Generalized driving energy analysis method for vibration coupling of large regional power grid and provincial power grids

Abstract

The invention provides a generalized driving energy analysis method for vibration coupling of a large regional power grid and provincial power grids. The method comprises the following steps: (1), building a static power flow model and a stable calculation model of an interconnected power grid, (2) scanning a small interfering frequency domain characteristic root, and screening a leading electromechanical oscillation mode of the extra-high voltage interconnected power grid and the provincial power grids, (3) determining a call wire between an extra-high voltage communication channel falling point power grid and other provincial power grids, (4) defining generalized driving energy of large-disturbance oscillation of the extra-high voltage power grid and the provincial power grids, (5) determining the relevance of the vibration coupling of the extra-high voltage power grid and the provincial power grids, and (6) analyzing factors which affect the generalized driving energy, and making relevant measures. By means of the method, the vibration coupling characteristics between the extra-high voltage power grid and the provincial power grids are analyzed, on the basis, the measure of reducing the generalized driving energy to relieve the relevant coupling effect is brought forward, and safe and stable operation capacity of the interconnected power grid crossing a large region can be improved.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a generalized drive energy analysis method for oscillation coupling of a regional power grid and a provincial power grid. Background technique [0002] my country's coal resources are mainly distributed in Shanxi, Shaanxi, and western Mongolia, hydropower resources are mainly distributed in Sichuan, Yunnan and other regions, wind energy resources are mainly distributed in Gansu, Xinjiang, Zhangbei and other regions, and load centers are mainly distributed in the central and eastern regions. economic developed area. The natural nature of the reverse distribution of primary energy and load centers determines that in order to achieve optimal allocation of resources and improve energy utilization efficiency, it is necessary to develop large-capacity UHV AC and DC transmission technologies to achieve optimal allocation of energy across regions. [0003] After the regi...

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Problems solved by technology

[0004] UHV interconnected large power grid is a typical nonlinear system, and its dynamic behavior after being disturbed is very complex. After a large disturbance fault, the mechanism analysis of the oscillation coupling between the provincial power grid and the UHV interconnected grid and the evaluation method of the coupling degree are still blank. state

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