Control of solar system's battery voltage based on state of charge estimation (SOC)

One of the most prevalently used in renewable energies is solar energy. Solar sources are used in many applications such as mobile energy, home energy usage and so on. Solar systems can directly convert the solar radiation into electricity. This paper presents a low-cost and adaptive control strategies for lithium-ion battery as an energy storage of solar systems. For optimizing and actually safe operation of lithium-ion, battery voltage and also SOC are very essential values so to have a high-quality control system, the SOC of the battery should be estimated accurately by a low - error method for solar system's battery unit. A Thevenin model has been designed. The SOC estimation has received for logical accuracy. To get better accurateness and robustness of the SOC estimation and control strategy, we added a new method for identification of voltage and SOC graph nonlinear part. By the simulation result, it shows the excellent central role, and it can be applied by the software changes and unused programming to another similar system.