The Impact of Transformer Winding Connections of A Grid-Connected PV on Voltage Quality Improvement
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Petra Christian University
- University of Denver
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.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), NREL Fulbright Scholar Research Program
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1431042
- Report Number(s):
- NREL/JA-5D00-71236
- Journal Information:
- International Journal of Renewable Energy Research, Journal Name: International Journal of Renewable Energy Research Journal Issue: 1 Vol. 8
- Country of Publication:
- United States
- Language:
- English
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