Postfault Zero-Sequence Current Injection for Open-Circuit Diode/Switch Failure in Open-End Winding PMSM Machines

Zhu, Bin; Tan, Cheng; Farshadnia, Mohammad; Fletcher, John

doi:10.1109/tie.2018.2868007

Cited by 28 publications

(19 citation statements)

References 22 publications

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“…Also, the highest phase rms current has been reduced in a post‐fault condition which leads to an increase in the maximum post‐fault torque per ampere. Table 3 shows that the experimental maximum post‐fault torque per unit of 0.679 is achieved for the proposed strategy compares with 0.643 for the technique in [16]. Thus, an increase of 5.6% in the post‐fault torque is observed experimentally, compared with a simulated 7.9% in the post‐fault torque.…”

Section: Resultsmentioning

confidence: 86%

“…Results show the proposed strategy eliminates the need for current flow through the open‐circuited switches in phase a to synthesize the required voltage state, as i a > 0. In addition, results show a decrease of 0.057 and 0.053 per unit in the i c and i d rms currents and an increase of 0.382, 0.168 and 0.148 per unit in the i a , i b and i e rms currents compared with the technique proposed in [16]. Also, the highest phase rms current has been reduced in a post‐fault condition which leads to an increase in the maximum post‐fault torque per ampere.…”

Section: Resultsmentioning

confidence: 97%

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Fault‐tolerant strategies for open‐circuit switch failures in open‐end winding PMSM drives

Zhu

Priestley

Fletcher

2021

J. eng.

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Many safety‐critical drive systems require post‐fault operation after an open‐circuit switch failure occurs in the inverter. The open‐end winding inverter topology facilitates the injection of zero‐sequence current such that a faulty switch leg can still be used to generate sufficient voltage states to continue operation. Therefore, only a minimal increase in the post‐fault torque ripple is experienced. However, the injection of this zero‐sequence current results in an increase in the copper loss which de‐rates the maximum post‐fault torque of the machine. Existing post‐fault techniques that inject zero‐sequence current, during an open‐circuit switch fault, do not minimize the copper loss resulting in sub‐optimal post‐fault torque per ampere. A method for reducing copper loss by optimizing the zero‐sequence current waveform to achieve the maximum post‐fault torque per ampere is proposed here. The proposed strategy has been experimentally assessed for both three‐phase and five‐phase drive systems. The experimental results demonstrate the continuous post‐fault operation of the drive system with a more balanced thermal load distribution between phases. A 2.8% and 5.6% improvement in post‐fault torque per ampere for three‐phase and five‐phase systems are demonstrated.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 97%

Fault‐tolerant strategies for open‐circuit switch failures in open‐end winding PMSM drives

Zhu

Priestley

Fletcher

2021

J. eng.

Self Cite

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“…Furthermore, the corresponding reference voltages before and after the adjustment with (3)- (5) are given in Fig. 7.…”

Section: Fig 3 Modulation Sequences Of S B1 and S B2 Under Positive mentioning

confidence: 99%

“…In [4], the open‐phase fault tolerant control scheme is proposed in the OW‐PMSM system, in which the two orthogonal non‐zero voltage vectors are universally applied for the modulation. In [5], a zero‐sequence current injection‐based method is proposed for the open‐circuit diode or switch device failure in the OW‐PMSM system, in which the polarity of phase current associated with the fault bridge is constrained.…”

Section: Introductionmentioning

confidence: 99%

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Fault‐tolerant control strategy with reduced switching frequency for inverter‐based fault in open‐winding PMSM system

Dong

Liu

et al. 2020

Electron. lett.

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The open‐winding permanent magnet synchronous machine (OW‐PMSM) system is widely investigated for its potential fault tolerance while extra switching loss is inevitable due to the doubled switch devices. Hence, to further improve its performance, a fault‐tolerant control strategy against the inverter‐based fault, in which the corresponding terminal of the phase winding is connected with the mid‐point of the two capacitances in parallel to the dc voltage, is proposed in this Letter. In the proposed method, the reference voltages are modulated under the three‐phase stationary coordinate system, considering the voltage fluctuation of the capacitances. In addition, to reduce the switching frequency, the reference voltages are adjusted synchronously, according to the polarity of the reference voltages. Moreover, the effective modulation range of the proposed method is analysed. Finally, the performance of the proposed strategy is validated experimentally.

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Overview and Impact of Faults in Grid‐Connected Photovoltaic Systems

Khan

2022

Fault Analysis and Its Impact on Grid‐connected Photovoltaic Systems Performance

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Postfault Zero-Sequence Current Injection for Open-Circuit Diode/Switch Failure in Open-End Winding PMSM Machines

Cited by 28 publications

References 22 publications

Fault‐tolerant strategies for open‐circuit switch failures in open‐end winding PMSM drives

Fault‐tolerant strategies for open‐circuit switch failures in open‐end winding PMSM drives

Fault‐tolerant control strategy with reduced switching frequency for inverter‐based fault in open‐winding PMSM system

Overview and Impact of Faults in Grid‐Connected Photovoltaic Systems

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