What is Total Harmonic Distortion (THD)

In this chapter various harmonic sources and their effect on the distribution network and its mitigation procedures are discussed. In the distribution network, electrical power is mostly utilized for our daily activity. However, the quality of power in the distribution network is affected by different disturbances. The distribution power quality problems deteriorate the performance of the system. One of the disturbances of the distribution network is harmonic distortion. Disturbances not only produce excessive heat in the devices and appliances used in the daily life of human beings, but also reduce the life of the appliances. Finally, the harmonic distortion mitigation by using active power filter, space vector pulse width modulation, dynamic voltage restorer, voltage phase shift, and fuzzy logic controller is discussed.