Measurement of power quality under nonsinusoidal condition using wavelet and fuzzy logic

Reliability and quality are the two important facets of power system delivery. A power distribution system is considered to be reliable if all its customers get interruption free power throughout the year. The term power quality may be referred to as maintaining near sinusoidal voltage at rated frequency at the consumers end. In recent times the issues involved with power quality have generated a tremendous amount of interest among power system engineers. In sinusoidal conditions the definitions of power components are unique and expressive. But the traditional definitions of power components become unsuitable under non sinusoidal conditions. The power component definitions under nonsinusoidal conditions have been proposed in IEEE Standard 1459-2000 both for single phase and three phase unbalanced systems. These power component definitions are based on Fourier Transform. In this paper the power components under nonsinusoidal conditions have been calculated using discrete wavelet transform. Then fuzzy logic and has been implemented for the determination of power system components and power quality factor under non sinusoidal condition.