A Calculation Method of Transient Stability Limit of Transmission Section in Power System

Abstract

The invention provides a computing method for a transient stability limit of a transmission section of a power system. The method comprises the following steps of: S1, dividing a power grid into a power transmitting region and a power receiving region, increasing the output of the power transmitting region, reducing the output of the power receiving region, and increasing the transmission power of the section; S2, obtaining a transient stability limit, a limit operation mode and a control fault according to a set output changing scheme; S3, recognizing an instable cluster and a stable cluster of the control fault in the limit mode; S4, generating a new output changing scheme, increasing the output of a machine set in the instable cluster or starting a machine set which is not started, and reducing the output of the machine set in the stable cluster until the machine set stops; S5, obtaining a transient stability limit, a limit operation mode and a control fault according to the new output changing scheme; and S6, ending if the control fault in the step S5 is same as that in the step S2 and taking the transient stability limit obtained in the step S5 as a result, or otherwise, executing the step S3 to regenerate an output changing scheme and search a transient stability limit. The computing method has the advantages of high accuracy and good stability.

Description

technical field [0001] The invention relates to the technical field of power system analysis, in particular to a calculation method for the transient stability limit of a power transmission section of a power system. Background technique [0002] Transient stability is an important content of power system safety and stability. The power grid operation department needs to ensure that the power grid can maintain transient stability under anticipated faults. In power grid operation, the transient stability of the system is generally guaranteed by controlling the power of the transmission section. The transmission section is a collection of some branches in the power grid. After these branches are disconnected, the power grid is divided into two disconnected areas. The power on the transmission section represents the power transmitted between the two areas. When the power transmitted on the transmission section is too large, the system may be transiently unstable under a certa...

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Problems solved by technology

When the alternation scheme of generator output is different, the obtained stability limit is likely to be different, which makes the calculation result of the stability limit depend on the pre-set artificially, and cannot guarantee the most serious situation (the generator output change method with the smallest stability limit ), the most conservative stability limit

This is detrimental to the security of the power grid

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