Dispatchable Virtual-oscillator-controlled Inverters with Current-limiting and MPPT Capabilities

Minghui Lu; Rahul Mallik; Brian Johnson; Sairaj Dhople

doi:10.1109/ECCE47101.2021.9595530

Dispatchable Virtual-oscillator-controlled Inverters with Current-limiting and MPPT Capabilities

Minghui Lu, Rahul Mallik, Brian Johnson, Sairaj Dhople

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

14 Scopus citations

Abstract

Photovoltaic (PV) inverters typically have a multiloop control architecture to facilitate extraction of maximum possible dc-side power and its transfer to an ac-side grid interconnection. In this paper, we integrate dc-side controls that modulate the dc-link voltage for peak PV power harvest with an ac-side dispatchable virtual oscillator controller (dVOC) that synchronizes to the grid. In particular, maximum power point tracking is realized via integral control which then generates a dc-link voltage command. From there, dc-side voltage regulation is achieved by modulating the power reference sent to the ac-side dVOC. The dVOC yields an ac voltage command which is tracked with nested voltage- and current-control loops in the synchronous reference frame. Ac-side functions are topped off with an ac-side current limiter to ensure proper operation during large grid transients. We then analyze the eigenvalues of this interconnected system and its participation factors to demonstrate timescale separation of the various control loops. The proposed framework is substantiated via simulations and experiments.

Original language	English (US)
Title of host publication	2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	3316-3323
Number of pages	8
ISBN (Electronic)	9781728151359
DOIs	https://doi.org/10.1109/ECCE47101.2021.9595530
State	Published - 2021
Externally published	Yes
Event	13th IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Virtual, Online, Canada Duration: Oct 10 2021 → Oct 14 2021

Publication series

Name	2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings

Conference

Conference	13th IEEE Energy Conversion Congress and Exposition, ECCE 2021
Country/Territory	Canada
City	Virtual, Online
Period	10/10/21 → 10/14/21

Bibliographical note

Funding Information:
Funding provided by the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Office grant number DE-EE0009025, the Washington Research Foundation, and the National Science Foundation through grant 1509277 is gratefully acknowledged. ∗ Minghui Lu and Rahul Mallik are co-first authors.

Publisher Copyright:
© 2021 IEEE.

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

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10.1109/ECCE47101.2021.9595530

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Lu, M., Mallik, R., Johnson, B., & Dhople, S. (2021). Dispatchable Virtual-oscillator-controlled Inverters with Current-limiting and MPPT Capabilities. In 2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings (pp. 3316-3323). (2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ECCE47101.2021.9595530

Dispatchable Virtual-oscillator-controlled Inverters with Current-limiting and MPPT Capabilities. / Lu, Minghui; Mallik, Rahul; Johnson, Brian et al.
2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2021. p. 3316-3323 (2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings).

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

Lu, M, Mallik, R, Johnson, B & Dhople, S 2021, Dispatchable Virtual-oscillator-controlled Inverters with Current-limiting and MPPT Capabilities. in 2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings. 2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings, Institute of Electrical and Electronics Engineers Inc., pp. 3316-3323, 13th IEEE Energy Conversion Congress and Exposition, ECCE 2021, Virtual, Online, Canada, 10/10/21. https://doi.org/10.1109/ECCE47101.2021.9595530

Lu M, Mallik R, Johnson B, Dhople S. Dispatchable Virtual-oscillator-controlled Inverters with Current-limiting and MPPT Capabilities. In 2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2021. p. 3316-3323. (2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings). doi: 10.1109/ECCE47101.2021.9595530

Lu, Minghui ; Mallik, Rahul ; Johnson, Brian et al. / Dispatchable Virtual-oscillator-controlled Inverters with Current-limiting and MPPT Capabilities. 2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2021. pp. 3316-3323 (2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings).

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AB - Photovoltaic (PV) inverters typically have a multiloop control architecture to facilitate extraction of maximum possible dc-side power and its transfer to an ac-side grid interconnection. In this paper, we integrate dc-side controls that modulate the dc-link voltage for peak PV power harvest with an ac-side dispatchable virtual oscillator controller (dVOC) that synchronizes to the grid. In particular, maximum power point tracking is realized via integral control which then generates a dc-link voltage command. From there, dc-side voltage regulation is achieved by modulating the power reference sent to the ac-side dVOC. The dVOC yields an ac voltage command which is tracked with nested voltage- and current-control loops in the synchronous reference frame. Ac-side functions are topped off with an ac-side current limiter to ensure proper operation during large grid transients. We then analyze the eigenvalues of this interconnected system and its participation factors to demonstrate timescale separation of the various control loops. The proposed framework is substantiated via simulations and experiments.

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Dispatchable Virtual-oscillator-controlled Inverters with Current-limiting and MPPT Capabilities

Abstract

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Bibliographical note

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