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pubblicazioni - Memoria

Advanced voltage regulation system for MV networks with DG: prospective technical and economic performances

pubblicazioni - Memoria

Advanced voltage regulation system for MV networks with DG: prospective technical and economic performances

Spreading of Distributed Energy Resources (DERs), especially from Renewable Energy Sources (RESs), entails possible problems on distribution networks. New control strategies may support DERs diffusion (by enhancing the hosting capacity), guarantee safety, adequate quality of service and fulfilment of important technical requirements. However, current connection rules and regulation prevent from a larger DERs diffusion: in some operating conditions, currently not widely diffused but expected to become more and more frequent in the near future, a central Distribution Management System (DMS) interacting with DERs may become necessary in order to operate the distribution network in the presence of diffuse generation and storage systems, also increasing safety and respecting reliability constraints. Implementation of Active Distribution Networks (ADNs) will depend not only on development of suitable technical rules but, especially, on a clear and stable regulatory framework. The present work deals with the problem of voltage control in ADNs. The paper starts by depicting the current state-of-the-art, based on a review of international trends sifted by experience of the authors. On the basis of representative samples of real MV distribution networks, the paper will identify some specific but meaningful conditions (in terms of network topology and resources sizing and siting) where current voltage regulation is not sufficient to guarantee adequate levels of power quality while allowing all desired DERs connections. Then, possible improvement in terms of hosting capacity will be explored, considering the presence of a centralised control system that coordinates DERs (including storage systems) in order to maintain voltages and currents within the allowed ranges, minimizing costs of control actions. The proposed control procedure is going to be tested in real networks within EU projects on Active Distribution Networks.

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