LVDC Microgrids for Power Sharing in Energy Community

In recent years the development of the LVDC distribution networks is under consideration. DC electrical distribution offers several advantages compared to AC in many applications, in particular in the presence of distributed generation and energy storage systems like high efficacy, flexibility and simple integrated to renewable sources. The DC distribution allows to integrate in a more efficient “microgrid” different sources with DC/DC converters. The paper proposes an innovative model of microgrid architecture for aggregations of users able to share the power produced by common generators and energy services called power sharing model (PSM) using a DC bus, called power sharing link (PSL), that connects the common generators to the users. Each user has also an independent AC connection point with the distributor and a power electronic converter as Open Unified Power Quality Conditioner (Open UPQC), so PSM can be easily implemented in special power sharing contracts compliant with national regulatory systems. The produced energy is shared by PSL to the users through unidirectional power electronic device. In this way the common generator is like a multiple generator without power exchange between users and each user remain passive towards the distributor. Only the balance node of the DC bus assumes a role of active user.