| 1. |
- Larsson, Anders, et al.
(author)
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Measurement result from 1 to 48 fluorescent lamps in the frequency range 2 to 150 kHz
- 2010
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In: 14th International Conference on Harmonics and Quality of Power (ICHQP). - Piscataway, NJ : IEEE Communications Society. - 9781424472444 - 9781424472451
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Conference paper (peer-reviewed)abstract
- This paper present measurements performed in the lab where experimental setup of 48 fluorescent lamps powered by high-frequency ballasts. The frequency range of interest is above the traditional harmonic range from 2 kHz up to 150 kHz. In this frequency range the measurements distinguish between two distortions found; recurrent oscillations and remains from the switching at the active power factor correction circuit.
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| 2. |
- Le, Cuong, 1982, et al.
(author)
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Analysis of Power Disturbances from Monitoring Multiple Levels and Locations in a Power System
- 2010
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In: The 14th IEEE Int'l Conf. on Harmonics and Quality of Power, 26-29 Sep. 2010, Bergamo, Italy. - : IEEE Communications Society. - 9781424472444 - 9781424472451
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Conference paper (peer-reviewed)abstract
- This paper proposes a new methodology for diagnosing the original source and underlying causes of power system disturbances, where voltage and current recordings from different locations of a power system are collected. In the proposed method, disturbances are first pre-classified based on the number of transition segments. The spatial zone of the source of disturbances is coarsely determined from voltage recordings only. Disturbances are then further analyzed and characterized by extracting information from both voltages and currents. Finally more accurate information about the location of the source of disturbances is obtained by different techniques depending on the type of disturbances. Several underlying causes are analyzed and classified by using the proposed features extracted from both voltage and current waveforms. Finally, the location of the source of disturbances is refined once the underlying causes are found. Case studies were performed on a large grid-connected wind farm with disturbances from several underlying causes, including: fault, unit tripping, transformer, capacitor, and cable energizing generated by PSCAD/EMTDC.
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| 3. |
- Núñez, Víctor, 1984, et al.
(author)
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Feature Characterization of Power Quality Events According to Their Underlying Causes
- 2010
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In: The 14th IEEE Inte'l Conf. on Harmonics and Quality of Power (ICHQP'10). - Piscataway, NJ : IEEE Communications Society. - 9781424472444 - 9781424472451 ; , s. 8-
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Conference paper (peer-reviewed)abstract
- In this paper are discussed features resulting from the analysis of each underlying cause of power quality (PQ) disturbances. A feature set for each underlying cause is analyzed; likewise, another feature set able to distinguish between the different underlying causes is also analyzed. The proposed feature sets are useful for building suitable frameworks for automatic identification of the underlying cause of events stored in PQ databases. The features are analyzed using real-world and synthetic voltage a current waveforms. A rule-based framework is also proposed and tested. The rules are based on the analyzed features. The framework has obtained a good classification rate of 95.9% demonstrating a high accuracy distinguishing between the different underlying causes in PQ events.
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| 4. |
- Rönnberg, Sarah, et al.
(author)
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Harmonic emission before and after changing to LED and CFL : Part II: Field Measurements for a hotel
- 2010
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In: 14th International Conference onHarmonics and Quality of Power (ICHQP). - Piscataway, NJ : IEEE Communications Society. - 9781424472444 - 9781424472451
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Conference paper (peer-reviewed)abstract
- This paper shows the results of measurements performed with a medium-sized hotel in the North of Sweden. The harmonic emission and other parameters were measured before, during and after a replacement of all incandescent lamps with energy saving lamps, both compact fluorescent lamps (CFL's) and light emitting diodes (LED's). it was not possible to see any major difference in harmonic spectrum before and after the replacement. The reduction in power factor that was observed was completely due to the reduction in active power.
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| 5. |
- Rönnberg, Sarah K., et al.
(author)
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Harmonic emission before and after changing to LED and CFL - Part I: Laboratory measurements for a domestic customer
- 2010
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In: 14th International Conference on Harmonics and Quality of Power (ICHQP). - Piscataway, NJ : IEEE Communications Society. - 9781424472444 - 9781424472451
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Conference paper (peer-reviewed)abstract
- This paper presents an investigation after the impact on a number of power-quality parameters due to the change from incandescent lamps to energy saving lamps like CFL and LED. The measurements were conducted in a full-scale laboratory model with ordinary household equipment connected, thus simulating an ordinary domestic customer. Incandescent lamps have been replaced in stages by CFL and LED lamps. The CFL's and LED lamps will contribute to an increase in current distortion but the amplitude of the harmonics is quite low so the change of lighting will only have a minor effect on the total current harmonic distortion. It is also shown that the (total) power factor is not a good indicator to compare the impact of different loads on the system.
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| 6. |
- Zheng, Ruimin, et al.
(author)
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Harmonic resonances due to a grid-connected wind farm
- 2010
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In: 14th International Conference on Harmonics and Quality of Power (ICHQP). - Piscataway, NJ : IEEE Communications Society. - 9781424472444 - 9781424472451 ; , s. 1-7
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Conference paper (peer-reviewed)abstract
- This paper studies the impact of a grid-connected wind farm on the harmonic resonances. The basic theory on the harmonic resonances is introduced as well as its consequences. The models of wind farm for resonance analysis are presented for both calculations and simulations. The resonance orders and amplifications of voltage distortion with different capacity of capacitor banks are studied under different operation modes. Several case studies with a 200 MW wind farm have been carried out to illustrate the methods for harmonic resonance analysis.
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