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On the Low Risk of SSR in Type III Wind Turbines Operating in Grid-Forming Control

Conference ·
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We have shown in previous work that the risk of subsynchronous resonance (SSR) between wind power plant with Type III wind turbines and a series-compensated transmission line is low when the wind turbines are operated in gridforming mode, instead of the standard grid-following mode. This paper explains the fundamental mechanism behind the improved damping characteristics by modeling the positive- and negative-sequence impedances of Type III wind turbines in gridforming control mode. It is discovered that the grid-forming control naturally acts against the negative resistance behavior of Type III wind turbines at subsynchronous frequencies that results from an interaction between the rotor-side converter current controller and negative slip. The developed sequence impedance models and improved damping behavior are verified using PSCAD simulations of a 2.5-MW Type III grid-forming wind turbine. The modeling predictions are also supported by experimentally measuring the sequence impedance response of a 2.5-MW Type III wind turbine in grid-forming control mode.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1995468
Report Number(s):
NREL/CP-5D00-87177; MainId:87952; UUID:709ca2a8-795b-4608-8d72-b3576a096f7d; MainAdminID:70226
Country of Publication:
United States
Language:
English

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Related Subjects

POWER TRANSMISSION AND DISTRIBUTION
WIND ENERGY
damping
electric current control
power convertors
power generation control
power grids
subsynchronous resonance
wind power plants
wind turbines