Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 63 for “"Islanding"”.
-
Intelligent Instability Detection for Islanding Prediction
… unit (PMU) based instability detection for islanding prediction procedures using decision tree and neural network modeling. The islanding in the power system define as a separation of the coherent group of generators from the rest of the system due to contingencies, in the case that all …
-
Deep learning for islanding detection of grid-connected photovoltaic systems
… protection when considering the unintentional islanding of these resources. Typically, when faults occur, an island or multiple islands may be formed throughout the electrical power distribution system. When the island includes one or more distributed energy resource, there is usually a serious …
-
Wide Area System Islanding Detection, Classification, and State Evaluation Algorithm
… of system<br />observability. A power system islanding contingency could be one of the most severe<br />consequences of wide-area system failures. It might result in enormous losses to both the power utilities and the consumers. Even those relatively small and stable islanding events may …
-
A Novel Passive Islanding Detection Method Based on Phase-Locked Loop
… has led to challenges in the detection of islanding. Among different islanding detection methods (IDMs), passive methods are the least intrusive and typically require the lowest investment cost. However, they generally suffer from larger non-detection zones (NDZs) and higher nuisance …
-
Islanding detection in distribution system embedded with renewable-based distributed generation
… voltage index is proposed in this work to detect islanding operation in distribution systems embedding DGs. The proposed approach has been tested in several islanding and non-islanding scenarios using IEEE 13-bus distribution system. The results have shown the effectiveness of the proposed …
-
Control of distributed generation for grid-connected and intentional islanding operations
… for DG capable of working in both intentional islanding (stand-alone) and grid-connected modes. In the grid-connected mode of operation, the DG is connected to the utility. The utility, which is assumed to be stiff, sets the voltage at the terminal of the DG inverter. The inverter controls the …
-
Smart Distributed Generation Systems Using Improved Islanding Detection and Event Classification
… challenges. One such major challenge is islanding detection. Islanding occurs when a DG system is disconnected from the rest of the power grid. Islanding can present serious safety hazards and therefore an accurate and fast islanding detection technique is mandated by DG interconnection …
-
Islanding Detection of Grid Connected Distributed Generation Resources Using Symmetrical Components
… challenging problems in distribution network is islanding detection, since it causes serious problems for equipment connected to the network, specially distributed generators (DG). Network fluctuations occurring at different situations impact the accuracy of islanding detection method. The …
-
Analysis and Design of Phase Lock Loop Based Islanding Detection Methods
… discusses the grid interface issue of anti-islanding. An electric island occurs when a circuit breaker in the electric power system trips. The distributed resource should disconnect from the electric grid for safety reasons. This thesis will give an overview of the possible methods. Each …
-
Transient Stability Prediction based on Synchronized Phasor Measurements and Controlled Islanding
… a slow- coherency based intelligent controlled islanding scheme is also developed to restore the stability of system. It enables the generators in the same island to stay in synchronism and the imbalance between the generators and load demand is minimized.
-
A Local Measurement Based Protection Methodology for Initiating Controlled Islanding in Power Systems
… problem, researchers have proposed controlled islanding as a last resort that splits the power system into individual intentional islands. A controlled islanding methodology needs to (a) predict system instability “when” islanding is to be initiated and (b) find locations “where” islanding can …
-
Advanced Power Sharing Scheme under Unbalanced and Nonlinear Loads in an Islanding Microgrid
… scheme with unbalanced and harmonic loads in islanding micro grid is presented to eradicate power sharing problems and reduce unbalanced voltage and harmonics distortion. The hierarchical control structure comprises primary and secondary levels. For improving voltage quality, a secondary …
-
Control of Power Conversion Systems for the Intentional Islanding of Distributed Generation Units
… system either in the connected or disconnected (islanding) mode to the utility; thus not allowing for both modes to be implemented and transitioned between. Existing detection and re-closure algorithms can also be improved upon. Dependent upon the method implemented, detection algorithms can …
-
Islanding Detection and Cybersecurity in Inverter-Based Microgrids Under a High-Noise Environment
Islanding occurs when a connected load to the grid is disconnected from the grid and energized solely by local generators. Islanding can result in frequency and voltage instability, changes in current, and overall poor power quality. Poor power quality can interrupt industrial operations, damage …
-
Phase-Locked Loops, Islanding Detection and Microgrid Operation of Single-Phase Converter Systems
… operate in multiple modes of operation, but with islanding detection and resynchronization capabilities for isolation from and reclosure to the grid. The proposed system includes control architecture capable of operating in multiple modes, and with the ability to smoothly transfer between modes. …
-
A load shedding scheme for inverter based microgrids
… to the distribution system as well as during islanding. Islanding that is fault provoked is more likely to cause unstable microgrid operation than planned islanding. During fault provoked islanding, unstable operation is exacerbated when induction motor (IM) loads are present. Using the MATLAB …
-
A novel zonal adaptive DG anti-islanding protection scheme to enhance future system stability using real-time inertia estimates
… zonal adaptive Distributed Generation (DG) anti-islanding protection scheme has been developed and demonstrated with protection settings being adjusted in response to estimated levels of system inertia. Enhancement of the performance of DG anti-islanding protection has been tested and …
-
Modern Adaptive Protection and Control Techniques for Enhancing Distribution Grid Resiliency
… protection schemes can be seen in the field of islanding or Loss of Mains(LOM) detection and general fault identification and isolation. Adaptive protection schemes are needed to properly resolve these issues. Although, previous works in this field have dealt with this situation, a more …
-
Impact of load type on microgrid stability
… problems in the microgrid, especially when islanding is fault induced. Software simulation suggests that induction motor loads on the microgrid significantly decrease stability during fault induced islanding. To validate the software simulations and to investigate the impact of load type on …
-
Simulation of microgrid system and low-cost wireless communication network
… or isolated modes of operation. A passive islanding detection method is utilized to switch over from P-Q to V/F control mode, when islanding is detected. The behavior of the microgrid under various faults and other conditions is analyzed. In the second part of the thesis, the need for a …
Page 1 of 4