Area power network fault positioning method based on optimal wave velocity

• Main Author: GUO NINGMING
• Format: Patent
• Language: English
• Published: 16.09.2015
• Subjects: GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ONOTHER TECHNOLOGY AREAS; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORKOPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FORIMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION,DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TESTING

The invention relates to a fault positioning method for power system automation, and especially relates to an area power network fault positioning method based on an optimal wave velocity. The method, based on a genetic algorithm and a signal spectrum analysis, carries out fault positioning by use of branch line refracted waves correlated with fault lines in a power network. The method comprises the following steps: (1), analyzing a power grid structure and carrying out data pairing; (2), constructing a target function, and generating variable constraining conditions; (3), carrying out the signal spectrum analysis on the branch line refracted waves, and determining frequency components of signals and a frequency correction coefficient scope; (4), solving an optimal solution of the target function by use of the genetic algorithm to obtain the optimal wave velocity; and (5), according to the optimal wave velocity, obtaining a fault point position and outputting a result. The method provided by the invention takes the influences of the frequency and the path of each branch line into full consideration, and compared to a conventional area power network fault positioning algorithm, obviously improves the precision.