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

Sengodan Thangaprakash

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

Sengodan Thangaprakash

Vol. 12, No. 1, pp. 172-180, Jan. 2012

10.6113/JPE.2012.12.1.172

Capacitor voltage control

Maximum power point tracking

Photovoltaic array

Pulse width modulation

Z-source inverter

PDF

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.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

S. Thangaprakash, "Unified MPPT Control Strategy for Z-Source Inverter Based Photovoltaic Power Conversion Systems," Journal of Power Electronics, vol. 12, no. 1, pp. 172-180, 2012. DOI: 10.6113/JPE.2012.12.1.172.

[ACM Style]

Sengodan Thangaprakash. 2012. Unified MPPT Control Strategy for Z-Source Inverter Based Photovoltaic Power Conversion Systems. Journal of Power Electronics, 12, 1, (2012), 172-180. DOI: 10.6113/JPE.2012.12.1.172.