Title:
ONE-PHASE SHORT-CIRCUIT FAULT-TOLERANT DIRECT TORQUE CONTROL METHOD FOR FIVE-PHASE PERMANENT-MAGNET MOTOR
Document Type and Number:
WIPO Patent Application WO/2020/147162
Kind Code:
A1
Abstract:
Disclosed is a one-phase short-circuit fault-tolerant direct torque control method for a five-phase permanent-magnet motor. When phase A experiences an open-circuit fault, a non-faulty phase open-circuit fault-tolerant current, a fault-tolerant transformation matrix T4/2, and an inverse matrix T2/4 for a fault-tolerant operation of the motor are deduced on the basis of the constraints of the flux vector of a stator remaining unchanged before and after a fault, the sum of the currents of non-faulty phases being zero, and minimal copper consumption; when phase A experiences a short-circuit fault, a remaining non-faulty phase compensation flux linkage is deduced on the basis of the constraints of the flux vector of a stator remaining unchanged before and after a fault, the principle of minimal copper consumption or non-faulty phase compensation currents being equivalent in terms of amplitude, and the sum of remaining non-faulty phase compensation currents being zero; and a stator phase voltage instruction is derived by combining a stator flux linkage with a torque observer, a rated torque and a stator flux linkage amplitude, and a coordinate transformation. The voltage combines a pulse width modulation technique based on zero-sequence voltage injection to implement consistent steady-state performance and dynamic performance before and after a motor short-circuit fault; moreover, the frequency of an inverter switch is constant, and the overhead for a CPU is low.
Inventors:
ZHOU HUAWEI (CN)
ZHOU CHENG (CN)
TAO WEIGUO (CN)
XU JINHUI (CN)
ZHANG DUO (CN)
LIU GUOHAI (CN)
ZHOU CHENG (CN)
TAO WEIGUO (CN)
XU JINHUI (CN)
ZHANG DUO (CN)
LIU GUOHAI (CN)
Application Number:
PCT/CN2019/075503
Publication Date:
July 23, 2020
Filing Date:
February 20, 2019
Export Citation:
Assignee:
UNIV JIANGSU (CN)
International Classes:
H02P21/13
Foreign References:
| CN105245156A | 2016-01-13 | |||
| CN106208871A | 2016-12-07 | |||
| CN108832869A | 2018-11-16 | |||
| CN106208891A | 2016-12-07 | |||
| US9787237B2 | 2017-10-10 |
Attorney, Agent or Firm:
JW IP LAW FIRM (CN)
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