Deloading Estimation of a Variable Speed Wind Power System Participating in Frequency Regulation

There is the need of today’s power system that a variable wind turbine system should also participate in the primary frequency regulation (PFR). However, a variable wind power generation system when operating on its maximum capacity, is unable to contribute into the frequency regulation but it is capable to contribute during its deloaded operation. The amount of reserve active power for the frequency regulation depends upon the deloading factor associated with the control of wind power generation system. The service provider needs the this deloading factor and hence the active reserve power for the proper control of frequency. This paper investigates the estimation of the amount of deloading factor and thus active power reserve available with the wind power system which further can be used for the load scheduling and control. The estimation was made by the Unscented Kalman Filter (UKF) with only real power and speed of generator as measurements. The simulation has been done in MATLAB to observe the effectiveness of the proposed estimation.