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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.

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Voltage dip in the distribution network is caused by disturbance at different voltage levels and experienced by low voltage customers are established. Voltage dips are those disturbances which damage the power quality of the distribution network and causing heavy economic damage to the customers. This chapter investigates procedures of mitigating the voltage dip by reducing the number of faults due to short circuits, lowering the fault clearing time, and changing the power system design and DSTATCOM Compensator with DG and dynamic voltage restorer.