Strategies to Improve the Voltage Quality in Active Low-Voltage Distribution Networks Using DSO’s Assets
2016 (English)In: IET Generation, Transmission & Distribution, ISSN 1751-8687, E-ISSN 1751-8695Article in journal (Refereed) Accepted
This paper addresses the problem of voltage variations (i.e. overvoltages) in active low-voltage distribution networks caused by distributed photovoltaic generation. Three strategies based on model predictive control are introduced to improve the voltage level in a cost-optimal way. The compared strategies are the business as usual approach that manipulates a controllable on-load tap changer at the primary substation, the problematic feeder control strategy that adds an additional degree of freedom by controlling the critical secondary substations, and finally the compensation strategy, which controls the primary substation and compensates the non-critical secondary substations. A sensitivity analysis on the control strategies has been conducted comparing the voltage variation reduction and the asset utilization with regards to the accuracy of the prediction models and the forecasted disturbance data. The results show that better (and more costly) characterization of these parameters only provide a marginal improvement in the reduction of the voltage variations due to the restriction caused by the heavy tap change penalization. And the tested case-study shows that the problematic feeder control strategy outperforms the compensation strategy in terms of asset utilization for similar voltage variation reduction. Finally, it is concluded that the choice of the control strategy and the accuracy of the prediction models are important aspects that should be considered to manage the active low-voltage distribution networks in a cost-efficient way.
Place, publisher, year, edition, pages
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-193594OAI: oai:DiVA.org:kth-193594DiVA: diva2:1032948
QCR 201610052016-10-052016-10-052016-10-05Bibliographically approved