A cascaded hybrid inverter with improved dc-link voltage control for grid connected systems
- Authors: Wanjekeche, T. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2012
- Subjects: Voltage-frequency converters , Converters , Electronic circuits
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/17312 , uj:15870 , ISBN: 9781467301589 , Ciatation: Wanjekeche, T.,Jimoh, A.A. & Nicolae, D.V. 2012. A cascaded hybrid inventer with improved dc-link voltage control for grid connected systems IEEE – ISIE 2012, 28–31 May, Hangzhou, China:1950-1956. DOI:10:1109/ISIE.2012.6237391
- Description: Abstract: This paper presents investigation of a new Phase shifted PWM technique with improved harmonic suppression. A novel balance circuit for DC – link voltage balance of two three level legs connected back – to back is designed and tested. Combined with the individual voltage control, a complete voltage controller is developed for a cascaded nine level hybrid model with two cells. Robustness of the proposed algorithm under varying operating conditions and modulation indices is verified by simulation.
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On-line remote and automatic switching of consumers' connection for optimal performance of a distribution feeder
- Authors: Popoola, O. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2007
- Subjects: Phase transformations , Voltage-frequency converters
- Language: English
- Identifier: http://hdl.handle.net/10210/20144 , uj:16073 , ISBN:078038606x , Citation: Popoola, O., Jimoh, A.A. & Nicolae, D. 2007. On-line remote and automatic switching of consumers' connection for optimal performance of a distribution feeder, IEEE AFRICON’07, Windhoek, Namibia, 26-28 September, 2007:1-6. DOI:10.1109/AFRCON.2007.4401536
- Description: Abstract: Load balancing on phases is performed using a conventional trial and error approach. With this approach, service interruption is unavoidable; hence rearrangement of consumers load distribution points on phases cannot be performed frequently. Also phase voltage and current imbalances might improve using this approach but the change does last for too long. To get the secondary distribution to operate at its optimal performance, a technique in the form of remote and automated technology is needed. This paper contributes such a technology at the low voltage side of the distribution network. The proposed static transfer switching technology is based on the open-transition switch that enables transfer or arrangement of consumer loads in a three-phase system within milliseconds and supervisory control system for effective co-ordination, computational and control of other intelligent units
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