Case studies of harmonic problems, analysis, and solutions on transmission systems

Transmission systems around the world are increasingly applying capacitor banks on their transmission systems, primarily to support transmission systems and avoid voltage collapse issues leading to blackouts. Another trend is the utilization of underground cable to obtain right of way in corridors sensitive to overhead lines. These trends both lead to harmonic resonance issues. This paper presents three separate case studies of different situations and concludes with some of the general principles that can be derived from an examination of diverse case studies.