A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant

In this paper, a novel Power-Frequency Droop Control (PFDC) is introduced to perfectly bring back the system frequency and share the reactive power in isolated microgrid with virtual power plant (VPP). The frequency-based power delivery must be essentially implemented in VPP which can operate as a c...

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Main Authors: Amir Khanjanzadeh, Soodabeh Soleymani, Babak Mozafari
Format: Article
Language:English
Published: Polish Academy of Sciences 2021-02-01
Series:Bulletin of the Polish Academy of Sciences: Technical Sciences
Subjects:
Online Access:https://journals.pan.pl/Content/119079/PDF/03_01767_Bpast.No.69(1)_11.02.21_K1_A.pdf
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author Amir Khanjanzadeh
Soodabeh Soleymani
Babak Mozafari
author_facet Amir Khanjanzadeh
Soodabeh Soleymani
Babak Mozafari
author_sort Amir Khanjanzadeh
collection DOAJ
description In this paper, a novel Power-Frequency Droop Control (PFDC) is introduced to perfectly bring back the system frequency and share the reactive power in isolated microgrid with virtual power plant (VPP). The frequency-based power delivery must be essentially implemented in VPP which can operate as a conventional synchronous generator. It has been attained by enhancing the power processing unit of each VPP to operate as an active generator. The inverter coupling impedance which has been assigned by the virtual impedance technique has reduced the affected power coupling resulting from line resistance. The reference has been subsequently adjusted to compensate the frequency deviation caused by load variation and retrieve the VPP frequency to its nominal value. In addition, the line voltage drop has compensated the voltage drop and load sharing error to obliterate the reactive power sharing imprecision resulting from the voltage deviation. The voltage feedback confirms the correct voltage after compensating the voltage drop. As an illustration, conventional PFDC after a load change cannot restore the system frequency which is deviated from 50 Hz and rested in 49.9 Hz while, proposed PFDC strategy fades away the frequency deviation via compensating the variation of the frequency reference. Likewise, the frequency restoration factor ( γ) has an effective role in retrieving the system frequency, i.e., the restoration rate of the system frequency is in proportion with γ. As a whole, the simulation results have pointed to the high performance of proposed strategy in an isolated microgrid.
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spelling doaj.art-9711fd83ba9144a0a6f75755e586f96a2022-12-22T04:01:34ZengPolish Academy of SciencesBulletin of the Polish Academy of Sciences: Technical Sciences2300-19172021-02-0169No. 1https://doi.org/10.24425/bpasts.2021.136190A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plantAmir Khanjanzadeh0Soodabeh Soleymani1Babak Mozafari2Electrical and Computer Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, IranElectrical and Computer Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, IranElectrical and Computer Engineering Department, Science and Research Branch, Islamic Azad University, Tehran, IranIn this paper, a novel Power-Frequency Droop Control (PFDC) is introduced to perfectly bring back the system frequency and share the reactive power in isolated microgrid with virtual power plant (VPP). The frequency-based power delivery must be essentially implemented in VPP which can operate as a conventional synchronous generator. It has been attained by enhancing the power processing unit of each VPP to operate as an active generator. The inverter coupling impedance which has been assigned by the virtual impedance technique has reduced the affected power coupling resulting from line resistance. The reference has been subsequently adjusted to compensate the frequency deviation caused by load variation and retrieve the VPP frequency to its nominal value. In addition, the line voltage drop has compensated the voltage drop and load sharing error to obliterate the reactive power sharing imprecision resulting from the voltage deviation. The voltage feedback confirms the correct voltage after compensating the voltage drop. As an illustration, conventional PFDC after a load change cannot restore the system frequency which is deviated from 50 Hz and rested in 49.9 Hz while, proposed PFDC strategy fades away the frequency deviation via compensating the variation of the frequency reference. Likewise, the frequency restoration factor ( γ) has an effective role in retrieving the system frequency, i.e., the restoration rate of the system frequency is in proportion with γ. As a whole, the simulation results have pointed to the high performance of proposed strategy in an isolated microgrid.https://journals.pan.pl/Content/119079/PDF/03_01767_Bpast.No.69(1)_11.02.21_K1_A.pdfpfdcvppmicrogridvirtual impedancedecentralized control
spellingShingle Amir Khanjanzadeh
Soodabeh Soleymani
Babak Mozafari
A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
Bulletin of the Polish Academy of Sciences: Technical Sciences
pfdc
vpp
microgrid
virtual impedance
decentralized control
title A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
title_full A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
title_fullStr A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
title_full_unstemmed A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
title_short A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
title_sort decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
topic pfdc
vpp
microgrid
virtual impedance
decentralized control
url https://journals.pan.pl/Content/119079/PDF/03_01767_Bpast.No.69(1)_11.02.21_K1_A.pdf
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