Power conversion and control of a magnetic gear integrated permanent magnet generator for wave energy generation

This paper presents results of the control of a magnetic gear integrated permanent magnet synchronous generator (MG-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). The generator has two rotors and one stator. By magnetic gearing, the low speed of the outer rotor is amplified to the high speed of the inner rotor, which faces the stator winding. The machine is designed with a large number of poles and concentrated winding for simpler and cheaper design. However, concentrated winding can have harmonics in the induced electromotive force (emf), which causes harmonic power flow into the dc link of the power converter. In this work, the control system for power conversion from the MG-PMSG is developed and the harmonic content in the power is analyzed. Since, the generator is driven with oscillating speed to generate oscillating power, an energy storage system is integrated to supply smooth power from the system. All corresponding experimental results are provided.

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