A method for calculating short-circuit current of a power network with a high-temperature superconducting current limiter,

Abstract

The invention discloses a method for calculating short-circuit current of a power network with a high-temperature superconducting current limiter, comprising the steps of establishing a short-circuitcurrent calculation method with a high-temperature superconducting current limiter and a high-temperature superconducting current limiter; Short-circuit current calculation model of FCL; inputting grid data and fault information into the model; simplifying the original network; constructing the admittance matrix of the simplified network; triangulating the admittance matrix; solving the voltage vector by the forward-backward substitution method; recalculating the impedance of the nonlinear branch according to the voltage vector, and updating the admittance matrix; calculating the sum of the currents of adjacent branches of the fault node, and further calculating the current deviation; judging whether the current deviation is less than a preset threshold value, and if so, completing the calculation; injecting the three-sequence currents of the fault node and the bus at both ends of the current limiter into the linear network, and solving the other bus voltages and branch currents. The technical proposal provided by the invention has the advantages of simple calculation, accurate result, strong practicability and the like, and can provide the basis for the safety and stability analysis of the electric network containing the high-temperature superconducting current limiter, the relay protection setting calculation and the like.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of grid short-circuit current calculation, and in particular to a grid short-circuit current calculation method including a high-temperature superconducting current limiter. Background technique [0002] With the rapid development of social economy, the power load of power grids in many regions of the country continues to grow, the installed capacity continues to increase, and the construction of power grids has been further strengthened and improved. While the strong network structure meets the continuous growth of grid load, it also causes the problem of high short-circuit current level of the grid. The short-circuit current level of some substations has approached the breaking capacity of circuit breakers. The problem of short-circuit current has become a problem that restricts the safe and stable operation of the grid. and a salient factor for planning development. In recent ye...

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Problems solved by technology

At present, the research on HTS-FCL at home and abroad mainly focuses on the characteristic parameters, prototype development and optimal configuration, etc., and there is no research on the calculation method of short-circuit current including HTS-FCL

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