Fault location method of wide-area traveling wave signal in general power grid

Abstract

The invention discloses a fault location method for wide area traveling wave signal below power grid, with a little of fault traveling wave monitoring points for the power grid, the fault signal is processed on the phase-mode transformation and the small wave mode maximum value process to obtain the initial wave header information; the extension double-end travelling wave fault location is realized in the complex power grid, the fault location method of general power grid is offered on this basis for fast finding the exact double-end ranging combination from the measured data, and raising the ranging precision by amending the result. The monitoring data is processed and checked for realizing extension double-end travelling wave fault location for any fault point of the system, and the method has good fault-tolerant capability.

Description

technical field [0001] The invention relates to research on a fault location method adapted to wide-area traveling wave signals under a general power grid. Background technique [0002] With the continuous expansion of the spatial scope of modern power systems and the development of modern computer processing technology, digital signal processing technology, and GPS synchronous timing technology, wide-area information collection after complex power grid faults is becoming easier to achieve. The research on relay protection and status monitoring under the wide-area system is gradually increasing; in order to reduce the loss of fault accidents and achieve good economic and social benefits, it is necessary to monitor the safety status of the power grid and quickly locate faults, especially for Wide-area systems, there have been some mature research results at home and abroad. Because the traveling wave method is less affected by the change of system operating parameters, and c...

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Problems solved by technology

[0003] In the research on the distance measurement of traveling wave method under the wide area system, the algorithm is mainly aimed at the radial distribution network. If the system contains special structures such as ring network, the algorithm effect may not meet the ideal requirements; the adjacent point optimization strategy is adopted Find the shortest path, and then get the fault location through linear regression analysis; literature [5] In the case of expanding the concept of double-ended distance measurement, calculate the time to reach all monitoring points when each busbar fails. When the actual fault occurs, the minimum time to reach the detection device is used as the basis. Finally, the detection value and the theoretical value are standardized. Number calculation, select the bus corresponding to the smallest two norms, and then determine the faulty line, but this method is limited by the structural characteristics of the line, it can only meet 82.2% of the lines in the IEEE-14 system, and it cannot be quickly and automatically separated Faulty lines need to be analyzed manually; literature [3,4] Using the wide-area traveling wave information of the complex power grid to realize fault location, considering the configuration of TWR in the power grid, but not considering the fault tolerance of its algorithm

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