A screening method for critical units of thermal stability and safety in power system

Abstract

The invention discloses a screening method of a thermal stability and safety critical unit of a power system, which comprises the following steps: (1) obtaining an active output upper limit, an activeoutput lower limit of a system node of a designated power system and a line impedance value between the system nodes; (2) selecting any number of lines in the system as the system cross-section, andcalculate the sensitivity of all system nodes to these lines; (3) the sensitivity values of each node (n in total) to m lines in the system are treated as one sample point respectively. The mean algorithm clusters the n sample points. (4) the centroid of each cluster is selected as the key unit of this class. On the basis of the existing calculation of the active thermal stability sensitivity, Byusing the idea of clustering, the problem of selecting key units corresponding to key sections in thermal stability problems of power system is solved, which provides a feasible preliminary preparation scheme for the construction of thermal stability security region and thermal stability security control of power system, and provides a powerful reference for subsequent dispatchers to carry out security control.

Description

technical field [0001] The invention relates to a screening method for critical units of thermal stability and safety of a power system, in particular to a screening method for critical units of thermal stability and safety of a power system based on a k-means clustering algorithm. Background technique [0002] The rapid economic development makes the load level of the power system increase rapidly, and more and more lines or transformers are running close to the limit of thermal stability. Due to the characteristics of the grid structure and the arrangement of the operation mode during the transition period of the rapid development of the power grid, thermal stability constraints have become the key constraints for the safe operation of the power grid. Sensitivity-based active power safety control methods have been widely used in power system safety control and scheduling. However, when thermal stability safety problems occur in a system section composed of multiple lines, ...

AI Technical Summary

Problems solved by technology

Sensitivity-based active power safety control methods have been widely used in power system safety control and scheduling. However, when thermal stability safety problems occur in a system section composed of multiple lines, how to quickly and scientifically select appropriate units for active power generation? Power regulation has always been a prominent problem in actual operation

In the traditional line thermal stability scheduling control scheme, the method of combining sensitivity sorting with the actual experience of operators is a relatively common idea, but when there are many heavy-duty lines involved in the section and the number of units with high sensitivity is large, Solutions that rely too much on the experience of operators often cause greater losses to the economic benefits of system operation on the premise of ensuring system safety

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