Multilevel high power converters for reversible power flow between utilities and power pool transmission corridor
- Authors: Nnachi, A. F. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2007
- Subjects: Circuit breakers , Wind-powered generation , Power transmission
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/20003 , uj:16066 , ISBN 078038606x , Citation: Nnachi, A.F., Jimoh,A.A. & Nicolae, D.V. 2007. Multilevel high power converters for reversible power flow between utilities and power pool transmission corridor. IEEE AFRICON'07, Windhoek, Namibia, 26-28 September 2007:1-8. DOI:10.1109/AFRCON.2007.4401473
- Description: Abstract: Multilevel converters have emerged as the state of the art high power conversion for applications in reversible power flow. Electric power could be tapped from or injected to the grid regardless of the discrepancies in voltage levels, frequency, phase number and different modes of operation of the grid and the system. This paper presents an overview of different topologies of multilevel converters and modulation strategies with a verification of back-to-back neutral point converter for bidirectional power flow application
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Phase load balancing in the secondary distribution network using fuzzy logic
- Authors: Siti, M. W. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2007
- Subjects: Circuit breakers , Transmission
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/20257 , uj:16084 , ISBN:078038606x , Citation: Siti, M.W., Jimoh, A.A. & Nicolae, D.-V. 2007. Phase load balancing in the secondary distribution network using fuzzy logic. IEEE AFRICON’07, Windhoek, Namibia, 26-28 September, 2007:1-7. DOI:10.1109/AFRCON.2007.4401569
- Description: Abstract: The electrical network system is to ensure that an adequate supply is available to meet the estimated load of the consumers in both the near and more distant future. This must of course, be done for minimum possible cost consistent with satisfactory reliability and quality of the supply. In order to avoid excessive voltage drop and minimize loss, it may be economical to install apparatus to balance or partially balance the loads. It is believed that the technology to achieve an automatic load balancing lends itself readily for the implementation of different types of algorithms for automatically rearranging the connection of consumers on the low voltage and of a feeder for optimal performance. In this paper the fuzzy logic is been implemented to balance the load in the secondary part of the transformer
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Statistical analysis of operating times of high voltage SF6 circuit breakers
- Authors: Mabunda, N. , Bokoro, P. , Nicolae, Dan-Valentin
- Date: 2016
- Subjects: Circuit breakers , Hypothesis testing
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/123312 , uj:20775 , Citation: Mabunda, N., Bokoro, P & Nicolae, D. 2016. Statistical analysis of operating times of high voltage SF6 circuit breakers.
- Description: Abstract: In this paper the operating times of high voltage SF6 live tank circuit breakers are tested using standard timing tests. The time measurements obtained have proven to be adequate to the normal distribution. The hypothesis testing methodology is applied in order to determine the mean difference value between the tested phase operating times. The results obtained showed that the time difference between the operating times of the tested circuit breakers is located between - 0.661 and 0.536 ms, which indicates that the operating mechanism of the breakers is still reliable and in good condition.
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