Electrical Power Systems Quality, Second Edition
This book provides a non-mathematical guide to basic power-quality strategies and methods used to protect electronic systems.
TABLE OF CONTENTS Electrical Power Systems Quality, Second Edition
6.4: Harmonic Studies
6.4 Harmonic Studies
Harmonic studies play an important role in characterizing and understanding the extent of harmonic problems. Harmonic studies are often performed when
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Finding a solution to an existing harmonic problem
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Installing large capacitor banks on utility distribution systems or industrial power systems
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Installing large nonlinear devices or loads
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Designing a harmonic filter
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Converting a power factor capacitor bank to a harmonic filter
Harmonic studies provide a means to evaluate various possible solutions and their effectiveness under a wide range of conditions before implementing a final solution. In this section, methods for carrying out harmonic studies are presented.
6.4.1 Harmonic study procedure
The ideal procedure for performing a power systems harmonics study can be summarized as follows:
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Determine the objectives of the study. This is important to keep the investigation on track. For example, the objective might be to identify what is causing an existing problem and solve it. Another might be to determine if a new plant expansion containing equipment such as adjustable-speed drives and capacitors is likely to have problems.
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If the system is complex, make a premeasurement computer simulation based on the best information available. Measurements are expensive in terms of labor, equipment, and possible disruption to plant operations. It will generally be economical to have a good idea what to look for and where to look before beginning the measurements.
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Make measurements of the existing harmonic conditions, characterizing sources of harmonic currents and system bus voltage distortion.
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Calibrate the computer model using the measurements.
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Study...
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