Lågspänt likströmsmikronät för effektivisering av solcellsanläggningar

Sammanfattning: The Swedish energy supply has gone from dispatchable energy sources to more intermittent energy. The conversion to renewable sources such as solar and wind power, also the increasing demand caused by electrification of cars creates increasing challenges on today's electricity grid. Today's electricity consumption is an increasing trend, which puts loads on the electricity grid as reducing consumption is one of several solutions.  From 1 January 2022, the ordinance (2007:215) on exemptions from the requirement for a network concession in accordance with the Electricity Act (1997:857) has been amended. Construction of an internal low-voltage grid for energy sharing, also called microgrids, has been permitted. This enables an internal low-voltage network, sharing of energy that is burred underground and not overhead may be built, also to be used without a network concession for private actors to build microgrids. This report looks at the interconnection of photovoltaic systems in a microgrid, which enables the sharing of electrical energy. The aim of the study is to see conditions that are advantageous in applying a microgrid. The survey has been compared in two scenarios. Scenario 1 has four buildings with individual photovoltaic systems. Scenario 2 have the same four buildings but only two photovoltaic systems installed, on houses one and four. Both scenarios are compared with the application of a microgrid. The buildings are based on the planned residential area for Eksta AB in Algusered, Kungsbacka. The study in Algusered shows an increase in self-use and self-sufficiency as well as a reduction in overproduction and CO2 emissions for all facilities. Scenario 2 reduces investment costs by reducing the total installed solar cells.