The energy transition comes along with an increase of voltage variations especially on the LV (Low Voltage) network due to photovoltaic (PV) generation influence. In the scope of the French smart grid demonstrator GreenLys, and in order to limit these variations, an OLTC (On Load Tap Changer) has been experimented in a secondary substation in Lyon since November 2015. It has been associated through PLC (Power Line Communication) with several voltage sensors wisely placed on the LV network to get a precise vision of the voltage on the network fed by the transformer. This paper describes the voltage regulation infrastructure implemented and its main outcomes.
The integration of Distributed Energy Resources (DER) is impacting the global electrical System behavior (HV and MV networks) by adding more variability and introducing bidirectional power flow, potentially triggering new technical constraints (voltage rise or drop, thermal constraints in lines and transformers,…). Meanwhile, these changes also bring out new opportunities for players to offer flexibility services by managing a diverse portfolio of usages and equipments. Theses evolutions are politically driven at the French level by the "Energy Transition Law" and handled at the European level by the "Network Codes". In this context, French TSO and DSO (namely RTE and Enedis) are facing new specific constraints impacting voltage and reactive power transit, forcing them to launch coordination initiatives to strengthen their network operations at the various stages of networks life cycle (from network planning to network Operation and maintenance). This paper describes the specific initiatives rolled out since 2014 in the frame of Operation and Control coordination between RTE and Enedis in both Operational Planning and Real time. The ongoing studies scrutinize on one hand the operational planning detailed coordination needs and subsequent data exchanges starting at the works planning phase 2-1 years in advance continuing with anticipated operational constraints exchanges 1-2 months in advance (anticipated transit limitation on RTE networks side; or specific needs on Enedis side so as to allow generation power flow), pursuing with Work Access management (to adress common works security) and consequences, finishing with day-1 and intra-day necessary operational planning exchanges for anticipated network operation. This paper presents the status of ongoing studies in this frame and presents the different implementation orientations to date.
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