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Performance Analysis of a Sliding Mode Control for Distributed Generations
Islam, Gazi,Al-Durra, Ahmed,Muyeen, S.M.,Caruna, Cedric,Tamura, Junji Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.1
This paper presents the performance analysis of a sliding mode based hybrid controller for three phase voltage source inverter. The main objective of this analysis is to observe the effectiveness of the controller for fault ride through (FRT) capability improvement of the distributed generations (DG). The performance of the conventional PI based cascaded controller is also presented for comparison purpose.
Small Signal Stability Analysis of Doubly Fed Induction Generator including SDBR
Shawon, Mohammad Hasanuzzaman,Al-Durra, Ahmed,Caruana, Cedric,Muyeen, S.M. Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.1
This paper presents small signal stability analysis of a doubly fed induction generator (DFIG) based wind farm including series dynamic braking resistor (SDBR) connected at the stator side. A detailed mathematical model of wind turbine, DFIG machine and converters and SDBR is presented in this paper to derive the complete dynamic equations of the studied system. Small signal stability of this system is carried out by modal and sensitivity analysis, participation factors and eigenvalue analysis. Finally, this paper presents an analysis of the dynamic behavior of DFIG based wind farm under voltage dip condition with and without SDBR.
Stability Enhancement of a Hybrid Micro-grid System in Grid Fault Condition
Ambia, Mir Nahidul,Al-Durra, Ahmed,Caruana, Cedric,Muyeen, S.M. Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
Low voltage ride through capability augmentation of a hybrid micro-grid system is presented in this paper which reflects enhanced reliability in the system. The control scheme involves parallel connected multiple ac-dc bidirectional converters. When the micro-grid system is subjected to a severe voltage dip by any transient fault single power converter may not be able to provide necessary reactive power to overcome the severe voltage dip. This paper discusses the control strategy of additional power converter connected in parallel with main converter to support extra reactive power to withstand the severe voltage dip. During transient fault, when the terminal voltage crosses 90% of its pre-fault value, additional converter comes into operation. With the help of additional power converter, the micro-grid system withstands the severe voltage fulfilling the grid code requirements. This multiple converter scheme provides the micro-grid system the capability of low voltage ride through which makes the system more reliable and stable.