Ride-through of PMSG Wind Power System Under the Distorted and Unbalanced Grid Voltage Dips

  • Sim, Jun-Bo (Wind turbine research department, Hyundai heavy industry) ;
  • Kim, Ki-Cheol (Wind turbine research department, Hyundai heavy industry) ;
  • Son, Rak-Won (Wind turbine research department, Hyundai heavy industry) ;
  • Oh, Joong-Ki (Wind turbine research department, Hyundai heavy industry)
  • Received : 2011.09.03
  • Accepted : 2012.08.20
  • Published : 2012.11.01


This paper presents a ride-through skill of PMSG wind turbine system under the distorted and unbalanced grid voltage dips. When voltage dips occur in the grid, pitch control and generator speed control as well as a parallel resistor of DC-link help to keep the turbine's safety. Modern grid code requires a wind turbine to supply reactive currents to help voltage recovery after grid faults clearance. In order to supply reactive currents to the grid in case of the distortedly unbalanced grid voltage dips, a special PLL is needed to control the grid side converter and to regulate the grid voltages symmetrically. The proposed method is applied to 2MW multi-pole PMSG wind turbine system, and verified by simulation.


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