Enhancement of Dynamic Modeling for LVRT Capability in DFIG-Based Wind Turbines
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RESEARCH PAPER
Enhancement of Dynamic Modeling for LVRT Capability in DFIG-Based Wind Turbines M. Kenan Do¨s¸og˘lu1 Received: 23 October 2018 / Accepted: 13 January 2020 Ó Shiraz University 2020
Abstract Low-voltage ride through (LVRT) is important for system compensation and reliable operation of the system during balance and unbalanced voltage dips. In this study, a new LVRT capability method was developed using active and passive compensator in doubly fed induction generator (DFIG)-based wind turbines. While the active compensator provides the control of the rotor-side converter and grid-side converters of DFIG, the passive compensator decreases the stator and rotor over currents and injects reactive power into the network to support the grid voltage DFIG. Besides, rotor electromotive force is developed to improve LVRT capability against not only symmetrical but also asymmetrical faults of DFIG. It was found that the system became stable in a short time and oscillations damped using active and passive compensator modeling. Keywords LVRT DFIG Active compensator Passive compensator
1 Introduction For the stable operation of power systems, the grid codes must be within certain standards during the grid connection of wind turbines. Wind turbines need to remain connected to grid and meet reactive power requirement during symmetrical and asymmetrical faults called LVRT capability. The DFIG is one of the most popularly used systems in wind power generation systems owing to its advantages such as active-reactive power control and reduced mechanical problems (Abad et al. 2011). There are improvement control methods in LVRT capability in DFIG. Feed-forward control model of rotor-side converter for LVRT capability in DFIG is enhanced. Besides, feedforward control is met through reactive power requirement of the system (Liang et al. 2010; Liang and Harley 2011). To provide voltage support during the grid voltage dip, the DC-link voltage control in grid-side converter of DFIG is implemented (Yang et al. 2012). Thanks to DC-link & M. Kenan Do¨s¸ og˘lu [email protected] 1
Faculty of Technology, Electrical Electronics Engineering Department, Duzce University, 81620 Konuralp, Duzce, Turkey
voltage control proposed for LVRT, oscillations in DFIG are reduced. Hysteresis-based current regulators for the inner current control loops are enhanced. This current regulator supports fast transient response of the system and LVRT capabilities of the DFIG (Mohseni and Islam 2012). To overcome the voltage dip problem, a new flux linkage model is enhanced depending on short-circuit rotor current for LVRT capability in DFIG. The new flux linkage controls the system against system distribution with control algorithm of rotor-side converter during voltage dip (Xiao et al. 2013). Enhanced for LVRT capability in DFIG, vector control can remove problems such as voltage dip, inrush current and unbalanced active-reactive power in symmetrical and unsymmetrical faults. Moreover, series grid-side converter overcomes these problems tha
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