Performance enhanced RES current controller with reduced computational complexity

The increased penetration of RES requires the development of advanced control techniques that can work accurately with improved performance and less computational resources under unbalanced and harmonically distorted grid conditions. The paper sets out with a benchmarking study of two existing current control techniques developed for compensating the harmonics and gird voltage unbalance. The techniques are analyzed in terms of their performance and computational complexity. Both techniques can work satisfactory under abnormal grid scenarios, but these techniques are computationally complex and the performance of one under unbalanced conditions is not accurate. The proposed controller (Type 1) presented, eliminates oscillations under unbalanced voltage conditions. Furthermore, it enhances the quality of the injected current and works efficiently with improved performance (low overshoot and less oscillation) at the time of fault. However, it slightly increases the computational complexity something that motivated the development of a further controller (Type 2) that can work with less computational resources and improved performance under such conditions.