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Proceedings ArticleDOI

Design and implementation of triac based on load tap changer with primary tappings for constant output voltage

01 Apr 2017-pp 106-109
TL;DR: Results shows that the voltage levels at the output side is kept within stipulated boundaries when applied the proposed system of Triac based on load tap changer, a prospective solution for the present and future power grid providing automatic voltage regulation.
Abstract: As the increase of distributed generation is expected to generate several inherent instabilities such as power imbalance or voltage deviation in power system. At the distribution level maintaining the bus voltage within the permissible limit is one of the major challenges for the distribution networks. The solution for voltage regulation close to output side usually requires manual and automatic tap changers (automatic assisted with motor) of transformer for constant output voltage and better voltage regulation which may result in high maintenance cost and uncontrolled output voltage level as mechanical switches are used. The traditional mechanical tap changing systems accompanies with undesirable characteristics like high maintenance cost and arcing, wear and tear of contacts resulting in inappropriate stability of system. In this paper implementation of TRIAC based on load tap changer topology is introduced. It is a prospective solution for the present and future power grid providing automatic voltage regulation. To overcome the drawback of the conventional tap changing system the implementation of power electronic assisted device (triac) is introduced. The proposed approach has primary tappings instead of secondary tappings to reduce switching losses and to get constant output voltages with faster switching response under several variations in voltage on the primary side. Triac based OLTC is having key advantages like arc quenching, faster response, no friction losses, improved life of contacts and significantly constant output voltage. The results shows that the voltage levels at the output side is kept within stipulated boundaries when applied the proposed system of Triac based on load tap changer.
Citations
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Journal ArticleDOI
TL;DR: In this article , an algorithm based on internal game theory is incorporated into the ON-Load Tap-Changer of OLTC to improve the voltage regulation during peak demand and peak sun hours.

4 citations

Journal ArticleDOI
TL;DR: In this paper, a voltage regulation scheme to stabilize voltage variation in the consumer side is proposed, which uses IGBT-based onload tap changer (OLTC) and nonlinear hysteresis control algorithm.
Abstract: In this work, a voltage regulation scheme to stabilize voltage variation in the consumer side is proposed. The voltage regulation scheme uses IGBT-based onload tap changer (OLTC) and nonlinear hysteresis control algorithm. The proposed switching algorithm establishes the commutation of the taps without redundant short circuit operation of the taps. The experimental results of the designed system show accurate voltage regulation at the consumer side and high ability of the designed system to fix voltage sag and voltage swell in maximum of one cycle period. The paper considers the consequences of fault in the drive circuit of the IGBT tap changer and discusses its reliability. The analysis and the experimental results of the faults in the drive circuit show that the loss of one drive signal results in a large circulating DC current in the primary circuit and may result in fault current of value more than three times the operated current, which leads to unavailability of the system.

4 citations

Proceedings ArticleDOI
01 Nov 2019
TL;DR: A design and simulation of an Electronic OLTC using MATLAB/Simulink software have been proposed and results show a high sensitivity, minimum error and almost constant voltage at the load terminals.
Abstract: For the accelerated development of power distribution networks and the challenges in controlling the voltage fluctuation at the end load, multiple techniques have been implemented in literature; the most common technique is the On-load-tap-changer (OLTC). The OLTC regulates the voltage at the transformer output using mechanical switches. Recently, a new electronic OLTC has been introduced to overcome the drawbacks of normal OLTC using electronic switches. In this paper, a design and simulation of an Electronic OLTC using MATLAB/Simulink software have been proposed. The electronic OLTC is designed as per the transformer existing winding arrangement. The electronic OLTC model is tested to adjust the transformer secondary effective voltage using a PI controller. The simulation results show a high sensitivity, minimum error and almost constant voltage at the load terminals.

4 citations


Cites methods from "Design and implementation of triac ..."

  • ...b) Fully electronic OLTC: electronic switches are used alone in the commutation process [6-14]....

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References
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Proceedings ArticleDOI
15 Mar 2015
TL;DR: In this paper, a hybrid power transformer on-load tap changer (Hybrid-OLTC) was proposed to enable arc-free commutation of current from a mechanical switch to a semiconductor.
Abstract: Traditional power transformer on-load tap changer (OLTC) works with mechanical switches have issues of electrical contact and mechanical part wearing, as well as speed limit. Full power electronics OLTC (Full-PE-OLTC) have been proposed to improve its performance, but the high cost of semiconductor components have been imposing a bottle neck for its practical application. The concept of hybrid power electronics tap-changer (Hybrid-OLTC) have been proposed for power transformer with relatively lower cost. However, problems remain to be solved to avoid arcing when commutating current from mechanical switch to semiconductor. This paper presents a new Hybrid-OLTC design to enable arc-free commutation of current. Practical design requirements on current and voltage stress level are also discussed with solution provided. Experimental result with 2 tap switches setup is provided to verify the theoretical result, as well as to provide reference data for full system design.

15 citations

Proceedings ArticleDOI
10 Nov 2011
TL;DR: In this article, a new converter topology was proposed to drive primary tapped transformers, which can maintain a load voltage for a much wider source voltage variation without major sacrifices in efficiency.
Abstract: On load, transformer primary tap changing is not common in high frequency converters. This paper investigates a new converter topology to drive primary tapped transformers. The ideas that have been introduced previously are simply implemented into existing converter topologies which have been modified to accommodate a primary tapped transformer. The effects of efficiency with variation of source voltage and duty cycle are studied. It is shown that this topology can maintain a load voltage for a much wider source voltage variation without major sacrifices in efficiency.

4 citations