In Cairo METRO system electrical power supply, diode rectifiers are commonly used in the front end of a power converter as an interface with the electric utility. Rectifiers are nonlinear in nature and, consequently, generate harmonic currents into the ac power source. The nonlinear operation of the diode rectifiers causes highly distorted input current. The non-sinusoidal shape of the input current that causes a number of problems in the power distribution network. The distorted input current flowing through the system produces distorted voltages at the point of common coupling (PCC). Thus,...