A novel protection principle for turn to turn fault of valve side winding of series transformer of UPFC project

The aim of this paper is to achieve maximum voltage sag compensation of 52% using direct converter based DVR. The DVR topology has only two switches. The DVR is designed to compensate the voltage sag in a phase by taking power from the same phase. A direct converter is connected between the series transformer and the line in which sag compensation is to be achieved. If the actual amplitude of the error signal is used and the amplitude of carrier signal is kept at 1 unit, it is possible to achieve only 22% of sag compensation. If the amplitude of the carrier signal is modulated according to the percentage of existing sag, 52% of the sag is compensated through ordinary PWM technique with the THD less than 5%. Matlab Simulation results are presented for the validating the analysis.

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THD Reduction Using Series Transformer Connection In A STATCOM Within Mosul Ring System

AL-Rafdain Engineering Journal (AREJ) ◽

10.33899/rengj.2009.43378 ◽

2009 ◽

Vol 17 (5) ◽

pp. 15-22

Author(s):

Yasser A. Mahmood ◽

Majed S. Al-Hafid ◽

Dhaiya A. Al-Nimma

Keyword(s):

Ring System ◽

Series Transformer

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Common-source amplifier with shunt–series transformer feedback

High-Frequency Integrated Circuits ◽

10.1017/cbo9781139021128.021 ◽

2013 ◽

pp. 866-867

Author(s):

Sorin Voinigescu

Keyword(s):

Common Source ◽

Transformer Feedback ◽

Series Transformer ◽

Shunt Series

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Electromagnetic characteristic analysis of the series transformer in UPFC system

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-160064 ◽

2017 ◽

Vol 53 (3) ◽

pp. 469-485

Author(s):

Shuaibing Wang ◽

Lin Li ◽

Yuqing Xie ◽

Guoliang Zhao

Keyword(s):

Characteristic Analysis ◽

Electromagnetic Characteristic ◽

Series Transformer

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Series transformer based diode-bridge-type solid state fault current limiter

Frontiers of Information Technology & Electronic Engineering ◽

10.1631/fitee.1400428 ◽

2015 ◽

Vol 16 (9) ◽

pp. 769-784 ◽

Cited By ~ 13

Author(s):

Amir Heidary ◽

Hamid Radmanesh ◽

Seyed Hamid Fathi ◽

G. B. Gharehpetian

Keyword(s):

Solid State ◽

Fault Current ◽

Fault Current Limiter ◽

Bridge Type ◽

Current Limiter ◽

Series Transformer

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Direct Converter based DVR to Mitigate Single Phase Outage

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.c3888.098319 ◽

2019 ◽

Vol 8 (3) ◽

pp. 85-88

Keyword(s):

Single Phase ◽

The Other ◽

Voltage Sag ◽

Two Phase ◽

Dynamic Voltage Restorer ◽

Voltage Restorer ◽

Dynamic Voltage ◽

Simulation Results ◽

Series Transformer

The aim of this paper is to present a new simplified topology for a Dynamic Voltage Restorer (DVR) which has ability to mitigate single phase outage also. The proposed DVR has a multi-winding transformer, a direct converter and a series transformer for each phase. The multi winding transformer is connected between the direct converter and the grid. Only three bi-directional controlled switches are employed per phase. The direct converter is used to synthesis the required compensating voltage and the series transformer is used to add the compensating voltage in grid. The DVR can compensate balanced voltage sag, balanced swell, unbalanced swell and single phase outage by taking power from the grid. For compensating the voltage sag or outage in any one phase, the other two phase voltages are added using the multi winding transformer. The added voltage is pules-width modulated (PWM) using controlled switches to compensate the sag. Swell is compensated by taking power from the same phase. The simulation results confirm that the proposed topology can mitigate balanced sag of 50%, balanced swell of 100%, unbalanced swell of 100% and single phase outage.

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