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Energies 2013, 6(7), 3405-3421; doi:10.3390/en6073405
Article

Operation and Control of a Direct-Driven PMSG-Based Wind Turbine System with an Auxiliary Parallel Grid-Side Converter

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Received: 28 March 2013 / Revised: 27 June 2013 / Accepted: 1 July 2013 / Published: 12 July 2013
(This article belongs to the Special Issue Wind Turbines 2013)
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Abstract

In this paper, based on the similarity, in structure and principle, between a grid-connected converter for a direct-driven permanent magnet synchronous generator (D-PMSG) and an active power filter (APF), a new D-PMSG-based wind turbine (WT) system configuration that includes not only an auxiliary converter in parallel with the grid-side converter, but also a coordinated control strategy, is proposed to enhance the low voltage ride through (LVRT) capability and improve power quality. During normal operation, the main grid-side converter maintains the DC-link voltage constant, whereas the auxiliary grid-side converter functions as an APF with harmonic suppression and reactive power compensation to improve the power quality. During grid faults, a hierarchical coordinated control scheme for the generator-side converter, main grid-side converter and auxiliary grid-side converter, depending on the grid voltage sags, is presented to enhance the LVRT capability of the direct-driven PMSG WT. The feasibility and the effectiveness of the proposed system’s topology and hierarchical coordinated control strategy were verified using MATLAB/Simulink simulations.
Keywords: permanent magnet synchronous generator (PMSG); low voltage ride through (LVRT); active power filter (APF); grid fault permanent magnet synchronous generator (PMSG); low voltage ride through (LVRT); active power filter (APF); grid fault
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Wu, Z.; Dou, X.; Chu, J.; Hu, M. Operation and Control of a Direct-Driven PMSG-Based Wind Turbine System with an Auxiliary Parallel Grid-Side Converter. Energies 2013, 6, 3405-3421.

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