A Multi-Mode Control Strategy for VAr Support by Solar PV Inverters in Distribution Networks

PROJECT TITLE :

A Multi-Mode Control Strategy for VAr Support by Solar PV Inverters in Distribution Networks

ABSTRACT:

This paper proposes a multi-purpose VAr control strategy for solar PV inverters for voltage support in distribution networks. The proposed strategy can be applied beneath varied PV power generation conditions. The inverters can normally operate during a dynamic VAr compensation mode for voltage support (including low PV and no PV periods). During mid-day when PV has surplus power, the proposed strategy can control the PV inverters to absorb VAr for voltage rise mitigation employing a droop characteristic approach. During passing clouds, the strategy can mitigate voltage fluctuations by ramp-rate control of inverter VAr output. A dynamic model of the proposed PV inverter management has been developed to analyze its performance in terms of fast VAr management and voltage support beneath various PV generation conditions. The results of the analysis performed on an Australian distribution system show that the proposed VAr management strategy will mitigate voltage rise, and improve the voltage profile despite potential vast changes within the sun irradiation during passing cloud and additionally in the absence of PV output throughout the evening.

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