Low-Voltage-Ride-Through control of a modular multilevel SDBC inverter for utility-Scale photovoltaic systems

Paul Sochor; Hirofumi Akagi; Nadia M.L. Tan

doi:10.1109/ECCE.2017.8096826

Low-Voltage-Ride-Through control of a modular multilevel SDBC inverter for utility-Scale photovoltaic systems

Paul Sochor
, Hirofumi Akagi
, Nadia M.L. Tan

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

8 Citations (Scopus)

Abstract

This paper presents theoretical and experimental discussions on low-voltage-ride-through (LVRT) operation of a modular multilevel single-delta bridge-cell (SDBC) inverter intended for utility-scale photovoltaic (PV) systems. As the penetration of distributed generation from renewable energy sources connected to medium- and high-voltage grids increases, grid-tied inverters progressively need to abide to stricter grid codes, which demand measures to maintain reliability of the grid. The latest grid codes require inverters in generation systems to provide dynamic grid support in the event of grid faults by injection of a reactive current. This paper discusses two unique solutions for an SDBC inverter to enable dynamic grid support. One method is to inject a zero-sequence current through feedforward control within the inverter, and the other is by utilizing power from the distributed dc-dc converters. No negative-sequence current is injected into the grid in both cases. This paper also highlights the issue of voltage-sag transformation through delta-wye transformers and its effect on the LVRT capability of the SDBC inverter. Experimental results on a three-phase 12.6-kVA system prove that the SDBC inverter is capable of seamlessly operating through symmetric and asymmetric voltage sags.

Original language	English
Title of host publication	2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	4865-4872
Number of pages	8
ISBN (Electronic)	9781509029983
DOIs	https://doi.org/10.1109/ECCE.2017.8096826
Publication status	Published - 3 Nov 2017
Externally published	Yes
Event	9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 - Cincinnati, United States Duration: 1 Oct 2017 → 5 Oct 2017

Publication series

Name	2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
Volume	2017-January

Conference

Conference	9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017
Country/Territory	United States
City	Cincinnati
Period	1/10/17 → 5/10/17

UN SDGs

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

SDG 7 Affordable and Clean Energy

Free Keywords

Cascaded H-bridge inverter
Delta-configured
Low-voltage-ride-through
Photovoltaics

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering
Renewable Energy, Sustainability and the Environment
Control and Optimization

Access to Document

10.1109/ECCE.2017.8096826

Cite this

Sochor, P., Akagi, H., & Tan, N. M. L. (2017). Low-Voltage-Ride-Through control of a modular multilevel SDBC inverter for utility-Scale photovoltaic systems. In 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017 (pp. 4865-4872). Article 8096826 (2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017; Vol. 2017-January). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE.2017.8096826

@inproceedings{4db0165eba494e3e8c7fe8716a0cebbe,

title = "Low-Voltage-Ride-Through control of a modular multilevel SDBC inverter for utility-Scale photovoltaic systems",

abstract = "This paper presents theoretical and experimental discussions on low-voltage-ride-through (LVRT) operation of a modular multilevel single-delta bridge-cell (SDBC) inverter intended for utility-scale photovoltaic (PV) systems. As the penetration of distributed generation from renewable energy sources connected to medium- and high-voltage grids increases, grid-tied inverters progressively need to abide to stricter grid codes, which demand measures to maintain reliability of the grid. The latest grid codes require inverters in generation systems to provide dynamic grid support in the event of grid faults by injection of a reactive current. This paper discusses two unique solutions for an SDBC inverter to enable dynamic grid support. One method is to inject a zero-sequence current through feedforward control within the inverter, and the other is by utilizing power from the distributed dc-dc converters. No negative-sequence current is injected into the grid in both cases. This paper also highlights the issue of voltage-sag transformation through delta-wye transformers and its effect on the LVRT capability of the SDBC inverter. Experimental results on a three-phase 12.6-kVA system prove that the SDBC inverter is capable of seamlessly operating through symmetric and asymmetric voltage sags.",

keywords = "Cascaded H-bridge inverter, Delta-configured, Low-voltage-ride-through, Photovoltaics",

author = "Paul Sochor and Hirofumi Akagi and Tan, \{Nadia M.L.\}",

note = "Publisher Copyright: {\textcopyright} 2017 IEEE.; 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 ; Conference date: 01-10-2017 Through 05-10-2017",

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Sochor, P, Akagi, H & Tan, NML 2017, Low-Voltage-Ride-Through control of a modular multilevel SDBC inverter for utility-Scale photovoltaic systems. in 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017., 8096826, 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017, vol. 2017-January, Institute of Electrical and Electronics Engineers Inc., pp. 4865-4872, 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017, Cincinnati, United States, 1/10/17. https://doi.org/10.1109/ECCE.2017.8096826

Low-Voltage-Ride-Through control of a modular multilevel SDBC inverter for utility-Scale photovoltaic systems. / Sochor, Paul; Akagi, Hirofumi; Tan, Nadia M.L.
2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017. Institute of Electrical and Electronics Engineers Inc., 2017. p. 4865-4872 8096826 (2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017; Vol. 2017-January).

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

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T1 - Low-Voltage-Ride-Through control of a modular multilevel SDBC inverter for utility-Scale photovoltaic systems

AU - Sochor, Paul

AU - Akagi, Hirofumi

AU - Tan, Nadia M.L.

PY - 2017/11/3

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N2 - This paper presents theoretical and experimental discussions on low-voltage-ride-through (LVRT) operation of a modular multilevel single-delta bridge-cell (SDBC) inverter intended for utility-scale photovoltaic (PV) systems. As the penetration of distributed generation from renewable energy sources connected to medium- and high-voltage grids increases, grid-tied inverters progressively need to abide to stricter grid codes, which demand measures to maintain reliability of the grid. The latest grid codes require inverters in generation systems to provide dynamic grid support in the event of grid faults by injection of a reactive current. This paper discusses two unique solutions for an SDBC inverter to enable dynamic grid support. One method is to inject a zero-sequence current through feedforward control within the inverter, and the other is by utilizing power from the distributed dc-dc converters. No negative-sequence current is injected into the grid in both cases. This paper also highlights the issue of voltage-sag transformation through delta-wye transformers and its effect on the LVRT capability of the SDBC inverter. Experimental results on a three-phase 12.6-kVA system prove that the SDBC inverter is capable of seamlessly operating through symmetric and asymmetric voltage sags.

AB - This paper presents theoretical and experimental discussions on low-voltage-ride-through (LVRT) operation of a modular multilevel single-delta bridge-cell (SDBC) inverter intended for utility-scale photovoltaic (PV) systems. As the penetration of distributed generation from renewable energy sources connected to medium- and high-voltage grids increases, grid-tied inverters progressively need to abide to stricter grid codes, which demand measures to maintain reliability of the grid. The latest grid codes require inverters in generation systems to provide dynamic grid support in the event of grid faults by injection of a reactive current. This paper discusses two unique solutions for an SDBC inverter to enable dynamic grid support. One method is to inject a zero-sequence current through feedforward control within the inverter, and the other is by utilizing power from the distributed dc-dc converters. No negative-sequence current is injected into the grid in both cases. This paper also highlights the issue of voltage-sag transformation through delta-wye transformers and its effect on the LVRT capability of the SDBC inverter. Experimental results on a three-phase 12.6-kVA system prove that the SDBC inverter is capable of seamlessly operating through symmetric and asymmetric voltage sags.

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KW - Low-voltage-ride-through

KW - Photovoltaics

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AN - SCOPUS:85041486505

T3 - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017

SP - 4865

EP - 4872

BT - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017

Y2 - 1 October 2017 through 5 October 2017

ER -

Sochor P, Akagi H, Tan NML. Low-Voltage-Ride-Through control of a modular multilevel SDBC inverter for utility-Scale photovoltaic systems. In 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017. Institute of Electrical and Electronics Engineers Inc. 2017. p. 4865-4872. 8096826. (2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017). doi: 10.1109/ECCE.2017.8096826

Low-Voltage-Ride-Through control of a modular multilevel SDBC inverter for utility-Scale photovoltaic systems

Abstract

Publication series

Conference

UN SDGs

Free Keywords

ASJC Scopus subject areas

Access to Document

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