An Online Transient Safety and Stability Evaluation Method Based on Automatic Screening of Anticipated Fault Sets

Abstract

The invention discloses an online transient safety stabilization evaluation method based on automatic expected fault set filtering and belongs to the electric power system safety stabilization analysis technology field. According to the method, a participation factor of a node active power for transient power angle stabilization is calculated based on a transient power angle stabilization participation factor of a generator and mutual impedance between a node and a generator inner node, weak node voltage sensitivity of a node reactive power for transient voltage safety stabilization is taken as a participation factor for transient voltage safety stabilization, a participation factor of the node active power for transient frequency safety is calculated based on mutual impedance between the node and a transient frequency safety weak node, a transient safety stabilization quantification evaluation result is estimated based on a previous transient safety stabilization quantification evaluation result and present node power injection change, an estimation parameter is corrected through a posteriori correction method according to the transient safety stabilization quantification evaluation result based on time domain simulation and difference of estimated values. The method is advantaged in that automatic expected fault set filtering of online transient safety stabilization evaluation can be realized.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability analysis, more precisely, the invention relates to an online transient safety and stability evaluation method suitable for automatic screening of expected fault sets in large power grids. Background technique [0002] With the continuous increase in the proportion of new energy power generation, the scale of the power grid and the volume of power transactions, as well as the continuous improvement of the requirements for energy conservation, environmental protection and economic operation, the operation mode of the power grid will become more complex and changeable, and there is an urgent need for research and development to support dispatching and operation control Technical means to ensure the safe and stable operation of large power grids. At present, the control centers above the provincial level of my country's power grid have realized online security and stability a...

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Problems solved by technology

However, the main improvements in this patent include two aspects. On the one hand, the influence of the injected power of other nodes except the synchronous generator on the transient power angle stability margin is not considered in the estimation of the transient power angle stability margin. In the estimation of transient voltage sag safety margin and transient voltage stability margin, the change degree of node power and node reactive voltage sensitivity is used to reflect the mechanism of its influence on transient voltage sag safety margin and transient voltage stability margin It is not clear enough. In the margin estimation of transient frequency offset acceptability (including frequency drop safety and frequency rise safety), the change degree of node injected power and grid active static frequency characteristic coefficient is used to reflect its influence on transient frequency offset. The mechanism of the acceptance margin is not clear enough; on the other hand, 12 estimation parameters are introduced, and all of them need to be manually set, so the degree of practicality needs to be improved

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