A New Switching Control Approach to Reduce Capacitor Bank Inrush Current
Arrizal Haris F. (a), Aripriharta (a,b*), Irham Fadlika (a,b), A.N. Afandi (a,b) and Andrianto (a)

a) Department of Engineering, Universitas Negeri Malang
Jalan Semarang 5, Malang 65145, Indonesia
b) Centre of Advanced Materials for Renewable Energy
*aripriharta.ft[at]um.ac.id

Abstract

This paper presents the results analysis of switchings effect when capacitor bank operation against the amount of inrush current on the circuit breaker. Switching of capacitor bank causes inrush current and high frequency oscillation if there are two or more capacitor banks connected in the same bus. When it occurs repeatedly, the insulation from the electric equipment will weaken and breakdown. For this reason, we propose a method to reduce the inrush current using new controlled switching. Switching control is used to find time (t) of circuit breakers switching in each phase so that it can be seen configuration of capacitor banks switching that cause minimal inrush current. We have done a case study, there were 3 capacitor bank with capacity of 25 MVAR, 25 MVAR and 50 MVAR using simulink. Variables used include inrush current (ii), inrush current frequency (fi), controlled switching time (t) and damping reactor (Lreactor). The results of trial calculation on back to back of 3 capacitors cause inrush current is 202,1 kA and inrush current frequency is 85667,5 Hz. After insertion damping reactor, inrush current value is known to be 481,2 A and 204 Hz. By using this switching control method, we know that inrush current occurs almost close to zero ampere so it does not cause oscillations in the system.

Keywords: Capacitor bank, Inrush Current, Circuit Breaker, Switching control

Topic: Renewable Energy

Link: https://ifory.id/abstract-plain/XJCH8kxPMN6K

Web Format | Corresponding Author (Arrizal Haris Fajariawan)