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New current control based MPPT technique for single stage grid connected PV systems

DSpace at IIT Bombay

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Title New current control based MPPT technique for single stage grid connected PV systems
 
Creator JAIN, S
AGARWAL, V
 
Subject power-point-tracking
energy-conversion system
photovoltaic systems
conditioning system
inverter
algorithm
phase
buck-boost inverter
continuous conduction mode
just discontinuous current mode
maximum power point tracking
photovoltaic
grid connected
 
Description This paper presents a new maximum power point tracking algorithm based on current control for a single stage grid connected photovoltaic system. The main advantage of this algorithm comes from its ability to predict the approximate amplitude of the reference current waveform or power that can be derived from the PV array with the help of an intermediate variable beta. A variable step size for the change in reference amplitude during initial tracking helps in fast tracking. It is observed that if the reference current amplitude is greater than the array capacity, the system gets unstable (i.e. moves into the positive slope region of the p-v characteristics of the array). The proposed algorithm prevents the PV system from entering the positive slope region of the p-v characteristics. It is also capable of restoring stability if the system goes unstable due to a sudden environmental change. The proposed algorithm has been tested on a new single stage grid connected PV configuration recently developed by the authors to feed sinusoidal current into the grid. The system is operated in a continuous conduction mode to realize advantages such as low device current stress, high efficiency and low EMI. A fast MPPT tracker with single stage inverter topology operating in CCM makes the overall system highly efficient. Specific cases of the system, operating in just discontinuous current mode and discontinuous current mode and their relative merits and demerits are also discussed. (c) 2006
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-25T16:11:23Z
2011-12-26T12:57:08Z
2011-12-27T05:46:57Z
2011-08-25T16:11:23Z
2011-12-26T12:57:08Z
2011-12-27T05:46:57Z
2007
 
Type Article
 
Identifier ENERGY CONVERSION AND MANAGEMENT, 48(2), 625-644
0196-8904
http://dx.doi.org/10.1016/j.enconman.2006.05.018
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11071
http://hdl.handle.net/10054/11071
 
Language en