Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration

This paper presents small signal stability analysis of a hybrid microgrid from three different aspects. First, a generalized droop control of interlinking converter (ILC) is proposed which defines voltage and frequency droops at its terminals to achieve a bidirectional, autonomous power flow between...

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Main Authors: Sarmad Majeed Malik, Yingyun Sun, Xin Ai, Zhengqi Chen, Kunyu Wang
Format: Article
Language:English
Published: IEEE 2019-01-01
Series:IEEE Access
Subjects:
Online Access:https://ieeexplore.ieee.org/document/8811495/
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spelling doaj-7ef4774873074f568c66420fa373c1002021-03-30T00:02:38ZengIEEEIEEE Access2169-35362019-01-01711963111964310.1109/ACCESS.2019.29371238811495Small-Signal Analysis of a Hybrid Microgrid With High PV PenetrationSarmad Majeed Malik0Yingyun Sun1https://orcid.org/0000-0002-7516-753XXin Ai2Zhengqi Chen3Kunyu Wang4Department of Electrical Engineering, North China Electric Power University (NCEPU), Beijing, ChinaDepartment of Electrical Engineering, North China Electric Power University (NCEPU), Beijing, ChinaDepartment of Electrical Engineering, North China Electric Power University (NCEPU), Beijing, ChinaDepartment of Electrical Engineering, North China Electric Power University (NCEPU), Beijing, ChinaDepartment of Electrical Engineering, North China Electric Power University (NCEPU), Beijing, ChinaThis paper presents small signal stability analysis of a hybrid microgrid from three different aspects. First, a generalized droop control of interlinking converter (ILC) is proposed which defines voltage and frequency droops at its terminals to achieve a bidirectional, autonomous power flow between grids. The impact of the droop gains on the stability is discussed and an operational range is defined for a stable system operation. Second, contrary to previous literature which have modeled the ac and dc grids by ideal sources and converters, the ac grid in this scheme is represented as a second-order synchronous generator and the dc grid is modeled as a PV system so as to analyze the dc grid dynamics in detail. It is observed that the dc link capacitor and inductor filter can lead to large system oscillations which can compromise stability. Third, the stability of the hybrid grid is analyzed from the aspect of short circuit ratio (SCR). Both rectifier and inverter mode of operation are used to understand how stability is affected with strength of ac grid. The time-domain simulations in PSCAD are used to confirm the validity of results obtained in frequency domain.https://ieeexplore.ieee.org/document/8811495/Hybrid microgrideigenvalue analysissmall signal modeldroopphase-locked loop (PLL)
collection DOAJ
language English
format Article
sources DOAJ
author Sarmad Majeed Malik
Yingyun Sun
Xin Ai
Zhengqi Chen
Kunyu Wang
spellingShingle Sarmad Majeed Malik
Yingyun Sun
Xin Ai
Zhengqi Chen
Kunyu Wang
Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration
IEEE Access
Hybrid microgrid
eigenvalue analysis
small signal model
droop
phase-locked loop (PLL)
author_facet Sarmad Majeed Malik
Yingyun Sun
Xin Ai
Zhengqi Chen
Kunyu Wang
author_sort Sarmad Majeed Malik
title Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration
title_short Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration
title_full Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration
title_fullStr Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration
title_full_unstemmed Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration
title_sort small-signal analysis of a hybrid microgrid with high pv penetration
publisher IEEE
series IEEE Access
issn 2169-3536
publishDate 2019-01-01
description This paper presents small signal stability analysis of a hybrid microgrid from three different aspects. First, a generalized droop control of interlinking converter (ILC) is proposed which defines voltage and frequency droops at its terminals to achieve a bidirectional, autonomous power flow between grids. The impact of the droop gains on the stability is discussed and an operational range is defined for a stable system operation. Second, contrary to previous literature which have modeled the ac and dc grids by ideal sources and converters, the ac grid in this scheme is represented as a second-order synchronous generator and the dc grid is modeled as a PV system so as to analyze the dc grid dynamics in detail. It is observed that the dc link capacitor and inductor filter can lead to large system oscillations which can compromise stability. Third, the stability of the hybrid grid is analyzed from the aspect of short circuit ratio (SCR). Both rectifier and inverter mode of operation are used to understand how stability is affected with strength of ac grid. The time-domain simulations in PSCAD are used to confirm the validity of results obtained in frequency domain.
topic Hybrid microgrid
eigenvalue analysis
small signal model
droop
phase-locked loop (PLL)
url https://ieeexplore.ieee.org/document/8811495/
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AT xinai smallsignalanalysisofahybridmicrogridwithhighpvpenetration
AT zhengqichen smallsignalanalysisofahybridmicrogridwithhighpvpenetration
AT kunyuwang smallsignalanalysisofahybridmicrogridwithhighpvpenetration
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