An Analytical Method for Limiting Short-Circuit Current Using Line Out-of-Series Operation

Abstract

The invention relates to an analytical method of limiting short-circuit current by utilizing circuit serial operation. The analytical method of limiting the short-circuit current by utilizing circuit serial operation comprises the following steps: (1) an impedance matrix and node short-circuit current of a power grid in a initialization operation mode are calculated; (2) an equivalent circuit corresponding to the circuit serial operation is constructed, and node impedance variable quantities in different circuit serial operations are rapidly calculated; and (3) a serial operation mode when impedance variation is the largest is selected, and the corresponding short-circuit current is calculated. The technical scheme of the analytical method of limiting short-circuit current by utilizing circuit serial operation is applied to analytical calculation of the short-circuit current in an electrical power system and rapid analysis and decision of a limiting scheme of the short-circuit current. The different circuit serial operation modes in the actual operation of the power grid are different in limiting effects on the short-circuit current, the short-circuit current is effectively limited by selecting an appropriate circuit serial operation mode, assistance is provided for the operation mode of the power grid, and the short-circuit current of the power grid is guaranteed not to be out of limits.

Description

technical field [0001] The invention belongs to the field of analysis and calculation of electric power systems, and in particular relates to an analysis method for limiting short-circuit current by using line out-of-series operation. Background technique [0002] The purpose of short-circuit current analysis and calculation is to evaluate the short-circuit level of the power grid, check the power grid structure as a whole, provide a basis for the selection of the breaking capacity of the circuit breaker, and provide a decision-making basis for the setting of the relay protection. With the continuous expansion of the power system scale, the power supply continues to be put into operation, the connection between the power grid is getting closer, the short-circuit current of the power grid is further increasing, especially the short-circuit current level of the 500kV power grid is constantly rising, and many large domestic power grids have successively experienced the problem o...

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Problems solved by technology

This method is computationally intensive and time-consuming, which affects online applications

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