Design and manufacture of solid state voltage regulator for automatic voltage drop compensation

Document Type : Original Article

Authors

1 Assistant Professor, Department of Electrical Engineering, Technical and Vocational University (TVU), Tehran, Iran.

2 PhD Graduate, Department of Electrical Engineering, Faculty of Engineering, Lorestan University, Khorramabad, Iran.

10.48301/kssa.2022.335171.2053

Abstract

Electricity distribution network delivers voltage 220V to single phase customers. In weak distribution system, the length of feeders is long so the end of feeders is faced with excessive voltage drop. Compensating for this voltage drop by constructing medium voltage power system and installing new distribution substations is not cost effective. Especially in rural areas where the prospect of development and increase in subscribers is unlikely. Therefore, other flexible and low-cost solutions should be considered. In this research, to compensate for voltage drop, a small group of home subscribers who have voltage drop due to their distance from the distribution substation, a semi-industrial model of solid-state voltage regulator is designed and manufactured. In this structure, dry autotransformers with nominal power of 15KVA will be used as single-phase (or three-phase). The low-voltage autotransformer taps are changed by the use of triac semiconductor switches with voltage closed-loop control. To show the efficiency of this method, a 500VA laboratory sample was made using 12 triacs with 40A rated current, from which successful results were obtained. The measurement results show that this equipment can limit the voltage changes to the range of 0.95 to 1.05 of the nominal value while also not affecting the quality of power. The semi-industrial version of this voltage regulator has been manufactured and successfully tested, in which appropriate protection functions are embedded for operational use in power systems.

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Karafan Quarterly Scientific Journal
Volume 20, Issue 1 - Serial Number 61
Technical & Engineering
June 2023

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History

  • Receive Date: 01 May 2022
  • Revise Date: 10 September 2022
  • Accept Date: 25 October 2022

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