Utility scale interface for renewables and storage using a power electronic transformer with back-to-back MMCs: A novel control scheme

Vishnu Narayan Vipin; Abhijith Kshirsagar; Daniel Opila; Ned Mohan

doi:10.1109/NAPS.2017.8107334

Utility scale interface for renewables and storage using a power electronic transformer with back-to-back MMCs: A novel control scheme

Vishnu Narayan Vipin, Abhijith Kshirsagar, Daniel Opila, Ned Mohan

Electrical and Computer Engineering

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

8 Scopus citations

Abstract

The utility-scale renewables, PV and wind, are already approaching grid parity. To further enhance their penetration rapidly requires additional cost reduction and increased efficiency. There are other applications in utility-scale energy storage systems and in substations with power ratings in MW range for rapid charging of multiple electric vehicles. Towards this goal, one approach to interface with grid voltages of up to 34.5 kV is to use Power Electronic Transformers (PETs) consisting of back-to-back MMCs (Modular Multilevel Converters) and a high-frequency transformer. The control in such systems is challenging because of the lack of significant energy storage in the dc link between the two MMCs, unlike those in applications such as HVDC transmission and medium-voltage motor drives. Constraints on the modulation scheme under such conditions are pointed out and a novel control scheme is proposed in this paper that results in a ripple-free voltage dc link voltage, but controllable, between the two MMCs, reduced ripple in the capacitor voltages in each MMC module, and low THD in the ac currents at the terminals of the MMCs. Using this control scheme, the operation at controllable power factor and under unbalanced grid conditions is investigated and the simulation results are presented.

Original language	English (US)
Title of host publication	2017 North American Power Symposium, NAPS 2017
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781538626993
DOIs	https://doi.org/10.1109/NAPS.2017.8107334
State	Published - Nov 13 2017
Event	2017 North American Power Symposium, NAPS 2017 - Morgantown, United States Duration: Sep 17 2017 → Sep 19 2017

Publication series

Name	2017 North American Power Symposium, NAPS 2017

Other

Other	2017 North American Power Symposium, NAPS 2017
Country/Territory	United States
City	Morgantown
Period	9/17/17 → 9/19/17

Bibliographical note

Publisher Copyright:
© 2017 IEEE.

Keywords

Back-to-Back MMCs
Grid Integration
Power Electronic Transformer
Virtual DC link
constraints on the modulating signal
modified carrier phase shifts

UN SDGs

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

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10.1109/NAPS.2017.8107334

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Vipin, V. N., Kshirsagar, A., Opila, D., & Mohan, N. (2017). Utility scale interface for renewables and storage using a power electronic transformer with back-to-back MMCs: A novel control scheme. In 2017 North American Power Symposium, NAPS 2017 Article 8107334 (2017 North American Power Symposium, NAPS 2017). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/NAPS.2017.8107334

Utility scale interface for renewables and storage using a power electronic transformer with back-to-back MMCs: A novel control scheme. / Vipin, Vishnu Narayan; Kshirsagar, Abhijith; Opila, Daniel et al.
2017 North American Power Symposium, NAPS 2017. Institute of Electrical and Electronics Engineers Inc., 2017. 8107334 (2017 North American Power Symposium, NAPS 2017).

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

Vipin, VN, Kshirsagar, A, Opila, D & Mohan, N 2017, Utility scale interface for renewables and storage using a power electronic transformer with back-to-back MMCs: A novel control scheme. in 2017 North American Power Symposium, NAPS 2017., 8107334, 2017 North American Power Symposium, NAPS 2017, Institute of Electrical and Electronics Engineers Inc., 2017 North American Power Symposium, NAPS 2017, Morgantown, United States, 9/17/17. https://doi.org/10.1109/NAPS.2017.8107334

Vipin VN, Kshirsagar A, Opila D, Mohan N. Utility scale interface for renewables and storage using a power electronic transformer with back-to-back MMCs: A novel control scheme. In 2017 North American Power Symposium, NAPS 2017. Institute of Electrical and Electronics Engineers Inc. 2017. 8107334. (2017 North American Power Symposium, NAPS 2017). doi: 10.1109/NAPS.2017.8107334

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abstract = "The utility-scale renewables, PV and wind, are already approaching grid parity. To further enhance their penetration rapidly requires additional cost reduction and increased efficiency. There are other applications in utility-scale energy storage systems and in substations with power ratings in MW range for rapid charging of multiple electric vehicles. Towards this goal, one approach to interface with grid voltages of up to 34.5 kV is to use Power Electronic Transformers (PETs) consisting of back-to-back MMCs (Modular Multilevel Converters) and a high-frequency transformer. The control in such systems is challenging because of the lack of significant energy storage in the dc link between the two MMCs, unlike those in applications such as HVDC transmission and medium-voltage motor drives. Constraints on the modulation scheme under such conditions are pointed out and a novel control scheme is proposed in this paper that results in a ripple-free voltage dc link voltage, but controllable, between the two MMCs, reduced ripple in the capacitor voltages in each MMC module, and low THD in the ac currents at the terminals of the MMCs. Using this control scheme, the operation at controllable power factor and under unbalanced grid conditions is investigated and the simulation results are presented.",

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AB - The utility-scale renewables, PV and wind, are already approaching grid parity. To further enhance their penetration rapidly requires additional cost reduction and increased efficiency. There are other applications in utility-scale energy storage systems and in substations with power ratings in MW range for rapid charging of multiple electric vehicles. Towards this goal, one approach to interface with grid voltages of up to 34.5 kV is to use Power Electronic Transformers (PETs) consisting of back-to-back MMCs (Modular Multilevel Converters) and a high-frequency transformer. The control in such systems is challenging because of the lack of significant energy storage in the dc link between the two MMCs, unlike those in applications such as HVDC transmission and medium-voltage motor drives. Constraints on the modulation scheme under such conditions are pointed out and a novel control scheme is proposed in this paper that results in a ripple-free voltage dc link voltage, but controllable, between the two MMCs, reduced ripple in the capacitor voltages in each MMC module, and low THD in the ac currents at the terminals of the MMCs. Using this control scheme, the operation at controllable power factor and under unbalanced grid conditions is investigated and the simulation results are presented.

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Utility scale interface for renewables and storage using a power electronic transformer with back-to-back MMCs: A novel control scheme

Abstract

Publication series

Other

Bibliographical note

Keywords

UN SDGs

Publisher link

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