Harmonic resonance assessment for transmission class shunt capacitors

This paper describes an assessment tool for potential problems associated with high harmonic voltages and harmonic resonance in power transmission systems. The assessment is made in the design phase for placement and sizing of shunt capacitors in the transmission system. The tool employs the IEEE Recommended Practice 519 which specifies the maximum harmonic current at a given transmission bus. If this limiting harmonic current is injected into the transmission system, harmonic voltages will occur. The assessment tool is the evaluation of the resulting harmonic voltage magnitude at the capacitor placement bus, and the evaluation of whether this harmonic voltage magnitude exceeds IEEE 519 limits. If the harmonic voltage exceeds the limit, the given size of the shunt capacitor and / or the proposed location is deemed to be inadvisable or worthy of additional scrutiny. A scan of possible reactive power support values is proposed to identify problematic cases. This is termed a capacitance scan because the scan corresponds to varying reactive power support at a bus. An application in a large interconnected transmission system is shown in the Southwest United States. Suggestions for software implementation are given.

[1]  Timothy J. E. Miller,et al.  Reactive Power Control In Electric Systems , 1982 .

[2]  Li Shusen,et al.  The study 500 kV system harmonics in Central China Power Network , 1998, 8th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.98EX227).

[3]  J. Clare,et al.  A Theoretical Analysis of the Harmonic Content of PWM Waveforms for Multiple-Frequency Modulators , 2010, IEEE Transactions on Power Electronics.

[4]  Ernest W. Flick,et al.  WESTINGHOUSE ELECTRIC CORP. , 1993 .

[5]  E. C. Starr,et al.  Shunt Capacitors in Large Transmission Networks [includes discussion] , 1953, Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems.

[6]  S. B. Crary,et al.  Location of Series Capacitors in High-Voltage Transmission Systems [includes discussion] , 1953, Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems.

[7]  James W. Nilsson,et al.  Electric Circuits , 1983 .

[8]  Dilip V. Sarwate,et al.  The frequency spectrum of pulse width modulated signals , 2003, Signal Process..

[9]  A.P.S. Meliopoulos,et al.  Harmonic monitoring system via GPS-synchronized measurements - update and new developments , 2006, 2006 IEEE Power Engineering Society General Meeting.