# Grid-Connected Emergency Back-Up Power Supply

## TL;DR

This paper presents a detailed design and modeling of a grid-connected emergency back-up power system that switches seamlessly between grid and inverter power, ensuring reliable supply during outages.

## Contribution

It introduces a novel combined control scheme for a battery charger and inverter with simulation validation for emergency power applications.

## Key findings

- Simulation confirms system reliability and effective switching.
- The model accurately predicts system behavior during grid transitions.
- Proposed design enhances emergency power supply stability.

## Abstract

This paper documents a design and modelling of a grid-connected emergency back-up power supply for medium power applications. There are a rectifier-link boost derived battery charging circuit and a 4-switch push-pull power inverter circuit which are controlled by pulse width modulation (PWM) signals. This paper presents a state averaging model and Laplace domain transfer function of the charging circuit and a switching converter model of the power inverter circuit. A changeover relay based transfer switch controls the power flow towards the utility loads. During off-grid situations, loads are fed power by the proposed inverter circuit and during on-grid situations, battery is charged by an ac-link rectifier-fed boost converter. There is a relay switching circuit to control the charging phenomenon of the battery. The proposed design has been simulated in PLECS and the simulation results corroborate the reliability of the presented framework.