Simulation Study of Grid-side Improved Control Strategy for Direct-driven Wind Turbine Under Unbalanced Faults

Abstract

Abstract: In order to reduce the power and DC voltage fluctuations of direct-driven wind turbine under unbalanced grid faults, an integrated and improved control strategy for grid-side converter was proposed. In the analysis of grid-side power characteristics, positive and negative sequence components of grid-side voltage and current were calculated by converting them to the same reference frame and a compensation control loop to simultaneously restrain the second harmonic components of active and reactive power was designed on the basis of quasi proportional resonant control. Moreover, to reduce DC-link overvoltage, a feed-forward modified component reflecting the active power error between the two-terminal converters was added to the traditional DC voltage controller. A simulation model of direct-driven wind turbine grid-connected system was built in PSCAD/EMTDC. The simulation results validated that the proposed control strategy can improve the fault ride-through capability of direct-driven wind turbine.

Key words: direct-driven wind turbine, unbalanced faults, second harmonic compensation control, feed-forward control, fault ride-through

CLC Number:

TM464
TM614

Wang Dan, Liu Chongru, Li Gengyin. Simulation Study of Grid-side Improved Control Strategy for Direct-driven Wind Turbine Under Unbalanced Faults[J]. Journal of System Simulation, 2016, 28(5): 1131-1139.

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