| Electrical & Electronic Engineering |
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| Study on inverter fault-tolerant operation of PMSM DTC |
| Yznaga Blanco IVONNE, Dan SUN, Yi-kang HE |
| School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; Researches and Electrical Tests Center, Cujae University, Havana City 19390, Cuba |
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Abstract This paper presents an investigation of inverter fault-tolerant operation for a permanent magnet synchronous motor (PMSM) direct torque control (DTC) system under various inverter faults. The performance of a faulty standard 6-switch inverter driven PMSM DTC system is analyzed. To avoid the loss or even disaster caused by the inverter faults, a topology-modified inverter with fault-tolerant capability is introduced, which is reconfigured as a 3-phase 4-switch inverter. The modeling of the 4-switch inverter is then analyzed and a novel DTC strategy with a unique nonlinear perpendicular flux observer and feedback compensation scheme is proposed for obtaining a continuous, disturbance-free drive system. The simulation and experimental results demonstrate that the proposed inverter fault-tolerant PMSM DTC system is able to operate stably and continuously with acceptable static and pretty good dynamic performance.
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Received: 23 July 2007
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