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

doi:10.1007/s11708-020-0711-2

Front. Energy

2023, Vol. 17

Issue (1) : 149-164 https://doi.org/10.1007/s11708-020-0711-2

RESEARCH ARTICLE

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

Shi JIN¹(

), Long SHI¹, Sul ADEMI², Yue ZHANG³, Fengge ZHANG¹

¹. School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
². Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, Warwick, UK
³. School of Electrical Engineering, Shandong University, Jinan 250061, China

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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.

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

Corresponding Author(s): Shi JIN

Online First Date: 10 December 2020 Issue Date: 29 March 2023

Cite this article:

Shi JIN,Long SHI,Sul ADEMI, et al. Fault-tolerant control of an open-winding brushless doubly-fed wind power generator system with dual three-level converter[J]. Front. Energy, 2023, 17(1): 149-164.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-020-0711-2
https://academic.hep.com.cn/fie/EN/Y2023/V17/I1/149

Fig.1 Structural diagram of OW-BDFRG connected to dual 3LC.

Fig.2 Output voltage vectors.

Fig.3 OW-BDFRG fault-tolerant control system proposed based on DPC.

Tab.1 Revised CW flux angle

Fig.4 Synthesized space voltage vector distribution of MSC1 and MSC2 as S_a₂ in short-circuit fault or S_a₄ in open-circuit fault.

Fig.5 Schematic overview of power deviation comparison module.

Tab.2 Switching voltage vector selection for short-circuited (S_a₂) or open-circuited (S_a₄)

Fig.6 Synthesized space voltage vector distribution of MSC1 and MSC2 as S_a₃ in short-circuit fault or S_a₁ in open-circuit fault.

Fig.7 Synthesized space voltage vector distribution of MSC1 and MSC2 as S_a₂ in open-circuit fault.

Tab.3 Switching voltage vector selection for open-circuited (S_a₂)

Fig.8 Synthesized space voltage vector distribution of MSC1 and MSC2 as S_a₃ in open-circuit fault.

Fig.9 Synthesized space voltage vector distribution of MSC1 and MSC2 as S_a₁ or S_a₄ in short-circuit fault.

Fig.10 Synthesized space voltage vector distribution of MSC1 and MSC2 at the fault of two switches.

Tab.4 Voltage vector selection for the fault of S_a₁ and S_b₃

Tab.5 Voltage vector selection for the fault of S_a₁ and S_d₃

Tab.6 Voltage vector selection for the fault of S_a₂ and S_b₄

Tab.7 Voltage vector selection for the fault of S_a₂ and S_d₄

Fig.11 Synthesized space voltage vector distribution of MSC1 and MSC2 at the fault of three switches.

Fig.12 Transitional response from healthy mode (sub-synchronous operation) to fault mode (S_a₂ open-circuit fault).

Fig.13 Transitional response from healthy mode (super-synchronous operation) to fault mode (S_a₂ open-circuit fault).

Fig.14 Changes of given parameters and settings.

Fig.15 System results for S_a₁ in open-circuit fault.

Fig.16 System results for S_a₁ in short-circuit fault.

Fig.17 System results for S_a₂ in open-circuit fault.

Fig.18 System results for S_a₂ in short-circuit fault.

Fig.19 System results for S_a₃ in open-circuit fault.

Fig.20 System results for S_a₃ in short-circuit fault.

Fig.21 System results for S_a₄ in open-circuit fault.

Fig.22 System results for S_a₄ in short-circuit fault.

Fig.23 System results for S_a₁ and S_b₃ fault.

Fig.24 System results for S_a₁ and S_d₃ fault.

Fig.25 System results for S_a₂ and S_b₄ fault.

Fig.26 System results for S_a₂ and S_d₄ fault.

Fig.27 Sector where the CW flux linkage is located when Table 2 is used.

Fig.28 Sector where the CW flux linkage is located when Table 3 is used.

Fig.29 Sector where the CW flux linkage is located when Tables 4–7 are used.

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