• A.Anjum

This paper presents a robust PI controller design for a three-phase grid-connected photovoltaic (PV) system to control the Active and Reactive power flow in the grid and the dc-link voltage for extracting maximum power from PV units by using a Cascaded multilevel converter. However, power distribution and control in the cascaded PV system faces tough challenge on output voltage over modulation when considering the varied and non-uniform solar energy on segmented PV arrays. This paper addresses this issue and proposes a decoupled active and reactive power control strategy to enhance system operation performance. The relationship between output voltage components of each module and power generation is analyzed with the help of a newly derived vector diagram by using a PI which illustrates the proposed power distribution principle. Finally, a 3-MW, 12-kV PV system with the proposed control strategy is modeled and simulated in MATLAB/Simulink software and the performance also analyzed by using both controllers.

"DECOUPLED ACTIVE AND REACTIVE POWER CONTROL FOR LARGE-SCALE GRID-CONNECTED PHOTOVOLTAIC SYSTEMS USING CASCADED MODULAR MULTILEVEL CONVERTERS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 9, page no.497-506, September-2018, Available :http://www.jetir.org/papers/JETIRE006073.pdf

"DECOUPLED ACTIVE AND REACTIVE POWER CONTROL FOR LARGE-SCALE GRID-CONNECTED PHOTOVOLTAIC SYSTEMS USING CASCADED MODULAR MULTILEVEL CONVERTERS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 9, page no. pp497-506, September-2018, Available at : http://www.jetir.org/papers/JETIRE006073.pdf