In this paper, we propose a PV energy storage grid-connected system that operates on constant power. The focus of this study is on the core components of the system, namely the MPPT control strategy, three-phase voltage source PWM converter, and bidirectional DC/DC converter.
A novel power flow management algorithm is devised to ensure proper battery charging or discharging, and to harmonize power flows among loads and diverse energy sources. The problem of controlling a grid-connected solar energy conversion system with battery energy storage is addressed in this work.
Aiming to investigate the control strategy for photovoltaic energy storage based on constant power grid connection, this research makes the following main contributions: Through the implementation of diverse control strategies, a comprehensive system is established to ensure consistent power operation across different conditions.
16.4.3.1. Grid-connected control strategy of power conversion system A power conversion system (PCS) is the exchange hinge of the energy reserving element and grid interconnection, which is the physical foundation to support grid frequency/voltage. PCS is normally formed a by three-phase voltage-source inverter (VSI).
Finally, a simulation model is developed in MATLAB/Simulink for system analysis. The results demonstrate that the proposed method enables constant grid-connected power generation and constant voltage charging of the energy storage battery when the PV cell’s power generation exceeds that of the grid.
The collaboration between the PV cell and the power grid is essential for optimizing energy utilization. When the PV cell generates more energy than the grid requires, it not only supplies electricity to the grid but also charges the energy storage battery to prevent energy wastage.