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http://dx.doi.org/10.6113/JPE.2012.12.1.172

Unified MPPT Control Strategy for Z-Source Inverter Based Photovoltaic Power Conversion Systems  

Thangaprakash, Sengodan (School of Electrical Systems Engineering, University Malaysia Perlis)
Publication Information
Journal of Power Electronics / v.12, no.1, 2012 , pp. 172-180 More about this Journal
Abstract
Z-source inverters (ZSI) are used to realize both DC voltage boost and DC-AC inversion in single stage with a reduced number of power switching devices. A traditional MPPT control algorithm provides a shoot-through interval which should be inserted in the switching waveforms of the inverter to output the maximum power to the Z-network. At this instant, the voltage across the Z-source capacitor is equal to the output voltage of a PV array at the maximum power point (MPP). The control of the Z-source capacitor voltage beyond the MPP voltage of a PV array is not facilitated in traditional MPPT algorithms. This paper presents a unified MPPT control algorithm to simultaneously achieve MPPT as well as Z-source capacitor voltage control. Development and implementation of the proposed algorithm and a comparison with traditional results are discussed. The effectiveness of the proposed unified MPPT control strategy is implemented in Matlab/Simulink software and verified by experimental results.
Keywords
Capacitor voltage control; Maximum power point tracking; Photovoltaic array; Pulse width modulation; Z-source inverter;
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Times Cited By KSCI : 2  (Citation Analysis)  (Related Records In Web of Science)
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