Investigation of the accuracy of VFD analog output data and the energy performance of different voltage controls in a VFD-motor-belt-fan system

Gang Wang, Zhitao Han

Research output: Contribution to journalArticle

Abstract

Variable frequency drives (VFDs) are widely applied on induction motors to reduce electrical power by adjusting power frequency. Meanwhile VFDs also adjust power voltage based on different voltage controls, including a linear ratio, a squared ratio and a flux optimizer. Moreover, VFDs measure motor operating data, such as frequency, current, voltage and power, and provide them through their analog outputs. However, it is not clear whether the VFD analog output data are accurate and how the different voltage controls impact the drive system performance. The purpose of this paper is to investigate the accuracy of VFD analog output data and the energy performance of different voltage controls through an experiment conducted on a VFD-motor-belt-fan system. First the operating data provided by the VFD and measured by a power analyzer were compared, then the efficiencies of the motor-belt, VFD, and drive system among different voltage controls were measured and evaluated. The experiment results show that the VFD provides accurate frequency and current but inaccurate voltage and power. The squared ratio results in the highest drive system efficiency, 2–12% higher than the linear ratio and 0–2% higher than the flux optimizer, as the frequency varies from 35 to 20 Hz.

Original languageEnglish (US)
Pages (from-to)260-272
Number of pages13
JournalEnergy and Buildings
Volume194
DOIs
StatePublished - Jul 1 2019

Fingerprint

Voltage control
Fans
Electric potential
Fluxes
Induction motors
Experiments

Keywords

  • Energy efficiency
  • Fans
  • Induction motors
  • Variable frequency drives
  • Voltage control

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

@article{8da099d6f0244ee6a7d076be2f5a4e63,
title = "Investigation of the accuracy of VFD analog output data and the energy performance of different voltage controls in a VFD-motor-belt-fan system",
abstract = "Variable frequency drives (VFDs) are widely applied on induction motors to reduce electrical power by adjusting power frequency. Meanwhile VFDs also adjust power voltage based on different voltage controls, including a linear ratio, a squared ratio and a flux optimizer. Moreover, VFDs measure motor operating data, such as frequency, current, voltage and power, and provide them through their analog outputs. However, it is not clear whether the VFD analog output data are accurate and how the different voltage controls impact the drive system performance. The purpose of this paper is to investigate the accuracy of VFD analog output data and the energy performance of different voltage controls through an experiment conducted on a VFD-motor-belt-fan system. First the operating data provided by the VFD and measured by a power analyzer were compared, then the efficiencies of the motor-belt, VFD, and drive system among different voltage controls were measured and evaluated. The experiment results show that the VFD provides accurate frequency and current but inaccurate voltage and power. The squared ratio results in the highest drive system efficiency, 2–12{\%} higher than the linear ratio and 0–2{\%} higher than the flux optimizer, as the frequency varies from 35 to 20 Hz.",
keywords = "Energy efficiency, Fans, Induction motors, Variable frequency drives, Voltage control",
author = "Gang Wang and Zhitao Han",
year = "2019",
month = "7",
day = "1",
doi = "10.1016/j.enbuild.2019.04.008",
language = "English (US)",
volume = "194",
pages = "260--272",
journal = "Energy and Buildings",
issn = "0378-7788",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Investigation of the accuracy of VFD analog output data and the energy performance of different voltage controls in a VFD-motor-belt-fan system

AU - Wang, Gang

AU - Han, Zhitao

PY - 2019/7/1

Y1 - 2019/7/1

N2 - Variable frequency drives (VFDs) are widely applied on induction motors to reduce electrical power by adjusting power frequency. Meanwhile VFDs also adjust power voltage based on different voltage controls, including a linear ratio, a squared ratio and a flux optimizer. Moreover, VFDs measure motor operating data, such as frequency, current, voltage and power, and provide them through their analog outputs. However, it is not clear whether the VFD analog output data are accurate and how the different voltage controls impact the drive system performance. The purpose of this paper is to investigate the accuracy of VFD analog output data and the energy performance of different voltage controls through an experiment conducted on a VFD-motor-belt-fan system. First the operating data provided by the VFD and measured by a power analyzer were compared, then the efficiencies of the motor-belt, VFD, and drive system among different voltage controls were measured and evaluated. The experiment results show that the VFD provides accurate frequency and current but inaccurate voltage and power. The squared ratio results in the highest drive system efficiency, 2–12% higher than the linear ratio and 0–2% higher than the flux optimizer, as the frequency varies from 35 to 20 Hz.

AB - Variable frequency drives (VFDs) are widely applied on induction motors to reduce electrical power by adjusting power frequency. Meanwhile VFDs also adjust power voltage based on different voltage controls, including a linear ratio, a squared ratio and a flux optimizer. Moreover, VFDs measure motor operating data, such as frequency, current, voltage and power, and provide them through their analog outputs. However, it is not clear whether the VFD analog output data are accurate and how the different voltage controls impact the drive system performance. The purpose of this paper is to investigate the accuracy of VFD analog output data and the energy performance of different voltage controls through an experiment conducted on a VFD-motor-belt-fan system. First the operating data provided by the VFD and measured by a power analyzer were compared, then the efficiencies of the motor-belt, VFD, and drive system among different voltage controls were measured and evaluated. The experiment results show that the VFD provides accurate frequency and current but inaccurate voltage and power. The squared ratio results in the highest drive system efficiency, 2–12% higher than the linear ratio and 0–2% higher than the flux optimizer, as the frequency varies from 35 to 20 Hz.

KW - Energy efficiency

KW - Fans

KW - Induction motors

KW - Variable frequency drives

KW - Voltage control

UR - http://www.scopus.com/inward/record.url?scp=85064632832&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85064632832&partnerID=8YFLogxK

U2 - 10.1016/j.enbuild.2019.04.008

DO - 10.1016/j.enbuild.2019.04.008

M3 - Article

AN - SCOPUS:85064632832

VL - 194

SP - 260

EP - 272

JO - Energy and Buildings

JF - Energy and Buildings

SN - 0378-7788

ER -