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Real-time hardware emulation of WECS based on DFIG during unbalanced type-B and type-E voltage dips for enhanced low voltage ride-through

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Abstract

The presence of partially rated power electronic converters makes the doubly fed induction generator (DFIG)-based wind energy conversion systems (WECS) prominent. This paper focuses on an enhanced low voltage ride-through (LVRT) with reactive power support for WECS based on DFIG during unbalanced type-B and type-E grid voltage dips with the proposed negative sequence control technique. A variety of unbalanced voltage dips will happen in the power system due to different faults which are to be efficiently encountered as per the grid code requirements. WECS with DFIG can be regulated for different types of asymmetrical voltage dips for providing LVRT, by the proposed control of rotor-side-converter (RSC) and grid-side-converter (GSC). Simulations are carried out under MATLAB/Simulink environment for the performance analysis of 2 MW DFIG-based three blade wind turbine. Hardware emulation is executed under a real-time hardware-in-the-loop platform. The proposed control scheme for RSC and GSC shows an improved LVRT capability of WECS based on DFIG with reactive power support to the grid during unbalanced type-B and type-E voltage dips.

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Abbreviations

A :

Area of wind turbine blades in m2

β :

Pitch angle of blade

ρ :

Air density (1.225 kg/m3)

C p :

Power-coefficient

C pmax :

Crest value of power-coefficient

P w :

Power developed by the turbine

R :

Radius of wind turbine rotor

ω :

Speed of rotation in rad/sec

T ref :

Torque reference

V :

Speed of wind in m/sec

λ :

Tip-speed-ratio

λ opt :

Optimal tip-speed-ratio

p :

Pole pairs

L m :

Magnetizing inductance

i r and i s :

Currents in rotor and stator

v s and v r :

Voltage of stator and rotor

R r and R s :

Resistance of rotor and stator

φ r and φ s :

Stator and rotor flux referred to stator-side

L s and L r :

Self-inductance of stator and rotor

i drp and i qrp :

Positive sequence of dq rotor currents

i dgp and i qgp :

Positive sequence of dq grid currents

i drn and i qrn :

Negative sequence of dq rotor currents

i dgn and i qgn :

Negative sequence of dq grid currents

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Acknowledgements

Authors acknowledge the aid from the Centre for Engineering Research and Development (CERD), Kerala, India.

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Authors and Affiliations

  1. Department of Electrical Engineering, Rajiv Gandhi Institute of Technology, APJ Abdul Kalam Technological University, Kottayam, Kerala, India

    Tomson Thomas, A. Prince & P. R. Sunil Kumar

  2. Department of Electrical Engineering, National Institute of Technology, Calicut, Kerala, India

    Elizabeth P. Cheriyan

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Thomas, T., Prince, A., Kumar, P.R.S. et al. Real-time hardware emulation of WECS based on DFIG during unbalanced type-B and type-E voltage dips for enhanced low voltage ride-through. Electr Eng 104, 3717–3732 (2022). https://doi.org/10.1007/s00202-022-01577-6

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