Fault-tolerant control of an open-winding brushless doubly-fed wind power generator system with dual three-level converter

Abstract

To improve the fault redundancy capability for the high reliability requirement of a brushless doubly-fed generation system applied to large offshore wind farms, the control winding of a brushless doubly-fed reluctance generator is designed as an open-winding structure. Consequently, the two ends of the control winding are connected via dual three-phase converters for the emerging open-winding structure. Therefore, a novel fault-tolerant control strategy based on the direct power control scheme is brought to focus in this paper. Based on the direct power control (DPC) strategy, the post-fault voltage vector selection method is explained in detail according to the fault types of the dual converters. The fault-tolerant control strategy proposed enables the open-winding brushless doubly-fed reluctance generator (BDFRG) system to operate normally in one, two, or three switches fault of the converter, simultaneously achieving power tracking control. The presented results verify the feasibility and validity of the scheme proposed.

Graphical abstract

Keywords

open-winding / brushless doubly-fed reluctance generator (BDFRG) / direct power control / fault-tolerant control / multi-level converter / wind power

References

[1] Chaal H, Jovanovic M. Toward a generic torque and reactive power controller for doubly fed machines. IEEE Transactions on Power Electronics, 2012, 27(1): 113–121

[2] Chaal H, Jovanovic M. Practical implementation of sensorless torque and reactive power control of doubly fed machines. IEEE Transactions on Industrial Electronics, 2012, 59(6): 2645–2653

[3] Cheng M, Zhu Y. The state of the art of wind energy conversion systems and technologies: a review. Energy Conversion and Management, 2014, 88: 332–347

[4] Attya A B, Ademi S, Jovanović M, Frequency support using doubly fed induction and reluctance wind turbine generators. International Journal of Electrical Power & Energy Systems, 2018, 101: 403–414

[5] Zhang A, Wang X, Jia W, Indirect stator-quantities control for the brushless doubly fed induction machine. IEEE Transactions on Power Electronics, 2014, 29(3): 1392–1401

[6] Prasad R, Mulla M. A novel position-sensorless algorithm for field-oriented control of DFIG with reduced current sensors. IEEE Transactions on Sustainable Energy, 2019, 10(3): 1098–1108

[7] Cheng M, Han P, Buja G, Emerging multiport electrical machines and systems: past developments, current challenges, and future prospects. IEEE Transactions on Industrial Electronics, 2018, 65(7): 5422–5435

[8] Choi U, Lee J, Blaabjerg F, Open-circuit fault diagnosis and fault-tolerant control for a grid-connected NPC inverter. IEEE Transactions on Power Electronics, 2016, 31(10): 7234–7247

[9] Yang S, Bryant A, Mawby P, An industry-based survey of reliability in power electronic converters. IEEE Transactions on Industry Applications, 2011, 47(3): 1441–1451

[10] Lu B, Sharma S. A literature review of IGBT fault diagnostic and protection methods for power inverters. IEEE Transactions on Industry Applications, 2009, 45(5): 1770–1777

[11] Kwak S. Fault-tolerant structure and modulation strategies with fault detection method for matrix converters. IEEE Transactions on Power Electronics, 2010, 25(5): 1201–1210

[12] Hoang K D, Zhu Z Q. Comparative performance study of alternate fault-tolerant inverter configurations for direct torque control-based three phase PM BLAC drives under single-phase open-circuit fault. In: 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016), Glasgow, UK, 2016

[13] Welchko B A, Lipo T A, Jahns T M, Fault tolerant three-phase AC motor drive topologies: a comparison of features, cost, and limitations. IEEE Transactions on Power Electronics, 2004, 19(4): 1108–1116

[14] Shahbazi M, Saadate S, Poure P, Open-circuit switch fault tolerant wind energy conversion system based on six/five-leg reconfigurable converter. Electric Power Systems Research, 2016, 137: 104–112

[15] Li X, Dusmez S, Akin B, A new active fault-tolerant SVPWM strategy for single-phase faults in three-phase multilevel converters. IEEE Transactions on Industrial Electronics, 2014, 62(6): 3955–3965

[16] Restrepo J, Berzoy A, Ginart A, Switching strategies for fault tolerant operation of single DC–link dual converters. IEEE Transactions on Power Electronics, 2012, 27(2): 509–518

[17] Wang Z, Chen J, Cheng M, Fault-tolerant control of paralleled-voltage-source-inverter-fed PMSM drives. IEEE Transactions on Industrial Electronics, 2015, 62(8): 4749–4760

[18] Chowdhury S, Wheeler P, Patel C, A multilevel converter with a floating bridge for open-end winding motor drive applications. IEEE Transactions on Industry Applications, 2016, 63(9): 5366–5375

[19] An Q, Liu J, Peng Z, Dual-space vector control of open-end winding permanent magnet synchronous motor drive fed by dual inverter. IEEE Transactions on Power Electronics, 2016, 31(12): 8329–8342

[20] Jin S, Shi L, Zhu L, Dual two-level converters based on direct power control for an open-winding brushless doubly-fed reluctance generator. IEEE Transactions on Industry Applications, 2017, 53(4): 3898–3906

[21] Chaal H, Jovanovic M. Power control of brushless doubly-fed reluctance drive and generator systems. Renewable Energy, 2012, 37(1): 419–425

[22] Zhao W, Wu B, Zhu Q. Fault-tolerant direct thrust force control for a dual inverter fed open-end winding linear vernier permanent-magnet motor using improved SVPWM. IEEE Transactions on Industrial Electronics, 2018, 65(9): 7458–7467

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51537007).

RIGHTS & PERMISSIONS

2020 Higher Education Press