Improved Current Controlled Doubly Fed Induction Generator Model with Grid Integration Under Sub and Super Synchronous C
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ORIGINAL ARTICLE
Improved Current Controlled Doubly Fed Induction Generator Model with Grid Integration Under Sub and Super Synchronous Conditions Hamza Ahmad1,2 · Hassan Khalid3 · Arslan Ahmed Amin4 · Neha Masroor1,5 · Huda Mahmood1 · Muhammad Abubakar1 Received: 25 April 2020 / Revised: 19 June 2020 / Accepted: 5 October 2020 © The Korean Institute of Electrical Engineers 2020
Abstract This paper presents the development and experimental verification of the mathematical model of wind turbine and Doubly Fed Induction Generator (DFIG) using the current control and voltage estimation method between the DC link. The rotor of the induction generator (IG) is rotated with the wind turbine at a specific speed. The DFIG is directly coupled with a grid station and the synchronization between DFIG and the grid station is controlled by setting two converters: Machine Side Converter (MSC) implemented with the rotor side and Grid Side Converter (GSC) implemented with the grid. PI controllers have been utilized in the control loops and the parametric range is extracted to maximize the mechanical power transferred to the IG rotor. The model is tested under three conditions DFIG running at super synchronous speed, synchronous speed, and under synchronous speed using MATLAB Simulink. In the end, the same model is also tested through a series of experiments using lab modules. The results show that the proposed model is much simplified and accurate as compared to previous versions available in the literature. Keywords DFIG modelling · Induction generator · Wind turbine · Grid side converter · Machine side converter List of Symbols A Turbine swept area 𝛽 Blade Pitch angle
* Arslan Ahmed Amin [email protected] Hamza Ahmad [email protected] Hassan Khalid [email protected] 1
Department of Electrical Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, Pakistan
2
School of Electrical and Electronics Engineering, Chung-Ang University, Seoul, South Korea
3
Department of Electrical Engineering, NFC Institute of Engineering and Technology, Multan 59060, Punjab, Pakistan
4
Department of Electrical Engineering, FAST National University of Computer and Emerging Sciences, Chiniot Faisalabad Campus, Lahore 35400, Punjab, Pakistan
5
Department of Energy Systems Engineering, UPCASE, National University of Science and Technology (NUST), Islamabad, Pakistan
ψr Rotor side flux ψs Stator side Flux CP Performance factor Cp Power coefficient DFIG Doubly fed induction generator DSL Dynamic simulation language Ewind Wind energy GSC Grid Side converter H Motor inertia IG Induction generator is Stator current ir Rotor current Iabc Three phase line current Lm Mutual inductance Lr Rotor side inductance Ls Stator side inductance 𝜆 Tip speed ratio Pg Grid active power P Number of poles Pm Mechanical power Qg Grid reactive power Rr Rotor resistance Rs Stator resistance Te Induced torque
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Tm Mechanical torque VDC DC voltage
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