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 8 of 8 for “"Rate of change of frequency"”.
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Accurate frequency estimation with phasor angles
A power system should always operate in a balanced and stable condition at its designed frequency. Any significant upset of this balance will produce a change in the power system frequency. It is the responsibility of the monitoring and protective devices to detect and restore the system to the …
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Smart management strategies of utility-scale energy storage systems in power networks
Power systems are presently experiencing a period of rapid change driven by various interrelated issues, e.g., integration of renewables, demand management, power congestion, power quality requirements, and frequency regulation. Although the deployment of Energy Storage Systems (ESSs) has been …
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Smart Distributed Generation Systems Using Improved Islanding Detection and Event Classification
… (DG) sources have become an integral part of modern decentralized power systems. However, the interconnection of DG systems to the power grid can present several operational challenges. One such major challenge is islanding detection. Islanding occurs when a DG system is disconnected from …
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Algorithms for the synchrophasor measurement in steady-state and dynamic conditions
Phasor measurement units (PMUs) are becoming one of the key issues of power network monitoring. They have to be able to perform accurate estimations of current and voltage signals either under steady-state or dynamic conditions. The first part of this PhD thesis analyses the impact of the phasor …
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Peak-ratio analysis method for enhancement of LOM protection using M class PMUs
Loss of Mains (LOM) occurs when part of the utility network containing distributed generation (DG) is disconnected from the remainder of the system. Detecting LOM will become more important in the future as higher amounts of DG will be connected to increase the use of renewable energy sources, to …
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Valuing of inertia and fast-acting storage devices in interconnected power grids
As power systems evolve, integration of renewable energy, lightweight-turbine generators and other electronic devices result in: 1) less inertia and maybe worse primary frequency responses (from transient stability perspective of view); 2) stricter ramping requirement (from system operation …
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Multi-purpose applications of energy storage systems in a power system network
… required to achieve a high penetration of renewable energy into the electricity network. However, the utilization of a BESS for a single application can lead to under-utilization and may not be economical. This thesis focuses on the multi-purpose applications of a BESS in an electricity …
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New methods for the protection of embedded generators against the loss of utility networks.
The importance of being able to reliably detect Loss of Mains (LOM) for Embedded Generation (EG) has been much documented. In particular it is very difficult for current methods to detect LOM when the EG is "islanded" with part of the Utility Load which has a similar capacity to the EG. For these …