Abstract
In this study, genetic programming (GP) is used for optimizing bus and line separation methods to reduce the short-circuit current. Expanding power systems led to intensive electric power and more transmission lines, reducing the grid impedance. This increases the short-circuit currents that occur during failure, and it is impossible to continue developing higher-capacity breakers to accommodate such short-circuit currents. Therefore, the short-circuit currents must be managed systematically through busbar separation and line separation. However, there are countless possible bus and line separation schemes for power systems. Furthermore, to comply with power-system reliability standards, no lines or transformers should be overloaded after such controls are applied. This paper proposes the use of GP to optimize the bus and line separation methods for obtaining a solution. The solutions are limited to methods that can be implemented in real power systems, reducing the convergence probability and optimization time. The proposed technique is useful for designing power systems with consideration of the short-circuit current.
Highlights
The demand for electricity in South Korea is increasing rapidly owing to economic growth and improvement in living standards, and this is accompanied by a large increase in the power output
Where Tn represents the number of buses with short-circuit current exceeding breaker capac8 of 15 n represents the number of overloaded lines and transformers, R represents the number of busbar separation methods, and S represents the number of line separation methods
A genetic programming (GP)-based optimization method is proposed for systematically selecting the optimal method to reduce the short-circuit current in a power system by organizing the busbar separation method and the line separation method, which are the traditional methods for reducing the short-circuit current
Summary
The demand for electricity in South Korea is increasing rapidly owing to economic growth and improvement in living standards, and this is accompanied by a large increase in the power output. The method of installing a current-limiting reactor is widely used because of its relatively low cost and short construction period, it has an operational disadvantage in that the current-limiting reactor can be inserted and removed only by cutting off the transmission line, because impedance is input in series. It has the disadvantage of reducing the stability of the system, because the impedance increases. By using such a method, it is possible to accurately find the Energies 2022, 15, 678 optimal solution for reducing the short-circuit current, and to significantly reduce the calculation time
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