Two-region interconnected electric power system alternating current interconnection tie power fluctuation peak calculating method

A technology of AC tie line and power system, applied in AC network to reduce harmonics/ripples, harmonic reduction devices, etc., to achieve the effect of improving the level of safe and stable operation

Active Publication Date: 2010-09-29
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

As for the calculation of the peak value of AC tie line power fluctuation under dynamic disturbance, there is no relevant report yet

Method used

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  • Two-region interconnected electric power system alternating current interconnection tie power fluctuation peak calculating method
  • Two-region interconnected electric power system alternating current interconnection tie power fluctuation peak calculating method
  • Two-region interconnected electric power system alternating current interconnection tie power fluctuation peak calculating method

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Experimental program
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Embodiment Construction

[0047] When unit tripping or DC blocking occurs in the North China or Central China power grid, the active power of the UHV AC tie line will fluctuate greatly. Taking North China-Central China UHV AC connection line commissioning system as a disturbance test and removing #12 unit (700MW) of the Three Gorges Power Plant as an example, the rationality of the present invention is verified.

[0048] Step 1: Obtain the measured data of active power of the UHV line, such as figure 1 shown. From figure 1 It can be obtained that before the disturbance, the active power of the UHV Changnan I line was 1507MW; after the disturbance, the peak active power of the UHV Changnan I line was 2141.5MW, the active power variation of the UHV line was about 634.5MW, and the actual power transfer ratio was 90.64% . According to the eigenvalue analysis and the measured data, the oscillation frequency of the North China-Central China oscillation mode is about 0.15Hz, and the damping ratio is about ...

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Abstract

The invention provides a two-region interconnected electric power system alternating current interconnection tie power fluctuation peak calculating method. When the electric power system is in power vacancy, large power vibration can be generated on interconnection tie. The invention is based on the linear second-order system model of two-region electric power system interconnection tie power oscillation and calculates interconnection tie power fluctuation peak after fault by dynamic response of the second-order system. The invention can be applied to simulation analysis of electric power system, grasps the dynamic characteristic of two-region interconnected electric power system, is beneficial to system operation and analysis personnel to timely take effective measures and improves safety steady operation level of electric power system.

Description

technical field [0001] The invention relates to a power system analysis method, in particular to how to calculate the peak value of the power fluctuation of an AC tie line in a two-area interconnected power system, and belongs to the field of power systems. Background technique [0002] The Changzhi-Nanyang-Jingmen UHV test and demonstration project is the only AC connection line between the two major regional power grids in Central China and North China. Since the project was put into operation at the end of 2008, when there is a power shortage (such as tripping, DC blocking, etc.) in the Central China or North China power grid, large power fluctuations will occur on the UHV line. Substantial power fluctuations have become an important factor limiting the improvement of the transmission capacity of UHV tie lines, which has affected the social and economic benefits of UHV lines from fully exerting their large-scale power transmission. At present, as large-capacity DC projec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 汤涌孙华东易俊林伟芳
Owner CHINA ELECTRIC POWER RES INST
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