Abstract

One of the most challenging issues of the modern power grid is the communication delay, which has adverse effects on the power quality. This paper proposes two methods, such as the fuzzy logic controller (FLC) based approach and the modified predictor method, to minimize the negative effects of time delay on the power quality enhancement in a hybrid power grid consisting of synchronous and wind generators. The thyristor switched capacitor has been used as a power quality enhancement means for the grid. Time delays ranging from 0–700 ms have been considered for the analysis. Both balanced and unbalanced temporary and permanent faults at different locations in the power network have been considered. Two indices, namely the voltage index and the total harmonic distortion have been used to evaluate the power quality of the system. The performance of the FLC-based method has been compared with that of the modified predictor method. Simulations have been performed by using the MATLAB/Simulink software. Simulation results show that both the proposed methods can minimize the negative effects of time delays on the power quality enhancement of the system. However, the FLC method performs better than the modified predictor method.

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