Power distribution technique and small-signal modeling of grid-integrated solar PV system with hybrid energy storage systems

A model of a grid-integrated AC/DC microgrid with the assimilation of renewable energy resources and supercapacitors with battery storage-based hybrid energy storage is considered in this paper. The insertion of renewable resources and energy storage devices in the existing power grid requires rigorous analysis of the power balance and system stability. The microgrid is designed to absorb/deliver the defined power from/to the utility grid in a bidirectional manner. To simplify the power control strategy, the total power requirement in the system is divided into slow and fast varying components. So, the grid and battery will share the slowly varying components and the supercapacitor will suppress the fast varying components. This control strategy ensures improved performance by retaining the unity power factor operation of the grid, faster DC link voltage recovery, and harmonic mitigation. Again, a double-loop control structure based on small-signal modeling of the system is presented for stability analysis of the proposed system. MATLAB/Simulink results along with real-time simulation results are provided in this paper for verification of the proposed control technique.

Automated summary

This paper considers a model of a grid-integrated AC/DC microgrid with the assimilation of renewable energy resources and supercapacitors with battery storage-based hybrid energy storage. The insertion of renewable resources and energy storage devices in the existing power grid requires analysis of power balance and system stability. The microgrid is designed for bidirectional power flow with a simplified control strategy dividing power requirement into slow and fast varying components.