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Simulation study of permanent magnet synchronous machine direct drive wind power generator using three level NPC converter system

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3 Author(s)
Behera, R.K. ; Dept. of Electr. Eng., India Inst. of Technol., Patna, India ; Wenzhong Gao ; Ojo, O.

In this paper, two three-phase three-level neutral point clamped (NPC) converters connected back-to-back are used for a direct drive wind power generator. A permanent magnet synchronous generator (PMSG) is used as the generator, which is driven by the wind turbine. Main problem of voltage unbalance in each electrolyte capacitor is controlled by using a simple chopper control circuit. A simple hardware method for balancing the neutral point (NP) voltage is proposed, which allows enhanced ride-through performance. This method can effectively balance the NP voltage without the limitations of modulation methods and load conditions. It also provides increased ride-through capabilities for the inverter during input voltage sags. Because of the NP balancing, the necessary size of the DC-bus capacitors is reduced. Here, Matlab/Simulink simulation results are presented for the validity of proposed scheme.

Published in:

Power Electronics and Machines in Wind Applications, 2009. PEMWA 2009. IEEE

Date of Conference:

24-26 June 2009

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