Low voltage ride-through enhancement of DFIG-based wind turbine using DC link switchable resistive type fault current limiter |
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| Affiliation: | 1. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;2. School of Engineering and ICT, University of Tasmania, Hobart, TAS, Australia;3. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51666-15813, Iran;4. School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, NSW 2522, Australia;1. Electrical Power and Machines Department, Faculty of Engineering, Ain Shams University, Cairo 11517, Egypt;2. Department of Electrical Engineering, Police Academy, Cairo, Egypt;1. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;2. School of Engineering and ICT, University of Tasmania, Hobart, TAS 7000, Australia;3. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51666-15813, Iran;4. Engineering Faculty, Near East University, 99138 Nicosia, North Cyprus, Mersin 10, Turkey;1. School of Engineering and ICT, University of Tasmania, Hobart, TAS 7001, Australia;2. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran;3. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51666-15813, Iran |
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| Abstract: | Doubly-fed induction generator (DFIG)-based wind turbines utilise small-scale voltage sourced converters with a limited overcurrent withstand capability, which makes the DFIG-based wind turbines very vulnerable to grid faults. Often, modern DFIG systems employ a crowbar protection at the rotor circuit to protect the rotor side converter (RSC) during grid faults. This method converts the DFIG to a squirrel cage induction generator, which does not comply with the new grid codes. The recent grid codes need wind turbines to stay connected to the utility grid during and after power system faults, especially in high penetration level of wind power. Furthermore, the crowbar switch is expensive. This paper proposes a novel DC-link switchable resistive-type fault current limiter (SRFCL) to improve the LVRT capability of the DFIG. The proposed SRFCL is employed in the DC side of the RSC. The SRFCL solves crowbar protection activation problems and eliminates subsequent complications in the DFIG system. The proposed SRFCL does not have any significant impact on the overall performance of the DFIG during normal operation. Whenever the fault, whether symmetrical or asymmetrical, occurs, the SRFCL not only limits rotor over-currents but also prevents rotor speed acceleration and restricts high torque oscillations even during zero grid voltage, as recommended by some grid codes. To prove the effective operation of the SRFCL on the RSC fault current limitation, analytical analysis is performed in each switching interval. The proposed approach is compared with the crowbar-based protection method. Simulation studies are carried out in PSCAD/EMTDC software. In addition, a prototype is provided to demonstrate the main concept of the proposed approach. |
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| Keywords: | Doubly-fed induction generator Low voltage ride-through Grid faults DC link Switchable resistive type fault current limiter |
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