Comparison of Voltage Oriented Control and Direct Power Control under Command Mode Transition for PMSG Wind Turbines

  • Kwon, Gookmin (Department of Electrical Engineering, Smart Grid Research Center, Chonbuk National University) ;
  • Suh, Yongsug (Department of Electrical Engineering, Smart Grid Research Center, Chonbuk National University)
  • Published : 2016.07.05

Abstract

This paper proposes a comparison of Voltage Oriented Control (VOC) and Direct Power Control (DPC) under command mode transition for PMSG Wind Turbines (WT). Based on a neutral point clamped three level back to back type Voltage Source Converter (VSC), proposed control scheme automatically control the generated output power to satisfy a grid requirement from the hierarchical wind farm controller. Automatic command mode transition based on the dc-link voltage error provides a command mode changing between grid command and MPPT mode. It is confirmed through PLECS simulations in Matlab. Simulation result shows that proposed control scheme of VOC and DPC achieves a much shorter transient time of generated output power than the conventional control scheme of MPPT with optimal torque control and VOC under a step response. The proposed control scheme makes it possible to provide a good dynamic performance for PMSG wind turbines in order to generate a high quality output power.

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