TABLE OF CONTENTS Today, our society has become very aware of the necessity of the natural environment protection of our living plant in the face of a programmed utilization of natural resource. Like the earth, the utility power supply that we are now using was clean when it was invented in nineteenth century. Over hundred years, electrical power system has benefited people in every aspect. Meanwhile, due to the intensive use of this utility, the power supply condition becomes "polluted." However, public concern about the "dirty" environment in the power system has not been drawn until the mid 1980s [1-6].
Since ac electrical energy is the most convenient form of energy to be generated, transmitted, and distributed, ac power systems had been swiftly introduced into industries and residences since the turn of the twentieth century. With the proliferation of utilization of electrical energy, more and more heavy loads have been connected into the power system. During 1960s, large electricity consumers such as electrochemical and electrometallurgical industries applied capacitors as VAR compensator to their systems to minimize the demanded charges from utility companies and to stabilize the supply voltages. As these capacitors present low impedance in the system, harmonic currents are drawn from the line. Owing to the non-zero system impedance, line voltage distortion will be incurred and propagated. The contaminative harmonics can decline power quality and affect...
