A comparison between harmonic indices in low voltage grid-tied photovoltaic system

Mandla Mnisi; Pitshou Bokoro; Kitessa Roro; Lawrence Pratt; Manjunath Basappa Ayanna

doi:10.1109/AFRICON46755.2019.9133774

A comparison between harmonic indices in low voltage grid-tied photovoltaic system

Mandla Mnisi, Pitshou Bokoro, Kitessa Roro, Lawrence Pratt, Manjunath Basappa Ayanna

Electrical and Electronic Engineering Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Citation (Scopus)

Abstract

Power quality (PQ) of low voltage grid-tied rooftop PV system is regarded as an important step towards achieving the quality of supply. The deployment of a rooftop PV system is expected to increase in South Africa especially in urban areas. However, it is important for low voltage customer to install a PV system with low PQ disturbances. One of the most common PQ disturbance in power system is the distortion of current and voltage which is called harmonics. In this paper, the harmonics content is best presented as total harmonic distortion (THD) and total demand distortion (TDD). THD is the index of the most common harmonic that has been used by most of the literature. It has been observed that the measured THD is higher when the power consumed by the loads and solar irradiant is low. This could result in a situation whereby the low voltage customer with a PV system might be penalized by the utility. At higher solar irradiance and high-power consummation by loads the THD values of the grid is very low and is within the acceptable limits according to the standard. The PV system discussed in this study does not inject unwanted harmonics to the grid. The TDD result of the grid-tied PV system remains at a lower level regardless of whether the solar irradiance and the power consumed by the loads are lower or higher. The paper concludes that THD analysis can be misleading and TDD analysis are reliable and convincing. However, the study recommends the practice of TDD in PQ analysis.

Original language	English
Title of host publication	IEEE AFRICON 2019
Subtitle of host publication	Powering Africa's Sustainable Energy for All Agenda: The Role of ICT and Engineering, AFRICON 2019
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781728132891
DOIs	https://doi.org/10.1109/AFRICON46755.2019.9133774
Publication status	Published - Sept 2019
Event	2019 IEEE AFRICON, AFRICON 2019 - Accra, Ghana Duration: 25 Sept 2019 → 27 Sept 2019

Publication series

Name	IEEE AFRICON Conference
Volume	2019-September
ISSN (Print)	2153-0025
ISSN (Electronic)	2153-0033

Conference

Conference	2019 IEEE AFRICON, AFRICON 2019
Country/Territory	Ghana
City	Accra
Period	25/09/19 → 27/09/19

Keywords

Harmonics
IEEE519
NRS 097
Power quality
Solar Irradiance
TDD
THD

ASJC Scopus subject areas

Computer Science Applications
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1109/AFRICON46755.2019.9133774

Cite this

Mnisi, M., Bokoro, P., Roro, K., Pratt, L., & Ayanna, M. B. (2019). A comparison between harmonic indices in low voltage grid-tied photovoltaic system. In IEEE AFRICON 2019: Powering Africa's Sustainable Energy for All Agenda: The Role of ICT and Engineering, AFRICON 2019 Article 9133774 (IEEE AFRICON Conference; Vol. 2019-September). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/AFRICON46755.2019.9133774

@inproceedings{ca792519a54b41f690d125ec80c9cdf9,

title = "A comparison between harmonic indices in low voltage grid-tied photovoltaic system",

abstract = "Power quality (PQ) of low voltage grid-tied rooftop PV system is regarded as an important step towards achieving the quality of supply. The deployment of a rooftop PV system is expected to increase in South Africa especially in urban areas. However, it is important for low voltage customer to install a PV system with low PQ disturbances. One of the most common PQ disturbance in power system is the distortion of current and voltage which is called harmonics. In this paper, the harmonics content is best presented as total harmonic distortion (THD) and total demand distortion (TDD). THD is the index of the most common harmonic that has been used by most of the literature. It has been observed that the measured THD is higher when the power consumed by the loads and solar irradiant is low. This could result in a situation whereby the low voltage customer with a PV system might be penalized by the utility. At higher solar irradiance and high-power consummation by loads the THD values of the grid is very low and is within the acceptable limits according to the standard. The PV system discussed in this study does not inject unwanted harmonics to the grid. The TDD result of the grid-tied PV system remains at a lower level regardless of whether the solar irradiance and the power consumed by the loads are lower or higher. The paper concludes that THD analysis can be misleading and TDD analysis are reliable and convincing. However, the study recommends the practice of TDD in PQ analysis.",

keywords = "Harmonics, IEEE519, NRS 097, Power quality, Solar Irradiance, TDD, THD",

author = "Mandla Mnisi and Pitshou Bokoro and Kitessa Roro and Lawrence Pratt and Ayanna, {Manjunath Basappa}",

note = "Publisher Copyright: {\textcopyright} 2019 IEEE.; 2019 IEEE AFRICON, AFRICON 2019 ; Conference date: 25-09-2019 Through 27-09-2019",

year = "2019",

month = sep,

doi = "10.1109/AFRICON46755.2019.9133774",

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Mnisi, M, Bokoro, P, Roro, K, Pratt, L & Ayanna, MB 2019, A comparison between harmonic indices in low voltage grid-tied photovoltaic system. in IEEE AFRICON 2019: Powering Africa's Sustainable Energy for All Agenda: The Role of ICT and Engineering, AFRICON 2019., 9133774, IEEE AFRICON Conference, vol. 2019-September, Institute of Electrical and Electronics Engineers Inc., 2019 IEEE AFRICON, AFRICON 2019, Accra, Ghana, 25/09/19. https://doi.org/10.1109/AFRICON46755.2019.9133774

A comparison between harmonic indices in low voltage grid-tied photovoltaic system. / Mnisi, Mandla; Bokoro, Pitshou; Roro, Kitessa et al.
IEEE AFRICON 2019: Powering Africa's Sustainable Energy for All Agenda: The Role of ICT and Engineering, AFRICON 2019. Institute of Electrical and Electronics Engineers Inc., 2019. 9133774 (IEEE AFRICON Conference; Vol. 2019-September).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

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AU - Mnisi, Mandla

AU - Bokoro, Pitshou

AU - Roro, Kitessa

AU - Pratt, Lawrence

AU - Ayanna, Manjunath Basappa

PY - 2019/9

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N2 - Power quality (PQ) of low voltage grid-tied rooftop PV system is regarded as an important step towards achieving the quality of supply. The deployment of a rooftop PV system is expected to increase in South Africa especially in urban areas. However, it is important for low voltage customer to install a PV system with low PQ disturbances. One of the most common PQ disturbance in power system is the distortion of current and voltage which is called harmonics. In this paper, the harmonics content is best presented as total harmonic distortion (THD) and total demand distortion (TDD). THD is the index of the most common harmonic that has been used by most of the literature. It has been observed that the measured THD is higher when the power consumed by the loads and solar irradiant is low. This could result in a situation whereby the low voltage customer with a PV system might be penalized by the utility. At higher solar irradiance and high-power consummation by loads the THD values of the grid is very low and is within the acceptable limits according to the standard. The PV system discussed in this study does not inject unwanted harmonics to the grid. The TDD result of the grid-tied PV system remains at a lower level regardless of whether the solar irradiance and the power consumed by the loads are lower or higher. The paper concludes that THD analysis can be misleading and TDD analysis are reliable and convincing. However, the study recommends the practice of TDD in PQ analysis.

AB - Power quality (PQ) of low voltage grid-tied rooftop PV system is regarded as an important step towards achieving the quality of supply. The deployment of a rooftop PV system is expected to increase in South Africa especially in urban areas. However, it is important for low voltage customer to install a PV system with low PQ disturbances. One of the most common PQ disturbance in power system is the distortion of current and voltage which is called harmonics. In this paper, the harmonics content is best presented as total harmonic distortion (THD) and total demand distortion (TDD). THD is the index of the most common harmonic that has been used by most of the literature. It has been observed that the measured THD is higher when the power consumed by the loads and solar irradiant is low. This could result in a situation whereby the low voltage customer with a PV system might be penalized by the utility. At higher solar irradiance and high-power consummation by loads the THD values of the grid is very low and is within the acceptable limits according to the standard. The PV system discussed in this study does not inject unwanted harmonics to the grid. The TDD result of the grid-tied PV system remains at a lower level regardless of whether the solar irradiance and the power consumed by the loads are lower or higher. The paper concludes that THD analysis can be misleading and TDD analysis are reliable and convincing. However, the study recommends the practice of TDD in PQ analysis.

KW - Harmonics

KW - IEEE519

KW - NRS 097

KW - Power quality

KW - Solar Irradiance

KW - TDD

KW - THD

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DO - 10.1109/AFRICON46755.2019.9133774

M3 - Conference contribution

AN - SCOPUS:85088387594

T3 - IEEE AFRICON Conference

BT - IEEE AFRICON 2019

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 2019 IEEE AFRICON, AFRICON 2019

Y2 - 25 September 2019 through 27 September 2019

ER -

Mnisi M, Bokoro P, Roro K, Pratt L, Ayanna MB. A comparison between harmonic indices in low voltage grid-tied photovoltaic system. In IEEE AFRICON 2019: Powering Africa's Sustainable Energy for All Agenda: The Role of ICT and Engineering, AFRICON 2019. Institute of Electrical and Electronics Engineers Inc. 2019. 9133774. (IEEE AFRICON Conference). doi: 10.1109/AFRICON46755.2019.9133774

A comparison between harmonic indices in low voltage grid-tied photovoltaic system

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

UN SDGs

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