Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter

Jun Wang; Xibo Yuan; Bosen Jin; Ian Laird

doi:10.1109/IECON.2019.8927147

Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter

Jun Wang, Xibo Yuan, Bosen Jin, Ian Laird

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

6 Citations (Scopus)

192 Downloads (Pure)

Abstract

A four-level π-type converter is a Neutral Point Clamped (NPC) multilevel converter topology for low/medium voltage applications. As the inherent issue with this topology, the DC-link capacitor voltage balancing is challenging, especially when it operates as a single-end inverter/rectifier with unity power factor. This paper proposes a closed-loop DC-link voltage balancing algorithm of a π-type converter that is effective and simple to implement. In principle, this approach is based on Redundant Level Modulation (RLM). The RLM utilizes additional voltage levels in each switching window to gain extra controllability of the DC-link capacitor voltages without affecting the average output voltage. An algorithm based on mathematical and logical operations is developed to utilize RLM to achieve the closed-loop voltage balancing. The proposed control method is effective over the full modulation index ( $M=0\sim$ 1.15) and full power factor range $(cos\varphi=0\sim 1)$ . The algorithm is implemented in a test rig, and the experiment confirms its effectiveness.

Original language	English
Title of host publication	IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Number of pages	6
Volume	45
ISBN (Electronic)	978-1-7281-4878-6
ISBN (Print)	978-1-7281-4879-3
DOIs	https://doi.org/10.1109/IECON.2019.8927147
Publication status	Published - 9 Dec 2019
Event	Annual Conference of the IEEE Industrial Electronics Society - Duration: 14 Oct 2019 → 17 Oct 2019 https://iecon2019.org/

Publication series

Name	Proceedings of the Industrial Electronics Society Annual Conference
Publisher	IEEE
Volume	45
ISSN (Print)	1553-572X
ISSN (Electronic)	2577-1647

Conference

Conference	Annual Conference of the IEEE Industrial Electronics Society
Abbreviated title	IECON
Period	14/10/19 → 17/10/19
Internet address	https://iecon2019.org/

Keywords

multilevel converter
voltage balancing
level-shifted carrier
π-type

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10.1109/IECON.2019.8927147

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Wang, J., Yuan, X., Jin, B., & Laird, I. (2019). Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter. In IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society (Vol. 45). (Proceedings of the Industrial Electronics Society Annual Conference; Vol. 45). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/IECON.2019.8927147

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title = "Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter",

abstract = "A four-level π-type converter is a Neutral Point Clamped (NPC) multilevel converter topology for low/medium voltage applications. As the inherent issue with this topology, the DC-link capacitor voltage balancing is challenging, especially when it operates as a single-end inverter/rectifier with unity power factor. This paper proposes a closed-loop DC-link voltage balancing algorithm of a π-type converter that is effective and simple to implement. In principle, this approach is based on Redundant Level Modulation (RLM). The RLM utilizes additional voltage levels in each switching window to gain extra controllability of the DC-link capacitor voltages without affecting the average output voltage. An algorithm based on mathematical and logical operations is developed to utilize RLM to achieve the closed-loop voltage balancing. The proposed control method is effective over the full modulation index ( $M=0\sim$ 1.15) and full power factor range $(cos\varphi=0\sim 1)$ . The algorithm is implemented in a test rig, and the experiment confirms its effectiveness.",

keywords = "multilevel converter, voltage balancing, level-shifted carrier, π-type",

author = "Jun Wang and Xibo Yuan and Bosen Jin and Ian Laird",

year = "2019",

month = dec,

day = "9",

doi = "10.1109/IECON.2019.8927147",

language = "English",

isbn = "978-1-7281-4879-3",

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publisher = "Institute of Electrical and Electronics Engineers (IEEE)",

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address = "United States",

note = "Annual Conference of the IEEE Industrial Electronics Society, IECON ; Conference date: 14-10-2019 Through 17-10-2019",

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Wang, J , Yuan, X, Jin, B & Laird, I 2019, Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter. in IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. vol. 45, Proceedings of the Industrial Electronics Society Annual Conference, vol. 45, Institute of Electrical and Electronics Engineers (IEEE), Annual Conference of the IEEE Industrial Electronics Society, 14/10/19. https://doi.org/10.1109/IECON.2019.8927147

Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter. / Wang, Jun ; Yuan, Xibo; Jin, Bosen et al.
IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. Vol. 45 Institute of Electrical and Electronics Engineers (IEEE), 2019. (Proceedings of the Industrial Electronics Society Annual Conference; Vol. 45).

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

TY - GEN

T1 - Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter

AU - Wang, Jun

AU - Yuan, Xibo

AU - Jin, Bosen

AU - Laird, Ian

PY - 2019/12/9

Y1 - 2019/12/9

N2 - A four-level π-type converter is a Neutral Point Clamped (NPC) multilevel converter topology for low/medium voltage applications. As the inherent issue with this topology, the DC-link capacitor voltage balancing is challenging, especially when it operates as a single-end inverter/rectifier with unity power factor. This paper proposes a closed-loop DC-link voltage balancing algorithm of a π-type converter that is effective and simple to implement. In principle, this approach is based on Redundant Level Modulation (RLM). The RLM utilizes additional voltage levels in each switching window to gain extra controllability of the DC-link capacitor voltages without affecting the average output voltage. An algorithm based on mathematical and logical operations is developed to utilize RLM to achieve the closed-loop voltage balancing. The proposed control method is effective over the full modulation index ( $M=0\sim$ 1.15) and full power factor range $(cos\varphi=0\sim 1)$ . The algorithm is implemented in a test rig, and the experiment confirms its effectiveness.

AB - A four-level π-type converter is a Neutral Point Clamped (NPC) multilevel converter topology for low/medium voltage applications. As the inherent issue with this topology, the DC-link capacitor voltage balancing is challenging, especially when it operates as a single-end inverter/rectifier with unity power factor. This paper proposes a closed-loop DC-link voltage balancing algorithm of a π-type converter that is effective and simple to implement. In principle, this approach is based on Redundant Level Modulation (RLM). The RLM utilizes additional voltage levels in each switching window to gain extra controllability of the DC-link capacitor voltages without affecting the average output voltage. An algorithm based on mathematical and logical operations is developed to utilize RLM to achieve the closed-loop voltage balancing. The proposed control method is effective over the full modulation index ( $M=0\sim$ 1.15) and full power factor range $(cos\varphi=0\sim 1)$ . The algorithm is implemented in a test rig, and the experiment confirms its effectiveness.

KW - multilevel converter

KW - voltage balancing

KW - level-shifted carrier

KW - π-type

U2 - 10.1109/IECON.2019.8927147

DO - 10.1109/IECON.2019.8927147

M3 - Conference Contribution (Conference Proceeding)

SN - 978-1-7281-4879-3

VL - 45

T3 - Proceedings of the Industrial Electronics Society Annual Conference

BT - IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

PB - Institute of Electrical and Electronics Engineers (IEEE)

T2 - Annual Conference of the IEEE Industrial Electronics Society

Y2 - 14 October 2019 through 17 October 2019

ER -

Wang J , Yuan X, Jin B, Laird I. Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter. In IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. Vol. 45. Institute of Electrical and Electronics Engineers (IEEE). 2019. (Proceedings of the Industrial Electronics Society Annual Conference). doi: 10.1109/IECON.2019.8927147

Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter

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