Minimization of Harmonics Penetration into Transmission and Distribution Systems by Utilizing Tertiary Winding of the Transformer

The transmission and distribution systems are a part and parcel from each other. Thus, the harmonics that produced by the loads in the residential homes has a considerable amount of total harmonics in the transmission systems. The harmonics must be prevented from the propagation into the transmission system. One of the most effective and economical methods that can be used for this purpose is by utilizing the tertiary winding of the substation transformer by creating a tuned low impedance path for the current harmonics. This proposed design has capability to absorb two zero-sequence harmonics and three non-zero-sequence harmonics simultaneously. In this paper a full design of tertiary filter scheme has been developed. SIMULINK-MATLAB has been used to demonstrate and evaluate the performance of this new type of filter scheme.