Asymmetrical LVRT of DFIG incorporating feed‐forward transient current control and controllable resistive‐type fault current limiter

Abstract

During the low‐voltage ride‐through (LVRT) of the doubly fed induction generator (DFIG), the change rate of the stator flux is introduced as the feed‐forward compensation (FFC) to prevent the stator flux oscillation from affecting the rotor current control. The dual‐sequence FFC is proposed for the asymmetrical LVRT of the DFIG. To reduce the rotor voltage increase due to the FFC, the controllable resistive‐type fault current limiter (CRTFCL) is implemented at the stator side to improve damping to the stator flux oscillation. The resistance of the CRTFCL is controlled based on the ramp function to relieve oscillations resulted from the switch‐out of the CRTFCL. With the dual‐sequence FFC and CRTFCL applied to the asymmetrical LVRT, analytical expressions of the stator current, rotor current, and rotor voltage are derived. The accuracy of the analytical expressions and the improved LVRT performance with the dual‐sequence FFC and the CRTFCL are verified based on the time‐domain simulations. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Performance Enhancement of Doubly Fed Induction Generator–Based Wind Farms With STATCOM in Faulty HVDC Grids

“…Crowbar circuit (Noureldeen, 2012) Under a grid short circuit, the fault inrush current of the rotor is protected using a resistor and a closed-loop switch Crowbar integrated with SDR (Justo and Bansal, 2018) Parallel RL configuration crowbar with series RL circuit for LVRT Crowbar integrated with series RL circuit (Justo et al, 2014) Crowbar integrated with SDR + dc-link chopper (DCCC) (Haidar et al, 2017) Chopper and static-dynamic resistor (SDR) with series and parallel RL circuit to improve LVRT ANFIS-and fuzzy-based crowbar (Ismail and Bendary, 2016) Closed-loop control with intelligent controllers like ANFIS, and FIS in place of the conventional PI controller for a quicker and optimal operation Stator series CB based (Yang et al, 2010) SDR with circuit breaker with series RL circuit to overcome short circuit fault current Review of other protection schemes (Justo et al, 2015) Various protection control schemes for the DFIG are placed on the rotor side terminal Active and reactive power injecting devices STATCOM (Hannoon et al, 2021) Comparison to show the effectiveness of the system with and without the STATCOM controller for symmetrical and asymmetrical faults DVR (Chandravanshi and Gupta, 2021) A dynamic voltage restorer (DVR) is used to improve performance under balanced fault FCL (Baimel et al, 2021) Fault Current Limiter (FCL) is used to improve performance during the symmetrical and asymmetrical faults Super-capacitor (Kadri et al, 2020) A supercapacitor placed in parallel with a normal dc-link capacitor is used to improve performance under balanced fault Review on FRT solutions for improving transient stability in DFIG-WTs (Rini Ann Jerin et al, 2018) Various FRT control strategies for the DFIG under symmetrical and asymmetrical faults Control techniques, strategies, or methods Demagnetization current controller (Döşoğlu et al, 2018) LVRT with transient stability Scaled current tracking control (Huang et al, 2015) LVRT without flux observation Sensorless vector control method (Nair and Narayanan, 2020) Rotor position and speed observation using sliding mode observer for rapid control action Feed-forward transient current control (Huang and Li, 2020) (recent work) A state estimation technique to curtail rotor fault current at the time of fault and after fault is cleared Decoupled feed-forward voltage-oriented controller (Varma et al, 2015) Transient system control performance improvement Direct model predictive control (Abdelrahem and Kennel, 2017) FRT improvement with advanced model predictive control (MPC) Hybrid current control scheme (Mohseni et al, 2011) Low and high voltage...…”

“…The PI controller and tuning of it and the Bode plot-based analysis were discussed in the studies by Boubzizi et al (2018) and Hu et al (2020). Recent techniques have been developed to overcome balanced and unbalanced faults without allowing decomposition into positive and negative components, and the work was found to be more effective as discussed in Table 1 (Yang et al, 2010;Mohseni et al, 2011;Noureldeen, 2012;Xiao et al, 2012;Bounadja et al, 2014;Justo et al, 2014;Huang et al, 2015;Justo et al, 2015;Varma et al, 2015;Debouza et al, 2016;Ismail and Bendary, 2016;Abdelrahem and Kennel, 2017;Haidar et al, 2017;Justo et al, 2017;Debouza et al, 2018;Döşoğlu et al, 2018;Justo and Bansal, 2018;Rini Ann Jerin et al, 2018;Ali et al, 2019;Huang and Li, 2020;Kadri et al, 2020;Nair and Narayanan, 2020;Yang and Jin, 2020;Baimel et al, 2021;Benbouhenni and Bizon, 2021;Chandravanshi and Gupta, 2021;Hannoon et al, 2021;Kelkoul and Boumediene, 2021;Wadawa et al, 2022;Bhattacharyya and Singh, 2022;Wadawa et al, 2022;Conde D et al, 2022;Din et al, 2022;Ganthia et al, 2022;Gasmi et al, 2022;Hiremath...…”

A Common Capacitor Based Three Level STATCOM and Design of DFIG Converter for a Zero-Voltage Fault Ride-Through Capability

“…The reference paper [9] discusses the DFIG operation under unbalanced grid faults with modifications in the GSC control scheme. Similarly, scaled-current control [10], feed-forward and feed-backward scheme [11], feed-forward transient current control [12], Virtual Damping Flux [13], active disturbance rejection controller [14], and Coordinated fault ride-through (FRT) [15] are few contemporary methods to overcome the FRT. In these methods, internal current control or external power or speed control loops in the RSC are modified to compensate for the current or voltage and other DFIG parameters.…”

“…In [11], the application of dynamic voltage restorer as an external device and a new control strategy to enhance the DFIG operation during symmetrical and asymmetrical faults. How the DFIG must meet the modern grid rules is discussed in detail by Huang and Li [12]. A fundamental step to overcome the above effects is with the help of crowbar protection S. Liu et al [15] and Moursi and Zeineldin [16] that is placed on the rotor side of the DFIG.…”

“…The proposed paper also do not require crowbar protection in the rotor side of the DFIG, but it will make it more reliable under grid disturbances. Few reports used compensators like fault current limiters, Super-conducting magnetic energy storage etc., to limit surge currents and additional real and reactive power support [12], [20], [21], and [35]. These methods are expensive with sophisticated techniques.…”