A novel implementation of fuzzy pi based distributed power flow controller for power quality improvement and mitigation

The new inventions in technology lead to more power consumption by more number of nonlinear loads, which in turn effecting the quality of power transmitted. The power transmitted in a line is needed to be of high quality. The flow of power basically depends on the line impedance, sending end and receiving end voltage magnitudes. Nonlinear loads create harmonic currents which in turn creates system resonance, capacitor overloading, decrease in efficiency, voltage magnitude changes. The DPFC is a new FACTS device, employs the distributed FACTS (D-FACTS) concept, which is to use multiple small-size single-phase converters instead of the one large-size three-phase series converter in the UPFC. The large number of series converters provides redundancy, thereby increasing the system reliability. The DPFC has the same control capability as the UPFC, which comprises the adjustment of the line impedance, the transmission angle, and the bus voltage. The principle and analysis of the DPFC are presented in this research and the corresponding experimental results are shown.