SYMMETRICAL STRUCTURE TRANSIENT LIMITER FOR SUPPRESSION OF CAPACITOR SWITCHING TRANSIENTS
DESIGN DETAILS
Capacitor switching transients, transient overvoltage, and inrush current are caused by the switching of shunt capacitor banks, which are used by industrial plants for power-factor correction. The compensating reactive power is usually controlled by the automatic power-factor regulator (APFR) to decide the amount of the switched capacitors. The capacitor banks are switched in and out quite frequently as the load varies. These switching transients will shorten the lifetime of the capacitor and damage the contacts of the switching device, such as those in a circuit breaker or an electromagnetic contactor (MC). Moreover, they may incur abnormal operation of the sensitive equipment and could also bring about problems with power quality (PQ).
This Matlab design is based on a symmetrical structure transient limiter (SSTL) fir reducing transient phenomena. The SSTL can automatically provide high impedance at the instant of capacitor energization, and, thus, the switching transients can be effectively suppressed. After the restriction, owing to the compensation of all power losses caused by the diodes and reactors, the SSTL acts as a short circuit during the steady state and, thus, has no effect in the circuit. As a result, the capacitor voltage and current waveforms will not be distorted. Moreover, due to the freewheeling effect in the SSTL, no transient overvoltage will appear across the switch contacts at the instant of capacitor de-energization even though the reactors are inserted into the circuit. The design tested using Matlab 2020a version.
REFERENCES
Reference Paper: Symmetrical Structure Transient Limiter for Suppression of Capacitor Switching Transients
Author’s Name: Shu-Ting Tseng, Jiann-Fuh Chen, and Tsorng-Juu (Peter) Liang,
Source: IEEE
Year: 2011
DOWNLOAD the Matlab code from the below URL, and specify the Website URL or Title of the design.
https://drive.google.com/file/d/1Cw6hZ8oEe_SO7OHAZE5H04kwZPOxHwpn/view?usp=sharing
SIMULATION VIDEO DEMO
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