High-bandwidth Secondary Voltage and Frequency Control of VSC-based AC Microgrid

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Abstract

This paper proposes a novel secondary control strategy for the power-electronic-based ac microgrid. This approach restores the voltage and frequency deviations by utilizing only local variables with very high bandwidth. This is realized with a finite control set model predictive control technique that is adopted in the inner level of the primary control of voltage source converters. In the outer level of the primary control, droop control and virtual impedance loops are exploited to adjust the power sharing among different distributed generation (DGs). As inner control level operates with a very high bandwidth, need for filtering of the calculated active and reactive powers in the outer level of the primary control is insignificant. Therefore, the secondary control can be operated with a far superior bandwidth compared to the case when the conventional cascaded linear control is used. Merits of the proposed approach are investigated analytically with the help of the describing function methodology that allows the quasi-linear approximation of the inner control level. Finally, simulation and experimental results are presented.

Original languageEnglish
Article number8632749
JournalIEEE Transactions on Power Electronics
Volume34
Issue number11
Pages (from-to)11320 - 11331
Number of pages12
ISSN0885-8993
DOIs
Publication statusPublished - Nov 2019

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Bandwidth
Electric potential
Level control
Describing functions
Distributed power generation
Model predictive control
Power electronics
Reactive power

Keywords

  • Distributed secondary control
  • Model predictive control
  • Voltage source converter (VSC)
  • ac microgrid (MG)
  • voltage source converter (VSC)
  • distributed secondary control
  • AC microgrid (MG)
  • model predictive control (MPC)

Cite this

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title = "High-bandwidth Secondary Voltage and Frequency Control of VSC-based AC Microgrid",
abstract = "This paper proposes a novel secondary control strategy for the power-electronic-based ac microgrid. This approach restores the voltage and frequency deviations by utilizing only local variables with very high bandwidth. This is realized with a finite control set model predictive control technique that is adopted in the inner level of the primary control of voltage source converters. In the outer level of the primary control, droop control and virtual impedance loops are exploited to adjust the power sharing among different distributed generation (DGs). As inner control level operates with a very high bandwidth, need for filtering of the calculated active and reactive powers in the outer level of the primary control is insignificant. Therefore, the secondary control can be operated with a far superior bandwidth compared to the case when the conventional cascaded linear control is used. Merits of the proposed approach are investigated analytically with the help of the describing function methodology that allows the quasi-linear approximation of the inner control level. Finally, simulation and experimental results are presented.",
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High-bandwidth Secondary Voltage and Frequency Control of VSC-based AC Microgrid. / Heydari, Rasool; Dragicevic, Tomislav; Blaabjerg, Frede.

In: IEEE Transactions on Power Electronics, Vol. 34, No. 11, 8632749, 11.2019, p. 11320 - 11331.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - High-bandwidth Secondary Voltage and Frequency Control of VSC-based AC Microgrid

AU - Heydari, Rasool

AU - Dragicevic, Tomislav

AU - Blaabjerg, Frede

PY - 2019/11

Y1 - 2019/11

N2 - This paper proposes a novel secondary control strategy for the power-electronic-based ac microgrid. This approach restores the voltage and frequency deviations by utilizing only local variables with very high bandwidth. This is realized with a finite control set model predictive control technique that is adopted in the inner level of the primary control of voltage source converters. In the outer level of the primary control, droop control and virtual impedance loops are exploited to adjust the power sharing among different distributed generation (DGs). As inner control level operates with a very high bandwidth, need for filtering of the calculated active and reactive powers in the outer level of the primary control is insignificant. Therefore, the secondary control can be operated with a far superior bandwidth compared to the case when the conventional cascaded linear control is used. Merits of the proposed approach are investigated analytically with the help of the describing function methodology that allows the quasi-linear approximation of the inner control level. Finally, simulation and experimental results are presented.

AB - This paper proposes a novel secondary control strategy for the power-electronic-based ac microgrid. This approach restores the voltage and frequency deviations by utilizing only local variables with very high bandwidth. This is realized with a finite control set model predictive control technique that is adopted in the inner level of the primary control of voltage source converters. In the outer level of the primary control, droop control and virtual impedance loops are exploited to adjust the power sharing among different distributed generation (DGs). As inner control level operates with a very high bandwidth, need for filtering of the calculated active and reactive powers in the outer level of the primary control is insignificant. Therefore, the secondary control can be operated with a far superior bandwidth compared to the case when the conventional cascaded linear control is used. Merits of the proposed approach are investigated analytically with the help of the describing function methodology that allows the quasi-linear approximation of the inner control level. Finally, simulation and experimental results are presented.

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