Development of a Smart Static Transfer Switch Based on a Triac Semiconductor for AC Power Switching Control

Ahmed H. Okilly, Namhun Kim, Jonghyuk Lee, Yegu Kang and Jeihoon Baek ()
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Ahmed H. Okilly: Electrical & Electronics and Communication Engineering Department, Koreatech University, Cheonan 31253, Republic of Korea
Namhun Kim: Department of Electrical & Electronics, Korea Polytechnic, Gumi 39257, Republic of Korea
Jonghyuk Lee: Electrical & Electronics and Communication Engineering Department, Koreatech University, Cheonan 31253, Republic of Korea
Yegu Kang: Electrical & Electronics and Communication Engineering Department, Koreatech University, Cheonan 31253, Republic of Korea
Jeihoon Baek: Electrical & Electronics and Communication Engineering Department, Koreatech University, Cheonan 31253, Republic of Korea

Energies, 2023, vol. 16, issue 1, 1-16

Abstract: Power system disruptions can be categorized as issues with the quality of electricity brought on by voltage sags, lightning strikes, and other system-related interferences. The static transfer switch (STS) has recently emerged as the most important technology for electric power transmission, distribution, and control systems to manage power supply during power system disruption issues, particularly in cost-effectively supplying power to critical loads and sensitive loads without interruption. In this paper, for the switching between the two AC sources during the voltage disruptions issue with low transfer time, a smart static transfer switch (SSTS) based on a digital switching algorithm and Triac semiconductor switch is proposed and experimentally tested. A digital switching algorithm based on online AC voltage sensing and zero-crossing detection is proposed and implemented inside a DSP MCU. The printed circuit board (PCB) of the proposed SSTS is designed and manufactured for the experimental performance investigation with different AC input voltage conditions. A comparative study based on the advantages and disadvantages of the proposed SSTS system with the previous works is also presented. A smart static transfer switch with a transition time of less than one cycle and a digital protection technique during fault conditions is obtained in this work.

Keywords: AC power control; smart static transfer switch (SSTS); switching algorithm; zero-crossing detection; transfer time; online AC voltage measurements; Triac (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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