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The transient power characteristic of wind power grid-connected system will affect the operation and management of power grid. In this paper, the transient model of direct-driven permanent magnet wind power unit is established by PSCAD/EMTDC. The simulation shows that the direct-driven permanent magnet wind power unit operates with high current during low voltage. The transient reactive load characteristic of wind power collection line is revealed. The influence factors on transient reactive power characteristic is studied. Additionally, how the wind power output, the collecting line impedance, the current amplitude limiting, control strategy and reactive power control affect the transient reactive power characteristics of the collection line are also analyzed.

Transient Power Characteristics of Direct-driven Permanent Magnet Wind Power Grid-connected System