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Differential current-based fault protection with adaptive threshold for multiple PV-based DC microgrid

Differential current-based fault protection with adaptive threshold for multiple PV-based DC microgrid Differential current-based fault protection with adaptive threshold for multiple PV-based DC microgrid   Abstract: A new differential current-based fast fault detection and accurate fault distance calculation is proposed for photovoltaic (PV)-based DC microgrid. A multiterminal direct current (MTDC) distribution network is studied as an adequate solution for present low-voltage utility grid scenario, where local distributed generators (DGs) are incorporated primarily by power electronics based DC–DC converters, DC–AC voltage-source converters (VSCs). PV…

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Robust optimisation-based microgrid scheduling with islanding constraints

Robust optimisation-based microgrid scheduling with islanding constraints Robust optimisation-based microgrid scheduling with islanding constraints   Abstract: This study proposes a robust optimisation-based optimal scheduling model for microgrid operation considering constraints of islanding capability. The objective is to minimise the total operation cost, including generation cost and spinning reserve cost of local resources as well as purchasing cost of energy from the main grid. To ensure the resiliency of a microgrid and improve the reliability of the local electricity supply, the microgrid is required…

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Decentralized Reactive Power Sharing and Frequency Restoration in Islanded Microgrid

Decentralized Reactive Power Sharing and Frequency Restoration in Islanded Microgrid Decentralized Reactive Power Sharing and Frequency Restoration in Islanded Microgrid   Abstract— P-f and Q-V droop methods are the most common decentralized control methods in islanded microgrid. Although with the P-f droop method an accurate active power sharing can be achieved among distributed energy resources (DERs), by Q-V droop, the reactive power sharing among DERs often deteriorates due to its highly dependence on the power line impedances and the local load. Variation of…

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Predictive Analysis of Microgrid Reliability Using a Probabilistic Model of Protection System Operation

Predictive Analysis of Microgrid Reliability Using a Probabilistic Model of Protection System Operation Predictive Analysis of Microgrid Reliability Using a Probabilistic Model of Protection System Operation   Abstract— Protection continues to be an important factor in the development of microgrids. In this paper, an evaluation strategy is proposed to quantify the effects of deficient protection scheme on reliability indices in a microgrid. In particular, the evaluation strategy takes into account the trigger probability of protective actions under abnormal operating conditions, such as warranted…

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Hybrid Islanding Detection in Microgrid with Multiple Connection Points to Smart Grids using Fuzzy-Neural Network

Hybrid Islanding Detection in Microgrid with Multiple Connection Points to Smart Grids using Fuzzy-Neural Network Hybrid Islanding Detection in Microgrid with Multiple Connection Points to Smart Grids using Fuzzy-Neural Network   Abstract— This paper presents a new hybrid islanding detection approach for microgrids (MGs) with multiple connection points to smart grids (SGs) which is based on the probability of islanding (PoI) calculated at the SG side and sent to the central control for microgrid (CCMG). The PoI values are determined using a combination…

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An Islanding Detection Method by Using Frequency Positive Feedback Based on FLL for Single-Phase Microgrid

An Islanding Detection Method by Using Frequency Positive Feedback Based on FLL for Single-Phase Microgrid An Islanding Detection Method by Using Frequency Positive Feedback Based on FLL for Single-Phase Microgrid   Abstract— An active islanding detection method based on frequency-locked loop (FLL) for constant power controlled inverter in single-phase microgrid is proposed. This method generates a phase shift comparing the instantaneous frequency obtained from FLL unit with the nominal frequency to modify the reference phase angle. An initial low frequency variable triangular disturbance…

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Multiagent-Based Optimal Microgrid Control Using Fully Distributed Diffusion Strategy

Multiagent-Based Optimal Microgrid Control Using Fully Distributed Diffusion Strategy Multiagent-Based Optimal Microgrid Control Using Fully Distributed Diffusion Strategy   Abstract— This paper proposes a multiagent-based optimal microgrid control scheme using a fully distributed diffusion strategy. A two-level cooperative optimization multiagent system is adapted for distributed energy resources economic dispatch. The lower level implements an adaptive droop scheme based on online no-load frequency adjustments. The upper level implements distributed communication using diffusion between neighboring agents for optimal microgrid management. The proposed control scheme enables…

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Optimal droop gains assignment for real-time energy management in an islanding microgrid: a two-layer techno-economic approach

Optimal droop gains assignment for real-time energy management in an islanding microgrid: a two-layer techno-economic approach Optimal droop gains assignment for real-time energy management in an islanding microgrid: a two-layer techno-economic approach   Abstract: Real-time energy management is an important challenge in today's microgrids. In this study, a two-layer technoeconomic energy management framework is proposed for an islanding microgrid. The minimisation of operation and emission costs are considered in the first layer procedure. Dynamic performance of dispatchable distributed energy resources is taken into…

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Self-adaptive inertia control of DC microgrid based on fast predictive converter regulation

Self-adaptive inertia control of DC microgrid based on fast predictive converter regulation Self-adaptive inertia control of DC microgrid based on fast predictive converter regulation   Abstract: To solve the problem of low inertia in DC microgrid and enable the distributed units to provide adaptive inertia support for the system under disturbance, this study proposes a novel adaptive inertia control strategy for DC microgrid combined with fast predictive converter control. In this strategy, adaptive coordinated inertia control of wind power system, AC power grid…

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DC Microgrid Technology: System Architectures, AC Grid Interfaces, Grounding Schemes, Power Quality, Communication Networks, Applications and Standardizations Aspects

DC Microgrid Technology: System Architectures, AC Grid Interfaces, Grounding Schemes, Power Quality, Communication Networks, Applications and Standardizations Aspects DC Microgrid Technology: System Architectures, AC Grid Interfaces, Grounding Schemes, Power Quality, Communication Networks, Applications and Standardizations Aspects   Abstract- To meet the fast growing energy demand and, at the same time, to tackle environmental issues resulting from conventional energy sources, renewable energy sources are utilized in power networks to ensure reliable and affordable energy for the public and the industrial sectors. Integration of renewable…

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