Three-level Vienna Rectifier with a Brushless and Permanent Magnetless Generator for Wind Energy Conversion Systems
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1
Department of Electrical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India
2
Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Illinois, United States
Power Electronics and Drives 2022;7 (42):84-102
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ABSTRACT
This paper proposes a system design and control technique for a newly developed brushless and permanent magnetless synchronous
generator-based variable-speed wind energy generation system, transferring power to a constant voltage dc grid via a three-level
Vienna rectifier (VR). The recently established generator named Brushless Induction excited Synchronous Generator (BINSYG) is a
wound field synchronous generator (WFSG), whose excitation is developed by controlling an Induction Machine fitted to the same
machine structure and sharing the same magnetic core. A new controller is proposed that ensures the stable operation of BINSYG for a
wide variation of shaft speeds. VR achieves sinusoidal input current and can control the power factor at its input, which is particularly
suitable for wind energy applications. The top and bottom capacitor voltages of the VR are balanced using redundant switching
combinations. The system with its proposed control algorithm is modelled in MATLAB/Simulink for a 5 kW rated BINSYG feeding power
to a 750 V dc grid. The steady-state and dynamic state simulation results are presented and the controller performance is verified for
a wide range of wind speeds. Further, real-time results using the OPAL-RT testbed are presented for the same system to verify the
effectiveness of the overall control strategy.