Journal
IEEE TRANSACTIONS ON POWER SYSTEMS
Volume 36, Issue 5, Pages 4892-4895Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2021.3094367
Keywords
Impedance; Voltage control; Current control; Feedforward systems; Transfer functions; Gain; Time-domain analysis; Solar photovoltaic (PV) grid integration; ac overcurrent; proportional resonant control
Categories
Funding
- U.S. Department of Energy Solar Energy Technology Office [DE-EE-0008771, PESL-00034-2021]
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This study provides a quantitative analysis of ac overcurrent, with frequency-domain analysis and time-domain simulation results illustrating the impact of control parameters and grid strength on ac overcurrent.
On July 7 2020, approximately 1000 MW reduction in solar photovoltaic (PV) output was experienced by the bulk power system in Southern California after a three-phase fault. Disturbance analysis indicates that instantaneous AC current caused inverter tripping. The projection of the root cause of AC overcurrent from the NERC report is that inverter current control is not tight. This letter provides a quantitative analysis on ac overcurrent and addresses the following questions: (i) what type of current controls may lead to ac overcurrent and (ii) how controller parameters and grid strength may influence ac overcurrent. The letter provides frequency-domain analysis and time-domain simulation results of a grid-integrated inverter to illustrate the effect of control parameters and grid strength on ac overcurrent.
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