Method for formulating transient stability emergency control generator tripping scheme for interconnected network

Abstract

The invention provides a method for formulating a transient stability emergency control generator tripping scheme for an interconnected network. The method comprises the steps of carrying out time-domain simulation on a network fault for which a generator tripping scheme needs to be formulated, extracting phase trajectory information of critical unit pairs and judging whether power angle instability of a system appears or not when an accident occurs; if the power angle instability does not appear, not carrying out generator tripping; and if the power angle instability appears, identifying critical units according to angular velocity information, carrying out stand-alone equivalent calculation on a critical cluster, calculating a generator tripping value, sorting the critical units according to the rotating speed at the generator tripping moment and selecting a generator tripping object according to the sorting result. According to the setting method, an instability fault can be judgedonly through extracting the phase trajectory information of the critical unit pairs, and the generator tripping value can be obtained only through carrying out stand-alone equivalent calculation on the critical cluster and collecting the angle of a power-angle curve of a stand-alone equivalent system of the critical cluster at the generator tripping moment, the angle and angular velocity at the moment of passing through an unstable equilibrium point, and the angle and power information of 10 sampling moments after passing through the unstable equilibrium point, so that the method provided by the invention is simple in scheme formulating process and high in efficiency in comparison with a traditional method.

Description

technical field [0001] The invention relates to the technical field of electric power system control, in particular to a method for formulating an emergency control cut-off scheme for transient stability of an interconnected power grid. Background technique [0002] Due to the large span of the interconnected grid area and the limitation of the transmission conditions of the communication system, it is very difficult to complete the fault information collection, analysis, processing, decision-making, and execution within a very short time after the fault, and it is difficult to balance the accuracy and speed of decision-making at the same time. Therefore, the method based on "offline decision-making, online matching" is still the most commonly used method for emergency control. [0003] Among the many control measures of power system emergency control, machine cut control measures can quickly change the inertia and kinetic energy of the system and reconfigure power distribut...

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Problems solved by technology

[0004] The invention provides a method for formulating a cut-off plan for transient stability emergency control of an interconne

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