INCREASE mitigates overvoltage in LV grid

Penetration of distributed renewable energy sources in LV networks is increasing steadily. This trend helps the vision of sustainability, but it is hindered by various economic and technical constraints. Some of the existing solutions put customers in a disadvantageous position, which is often overlooked while developing technical solutions. The INCREASE team analyzed the most common solutions to cope with overvoltage, including inverters with ON/OFF switching and droop-based control features.

These two techniques place customers connected at the end of a radial feeder in a disadvantageous position. As their power generation is curtailed more than their counterparts who are connected closer to the MV/LV transformer. This situation is generally known as unfair power curtailment.

INCREASE proposes an efficient solution for voltage rise which mitigates voltage rise using conventional droop control techniques, but also provides fair power curtailment among all customers by exploiting the sensitivity matrix of the examined radial feeder. The proposed control strategy is implemented in a flexible simulation platform, based on MATLAB and Open DSS. Results on a LV radial feeder are compared with the corresponding results obtained by conventional droop control methods, highlighting the superior performance of the proposed control strategy.

These results show that equal power curtailment of inverters is successfully achieved, but it also leads to an increased net power curtailment along the feeder. More research will be conducted to reduce this net active power curtailment, while preserving the proposed control strategy.

A paper about fair power curtailment and the research was written and submitted for the Powertech Conference 2015 by M. M. M. A. Viyathukattuva, P. H. Nguyen, and W. L. Kling of the Eindhoven University of Technology, and A. I. Chrysochos, T. A. Papadopoulos and G. K. Papagiannis of the Aristotle University of Thessaloniki: Fair power curtailment of Distributed Energy Sources to mitigate overvoltages in Low-Voltage networks.