Distributed Control of Photovoltaic-Energy Storage System for Low-Voltage Distribution Networks Considering the Consistency of Power and SOC

High-proportion integration of distributed photovoltaics presents new challenges to the safe and stable operation of distribution networks., among which the voltage violation and distribution substation overload problems are especially prominent. Therefore, it is critical to examine control methods for distribution networks with high levels of distributed photovoltaics. This paper proposes a distributed control approach for photovoltaic-energy storage (PV-ES) systems in low-voltage distribution networks that accounts for power and SOC consistency. The suggested approach leverages cooperative control among multiple PV-ES systems to mitigate voltage violations and transformer overloads while also taking into account the capacity differences among these systems. First, we propose a power management strategy that distributes power regulation commands to reduce transformer overloads in low-voltage distribution networks. Second, we construct a comprehensive consistency variable that considers both power and SOC of PV-ES systems and propose a distributed control approach for PV-ES systems based on this variable. Lastly, simulation calculations verify the effectiveness of our proposed method.