HARMONIC POWER FLOW STUDIES
Abstract
The number and significance of nonlinear harmonic producing devices connected to the power system has increased substantially during the past few years. Principal reasons for this increase include the development of high power semiconductor switches and their application in rectifiers, inverters, and various electronic circuits, and the widespread use of fluorescent lighting. Harmonics have undesirable effects on the power system, including possible harm to system components and customer loads, excessive losses, and communication interference. The present trend is such to expect the number of harmonic producing devices and the levels of voltage and current harmonics on the power system to increase significantly in the future. Conventional electric power flow algorithms do not allow the inclusion of nonlinear devices. Other analysis methods are available, but most assume fundamental frequency bus voltages and, therefore, do not allow interaction between harmonic voltages and currents. None is a true harmonic power flow formulation in which complex power is specified. It is the intent of this research effort to formulate and describe a harmonic power flow algorithm which has been developed for the Electric Power Research Institute RP1764-7, "Harmonic Power Flow Studies." Various system component models, including six and twelve pulse converter and nonlinear resistors, are developed. The emphasis is restricted to lower order harmonics in the audio range, ranging from the fundamental to the 25th - 50th.
Degree
Ph.D.
Subject Area
Electrical engineering
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