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

Eduard Muljadi, Hanny Tumbelaka, Wenzhong Gao

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations

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.
Original languageAmerican English
Pages (from-to)7-14
Number of pages8
JournalInternational Journal of Renewable Energy Research
Volume8
Issue number1
StatePublished - 2018

NREL Publication Number

  • NREL/JA-5D00-71236

Keywords

  • grid connected pv
  • reactive power
  • solar energy
  • transformer winding
  • voltage quality

Fingerprint

Dive into the research topics of 'The Impact of Transformer Winding Connections of A Grid-Connected PV on Voltage Quality Improvement'. Together they form a unique fingerprint.

Cite this