A Fault Detection Scheme for Islanded-Microgrid with Grid-Forming Inverters

Zarei, Seyed Fariborz; Ghasemi, Mohamad Amin; Peyghami, Saeed; Blaabjerg, Frede

doi:10.1109/egrid52793.2021.9662140

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…Table 4 compares our proposed method with similar fault detection techniques for inverters operating in islanded AC microgrids. The comparison aims to assess the efficacy and limitations of the techniques presented in [36] and [37]. The authors in [36] develop a model-and observer-based fault detection strategy with an adaptive threshold to protect inverters.…”

Section: B Comparison With Similar Detection Techniquesmentioning

confidence: 99%

“…Also, the adaptive threshold shows low sensitivity to faults, causing missed and false detections. In [37], the authors develop a signal-based strategy that superimposes current components and combines them with a voltage restraint quantity. Even though the method can capture the presence of faults, it introduces a windowing strategy to compute the restraint threshold, delaying the detection of the fault.…”

Section: B Comparison With Similar Detection Techniquesmentioning

confidence: 99%

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Adaptive Fault Detection for Grid-Forming Inverters

Intriago,

Zhang

2024

IEEE Access

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This work introduces a residual-based adaptive threshold for detecting faults in grid-forming inverters in AC microgrids islanded from the main grid. The inverters are modeled as a nonlinear system with one-sided Lipschitz nonlinearities and modeling uncertainties. The adaptive threshold response is evaluated using unwanted events such as busbar and sensor faults. An inequality for the upper bound on the ℓ 2 norm of the residual is derived and used for designing the adaptive threshold. The upper bound is obtained via semidefinite programming with two linear matrix inequality constraints. In the numerical tests, we consider an islanded-mode AC microgrid with two grid-forming inverters, one grid-following inverter, and one synchronous machine with the governor and excitation control. Primary and secondary control layers regulate the operation of the inverters in the microgrid. The performance of our proposed adaptive threshold clearly edges over a fixed threshold method.INDEX TERMS Microgrids, grid-forming inverters, adaptive threshold, fault detection. Nomenclature

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Section: B Comparison With Similar Detection Techniquesmentioning

confidence: 99%

Section: B Comparison With Similar Detection Techniquesmentioning

confidence: 99%

Adaptive Fault Detection for Grid-Forming Inverters

Intriago,

Zhang

2024

IEEE Access

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“…Reference [24] explores the fundamental issues of converter control for islanded microgrids under faulty conditions. In [25], a superimposed phase current scheme with voltage constraint elements is proposed for identifying faults in islanded microgrids. In [26], a self-propelled artillery fault line identification method based on the construction of high-frequency zero-sequence voltage and zero-sequence current is proposed for islanded microgrids.…”

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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Fast and Distortion-Free Short-Circuit Detection and Protection Scheme With Fault Ride-Through Capability Applied to Four-Leg VSI

Oggier

Botterón

et al. 2023

IEEE Trans. Power Electron.

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A Fault Detection Scheme for Islanded-Microgrid with Grid-Forming Inverters

Cited by 4 publications

References 18 publications

Adaptive Fault Detection for Grid-Forming Inverters

Adaptive Fault Detection for Grid-Forming Inverters

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

Fast and Distortion-Free Short-Circuit Detection and Protection Scheme With Fault Ride-Through Capability Applied to Four-Leg VSI

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