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Title: Dynamic Droop–Based Inertial Control of a Doubly-Fed Induction Generator

Abstract

If a large disturbance occurs in a power grid, two auxiliary loops for the inertial control of a wind turbine generator have been used: droop loop and rate of change of frequency (ROCOF) loop. Because their gains are fixed, difficulties arise in determining them suitable for all grid and wind conditions. This paper proposes a dynamic droop-based inertial control scheme of a doubly-fed induction generator (DFIG). The scheme aims to improve the frequency nadir (FN) and ensure stable operation of a DFIG. To achieve the first goal, the scheme uses a droop loop, but it dynamically changes its gain based on the ROCOF to release a large amount of kinetic energy during the initial stage of a disturbance. To do this, a shaping function that relates the droop to the ROCOF is used. To achieve the second goal, different shaping functions, which depend on rotor speeds, are used to give a large contribution in high wind conditions and prevent over-deceleration in low wind conditions during inertial control. The performance of the proposed scheme was investigated under various wind conditions using an EMTP-RV simulator. The results indicate that the scheme improves the FN and ensures stable operation of a DFIG.

Authors:
; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1259624
Report Number(s):
NREL/JA-5D00-65517
Journal ID: ISSN 1949-3029
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Sustainable Energy
Additional Journal Information:
Journal Volume: 7; Journal Issue: 3; Journal ID: ISSN 1949-3029
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; 24 POWER TRANSMISSION AND DISTRIBUTION; wind generator; inertial control; dynamic droop; rate of change of frequency; frequency nadir

Citation Formats

Hwang, Min, Muljadi, Eduard, Park, Jung-Wook, Sorensen, Poul, and Kang, Yong Cheol. Dynamic Droop–Based Inertial Control of a Doubly-Fed Induction Generator. United States: N. p., 2016. Web. doi:10.1109/TSTE.2015.2508792.
Hwang, Min, Muljadi, Eduard, Park, Jung-Wook, Sorensen, Poul, & Kang, Yong Cheol. Dynamic Droop–Based Inertial Control of a Doubly-Fed Induction Generator. United States. doi:10.1109/TSTE.2015.2508792.
Hwang, Min, Muljadi, Eduard, Park, Jung-Wook, Sorensen, Poul, and Kang, Yong Cheol. Fri . "Dynamic Droop–Based Inertial Control of a Doubly-Fed Induction Generator". United States. doi:10.1109/TSTE.2015.2508792.
@article{osti_1259624,
title = {Dynamic Droop–Based Inertial Control of a Doubly-Fed Induction Generator},
author = {Hwang, Min and Muljadi, Eduard and Park, Jung-Wook and Sorensen, Poul and Kang, Yong Cheol},
abstractNote = {If a large disturbance occurs in a power grid, two auxiliary loops for the inertial control of a wind turbine generator have been used: droop loop and rate of change of frequency (ROCOF) loop. Because their gains are fixed, difficulties arise in determining them suitable for all grid and wind conditions. This paper proposes a dynamic droop-based inertial control scheme of a doubly-fed induction generator (DFIG). The scheme aims to improve the frequency nadir (FN) and ensure stable operation of a DFIG. To achieve the first goal, the scheme uses a droop loop, but it dynamically changes its gain based on the ROCOF to release a large amount of kinetic energy during the initial stage of a disturbance. To do this, a shaping function that relates the droop to the ROCOF is used. To achieve the second goal, different shaping functions, which depend on rotor speeds, are used to give a large contribution in high wind conditions and prevent over-deceleration in low wind conditions during inertial control. The performance of the proposed scheme was investigated under various wind conditions using an EMTP-RV simulator. The results indicate that the scheme improves the FN and ensures stable operation of a DFIG.},
doi = {10.1109/TSTE.2015.2508792},
journal = {IEEE Transactions on Sustainable Energy},
issn = {1949-3029},
number = 3,
volume = 7,
place = {United States},
year = {2016},
month = {7}
}