Dynamic model and control of power converters for grid connected renewable energy systems
- Authors: Nnachi, A. F. , Nicolae, Dan-Valentin , Jimoh, A. A.
- Date: 2008
- Subjects: Electric current converters , Renewable energy sources
- Language: English
- Type: Conference procedings
- Identifier: http://hdl.handle.net/10210/20449 , uj:16099 , Citation: Nnachi, A.F., Nicolae, D.V. & Jimoh, A.A. 2008. Dynamic model and control of power converters for grid connected renewable energy systems. Proceedings of the Second IASTED Africa Conference Power and Energy Sysyems (Africa PES 2008), 8-10 September, 2008, Gaborone, Botswana.
- Description: Abstract: In order to investigate certain dynamic events of a grid connected renewable energy system (RES), a systematic model and control is developed. The RES with its converter is taken as a controlled dc current source and the grid side converter model is based on approximate power balance of the dc-link and the ac-side. Here an AC-side decoupled current controller in dq reference frame and simplified net dc-bus voltage controllers are implied. Among different dynamic events that is studied, the response of the system during three-phase to ground fault, step change in reference DC voltage, active and reactive power change are studied and presented.
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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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