Optimal configuration method of superconduction fault current limiter in active power distribution network

Abstract

The invention proposes an optimal configuration method of a superconduction fault current limiter in an active power distribution network. The optimal configuration method comprises the steps of acquiring a parameter of a power distribution network system and an access position and capacity of a distributed power supply, calculating steady-state power flow to obtain a voltage and a phase angle ofeach node in a steady state, and calculating a current of each branch in the steady state; considering a short-circuit current calculation method after access of the distributed power supply, calculating a short-circuit current of each node, finding out a node of which the short-circuit current exceeds standard, and calculating the current of each branch under a short-circuit state; selecting a branch capable of normally starting according to a starting condition of the superconduction fault current limiter, and sieving a candidate branch according to a branch sensitivity sequencing method; considering cost and current limitation effect of the fault current limiter, and performing multi-target optimal calculation on an installation position and installation impedance of the superconductionfault current limiter by improved multi-target particle swarm optimization; and obtaining a Pareto solution under different installation numbers for site selection and sizing in the power distribution network. By the optimal configuration method, the probability that local optimum of the algorithm is sunken is reduced, and the result accuracy is improved.

Description

technical field [0001] The invention belongs to the field of electric power system and automation, and in particular relates to an optimal configuration method of a superconducting fault current limiter in an active distribution network. Background technique [0002] In recent years, the grid-connected operation of distributed energy such as wind energy and solar energy has changed the power supply pattern of a single power supply network, making the traditional power grid gradually transform into a microgrid and an active distribution network. The access of Distributed Generation (DG) not only improves the flexibility and reliability of the distribution network, but also changes the power flow distribution, node voltage, branch current, network loss and other characteristics of the distribution network, and its capacity increases It will affect the safe and stable operation of the distribution network. Especially when a short-circuit fault occurs in the system, the problem...

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Problems solved by technology

Especially when a short-circuit fault occurs in the system, the problem of excessive short-circuit current is prominent

[0003] At present, for the problem of excessive short-circuit current in the distribution network, there are a variety of current limiting measures, which are mainly divided into two types: adjusting the grid structure and installing current limiting devices. Structural layered and partitioned operation, etc., but there are constraints on the increase of voltage level, which is still restricted by factors such as technical and environmental conditions, as well as the scale of generators and power plants; the operation of busbars in separate rows is economical, but it will reduce the electrical connection of the system, and there are Disadvantages of reduced safety margin; grid structure layered and partitioned operating costs are too high

The traditional method of installing a current-limiting device is mainly realized by installing a current-limiting reactor (CLR), but CLR is a high-energy-consuming device, which increases system network loss, reduces system stability, and affects the power grid. Electromagnetic environment

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