Overview
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ABSTRACT
In France, more than 90% of Renewable Energy Sources (RES) are connected to the medium and low voltage distribution network, and their growth requires increased voltage management. Thanks to innovating smart grids solutions, RES integration into networks has been improved. This article gives a state of the art of RES connected to the distribution networks, with its regulatory context. It then describes the following voltage management solutions developed by Enedis, at different stages of maturity: local voltage regulation through MV and LV producers’ reactive power, MV coordinated voltage regulation at the primary substation, the smart non-firm connection offers to MV producers, and the simulation tool under development to evaluate connection impacts for LV producers.
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Laurent KARSENTI: Deputy Head of the Smart Grids Integration and Industrial Deployment Division - Enedis, Paris La Défense, France
INTRODUCTION
Over the past few years, distribution network operators have been faced with a new challenge: that of accommodating an ever-increasing amount of renewable generation, which can represent a significant proportion of the consumption drawn from the same networks. This considerably alters network operation, and in particular the issue of controlling the voltage level supplied to customers. Smart grid solutions provide some technical answers to these problems. France, and in particular Enedis, which manages 95% of the country's distribution networks, has for several years been committed to a smart grids roadmap with two major objectives in mind: firstly, to modernize the network and enhance the performance of its professions, and secondly, to support the players in the power system in the energy transition. In line with this second objective, Enedis has developed, tested and deployed smart grid solutions for voltage and reactive power management in HVA, but also in LV at a less mature stage, enabling better integration of renewable energies (RE) into distribution networks. After an overview of renewable energies connected to the public distribution network and an introduction to the regulatory context and the regional grid connection schemes for renewable energies (S3REnR) in particular, this article presents various solutions at different stages of maturity implemented in France: local voltage regulation using the reactive power of HV and LV connected producers, coordinated HV voltage regulation at the source substation level, intelligent connection offers with modulated HV power, and a simulation tool for assessing the network impacts of one's LV connection currently under development. Following the development of solutions and the implementation of demonstrators, the most mature solutions have now entered the industrialization phase and are being deployed nationwide, in a targeted manner to optimize their technical and economic value.
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KEYWORDS
distribution networks | smart grid | RES integration | voltage management | reactive management
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Smart grid solutions for better integration of renewable energies into distribution networks
Bibliography
Regulations
Code de l'Énergie, decree and order of 23/04/08, decree of 28/08/07, decree of 20/04/12, order of 02/07/14, deliberations of the Commission de régulation de l'énergie (CRE) on smart electricity grids (REI) of 12/06/14 and 08/12/16.
Patents
Enedis patents on local and coordinated voltage regulation processes
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