Current Control of LCL-Filtered Grid-Connected VSC Using Model Predictive Control with Inherent Damping

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Abstract

The advancement on penetration of renewable energy sources in the power system is, in part, tied to the current control of grid-connected LCL-filtered voltage source converters. A challenge is current control with the addition of the LCL-filter resonance, which interacts with the digital converter-control switching action and creates the possibility for instability. In certain scenarios, active damping is needed to stabilize the system and ensure robust performance in steady-state and dynamic response. Another approach is detailed in this paper where a hybrid linear and nonlinear controller is implemented to ensure the dynamic current control performance. This is done by combining a linear outer-loop Proportional Resonant current controller with a nonlinear inner-loop Model Predictive voltage controller to replace the fixed switching-frequency Pulse Width Modulator. This allows for easy compensation of nonlinear effects, such as time delays and provides the controller with the ability to prioritize the dynamic performance during step changes. The details for implementing this control structure are provided, along with a discussion of the advantages, and guidelines for the design procedure of the hybrid control structure. Simulation results and experimental measurements are provided to illustrate the control performance and validate the proposed method. As a conclusion, the control method as a whole is discussed in relation to the presented work and further research options.
Original languageEnglish
Title of host publicationProceedings of 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)
Number of pages11
PublisherIEEE Press
Publication dateSep 2018
Pages1-11
Article number8515638
ISBN (Print)978-1-5386-4145-3
ISBN (Electronic)978-9-0758-1528-3
Publication statusPublished - Sep 2018
Event20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe) - Riga, Latvia
Duration: 17 Sep 201821 Sep 2018

Conference

Conference20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)
CountryLatvia
CityRiga
Period17/09/201821/09/2018

Fingerprint

Model predictive control
Electric current control
Damping
Controllers
Electric potential
Switching frequency
Modulators
Dynamic response
Time delay

Keywords

  • Model Predictive Control
  • grid-connected converter
  • voltage-source converter
  • nonlinear control
  • active damping

Cite this

Nørgaard, J. B., Taul, M. G., Dragicevic, T., & Blaabjerg, F. (2018). Current Control of LCL-Filtered Grid-Connected VSC Using Model Predictive Control with Inherent Damping. In Proceedings of 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe) (pp. 1-11). [8515638] IEEE Press.
Nørgaard, Jacob Bitsch ; Taul, Mads Graungaard ; Dragicevic, Tomislav ; Blaabjerg, Frede. / Current Control of LCL-Filtered Grid-Connected VSC Using Model Predictive Control with Inherent Damping. Proceedings of 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe). IEEE Press, 2018. pp. 1-11
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abstract = "The advancement on penetration of renewable energy sources in the power system is, in part, tied to the current control of grid-connected LCL-filtered voltage source converters. A challenge is current control with the addition of the LCL-filter resonance, which interacts with the digital converter-control switching action and creates the possibility for instability. In certain scenarios, active damping is needed to stabilize the system and ensure robust performance in steady-state and dynamic response. Another approach is detailed in this paper where a hybrid linear and nonlinear controller is implemented to ensure the dynamic current control performance. This is done by combining a linear outer-loop Proportional Resonant current controller with a nonlinear inner-loop Model Predictive voltage controller to replace the fixed switching-frequency Pulse Width Modulator. This allows for easy compensation of nonlinear effects, such as time delays and provides the controller with the ability to prioritize the dynamic performance during step changes. The details for implementing this control structure are provided, along with a discussion of the advantages, and guidelines for the design procedure of the hybrid control structure. Simulation results and experimental measurements are provided to illustrate the control performance and validate the proposed method. As a conclusion, the control method as a whole is discussed in relation to the presented work and further research options.",
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Nørgaard, JB, Taul, MG, Dragicevic, T & Blaabjerg, F 2018, Current Control of LCL-Filtered Grid-Connected VSC Using Model Predictive Control with Inherent Damping. in Proceedings of 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)., 8515638, IEEE Press, pp. 1-11, 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe), Riga, Latvia, 17/09/2018.

Current Control of LCL-Filtered Grid-Connected VSC Using Model Predictive Control with Inherent Damping. / Nørgaard, Jacob Bitsch; Taul, Mads Graungaard; Dragicevic, Tomislav; Blaabjerg, Frede.

Proceedings of 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe). IEEE Press, 2018. p. 1-11 8515638.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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AU - Blaabjerg, Frede

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AB - The advancement on penetration of renewable energy sources in the power system is, in part, tied to the current control of grid-connected LCL-filtered voltage source converters. A challenge is current control with the addition of the LCL-filter resonance, which interacts with the digital converter-control switching action and creates the possibility for instability. In certain scenarios, active damping is needed to stabilize the system and ensure robust performance in steady-state and dynamic response. Another approach is detailed in this paper where a hybrid linear and nonlinear controller is implemented to ensure the dynamic current control performance. This is done by combining a linear outer-loop Proportional Resonant current controller with a nonlinear inner-loop Model Predictive voltage controller to replace the fixed switching-frequency Pulse Width Modulator. This allows for easy compensation of nonlinear effects, such as time delays and provides the controller with the ability to prioritize the dynamic performance during step changes. The details for implementing this control structure are provided, along with a discussion of the advantages, and guidelines for the design procedure of the hybrid control structure. Simulation results and experimental measurements are provided to illustrate the control performance and validate the proposed method. As a conclusion, the control method as a whole is discussed in relation to the presented work and further research options.

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PB - IEEE Press

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Nørgaard JB, Taul MG, Dragicevic T, Blaabjerg F. Current Control of LCL-Filtered Grid-Connected VSC Using Model Predictive Control with Inherent Damping. In Proceedings of 2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe). IEEE Press. 2018. p. 1-11. 8515638