Power quality analysis of the grid-connected PV system using microinverter

Ngo Xuan Cuong Ngo Xuan Cuong,Do Nhu Y Do Nhu Y

doi:10.47577/technium.v1i.1

Ngo Xuan Cuong Ngo Xuan Cuong, Do Nhu Y Do Nhu Y

Open Access

https://doi.org/10.47577/technium.v1i.1

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Abstract

At present, small-scale grid-connected PV system is increasingly developed and used in many households. These small-scale PV system are often connected to grid using microinverter, because its advantages are low maintenance investment costs, ease of installation and operation and do not cause environmental pollution. The content of the article focuses on power quality analysis of the non-stored grid-connected PV system using microinverter. The research method in the paper is based on experiments on models and laboratory measurements. The analytical results will assess the power quality of grid-connected PV system using microinverter, thereby managers and operators to take measures to improve the power quality of the electrical system with grid-connected PV system. 

Highlights

At present, small-scale grid-connected PV system is increasingly developed and used in many households
The paper [3] analyzed the power quality of four PV systems using the Sunny Tripower 15000TL-10 string inverters, and concluded that many grid-connected PV systems have a significant impact to the distribution grid when the output power of the system is small
PV panels are fixed at an tilt angle equal to the latitude of the installation location [7][8], in this study, it is mounted on an support system with an tilt angle of 16 ° to the south

Summary

Introduction

Small-scale grid-connected PV system is increasingly developed and used in many households. PV system often classifies into: off grid PV system, on grid PV system, on grid PV system with battery backup. On grid PV system or grid-connected PV system without battery backup has the advantage of low maintenance investment costs, easy installation and operation, and does not cause environmental pollution because it is not necessary to use batteries to electricity store, so it is increasingly used. The structure of grid-connected PV system includes PV panel, grid-connected inverter to convert direct current from PV panels into alternating current with the same frequency and phase of grid. There are 3 types of technologies for grid-connected inverter including: string inverter (centralized inverter), microinverter (distributed inverter) and string inverter with optimal control circuit board for PV panel (Power Optimizer)

Power factor

Steady output efficiency

Conclusion