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Research On Optimal Configuration And Fault Location Algorithm Of Multi-point Traveling Wave Unit In Regional Power Grid

Posted on:2020-07-17Degree:MasterType:Thesis
Country:ChinaCandidate:Y X ChengFull Text:PDF
GTID:2392330623452240Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
With the construction of large power grid,the network topology is further expanded.The traditional fault location algorithm is restricted by the hardware development level and its own principle defects.It can not meet the fault location requirements of the regional power grid.At the same time,if many traveling wave location units are configured,the operation and maintenance cost of the power grid will be improved and the utilization rate of the location unit will be reduced.Based on the practical engineering requirement,the improved phase mode transformation matrix is proposed in this paper,and the appropriate modulus is selected as the input signal of the fault location algorithm.At the same time,a method for optimal configuration of traveling location unit in the regional power grid is established.Based on the traveling wave information recorded by the configurated location unit,a fault location algorithm based on multi-point traveling wave information of the regional power grid is constructed.The main work of this paper is as follows:1)For the traditional phase mode transformation matrix,it is impossible to be responsed all fault type problems by the single modulus.Based on the problem,the element features of the transformation matrix are summarized,the element constraint equations are established and the improved phase-mode transformation matrix is proposed.Under any fault type,the zero modulus and one modulus component for the improved matrix are equal to 0.At this time,only one modulus component is selected as the input signal of the fault location algorithm and the fault location algorithm is simplified.In order to improve the fault location accuracy,assuming that the fault type is known,the larger modulus componentis selected as the input signal of the fault location algorithm.2)Existing optimal configuration methods are computationally complex.Based on this probleman,an optimal configuration method of traveling wave locatiom unit in the regional power grid based on the virtual fault domain is proposed.First,the line measurability of power system power is analyzed,and the precondition constraint of locatiom unit configuration based on the virtual fault domain is proposed.Second,the shortest transmission path of the fault line is analyzed,and the constraint condition based on line length coverage is proposed.At the same time,the situations are considered such as the installed location unit and the device failure.Third,the optimal configuration model is builded.Finally,the 0-1 integer planning algorithm is used to solve the optimal configuration of the location unit.3)For the fault location algorithm of the regional power grid,the calculation process and network simplification are complex.Based on this probleman,a fault location algorithm based on the time difference method of the node fault domain is proposed.First,according to the shortest transmission path,the node fault domain is divided,and the pre-criteria of the fault location belonging to the fault domain of single node is proposed.Second,the fault traveling wave transmission path of the complex ring network is analyzed.Then,the expected value,the actual value,and the search matrix of fault branch centered on the node domain is constructed.Based on this,the category identification criteria of the fault branch are proposed.Further,the identification of the fault branch is realized based on the matrix search.Finally,for the different fault branch categories,the traveling wave fault location algorithms of the single/multi-end are combined to realize the accurate calculation of the fault location.The simulation model of regional power grid is builded by PSCAD.The proposed improved phase mode transformation matrix and fault location algorithm are simulated and verified.The simulation results show that the proposed improved matrix has better adaptability to fault location,and the fault location algorithm has higher positioning accuracy.
Keywords/Search Tags:regional power grid, improved phase mode transformation, virtual fault domain, optimal configuration, node fault domain, time difference method
PDF Full Text Request
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