Computing method of preventive control measure for short-circuit current in electric power system

Abstract

The invention relates to a computing method of a preventive control measure for short-circuit current in an electric power system, which is applicable to short-circuit current evaluation and preventive control computation in a given operation mode. The method can be divided into two classes according to different types of control measures: (1) preventive control based on device start or stoppage:on the premise that the start or stoppage of a designated device in a network does not affect the system safety stability, forming a preventive control measure space based on device start or stoppage, and computing the effect of the start or stoppage of each device on the sensitivity of the short-circuit current on the basis of the measure space, thereby giving out the preventive control suggests; (2) preventive control based on plant topology analysis: by analyzing the topological connecting relation among the devices, such as circuit breakers, knife switches and the like in a plant, acquiring the main connection mode of the plant, computing control measures for the bus split operation or circuit out-of-series operation, and checking the short-circuit current level after the connection mode is changed; and finally, carrying out safety stability check on the possible preventive control measures based on device start or stoppage and plant topology analysis, thereby obtaining the final feasible measure.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a method for calculating short-circuit current prevention and control measures. Background technique [0002] With the continuous expansion of the grid scale and the strengthening of the connection, the short-circuit current level of the system is getting higher and higher. Many regional power grids, especially those in developed areas, have approached or even exceeded the maximum breaking capacity of circuit breakers. Effective measures must be taken to solve them. In the past, when the power grid operator arranged the operation mode, the short-circuit current at each point was checked according to the calculation principle of the maximum short-circuit current, and when the short-circuit current was found to exceed the standard, a plan to limit the short-circuit current was proposed. However, due to the commissioning ...

AI Technical Summary

Problems solved by technology

However, due to the commissioning of new equipment, changes in voltage levels, etc., the short-circuit current of busbars and lines close to the limit may exceed the breaking capacity of the circuit breaker in actual operation. It is very necessary to ensure the safe and stable operation of the power grid and avoid major accidents

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