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Overmodulation Strategy for Four-Switch Three-Phase Inverter Based on virtual voltage vector

Overmodulation Strategy for Four-Switch Three-Phase Inverter...

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第36届中国控制会议

作者： Ze Li Ming Zhang Yuanbo Guo Xiaohua Zhang School of Electrical Engineering Dalian University of Technology School of Electrical Engineering & Automation Harbin Institute of Technology

ISBN: (纸本)9781538629185

The four-switch three-phase inverter（FSTPI） is the fault-tolerant topology of the six-switch three-phase inverter（SSTPI）,and the maximum output voltage is limited in the linear modulation ***,an overmodulation strategy for FSTPI is presented,based on virtual voltage vector and superposition principle,in order to improve the utilization of the DC voltage,enhance the output capacity of the inverter and extend the operation range of induction *** with the traditional overmodulation strategy,the proposed strategy can make the inverter transit smoothly from the linear operation to the six-step operation with simple online computation,which is convenient for digital realization and can possess balanced output ***,the relationship between SVPWM and carrier-based PWM in the overmodulation region for FSTPI is *** simulation results illustrate the validity and effectiveness of the theoretical analysis.

关键词： virtual voltage vector superposition principle four-switch three-phase inverter modulated functions

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Direct Torque Control of Traction Motor Fed by Four-switch Inverter with virtual voltage vector

Direct Torque Control of Traction Motor Fed by Four-switch I...

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第37届中国控制会议

作者： Bijun Dai Ze Li Yuanbo Guo Xiaohua Zhang School of Electrical Engineering Dalian University of Technology CRRC Dalian R&D Co. Ltd.

It is necessary to ensure the traction driving system can survive from fault condition when the open-circuit or short-circuit fault of power electronic device occurs. The direct torque control system of traction motor based on fault-tolerant inverter is proposed in this paper. The basic principle of three-phase-four-switch traction inverter is introduced. Moreover, the direct torque control scheme based on virtual voltage vector for traction motor is designed. Meanwhile, an improved observer of stator flux with saturation limiter is employed to restrain the integral drift. Then an approximately circular flux linkage trajectory controller is designed, and the starting excitation scheme is given. Finally, MATLAB/Simulink simulation is carried out to verify the validity and effectiveness of the proposed control strategy.

关键词： Fault-tolerant inverter traction motor direct torque control virtual voltage vector flux observer

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