چکیده:
With regard to their simplicity and high certainty for electricity production, wind power plants in power system play an important role in supplying energy, hence controlling wind turbines has attracted many attentions during recent years. For accessing to an acceptable level of certainty we should apply special controlling strategies in a way that not only respond to consumers’ demands in normal condition but also do the same in oscillation times such as changes in atmosphere and load. In this research we have used Pitch and STATCOM controllers in wind turbine variable speed Doubly Fed Induction Generators (DFIG), which improve system stability. The results indicate that using STATCOM controller would improve the LVRT capability and would preserve correct performance of connected to grid DFIG wind turbines. In this research we have two wind turbines 2MW connected to grid in IEEE standard 9 bus simulated through MATLAB/SIMULINK package.
خلاصه ماشینی:
Using Pitch and STATCOM Controllers in Variable Speed Wind Turbines for Improving Power Quality and Low Voltage Ride-Through Farhad Zishan1*, Ardeshir Arash2, Aref Jalili3 1- Senior Graduate of Electrical Engineering Ardabil Branch, Islamic Azad University, Ardabil, Iran 2- Faculty Memberof Department of Electrical Engineering Ardabil Branch, Islamic Azad University, Ardabil, Iran *a f.
com Received: November 2017 Accepted: December 2017 Abstract With regard to their simplicity and high certainty for electricity production, wind power plants in power system play an important role in supplying energy, hence controlling wind turbines has attracted many attentions during recent years.
In this research we have used Pitch and STATCOM controllers in wind turbine variable speed Doubly Fed Induction Generators (DFIG), which improve system stability.
The results indicate that using STATCOM controller would improve the LVRT capability and would preserve correct performance of connected to grid DFIG wind turbines.
After reaching to a balance Low Voltage Ride-Through (LVRT) if we want to maintain correct performance of wind turbines during fault time, to have more suitable voltage profile and to improve grid transient respond we can use a Static Compensator (STATCOM) in the grid [6].
The main controlling goal in this area is to obtain maximum power through rotor speed regulation, while blade pitch angle is fixed in its optimal value (nearly close to zero).
Hence, for keeping rotor velocity and turbine production power by controller, pitch angle will be fixed in nominal value.
As it is seen pitch controller plays an important role in fixing rotor speed and production power of wind turbines.