Abstract
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 grid-forming 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 grid-forming 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.
Original language | American English |
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Pages | 74-79 |
Number of pages | 6 |
DOIs | |
State | Published - 2022 |
Event | 21st Wind and Solar Integration Workshop, WIW 2022 - Hybrid, The Hague, Netherlands Duration: 12 Oct 2022 → 14 Oct 2022 |
Conference
Conference | 21st Wind and Solar Integration Workshop, WIW 2022 |
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Country/Territory | Netherlands |
City | Hybrid, The Hague |
Period | 12/10/22 → 14/10/22 |
Bibliographical note
See NREL/CP-5D00-83808 for preprintNREL Publication Number
- NREL/CP-5D00-87177
Keywords
- grid-following control
- grid-forming control
- impedance modeling
- stability
- Subsynchronous resonance