Energy recovery system with energy storage, method for operating an energy recovery system

摘要

Method for operating an energy recovery system, wherein the solar generator (3), in particular the solar generator (3) comprising one or more modules comprising solar cells, is connected to an inverter, in particular to its DC-side connection, wherein the inverter (2) is connected at its AC voltage side terminal to a consumer and / or AC mains, wherein the inverter (2) has an MPP tracker, wherein electrical energy is supplied to the inverter (2) from an energy store (4) via a power converter (5), that is to say DC / DC converters, wherein the voltage U_S applied to the inverter (2) is detected on the DC side and a target power P to be supplied by the power converter (5) to the DC-side connection of the inverter (2) in accordance with a characteristic P (U_S) which determines the dependence of the DC / DC converter provides power to the DC side of the voltage applied to the inverter is determined, the characteristic curve representing the dependence of the nominal power P of the power converter (5) on the voltage U_S applied to the DC side of the inverter (2), wherein the characteristic is variable by means of a primary control intervention, depending on factors such as market price (23), load forecast (24), memory (25), available, in the energy storage (4) stored amount of energy, local consumption (26), solar power (27), requirements (28) of the network operator or a higher-level control and / or weather forecast (29), wherein the sign of the characteristic curve is dependent on the operating mode, that is, on the removal of energy from the energy store (4) or on the supply of energy to the energy store (4), wherein the actual power delivered by the power converter (5) to the DC side terminal of the inverter (2) is determined, in particular by multiplying the voltage U_S applied to the DC side by the current supplied by the power converter (5) to the inverter (2), and off the difference between the desired power P and the actual power of the power converter (5) to be supplied to the inverter (2) is determined, in particular with other factors such as operating mode, behavior of the MPP tracker of the inverter (2) are taken into account wherein in unlit solar generator (3) and energy output of the energy store (4), the power-voltage characteristic P_S (U_S) has a single pronounced maximum at a voltage U_S, so that the MPP tracker finds this operating point.