Method of optimal configuration of superconducting fault current limiter based on sensitivity technology

Abstract

The invention discloses a method of optimal configuration of a plurality of superconducting fault current limiter based on a sensitivity technology, which comprises the steps of: calculating the three-phase short-circuit current of all nodes in a whole system, and finding b nodes with the short-circuit current exceeding the standard value; determining braches for installation and reliable startup of the SFCLs (superconducting fault current limiter) according to startup conditions of the SFCLs; calculating the sensitivity of self-impedance of each station with the short-circuit current exceeding the standard value, sequencing the stations in a sensitivity descending order, and taking the top a branches as candidate braches for installation of the SFCLs; and taking c candidate braches as optimal branches for a multi-objective optimization algorithm NSGA-II (non-dominated sorting genetic algorithm-II) in next step, determining a scheme with the optimal installation positions of the SFCLs, the number of SFCLs to be installed and the impedance, thereby realizing global optimum configuration. By adopting the method, the search space to be understood is reduced greatly, the speed of calculation is increased, and optimization results are more suitable for actual applications. Meanwhile, the problem of weight selection resulting from conversion of multi-objective optimization to single-objective optimization can be avoided, and a decision-maker can make final decisions according to actual engineering needs.

Description

technical field [0001] The invention belongs to the field of power system operation and planning, in particular to a method for optimal configuration of a superconducting fault current limiter (SFCL) based on sensitivity technology. Background technique [0002] With the continuous expansion of the scale of the power system, the implementation of the interconnection between major power grids and the access of a large number of distributed power sources, the short-circuit current level of the system continues to rise, and in some cases even exceeds the rated breaking capacity of the circuit breaker, seriously threatening the safe operation of the grid. [0003] At present, in response to the problem of excessive short-circuit current in the power grid, various current-limiting measures have been proposed, which are mainly divided into two categories. One is to adjust the structure of the power grid and change the operating mode of the system. problem, but the construction pe...

AI Technical Summary

Problems solved by technology

This is a large-scale discontinuous and nonlinear multi-objective optimization problem. Most of the existing research results are to convert multi-objective optimization into single-objective optimization. However, the selection of weights affects the final optimization result, which belongs to the "first decision , post-search” optimization mode, some studies use the enumeration method to optimize the fault current limiter, but for large power grids, the calculation amount is too large to be applicable, and some studies do not consider the fault limiter in the optimization process. The starting conditions of the current limiter, that is, as long as the system fails, the fault current limiter at any position can be started reliably, which is not in line with practical engineering applications

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