Domain of Stability Characterization for Hybrid Microgrids Considering Different Power Sharing Conditions

Aderibole, Adedayo; Zeineldin, H. H.; Moursi, Mohamed Shawky El; Peng, Jimmy Chih-Hsien; Hosani, Mohamed Al

doi:10.1109/tec.2017.2743105

Cited by 41 publications

(21 citation statements)

References 22 publications

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“…The measured frequency of MG is ω P LL in Equations (28), (29). Moreover, the direction of line current is assumed arbitrarily, so while calculating bus voltages for two adjacent buses as in Equation (25) and Equation (26) the sign of last term for two buses will be positive and negative respectively.…”

Section: H Line Model In the Proposed Modelmentioning

confidence: 99%

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Virtual Impedances Optimization to Enhance Microgrid Small-Signal Stability and Reactive Power Sharing

et al. 2020

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Microgrid instability poses critical issues to the power delivery following a load change or a tripping event. In island operating mode lack of grid intensifies this challenge. This study aims at controlling several converter-based distributed generations (DG) sharing the power in an island microgrid (MG). At first, the microgrid model including virtual impedances and phase-locked loop (PLL) is introduced. Afterwards a novel small-signal stability analysis for island microgrids is proposed. Finally, an optimization algorithm based on particle swarm optimization (PSO) is proposed to design the virtual impedances. The optimization algorithm analyzes all possible operating points and aims at maximizing the microgrid stability index while keeping the reactive power mismatches at minimum level. The fractional objective function facilitates reaching at these objectives simultaneously. The proposed optimization algorithm is implemented in two separate case-studies and the corresponding virtual impedances are drawn in any microgrid. On the other hand, The voltage drops are checked as a condition in the optimization process. The results drawn from two separate case-studies verify that the proposed algorithm effectively maximizes the microgrid stability index and minimizes the reactive power mismatches.

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Section: H Line Model In the Proposed Modelmentioning

confidence: 99%

“…The power sharing effects on small-signal stability of a hybrid MG including low-inertia DGs and diesel generators was analyzed in [25]. By cascading lead compensators, a technique was proposed in [26] to enhance MG smallsignal stability.…”

Section: Introductionmentioning

confidence: 99%

Virtual Impedances Optimization to Enhance Microgrid Small-Signal Stability and Reactive Power Sharing

et al. 2020

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“…Although this approach basically distinguishes between a microgrid and distribution network, there are some confusing terms regarding microgrids in the literature. One of these is a hybrid microgrid, which is often used in literature to indicate a combination of different types of DGs (diesel, PV, wind and battery) [90][91][92][93]. However, this cannot be considered as a hybrid microgrid because a microgrid itself consists of these DGs by definitions.…”

Section: Definitions Of Microgridsmentioning

confidence: 99%

Evolution of Microgrids with Converter-Interfaced Generations: Challenges and Opportunities

Hossain¹,

Pota²,

Hossain³

et al. 2018

Preprint

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Although microgrids facilitate the increased penetration of distributed generations (DGs) and improve the security of power supplies, they have some issues that need to be better understood and addressed before realising the full potential of microgrids. This paper presents a comprehensive list of challenges and opportunities supported by a literature review on the evolution of converter-based microgrids. The discussion in this paper presented with a view to establishing microgrids as distinct from the existing distribution systems. This is accomplished by, firstly, describing the challenges and benefits of using DG units in a distribution network and then those of microgrid ones. Also, the definitions, classifications and characteristics of microgrids are revised according to their specific roles to provide a sound basis for novice researchers to undertake ongoing research on microgrids.

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“…Power electronic converters have been widely used in power systems for energy conversions between renewable energy sources and grid/loads [1], [2]. The voltage source converter (VSC) can deliver power in bidirectional way thanks to its control flexibility, and VSCs have been applied for bidirectional energy conversions in some instances, such as battery energy storage systems [3], double-fed wind generation systems [4], and hybrid ac-dc power systems [5]- [7] (known as interlinking converter in [5]), etc. However, the interactions among the converters' complicated control loops and passive components of the power systems possibly result in instability issues and thus impair the safe operation of these converters [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Stability Investigation of Bidirectional AC-DC Converter Considering Operating Conditions

Shuai

Liu

et al. 2020

IEEE Access

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This paper investigates the stability performances of bidirectional ac-dc converters considering operating conditions based on the small-signal impedance model. It finds that the converter has different stability margins when working in different operating conditions (including inverter mode and rectifier mode, as well as generating/absorbing reactive power), which should be taken into account in the design of the converter for bidirectional energy conversions. To have an intuitive understanding of the instability mechanisms of bidirectional converters in different operating conditions, the concept of positive feedback is used. It finds that with phase-lock loop (PLL) and dc-link voltage control loop (VCL), positive feedback effects appear when the converter operating in different conditions; and the influencing mechanisms of the parameters, including control parameters of PLL, inner current and outer voltage controllers and power ratings, on the converter's stability can be explicitly identified by the positive feedback gains. And it indicates that reducing the values of the parameters along the positive feedback paths will be a practical way to enhance the converter's stability. The theoretical stability analysis results are verified by simulations and experiments.

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Domain of Stability Characterization for Hybrid Microgrids Considering Different Power Sharing Conditions

Cited by 41 publications

References 22 publications

Virtual Impedances Optimization to Enhance Microgrid Small-Signal Stability and Reactive Power Sharing

Virtual Impedances Optimization to Enhance Microgrid Small-Signal Stability and Reactive Power Sharing

Evolution of Microgrids with Converter-Interfaced Generations: Challenges and Opportunities

Stability Investigation of Bidirectional AC-DC Converter Considering Operating Conditions

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