Journal of Power Electronics

  • 제11권4호
  • /
  • Pages.449-455
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  • 2011
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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A Novel Seamless Direct Torque Control for Electric Drive Vehicles

  • Ghaderi, Ahmad (Research & Development Dep. V, Shiga Technical Center, NIDEC Corporation) ;
  • Umeno, Takaji (HV Electric System Laboratory, Toyota Central R&D Labs., Inc.) ;
  • Amano, Yasushi (HV Electric System Laboratory, Toyota Central R&D Labs., Inc.) ;
  • Masaru, Sugai (HV Electric System Laboratory, Toyota Central R&D Labs., Inc.)
  • 투고 : 2010.12.28
  • 발행 : 2011.07.20
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초록

Electric drive vehicles (EDV) have received much attention recently because of their environmental and energy benefits. In an EDV, the motor drive system directly influences the performance of the propulsion system. However, the available DC voltage is limited, which limits the maximum speed of the motors. At high speeds, the inverter voltage increases if the square wave (SW) voltage (six-step operation) is used. Although conventional direct torque control (DTC) has several advantages, it cannot work in the six-step mode required in high-speed applications. In this paper, a single-mode seamless DTC for AC motors is proposed. In this scheme, the trajectory of the reference flux changes continuously between circular and hexagonal paths. Therefore, the armature voltage changes smoothly from a high-frequency switching pattern to a square wave pattern without torque discontinuity. In addition, because multi-mode controllers are not used, implementation is more straightforward. Simulation results show the voltage pattern changes smoothly when the motor speed changes, and consequently, torque control without torque discontinuity is possible in the field weakening area even with a six-step voltage pattern.

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참고문헌

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  4. Feed-Forward Approach in Stator-Flux-Oriented Direct Torque Control of Induction Motor with Space Vector Pulse-Width Modulation vol.16, pp.3, 2016, https://doi.org/10.6113/JPE.2016.16.3.994