Control algorithms for photovoltaic inverters with battery-storage for increased self consumption

The aim of this paper is the development and analysis of control algorithms for internal energy management systems in interactive grid solar inverters with a battery storage system. Therefore, such a system consisting of multiple power electronic devices and a lead acid battery is described. Three different energy management algorithms are developed and simulated with different load and production data to gain results which allow to compare the features of the control algorithms. One of the main results are achievable self-consumption- rates which play an enormous role in the cost-effective operation of private photovoltaic (PV) power systems. The simulations were carried out in Math Works MATLAB for a time span of one year in one-second resolution. This allows a detailed analysis of the different algorithms. Special attention is paid on the time resolution of the power measurements where a significant dependency on the achievable self-consumption-rate has been found.