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Hybrid Excitation Topologies and Control Strategies of Stator Permanent Magnet Machines for DC Power System

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2 Author(s)
Yu Wang ; Dept. of Electr. Eng., Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China ; Zhiquan Deng

The stator permanent magnet (PM) machines have simple and robust rotor structure as well as high torque density. The hybrid excitation topology can realize flux regulation and wide constant power operating capability of the stator PM machines when used in dc power systems. This paper compares and analyzes the electromagnetic performance of different hybrid excitation stator PM machines according to different combination modes of PMs, excitation winding, and iron flux bridge. Then, the control strategies for voltage regulation of dc power systems are discussed based on different critical control variables including the excitation current, the armature current, and the electromagnetic torque. Furthermore, an improved direct torque control (DTC) strategy is investigated to improve system performance. A parallel hybrid excitation flux-switching generator employing the improved DTC which shows excellent dynamic and steady-state performance has been achieved experimentally.

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Industrial Electronics, IEEE Transactions on  (Volume:59 ,  Issue: 12 )