Identification method of transient state stable key transmission cross-section of electric power system fault

Abstract

The invention provides an identification method of transient state power-angle stable key transmission cross-section corresponding to an expected fault, belonging to the field of electric power system dispatching automation. Based on a transient state power-angle stable quantitative analysis theory and method, namely extended equal-area criterion (EEAC), the method identifies the key transmission cross-section corresponding to the expected fault to provide decision support for the electric power system dispatching operation and control. The method comprises the following steps: carrying out a time domain simulation in an expected fault scene based on the operation state, model and parameters of an electric fence; identifying a generator critical group with stable transient state power-angle by EEAC based on simulation track and calculating the participation factor of the generator; calculating the sensitivity to the cross-section components power change caused by the output of each generator in the generator critical group by a power flow sensitivity analysis method; and taking the sum of products of the participation factor in each generator of the generator critical group and corresponding sensitivity of the cross-section component as a judging indicator of the transient state stable key transmission cross-section corresponding to the fault.

Description

technical field [0001] The invention belongs to the field of power system scheduling automation, and determines a key transmission section identification method corresponding to a fault considering the transient stability of the power system according to the operating state of the power grid, a model and parameters, an expected fault scene, and a candidate set of transmission sections. Background technique [0002] The transmission section refers to a group of transmission components (lines, transformers) that are related to each other in terms of grid security and stability or power exchange. From the perspective of power transmission, the active power transmitted by each transmission element in the section should be in the same direction; from the perspective of power exchange, a set of transmission lines connecting two areas constitutes a transmission section for energy exchange. As the channel of power transmission and the corridor of electrical connection, the monitorin...

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Problems solved by technology

At present, the transmission section is often selected by the system dispatcher based on past operating experience, but with the gradual increase in the scale of the power grid, the operation situation becomes more and more complicated, and the dispatcher has to face such a problem: in the current operating state Or in the expected fault scenario, considering the transient stability of the system, if only a small number of transmission sections are monitored online for safety, it is impossible to fully reflect the operating status of the system and find problems and hidden dangers in the current operating state or the power grid under expected faults; If online security monitoring is performed on a large number of transmission sections, dispatchers may be at a loss for a large amount of information

Such methods do not take into account transient stability

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