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ABSTRACT
In this study, a current source PWM rectifier (CS-PWM) system combined with vector-oriented control method has been developed for a three-phase self-excited induction generator (SEIG) supplying isolated DC load. Unlike the conventional rectifier scheme, the proposed CS-PWM rectifier uses two numbers of active switches in each leg that are connected with power diode in series to prevent the current reversal of DC link. The adopted decoupled control strategy maintains a constant DC load voltage of 220 V and CS-PWM rectifier input current harmonic content of only 4.82% at the rated 50 Hz frequency. The proposed system performance has been predetermined for various operating conditions using binary search algorithm (BSA) technique and the analysis has been carried out. An abc-dq modeling has been employed for the dynamic performance analysis of the induction generator and simulation of the proposed system has been carried out under both steady state and transient state using Matlab/Simulink toolbox to validate the successful working under various operating conditions.
Nomenclature
| a | = | Frequency in p.u. = fg/fr |
| b | = | speed in p.u = N/Ns |
| C | = | excitation capacitance per phase, F |
| E | = | generator induced emf per phase,, V |
| fg | = | generated frequency, Hz |
| fr | = | rated frequency, Hz |
| Idc | = | DC load current, A |
| Lm | = | magnatising inductance of the generator, H |
| N | = | actual rotor speed, rpm |
| Ns | = | synchronous speed corresponding to the rated frequency, rpm |
| Pdc | = | DC load power, W |
| Pg | = | power output at the generator terminals, W |
| Re, Xe | = | equivalent load resistance and reactance per phase respectively at the generator terminals, Ω |
| R1, R2 | = | per phase stator and rotor (referred to stator)resistance, respectively, Ω |
| X1, X2 | = | per phase stator and rotor (referred to stator)reactance, respectively, Ω |
| Vdc | = | DC load voltage, V |
| Vgl, Vgp | = | phase and line voltages, respectively, at the generator terminals, V |
| Igl, Igp | = | phase and line currents of the generator respectively, A |
| Xm | = | per phase magnetizing reactance of the generator, Ω |
Acknowledgments
The authors gratefully acknowledge the authorities of the National Institute of Technology, Tiruchirappalli, India for all the facilities provided for carrying out the experimental work. The authors further acknowledge Dr. M. Subbiah, Former Professor, Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirappalli, for his valuable suggestions in the preparation of this paper.
Additional information
Notes on contributors
Mahaboob Subahani Akbarali
Mahaboob Subahani Akbarali received the B.E. degree in electrical and electronics engineering from Anna University, Chennai, India, in 2010, and the M.E. degree in power electronics and drives from the same university in 2012. In the same year, he joined the Department of Electrical and Electronics Engineering, PSG College of Technology, Coimbatore, India, as Assistant Professor, since then he has been actively involved in research and teaching. His current research interests include power converter design, electrical machines and control, and renewable power generation systems. He is currently working toward his Ph.D. degree in renewable energy generation systems for dc micro-grid applications at National Institute of Technology, Tiruchirappalli.
Senthilkumar Subramaniam
Senthilkumar Subramaniam received the B.E. degree in electrical and electronics engineering from Madurai Kamaraj University, Madurai, India, in 1999, the M.Tech. degree in electrical drives and control from Pondicherry University, Puducherry, India, in 2005, and the Ph.D. degree in electrical engineering from the National Institute of Technology, Tiruchirappalli, India, in 2013. He has 17 years of teaching experience at various engineering institutions. Since April 2006, he has been an Assistant Professor at the National Institute of Technology. He has extensively researched on self-excited induction generators for standalone and grid-connected applications. His current research interests include the development of new power converter topologies for renewable energy systems.
Kumaresan Natarajan
Kumaresan Natarajan received the B.E. degree from Bangalore University, Bangalore, India, in 1992, and the M.E. degree in power systems from the National Institute of Technology (then Regional Engineering College), Tiruchirappalli, India, in 1994, and the Ph.D. degree from Bharathidasan University, Tiruchirappalli, India, in 2005. Since 1999, he has been with the Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirappalli, where he is currently a Professor. He is the principal author/co-author of over 70 journal and conference papers. He has been granted one Indian patent and filed one Indian patent. He has executed more than five major sponsored and consultancy projects. Kumaresan received the Career Award for Young Teachers in December 2006, instituted by the All India Council for Technical Education, Government of India. His research interests include design and development of electrical machines and power electronic controllers for renewable energy electric conversion systems. Kumaresan is a Fellow of Institution of Engineers, India, Senior Member, IEEE (USA), Member of the IET (UK) and a Life Member of the ISTE, India.