Energy Management Strategy for Grid-Tied Photovoltaic Systems with Integrated Hybrid Energy Storage

Abstract

Micro grids play a crucial role in facilitating the integration of renewable energy sources at the local level, fostering energy resilience and sustainability. Integrating RES, such as photovoltaic (PV) systems, can indeed introduce fluctuations and instability into the grid due to its intermittent nature. This paper presents an efficient energy management scheme for integrating renewable energy sources (RES) into the power grid, utilizing a hybrid configuration of battery and supercapacitor storage systems. By regulating the allocation of power among the battery, supercapacitor, and the utility grid according to the charging levels (SOC), a practical approach is provided to optimize the system's performance. This not only helps in mitigating PV power fluctuations but also ensures that the battery undergoes less strain by leveraging the supercapacitor to manage abrupt changes in power generation or load demand. The effectiveness of   proposed energy management schemes is validated by means of simulations, under various operating conditions. The results confirm that the implemented scheme has successfully maintained stable common DC bus voltage, ensured continuous bi-directional power supply, and achieved power balance across various operational modes. Moreover, the ability to maintain the charging levels (SOC) of the battery and supercapacitor within their specified thresholds illustrates efficient energy management and control.