A solution method for thermal stability limit boundary of multi-dimensional space section in power system

Abstract

A solving method for a power system multi-dimensional space cross section thermal stability limit boundary includes calculating power transmission distributed factors of power system generator capability change on cross section circuits according to a direct-current power flow model; selecting a sensitive unit or a cluster having remarkable effects on cross section power flow according to the power transmission distributed factors; using active capability of the sensitive unit or the cluster as the multi-dimensional space coordinate axis, using power flow practicable circuit thermal stability constraint meeting the N-1 condition as a criterion, searching thermal stability limit points of the cross section in a multi-dimensional space; building the multi-dimensional space cross section thermal stability limit boundary according to all the searched thermal stability limit points. By means of the method, change conditions of thermal stability limit of the cross section along with sensitive factors can be reflected truly, the transmission capacity of the cross section is no longer a fixed value but is a complex boundary in the multi-dimensional space, and mode operation arrangement of a power system is flexible. Safety margin information of the current operation state of the system can be provided according to the distance between a current operation point and the boundary.

Description

Technical field [0001] The invention relates to a method for solving the thermal stability limit boundary of a power system section. In particular, it relates to a method for solving the thermal stability limit boundary of a multi-dimensional space section of a power system. Background technique [0002] Due to the uneven distribution of primary energy and economic development in my country, the load is far from the power center, and a large amount of electricity needs to be transmitted through the grid for long distances. With the rapid growth of electricity load, the transmission power of the regional discontinuity is increasingly approaching its transmission limit, threatening the safe and stable operation of the power grid. The thermal stability of the interruption line itself is one of the main factors limiting its transmission capacity. [1-3] . Since the power flow of the line is closely related to the system operation mode arrangement, the thermal stability limit of the s...

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Problems solved by technology

[0004] The traditional cross-section thermal stability limit research considering the "N-1" constraint is based on the cross-section thermal stability limit value calculated for a certain operating mode of the system. The results can only judge the safety and stability of the system in the current operating state, but cannot Have a holistic understanding of the safety and stability of the system and limit value results will not apply when the system arrangement is changed

In terms of engineering applications, the results of the section thermal stability limit analysis by the power dispatching department in the mode calculation are single and relatively conservative, which is not conducive to the flexible arrangement of the mode, and cannot meet the requirements of safe and refined operation of large power grids

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