ABSTRACT
Power quality (PQ) is characterized by stable nominal AC voltage and frequency within specified tolerances, free from voltage flicker, voltage sags or dips, harmonics, frequency variations, and phase angle variations. This chapter deals with technical survey on the research and development of PQ problems related to solar and wind energy integrated to the grid and the impact of poor PQ. Power quality determines the fitness of electrical power to consumer devices. Synchronization of the voltage frequency and phase allows electrical systems to function in their intended manner without significant loss of performance or life. The electric power industry comprises electricity generation, electric power transmission and electricity distribution to an electricity meter located at the premises of the end user of the electric power. Power conditioning is modifying the power to improve its quality. Modern systems use sensors Electronic filters called phasor measurement units (PMU) distributed throughout their network to monitor power quality and in some cases respond automatically to them.
