A Control Strategy for the Grid-Side Converter of the Directly-Driven Wind Turbine with PM Synchronous Generator under Unbalanced Grid Voltage

Abstract:

A mathematical model of the full power grid-connecting converter at grid side for permanent magnet synchronous generator (PMSG) under unbalanced grid conditions is built, double-frequency oscillation mechanism on DC voltage is analyzed, and the influence of active power ripple of grid-connecting impedance on dual current control is discussed. To suppress the double-frequency oscillation on DC voltage, and take the grid-connected impedance on active power into account, a dual current control strategy, which based on respectively orientating positive-and negative-sequence voltages,is proposed, and introduced the correction value of active power ripple of grid-connecting impedance to correct reference current of proposed control strategy. Simulation results show that the proposed control strategy can effectively control positive and negative-sequence currents,eliminate the DC voltage double-frequency oscillation,and improve harmonic characteristic of grid-connected current.

• Periodical: Advanced Materials Research (Volumes 816-817)
• Pages: 669-677
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.816-817.669
• Online since: September 2013
• Authors: Wei Cai, Hui Min He, Jian Wei Wang, Shao Ze Su
• Keywords: Dual Current Control, Grid-Side Converter, Unbalanced Grid Voltage, Voltage-Oriented, Wind Power Generation

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