Active and Reactive Power Distribution among Cascaded PV Inverter Modules
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2016, Vol 4, Issue 7
Abstract
Large-scale grid-connected photovoltaic (PV) systems contribute to renewable energy growth, which has inspired the application of cascaded modular multilevel converters due to their unique features such as modular structures, enhanced energy harvesting capability and so on. However, power distribution and control in the cascaded PV system faces tough challenge on output voltage over modulation when considering the non uniform solar energy on segmented PV arrays. This paper presents a decoupled active and reactive power control strategy to improve 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 which illustrates the proposed power distribution principle. On top of this, an effective control system including active and reactive components extraction, voltage distribution and synthesization, is developed to achieve independent active and reactive power distribution and mitigate the aforementioned issue. Simulation results are provided to demonstrate the effectiveness of the proposed control strategy for large-scale grid-connected cascaded PV systems.
Authors and Affiliations
Patil Mounica
Keywords
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- EP ID EP22414
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