Large signal stability criterion of AC–DC hybrid microgrids with constant power loads considering reference current limitation

Liu, Xinbo; Li, Zongyang; Song, Xiaotong; Zhou, Jinghua; Qu, Yingming

doi:10.1049/gtd2.12623

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…MGs are generally categorized into AC, DC, and hybrid configurations, capable of operating either in grid-connected mode or as standalone MGs [9][10][11]. However, the DC type tends to be more appealing due to several advantages over other types.…”

Section: Motivationmentioning

confidence: 99%

Accurate voltage regulation for a DC microgrid using nonlinear state feedback controller

Arabshahi,

Saeidinia,

Torkaman

2023

IET Generation Trans & Dist

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The high penetration of distributed generation systems poses challenges in effectively managing both DC bus voltage and power‐sharing in DC microgrids (MGs). To ensure precise voltage regulation across various distributed generation systems and maintain overall system stability, this paper studies the modelling and control of an islanded DC MG described by a set of nonlinear‐nonaffine differential equations. In the proposed DC MG, a battery storage, a photovoltaic (PV) power plant, and a back‐end power converter with DC loads have been connected to a common DC bus. First, a dynamic model of a DC MG was developed. Then, to find the maximum power point of solar PV, a straightforward method based on an artificial neural net is employed. Afterward, a nonlinear local state feedback controller through output regulation theory is applied to achieve voltage stability, overcoming the drawbacks of droop‐based techniques. Moreover, partial state feedback capability simplifies controller design. To verify the effectiveness of the proposed approach, various scenarios, including sudden load variation, illumination change, and changes in the MG configuration, have been examined. Finally, numerical studies were carried out in a simulation environment to demonstrate the superiority of the proposed nonlinear control scheme over constant feedback control.

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Section: Motivationmentioning

confidence: 99%

Accurate voltage regulation for a DC microgrid using nonlinear state feedback controller

Arabshahi,

Saeidinia,

Torkaman

2023

IET Generation Trans & Dist

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show abstract

“…Particularly, the Brayton-Moser mixed potential function method is generally adopted to analyze the high-signal stability of microgrids. For AC/DC hybrid microgrids, reference [32] derived and optimized a unified stability criterion while considering the battery operation mode and the converter output current limitation based on the mixed potential function. References [33,34] present an absolute stability condition and a region of asymptotic stability of DC microgrids using the mixed potential function.…”

Section: Introductionmentioning

confidence: 99%

Large Signal Stability Analysis of Hybrid AC/DC Microgrids When a Single-Phase-to-Ground Fault Occurs

Liu,

Zhang,

Song

et al. 2024

Electronics

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Islanded hybrid AC/DC microgrids lack support for a large grid, and the negative incremental impedance of constant power loads (CPLs) aggravates the poor anti-disturbance capability of the system. When a single-phase ground fault (SPGF) occurs, the amount of fault impulse power that islanded AC/DC hybrid microgrids can stably withstand and when the protection equipment can work are both unknown. In this paper, the method of symmetrical components is utilized, and high-signal stability criteria for islanded hybrid AC/DC microgrids when a SPGF occurs are derived based on the mixed potential theory. The proposed criteria place quantitative constraints on the power of the PV unit, DC/AC converter current inner-loop proportional parameters, inductors, and inductor equivalent resistance, as well as energy storage unit power, CPL power, capacitors, DC bus voltage, line equivalent resistance, line equivalent inductance, equivalent inductance in the faulty branch, equivalent resistance in the faulty branch, positive-sequence equivalent impulse power of the SPGF, and zero-sequence equivalent impulse power. Furthermore, the maximum impulse power of a SPGF that islanded hybrid AC/DC microgrids could stably withstand is also presented, providing guidelines for protection equipment to decide when to work. In addition, the allowable maximum CPL power that islanded hybrid AC/DC microgrids could steadily support as a SPGF occurs is deduced, and the power is usually adopted to determine the states of an energy storage unit and load shedding in advance. Simulation and experimental validations prove the correctness of the derived high-signal stability criteria.

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Large disturbance stability analysis method for DC microgrid with virtual DC motor control

Zhao,

Liu,

et al. 2024

IET Renewable Power Gen

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Mixed potential theory is frequently employed for analysing large‐disturbance stability. The precision of the current stability criterion for DC microgrids controlled by virtual DC motors (VDCM), which relies on mixed potential theory, is inadequate. This is primarily because the criterion does not account for the control parameters of the DC bus voltage control link and the virtual DC motor link. To address these issues, the paper initially formulates the control aspect of the VDCM using a controlled current source. Subsequently, it derives the system's mixed potential function from the model, enabling the development of a stability criterion that includes the control parameters of the DC bus voltage control link, the virtual DC motor link, and the current tracking link. It also clarifies how parameters not directly included in the criterion affect system stability. Through simulations and experimental validations, it is demonstrated that the proposed stability criterion effectively captures the impact of control parameters on system stability and precisely delineates the system's power stability boundary, offering insights for system parameter optimization.

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Large signal stability criterion of AC–DC hybrid microgrids with constant power loads considering reference current limitation

Cited by 3 publications

References 29 publications

Accurate voltage regulation for a DC microgrid using nonlinear state feedback controller

Accurate voltage regulation for a DC microgrid using nonlinear state feedback controller

Large Signal Stability Analysis of Hybrid AC/DC Microgrids When a Single-Phase-to-Ground Fault Occurs

Large disturbance stability analysis method for DC microgrid with virtual DC motor control

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