A cascaded NPC/H-bridge inverter with simplifiied control strategy and minimum component count
- Wanjekeche, T., Nicolae, Dan-Valentin, Jimoh, A. A.
- Authors: Wanjekeche, T. , Nicolae, Dan-Valentin , Jimoh, A. A.
- Date: 2009
- Subjects: Electric inverters , Harmonics (Electric waves) , Power electronics
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/22319 , uj:16188 , ISBN: 978-1-4244-3919-5 , Citation: Wanjekeche, T., Nicolae, D.V. & Jimoh, A.A. 2009. A cascaded NPC/H-bridge inverter with simplifiied control strategy and minimum component count. Proceedings of IEEE-Africon, 23-25 September, 2009, Kenya. DOI: 10.1109/AFRCON.2009.5308551
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- Authors: Wanjekeche, T. , Nicolae, Dan-Valentin , Jimoh, A. A.
- Date: 2009
- Subjects: Electric inverters , Harmonics (Electric waves) , Power electronics
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/22319 , uj:16188 , ISBN: 978-1-4244-3919-5 , Citation: Wanjekeche, T., Nicolae, D.V. & Jimoh, A.A. 2009. A cascaded NPC/H-bridge inverter with simplifiied control strategy and minimum component count. Proceedings of IEEE-Africon, 23-25 September, 2009, Kenya. DOI: 10.1109/AFRCON.2009.5308551
- Description: Abstract: Please refer to full text to view abstract Please refer to full text to view abstract
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An investigation on optimal current mode control for boost-type PWM rectifiers
- Richards, C. G., Ehlers, P. J., Nicolae, Dan-Valentin
- Authors: Richards, C. G. , Ehlers, P. J. , Nicolae, Dan-Valentin
- Date: 2009
- Subjects: Harmonics , Power electronics , Reactive power (Electrical enginnering)
- Language: English
- Type: Abstract: Static power converters produce harmonics due to the nature of the conversion process. This paper will investigate the effect on the power factor of a sinusoidal and Fryze current reference on a PWM boost type rectifier. It has been shown in previous papers that a Fryze current ref is best. This paper will develop a mathematical model, based on the single sided Fourier expansion. Using this mathematical model it will be shown that even though a high harmonic content could be present in a Fryze controlled PWM boost type rectifier, the power factor has been optimally improved.
- Identifier: http://hdl.handle.net/10210/21241 , uj:16131 , ISBN: 978-1-4244-2235-7 , Citation: Richards, C.G., Ehlers, P.J. & Nicolae, D.V. 2009. An investigation on optimal current mode control for boost-type PWM rectifiers. Proceedings of the IEEE PowerTech Conference, 26 June-02 July 2009, Bucharest, Rumania. DOI: 10.1109/PTC.2009.5282229
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- Authors: Richards, C. G. , Ehlers, P. J. , Nicolae, Dan-Valentin
- Date: 2009
- Subjects: Harmonics , Power electronics , Reactive power (Electrical enginnering)
- Language: English
- Type: Abstract: Static power converters produce harmonics due to the nature of the conversion process. This paper will investigate the effect on the power factor of a sinusoidal and Fryze current reference on a PWM boost type rectifier. It has been shown in previous papers that a Fryze current ref is best. This paper will develop a mathematical model, based on the single sided Fourier expansion. Using this mathematical model it will be shown that even though a high harmonic content could be present in a Fryze controlled PWM boost type rectifier, the power factor has been optimally improved.
- Identifier: http://hdl.handle.net/10210/21241 , uj:16131 , ISBN: 978-1-4244-2235-7 , Citation: Richards, C.G., Ehlers, P.J. & Nicolae, D.V. 2009. An investigation on optimal current mode control for boost-type PWM rectifiers. Proceedings of the IEEE PowerTech Conference, 26 June-02 July 2009, Bucharest, Rumania. DOI: 10.1109/PTC.2009.5282229
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Automating consumer's connections to the distribution network for enhanced performance
- Popoola, O. M., Jimoh, A. A., Nicolae, Dan-Valentin
- Authors: Popoola, O. M. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2010
- Subjects: Power electronics , Electric circuit breakers , Voltage detectors
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/18674 , uj:16029 , ISSN:1827-6660 , Citation: Popoola, O.M., Jimoh, A. & Nicolae, D.V. 2010. Automating consumer's connections to the distribution network for enhanced performance. International Review of Electrical Engineering, 5(5), October 2010.
- Description: Abstract:Trial and error approach which involves service interruption is usually carried out to resolve unbalance on phases in power distribution system. This approach might improve the phase voltage and current but the resultant effect (change) does not last for too long; thereby reduces the market value in terms of quality and reliability of supply. To enhance the performance of the secondary distribution system there is a need for an automating technology. The aim of this paper is to introduce a method and technology developed for resolving imbalances in a secondary distribution system as a result of the uneven distribution of single phase load across a three phase power system. The technology developed is able to monitor, acquire/display collected data and perform self changing switching actions electronically. This action is in form of rearrangement or transfer of consumer loads for optimal performance of the distribution feeder. The proposed switching technology is based on open- transition switch that enables transfer or rearrangement of consumer loads in a three-phase system within milliseconds with supervisory control system. The following methodologies: System Simulator - Matlab (Simulink), Virtual Instrumentation-Lab VIEW and Hardware implementation were applied for the validation of the proposed technique
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- Authors: Popoola, O. M. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2010
- Subjects: Power electronics , Electric circuit breakers , Voltage detectors
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/18674 , uj:16029 , ISSN:1827-6660 , Citation: Popoola, O.M., Jimoh, A. & Nicolae, D.V. 2010. Automating consumer's connections to the distribution network for enhanced performance. International Review of Electrical Engineering, 5(5), October 2010.
- Description: Abstract:Trial and error approach which involves service interruption is usually carried out to resolve unbalance on phases in power distribution system. This approach might improve the phase voltage and current but the resultant effect (change) does not last for too long; thereby reduces the market value in terms of quality and reliability of supply. To enhance the performance of the secondary distribution system there is a need for an automating technology. The aim of this paper is to introduce a method and technology developed for resolving imbalances in a secondary distribution system as a result of the uneven distribution of single phase load across a three phase power system. The technology developed is able to monitor, acquire/display collected data and perform self changing switching actions electronically. This action is in form of rearrangement or transfer of consumer loads for optimal performance of the distribution feeder. The proposed switching technology is based on open- transition switch that enables transfer or rearrangement of consumer loads in a three-phase system within milliseconds with supervisory control system. The following methodologies: System Simulator - Matlab (Simulink), Virtual Instrumentation-Lab VIEW and Hardware implementation were applied for the validation of the proposed technique
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Operating strategies and capacitor voltace balance strategies for a cascaded "3-5-9" hybrid inverter for grid interface application
- Wanjekeche, Tom, Nicolae, Dan-Valentin, Jimoh, Adisa A.
- Authors: Wanjekeche, Tom , Nicolae, Dan-Valentin , Jimoh, Adisa A.
- Date: 2014
- Subjects: Electric power supply , Power electronics
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/17500 , uj:15891 , Citation: Wanjekeche, T., Nicolae, D.V. & Jimoh, A.A. 2014. Operating strategies and capacitor voltace balance strategies for a cascaded "3-5-9" hybrid inverter for grid interface application. International journal of modelling and simulation, 34(1). DOI:10.2316/Journal.205.2014.1.205-5724-5724 , DOI:10.2316/Journal.205.2014.1.205-5724 , ISSN:0228-6203 (Print) , ISSN:1925-7082 (Online)
- Description: Abstract: The paper presents a novel phase shifted SPWM control scheme for cascading two cells to form a “3-5-9 hybrid inverter with improved harmonic suppression. Modeling of the hybrid inverter from first principle is introduced and a standard control law is derived for further analysis and development of the model. A new balance circuit for DC link voltage control is designed and tested. Combined with individual voltage control, a complete control scheme is developed. Detailed MATLAB simulation and experimental results are obtained for further validation of the adopted topology and the control scheme
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- Authors: Wanjekeche, Tom , Nicolae, Dan-Valentin , Jimoh, Adisa A.
- Date: 2014
- Subjects: Electric power supply , Power electronics
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/17500 , uj:15891 , Citation: Wanjekeche, T., Nicolae, D.V. & Jimoh, A.A. 2014. Operating strategies and capacitor voltace balance strategies for a cascaded "3-5-9" hybrid inverter for grid interface application. International journal of modelling and simulation, 34(1). DOI:10.2316/Journal.205.2014.1.205-5724-5724 , DOI:10.2316/Journal.205.2014.1.205-5724 , ISSN:0228-6203 (Print) , ISSN:1925-7082 (Online)
- Description: Abstract: The paper presents a novel phase shifted SPWM control scheme for cascading two cells to form a “3-5-9 hybrid inverter with improved harmonic suppression. Modeling of the hybrid inverter from first principle is introduced and a standard control law is derived for further analysis and development of the model. A new balance circuit for DC link voltage control is designed and tested. Combined with individual voltage control, a complete control scheme is developed. Detailed MATLAB simulation and experimental results are obtained for further validation of the adopted topology and the control scheme
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Using PSIM to investigate harmonic control for boost-type PWM rectifiers
- Ehlers, Pieter J., Richards, Coneth G., Nicolae, Dan-Valentin
- Authors: Ehlers, Pieter J. , Richards, Coneth G. , Nicolae, Dan-Valentin
- Date: 2008
- Subjects: Pulse-duration modulation , Harmonics , Power electronics , Reactive power (Electrical engineering)
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/20421 , uj:16096 , ISBN: 978-1-4244-1770-4 , Citation: Ehlers, P.J., Richards, C.G. & Nicolae, D.V. 2008. Using PSIM to investigate harmonic control for boost-type PWM rectifiers. Proceedings of the 13th International Conference on Harmonics & Quality Power, 28th September-1st October, 2008, Wollongong, Australia.
- Description: Abstract: Static power converters produce harmonics due to the nature of the conversion process. This paper will investigate two variations of current mode control for three-phase power converters ensuring reduced harmonic pollution and power factor improvement. The first method employed uses a Fryze current reference and the second method utilises a balanced three-phase sinusoidal reference. Both control techniques are simulated under unbalanced and distorted supply conditions using the PSIM simulation platform. The results are presented showing that using the Fryze current reference is the best choice.
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- Authors: Ehlers, Pieter J. , Richards, Coneth G. , Nicolae, Dan-Valentin
- Date: 2008
- Subjects: Pulse-duration modulation , Harmonics , Power electronics , Reactive power (Electrical engineering)
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/20421 , uj:16096 , ISBN: 978-1-4244-1770-4 , Citation: Ehlers, P.J., Richards, C.G. & Nicolae, D.V. 2008. Using PSIM to investigate harmonic control for boost-type PWM rectifiers. Proceedings of the 13th International Conference on Harmonics & Quality Power, 28th September-1st October, 2008, Wollongong, Australia.
- Description: Abstract: Static power converters produce harmonics due to the nature of the conversion process. This paper will investigate two variations of current mode control for three-phase power converters ensuring reduced harmonic pollution and power factor improvement. The first method employed uses a Fryze current reference and the second method utilises a balanced three-phase sinusoidal reference. Both control techniques are simulated under unbalanced and distorted supply conditions using the PSIM simulation platform. The results are presented showing that using the Fryze current reference is the best choice.
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