PSCAD/EMTDC Study SCRLoading 0.1500 + j0.0750 pu0.3000 + j0.1500 pu0.4500 + j0.2250 pu System Strength R=0.0075 L=8.0214e-5 Run 1 Load Point 1 = 5398.7378 Run 5 Load Point 1 = 2699.3689 Run 9 Load Point 1 = 1799.579 R=0.075 L=8.0214e-4 Run 2 Load Point 1 = 539.8738 Run 6 Load Point 1 = 269.9369 Run 10 Load Point 1 = 179.9579 R=0.75 L=8.0214e-3 Run 3 Load Point 1 = 53.9874 Run 7 Load Point 1 = 26.9937 Run 11 Load Point 1 = 17.9958 R=7.5 L=8.0214e-3 Run 4 Load Point 1 = 5.3987 Run 8 Load Point 1 = 2.6994 Run 12 Load Point 1 = 1.7996
5. Other studies Study 1: D.J. Pileggi, T.J. Gentile, A.E. Emanual,… et al, The Effect of Modern Compact Fluorescent Lights On Voltage Distortion, IEEE Trans. Of Power Delivery, Vol. 8, No. 4, Oct. 1993, pp 2038-1042 Study 2: F.V. Topalis, Efficiency Of Energy Saving Lamps And Harmonic Distortion In Distribution Systems, IEEE Trans. of Power Delivery, Vol. 8, No. 4, Oct. 1993, pp 2038-1042 Study 3: T.-M. Zhou, X.-Y. Zhu, Y.-L. He, W. Cheng and J. Schlejen, Preliminary Investigation to the Effect of Harmonic Distortion by CFL on Quality of Electric Power Systems, (Published?) Study 4: N. Gothelf, Power Quality Effects of CFLs– A Field Study, RIGHT LIGHT 4, 1997 VOLUME 2, pp. 77-81
Study 1 Electronically ballasted fluorescent lights with highly distorted current may jeopardize the reliability of the distribution system and the quality of the electric power delivered. D.J. Pileggi, T.J. Gentile, A.E. Emanual,… et al, The Effect of Modern Compact Fluorescent Lights On Voltage Distortion, IEEE Trans. Of Power Delivery, Vol. 8, No. 4, Oct. 1993, pp 2038-1042
Study 2 These conclusions permit the formulation of the opinion that the extensive future use of the energy efficient lamps must be associated with simple and low cost filtering and power factor correction techniques F.V. Topalis, Efficiency Of Energy Saving Lamps And Harmonic Distortion In Distribution Systems, IEEE Trans. of Power Delivery, Vol. 8, No. 4, Oct. 1993, pp 2038-1042
Study 3 T.-M. Zhou, X.-Y. Zhu, Y.-L. He, W. Cheng and J. Schlejen, Preliminary Investigation to the Effect of Harmonic Distortion by CFL on Quality of Electric Power Systems Four Cases: Single Lamp Home Lab retrofit Field Experiment
Study 3 Our experiments show that for CFL THD according to the new IEC 1000 proposal, in extremely high home applications (5 CFLs per home), the contribution to the V-THD is negligible, compared to TV and much less than computer.
Home Experiment ? ? THD I PC 120% (NZ 66.6%) CFL 101-103% (NZ 120%) TV 90% (NZ 120%)
V-THD variation 1.5-2%. Experiment repeated 8 times
Study 4 The test was divided in two phases: Phase 1: Measurements in a one-family house. The measurements were taken first without CFLs and then after installing five CFLs. Phase 2: Measurements in a residential district. The measurements were taken in a residential district consisting of 17 houses at existing load and then after installing of three and six CFLs respectively in each house.
Study 4 The study shows that replacement of incandescent lamps with CFLs is beneficial both for users and for utilities. The main advantages of CFLs are: - reduced energy consumption - long lifetime - released capacity of the distribution system High harmonic distortion is the main reason that utilities hesitate to advocate increased use of CFLs. They focus mainly on the high relative current distortion. It is true that for CFLs, the relative current distortion expressed in percent of the fundamental may exceed 100%. However, since fundamental current is very low …, the values of harmonic currents are very low too.
Study 4 The results indicate, that the harmonic generated by the CFLs in residential districts have only a minor effect on power quality of the supply network. N. Gothelf, Power Quality Effects of CFLs– A Field Study, RIGHT LIGHT 4, 1997 VOLUME 2, pp. 77-81
This current waveform is significantly better than most we see in sold in New Zealand
Some of the Brands Tested Basix Canopower Connection Dura Lamp Eclipse Ecobulb Elite Everyhome GE Kempthorne LuxTec Marexim Mirabella Nelson Lamps No Frills Osram Panasonic Philips Results Signature Range SmartLamp Toshiba Wotan
6. Conclusions The wide-spread use of CFLs can be expected to reduce power quality. The weaker networks exhibit less correlation in the harmonic current injection than stronger networks. Resonances between CFL and ac network magnifies some frequency components (even for a relatively strong ac network)
Acknowledgements Tas Scott & Stephen Hirsch, Orion N.Z. Ltd Vinod Kumar, Whisper Tech Limited Joseph Lawrence, EPE Centre Manager Lance Frater Ken Smart Geoff Neville, Enermet N.Z. Ltd.
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