Journal article
Dynamic Droop-Based Inertial Control of a Doubly-Fed Induction Generator
Jeonbuk National University1
National Renewable Energy Laboratory2
Yonsei University3
Department of Electrical Engineering, Technical University of Denmark4
Department of Wind Energy, Technical University of Denmark5
Integration & Planning, Department of Wind Energy, Technical University of Denmark6
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.
Language: | English |
---|---|
Publisher: | IEEE |
Year: | 2016 |
Pages: | 924-933 |
ISSN: | 19493037 and 19493029 |
Types: | Journal article |
DOI: | 10.1109/TSTE.2015.2508792 |
ORCIDs: | Sørensen, Poul Ejnar |
Asynchronous generators Doubly fed induction generator (DFIG) Doubly fed induction generators Dynamic droop ENERGY ENGINEERING, Electric fault currents Electric generators Electric power system control Electric power transmission networks FREQUENCY CONTROL Frequency nadirs GREEN Inertial controls Kinetic energy Kinetics Large disturbance Low wind conditions Rate of change of frequencies Renewable Energy, Sustainability and the Environment SDG 7 - Affordable and Clean Energy SYSTEMS Stable operation TURBINES Turbogenerators WIND POWER PENETRATION Wind turbines frequency nadir inertial control rate of change of frequency wind turbine generator