Large-Signal Stability Analysis and Control for Small-Scale AC Microgrids With Single Storage

Xia, Yanghong; Lv, Zhonghua; Wei, Wei; He, Hanghang

doi:10.1109/jestpe.2021.3135892

Cited by 18 publications

(6 citation statements)

References 39 publications

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“…where C is the equivalent capacitance [22]. For the sake of simplification, this paper mainly addresses the transient stability problem with slow outer loop dynamic characteristics, thus ignoring the influence of the fast current inner loop and the line dynamics [17].…”

Section: System Transient Stability Analysis Based On Cfndmentioning

confidence: 99%

Transient Stability Analysis for a Multi-VSC Parallel System Based on the CFND Method

Li,

Xia,

et al. 2023

Energies

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Because of the control complexity of voltage source converters (VSCs), transient stability analysis of multi-VSC parallel systems is challenging, and there are still no effective methods to solve this problem. Inspired by the decoupling principle and combined with the normal form method, an innovative coupling-factor-based nonlinear decoupling (CFND) method is proposed. According to the coupling factors that can be used to evaluate the nonlinear coupling degree among different state variables, the CFND method approximately transforms a high-order nonlinear multi-VSC parallel system into multiple decoupled low-order modes. Thus, the transient stability of the original high-order multi-VSC system can be reflected indirectly by the mature inversing trajectory method and the phase plane method. The CFND method has universality, flexibility, and insensitivity to system order, and no need to construct corresponding Lyapunov functions for different nonlinear systems, breaking through the inherent limitations of traditional analysis methods. Furthermore, this paper derives a reduced-order large-signal model and the corresponding truncated model for a single VSC grid-connected system. The effectiveness of the reduced-order model is verified through simulation waveforms and ROAs partitioning. Subsequently, a generalized model of the multi-VSC grid-connected system is developed. Finally, taking the grid-connected system with three VSCs as an example, the proposed CFND method is used to analyze typical operation cases, and the conclusions of transient stability analysis are verified using the hardware-in-loop (HIL) experiments.

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Section: System Transient Stability Analysis Based On Cfndmentioning

confidence: 99%

Transient Stability Analysis for a Multi-VSC Parallel System Based on the CFND Method

Li,

Xia,

et al. 2023

Energies

Self Cite

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“…It designs a bidirectional buckboost DC-DC converter to improve the microgrid's stability in various wind and solar weather conditions. Xia et al (2022) discussed the large signal stability of the AC microgrid, which is a single energy storage-based AC microgrid, with the nonlinear reduced order model designed to determine system stability during large disturbances. Krismanto et al (2021) studied the stability issues in gridconnected microgrids during uncertain conditions in RES.…”

Section: Stability Issues In Microgridsmentioning

confidence: 99%

Technical advances and stability analysis in wind-penetrated power generation systems—A review

Yadav

Saravanan²

2022

Front. Energy Res.

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Recently, wind power from renewable energy power generation has been extended quickly to another level. To the grid, most renewable generators synchronize through the power electronic converters controlled flexibly. The high-level wind power penetration into the power generation system affects the dynamic performance of the power system and presents substantial uncertainties in system operation. This study mainly focuses on reviewing the various types of stability analyses in high-level wind penetration of power generation systems. It describes several challenges and simulation analyses related to stability issues. A comparative analysis has also been carried out for the various types of stability related to different research studies. The data show that transient stability has been significantly focused on in most of the studies.

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“…The contemporary electrical industry is undergoing a rapid shift from fossil energy resources to renewable ones [1][2][3], with the distribution network transforming from the single AC grid to various forms, including AC, DC, and hybrid AC/DC [4,5]. DC microgrids, with the increasing use of DC sources and loads, like storage batteries, electrical vehicles, variable frequency motors, and cost-effective photovoltaic (PV) sources [6][7][8], are emerging as a particularly promising technology.…”

Section: Introductionmentioning

confidence: 99%

Exploiting Photovoltaic Sources to Regulate Bus Voltage for DC Microgrids

Cai¹,

Li²,

Wang³

et al. 2023

Energies

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DC microgrids are highly compatible with photovoltaic (PV) generation because of their direct-current properties. However, with the increasing integration of PV sources into DC microgrids, traditional maximum power point tracking (MPPT) algorithms may cause problems such as overvoltage and power fluctuation, which makes it challenging to keep the stability of the DC-bus voltage due to the intermittent and stochastic nature of PVs. Consequently, in order to reduce the investment and maintenance costs of storage systems, innovative control methods are required for PVs to provide DC-bus voltage regulation services. In this paper, a novel active power control (APC) strategy, based on characteristic curve fitting, is proposed to flexibly regulate the PV output power. The transient process performance and robustness of the system are improved with the proposed APC strategy. Based on it, a V-P droop mechanism is designed to provide voltage regulating (DVR) service for the DC microgrid. The overall control strategy unifies the DVR function with the traditional MPPT function in the same control structure; thus, the PV source either works in the MPPT mode if the DC-bus is at its nominal value, or it works in the DVR mode if the DC-bus exceeds it. Switching between MPPT and DVR is autonomous, and it is fully decentralized, which improves the PV generation efficiency as well as ensures generation fairness among different parallel PV sources. Case studies including a real-world project analysis are carried out to validate the feasibility and effectiveness of the proposed strategy.

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Large-Signal Stability Analysis and Control for Small-Scale AC Microgrids With Single Storage

Cited by 18 publications

References 39 publications

Transient Stability Analysis for a Multi-VSC Parallel System Based on the CFND Method

Transient Stability Analysis for a Multi-VSC Parallel System Based on the CFND Method

Technical advances and stability analysis in wind-penetrated power generation systems—A review

Exploiting Photovoltaic Sources to Regulate Bus Voltage for DC Microgrids

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