Dynamic Modeling and Control of a Single-Phase Grid-Connected photovoltaic System

A Zare,M.T Iqbal

doi:10.24018/ejece.2020.4.6.266

Abstract

Designing control strategies to connect a photovoltaic (PV) system to the grid has been significantly challenging. This paper focuses on developing a controller for a single-phase PV system connected to the grid and its implementation to modify the power factor in the distribution power system. To design a grid-connected PV system, its components are modeled, such as PV panels, Maximum Power Point tracking (MPPT) algorithm, the grid interface inverter with the appropriate filter, and the DC link capacitor. SIMULINK / MATLAB is used for simulation in this study. The proposed control strategy is designed to track the maximum power point of The PV panels and control the PV active and reactive output power. In this paper, the presented reactive power control provides the PV system with power factor correction (PFC) capability. The proposed technique for checking controller validity is tested, and the results prove that the proposed controller is good and provides the required performance.

Highlights

Fossil fuels significantly satisfy global energy demand and are likely to keep their future impact
Employing Maximum Power Point tracking (MPPT) the PV array maximum available power is injected into the grid
The proposed controller responses to the different variation fast and is quietly stable when the transient period died out. It responds to the commands of power factor correction (PFC) in less than 1ms

Summary

INTRODUCTION

Fossil fuels significantly satisfy global energy demand and are likely to keep their future impact. Solar energy systems are one of the most widely utilized sources of RESs [1]. Another advantage of using solar energy is that in contrast with fossil fuel power plants, the sun's energy has no adverse impact on the environment [2], [3]. The most common MPPT techniques are Perturb & Observe and Incremental Conductance algorithms because they are simple and highly effective [5] Since these techniques are autonomous of photovoltaic characteristics while tracking the Maximum Power Point (MPP), they are the most advantageous techniques. While in some of their research, inverters are suggested to control only the injected P to the grid. An effective controller is obtained to directly control the P and Q of the grid-tied PV system

GRID-CONNECTED ROOFTOP PV SYSTEM

DC Link Capacitor and L Filter

The Inverter Controller Model

SIMULATION RESULTS

CONCLUSION