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Title: The Impact of Transformer Winding Connections of A Grid-Connected PV on Voltage Quality Improvement

Abstract

In this paper, the high-power PV plant is connected to the weak grid by means of a three-phase power transformer. The selection of transformer winding connection is critical especially when the PV inverter has a reactive power controller. In general, transformer winding connection can be arranged in star-star (with neutral earthed) or star-delta. The reactive power controller supports voltage regulation of the power system particularly under transient faults. Its control strategy is based on utilizing the grid currents to make a three-phase reactive unbalanced current with a small gain. The gain is determined by the system impedance. Simulation results exhibit that the control strategy works very well particularly under disturbance conditions when the transformer winding connection is star-star with both neutrals grounded. The power quality in terms of the voltage quality is improved.

Authors:
ORCiD logo [1];  [2];  [3]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Petra Christian University
  3. University of Denver
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), NREL Fulbright Scholar Research Program
OSTI Identifier:
1431042
Report Number(s):
NREL/JA-5D00-71236
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
International Journal of Renewable Energy Research
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 24 POWER TRANSMISSION AND DISTRIBUTION; solar energy; grid connected pv; reactive power; transformer winding; voltage quality

Citation Formats

Muljadi, Eduard, Tumbelaka, Hanny H., and Gao, Wenzhong. The Impact of Transformer Winding Connections of A Grid-Connected PV on Voltage Quality Improvement. United States: N. p., 2018. Web.
Muljadi, Eduard, Tumbelaka, Hanny H., & Gao, Wenzhong. The Impact of Transformer Winding Connections of A Grid-Connected PV on Voltage Quality Improvement. United States.
Muljadi, Eduard, Tumbelaka, Hanny H., and Gao, Wenzhong. Thu . "The Impact of Transformer Winding Connections of A Grid-Connected PV on Voltage Quality Improvement". United States.
@article{osti_1431042,
title = {The Impact of Transformer Winding Connections of A Grid-Connected PV on Voltage Quality Improvement},
author = {Muljadi, Eduard and Tumbelaka, Hanny H. and Gao, Wenzhong},
abstractNote = {In this paper, the high-power PV plant is connected to the weak grid by means of a three-phase power transformer. The selection of transformer winding connection is critical especially when the PV inverter has a reactive power controller. In general, transformer winding connection can be arranged in star-star (with neutral earthed) or star-delta. The reactive power controller supports voltage regulation of the power system particularly under transient faults. Its control strategy is based on utilizing the grid currents to make a three-phase reactive unbalanced current with a small gain. The gain is determined by the system impedance. Simulation results exhibit that the control strategy works very well particularly under disturbance conditions when the transformer winding connection is star-star with both neutrals grounded. The power quality in terms of the voltage quality is improved.},
doi = {},
journal = {International Journal of Renewable Energy Research},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {3}
}