization control method, the isolated grid operation stabilization of the regional power grid can be ensured, the load loss can be reduced, the adaptability is better, the considered factors are more comprehensive, the certain practical value can be generated, and the promoted prospect is better.

Description

technical field [0001] The invention relates to a control method in the field of electric power system, in particular to a method for stabilizing the operation of an isolated regional weakly connected power grid. Background technique [0002] With the development of the power grid, a relatively strong 500kV main grid has been formed in most areas, with a reasonable structure, clear layers, and good safety and reliability. However, with the gradual development of the 500 / 220kV electromagnetic ring network de-ring work, the occurrence of local power grid failures, extreme weather or geological disasters, and human error may lead to the disconnection of the regional power grid with the main grid and the formation of isolated grids. network operation. After the failure, when the external transmission power of the power grid in some areas is large, the frequency of the regional power grid will rise beyond the limit after the formation of an isolated grid, which may seriously ca...

AI Technical Summary

Problems solved by technology

However, with the gradual development of the 500 / 220kV electromagnetic ring network de-ring work, the occurrence of local power grid failures, extreme weather or geological disasters, and human error may lead to the disconnection of the regional power grid with the main grid and the formation of isolated grids. network operation

After the failure, when the external power of the power grid in some areas is large, the frequency of the regional power grid will rise beyond the limit after the formation of an isolated grid, which may seriously cause the frequency collapse of the power grid and repeated oscillations of thermal power unit overspeed protection.

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