A Control Method of Permanent Magnet Wind Generators in Grid Connected Wind Farm to Damp Load Frequency Oscillation

Abstract

This paper proposes a new control method for variable speed wind turbine with permanent magnet synchronous generators (PMSG) in the grid connected wind farm to damp load frequency oscillation of power system. In the wind farm, fixed speed wind turbine with induction generators are also considered to be installed together with the PMSGs. The control system of PMSG is developed in such a way that PMSGs can give contribution to control frequency oscillation of the grid system. The method is based on the control of the kinetic energy stored in rotational mass of the wind turbine and it can be achieved by controlling pitch blade angel and power output reference of the PMSG. Simulation study using multi machine power system model is performed by using PSCAD/EMTDC to demonstrate the effectiveness of the proposed control method.