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MATLAB Implementation of PV System With Battery Storage Using Bidirectional DC DC Converter

MATLAB Implementation of PV System With Battery Storage Using Bidirectional DC DC Converter

Introduction

The implementation and simulation of a photovoltaic (PV) system integrated with battery storage using a bidirectional DC-DC converter is demonstrated. The presenter outlines the components of the system and their functions.

System Design Overview

  • The system features a solar panel rated at 1000 Watts connected through a bidirectional DC-DC converter to a 48V battery.

  • The design aims to maintain a DC voltage of around 20V using a control algorithm.

Operating Modes of the System

  • The system operates in three distinct modes:

    1. When the power from the PV is less than the load, and the battery is charging.

    2. When both the PV and battery supply power to meet the load demand.

    3. When the PV power exceeds the load, allowing the battery to charge.

Simulation Setup

  • The presenter explains the parameters for the PV panels and the simulation model created in MATLAB.

  • Key settings include the maximum voltage, initial state of charge for the battery, and the use of the Incremental Conductance Method to extract maximum power.

Power Flow Analysis

  • The simulation evaluates power flow under various conditions:

    • Initial Charging: The battery starts at a 50% charge and transitions to charging mode as power demands change.

    • Load Changes: As solar radiation fluctuates, the system adjusts power output, demonstrating effective charging and discharging of the battery.

    • Nighttime Simulation: In low radiation conditions, the battery discharges to supply the load when solar power is insufficient.

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