Determining harmonic characteristics of typical single phase non-linear loads

Harmonic distortion in typical commercial office buildings is growing due to the widespread use of single phase nonlinear loads. This paper presents a method for developing various non-linear load models so as to analyze the current harmonic waveform characteristics of these loads. The electromagnetic transient simulation program (PSCAD/EMTDC) was used in modeling some of the non-linear loads such as personal computers, uninterruptible power supply and fluorescent lamp with electronic ballast. Simulation results provide the estimate of the harmonic currents in terms of the total harmonic distortion and the individual harmonic current components. The results obtained from simulations are then verified by the experimental results.

[1]  Leon M. Tolbert,et al.  Survey of harmonics measurements in electrical distribution systems , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[2]  Alexander E. Emanuel,et al.  The effect of modern compact fluorescent lights on voltage distortion , 1993 .

[3]  W. M. Grady,et al.  Analysis of compensation factors influencing the net harmonic current produced by single-phase nonlinear loads , 1998, 8th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.98EX227).

[4]  E.F. El-Saadany.  Parameters affecting harmonic propagation and distortion levels in nonlinear distribution systems , 2002, IEEE Power Engineering Society Summer Meeting,.

[5]  P. Verde,et al.  Estimating the net harmonic currents produced by selected distributed single-phase loads: computers, televisions, and incandescent light dimmers , 2002, 2002 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.02CH37309).

[6]  U. Grasselli,et al.  Time-varying harmonics of single-phase nonlinear appliances , 2002, 2002 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.02CH37309).

[7]  Regina Lamedica,et al.  Estimation of net harmonic currents due to dispersed nonlinear loads within residential areas , 1998, 8th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.98EX227).

[8]  Zhu Jun,et al.  Typical industrial LV system for harmonic propagation study under balanced and unbalanced conditions using Pspice models , 1999, Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475).

[9]  D. M. Vilathgamuwa,et al.  A PSpice model for the electrical characteristics of fluorescent lamps , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[10]  Wu Jun,et al.  Simulation of power quality problems on a university distribution system , 2000, 2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134).