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.
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Showing 1 to 20 of 209 for “"Microgrids."”.
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Advanced control in smart microgrids
… in both AC/DC and DC/AC energy conversions in microgrids. For a microgrid consisting of several DG units, various system level control methods are studied. A novel flux droop control approach is developed for parallel-connected DGs by drooping the inverter flux instead of drooping the inverter …
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Feasibility of grid compatible microgrids
… These solutions include solar home systems and microgrids. However, investment in microgrids has been discouraged by the risk of the central grid expanding into the service area of a microgrid. An attractive solution is to create technical standards for microgrids such that they are able to …
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Residential Microgrids for Disaster Recovery Operations
… of service and also the potential of microgrids to ride through these interruptions. Microgrids can be used before, during, and after a major natural disaster to supply electricity, after the main grid source has been interrupted. This thesis researches the potential of clean energy …
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Local and Central Controllers for Microgrids
… as a guide, so readers are able to learn about microgrids and to design simple controllers for different AC microgrid applications. In addition, this thesis has the objective to provide examples of simulation cases for the hierarchical structure of a basic AC microgrid which can be used as a …
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Dynamics and challenges of microgrids implementation
Microgrids have the capability of operating on an island mode as well as an integrated mode with the smart grid, depending on the requirement and objectives. Recently, microgrids projects have gained popularity both in developed world and developing world because of their ability to lower cost, …
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Towards resilient plug-and-play microgrids
Microgrids have the potential to increase renewable energy penetration, reduce costs, and improve reliability of the electric grid. However, today's microgrids are unreliable, lack true modularity, and operate with rudimentary control systems. This thesis research makes contributions in the areas …
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Applications of game theory in microgrids
… of non-cooperative game and cooperative game in microgrids. For an individual microgrid that is connected with renewable energy sources through DC-DC converters, a non-cooperative game theory based PI controller tuning method is proposed to help make more stable output voltage. For microgrids …
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Systematic control strategy for inverter-based microgrids
Small-scale power systems, microgrids (MGs), are becoming economically and technically feasible due to cost-effective battery storage with high-bandwidth inverter interfaces, thus facilitating efficient energy utilization from renewable sources to maintain autonomous operation without a grid …
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5G Scheduling for Distributed Control in Microgrids
… power system test cases. These test cases are microgrids, and consist of DERs that use distributed control for efficient operation. Under distributed control, the DERs communicate with each other to achieve fast and improved dynamic response. This work develops a co-simulation platform to …
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Protection and Cybersecurity in Inverter-Based Microgrids
Developing microgrids is an attractive solution for integrating inverter-based resources (IBR) in the power system. Distributed control is a potential strategy for controlling such microgrids. However, a major challenge toward the proliferation of distributed control is cybersecurity. A false data …
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Voltage and Reactive Power Control in Islanded Microgrids
… lots of advantages and concerns for islanded microgrids (IMGs), whether it is initiated for emergency, intentionally planned or permanent island system purposes. From the concerns that have not been addressed yet, such as: 1) The ability of the distributed generation (DG) units to maintain …
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Power Management of Remote Microgrids Considering Battery Lifetime
… the grid is not economical or practical. Remote microgrids could be the solution to the problem because they are designed to provide power for small communities within clearly defined electrical boundaries. Reducing the cost of electricity for remote microgrids can help to increase access to …
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Petri net models of microgrids with distributed generators
This thesis introduces some basic concepts and control methods about a microgrid. Then, two hot issues are investigated. One is how to control multiple distributed generators; and another is how to model both discrete event and continuous behaviors of a microgrid. To address these two issues, this …
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Control and stability of autonomous inverter-based microgrids
… to facilitate this change are autonomous microgrids, which allow renewable powered systems to operate independent of the fossil-fuelled power grids. To achieve this, inverters must have grid-forming capabilities, operate in a synchronised manner and share power optimally. However, the …
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Methods for Parameter Estimation with Devices in Microgrids
Microgrids may be described as miniaturized, independent, islanded, autonomous electrical networks. Before deploying or building a microgrid, it is informative to simulate its operation. In such a simulation, one must assign parameter values to the device models, and these parameter values may not …
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Stability-constrained design for low voltage DC microgrids
Microgrids are a promising solution to reducing the energy access gap. However, microgrids are inherently fragile systems as they are not globally stable. This thesis considers two voltage instabilities that can arise in DC microgrids as a result of tightly controlled loads in the presence of …
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A scalable architecture for the interconnection of microgrids
… of renewable generation are daunting in small microgrids due to lack of aggregation. In this work, a methodology is provided that maximizes system-wide reliability through the design of a computationally scalable communication and control architecture for the interconnection of microgrids. An …
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A load shedding scheme for inverter based microgrids
Over the last decade, penetration of microgrids containing distributed generation (DG) sources has increased in grid distribution systems. This requires the stable operation of microgrids when connected to the distribution system as well as during islanding. Islanding that is fault provoked is more …
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Integrated Optimal Dispatch, Restoration and Control for Microgrids
… and communication systems, the adoption of microgrids especially in underserved communities has been slow. The research presented in this dissertation is a significant step forward in this direction by proposing an approach which integrates optimal dispatch, sequential microgrid restoration …
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