Title :
A Multilevel Approach for Optimal Participating of Wind Farms at Reactive Power Balancing in Transmission Power System
Author :
Ahmidi, Amir ; Guillaud, Xavier ; Besanger, Yvon ; Blanc, Régis
Author_Institution :
Ecole Centrale de Lille, Univ. of Lille-Nord de France, Villeneuve-d´´Ascq, France
fDate :
6/1/2012 12:00:00 AM
Abstract :
According to the different grid codes, wind farms which are connected to transmission network have to supply not only the active power, but also the reactive power to the grid. The aim of the proposed work is to present an optimal multilevel control system which allows the doubly fed synchronous generator based wind farms to participate at reactive power balancing in transmission network. In this method, we use a multilevel control system, consisting of two levels to regularly calculate the references of all wind turbines. First, the algorithm calculates the optimal reference values of reactive power for each wind farm at its point of common coupling with the grid. Second, it calculates the references of the wind turbines in each wind farm to consider the optimal reactive power references obtained at the first level. The proposed multilevel control system re-calculates the available reserve of the reactive power to determine the optimal references. A probabilistic method based on auto regressive integrated moving average is used to predict the available reactive power reserve which is strongly related to uncertain nature of wind speed. This control system is developed particularly to control the wind farm reactive power injected into the grid. It is well adapted to fluctuating nature of the wind speed. It is also faster than other methods with a global single level optimal control system.
Keywords :
optimal control; power generation control; power grids; reactive power control; synchronous generators; wind power plants; wind turbines; doubly fed synchronous generator based wind farms; global single level optimal control system; grid codes; multilevel control system; optimal multilevel control system; probabilistic method; reactive power balancing; transmission power system; wind turbines; Control systems; Correlation; Monte Carlo methods; Production; Reactive power; Wind farms; Wind turbines; Optimal multilevel control system; transmission power system; voltage/var control; wind farm reactive power forecasting;
Journal_Title :
Systems Journal, IEEE
DOI :
10.1109/JSYST.2011.2163003