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 56 for “"real power"”.
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Real power and frequency control of large electric power systems under open access
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Power System Control with Distributed Flexible AC Transmission System Devices
… devices offer many potential benefits to power systems. This work examines the impact of installing D-FACTS devices by studying the sensitivities of power system quantities such as voltage magnitude, voltage angle, bus power injections, line power flows, and real power losses with respect …
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The application and assessment of active network management techniques for distribution network power flows
… passive networks due to bi-directional power flows creating voltage fluctuations and uncertainty in power flow magnitudes. In addition, conventional planning methods results in financial barriers that are preventing DG connections due to the high cost of reinforcing the existing …
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Incorporation of linearized sensitivities in the Ward method of equivalencing
Linear reduction of large nonlinear power system networks reduces computation time significantly when studying large numbers of network outages for systems planning purposes. The Ward equivalencing procedure is one such reduction technique which has been used extensively in the industry for three …
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A fast non-dominated sorting guided genetic algorithm for multi-objective power distribution system reconfiguration problem
… THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Power distribution systems are designed and constructed as closed loops, but they are operated in a radial topology by choosing suitable open tie switches. Radial configurations are used because they satisfy various operational and protection …
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Analytic representation of quantum systems
… system which has the displacement operator to real power t, as time evolution is also studied. The Bargmann analytic representation for infinite dimension systems, with variables in R, is also studied. Mittag-Leffler function are used as examples of Bargmann function with arbitrary order of …
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Power-Hardware-In-The-Loop (Phil) Considerations and Implementation Methods For Electrically Coupled Systems
<p>Power-Hardware-In-the-Loop (PHIL) simulations are increasingly useful for the design and validation of new products as well as for system interaction studies. In a PHIL simulation portions of a system are modeled in software and naturally coupled with actual hardware components with real power …
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5GHz CMOS resonant clock buffer with quadrature generation for fiber optic applications
Clock buffers constitute a major source of power dissipation in VLSI circuits. In CMOS the load is primarily capacitive and hence an inductive shunt can reduce real power needs. This almost-adiabatic topology is referred to as a resonant buffer. Two resonant buffers can be actively controlled by …
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The Final Frontier of Freedom: a Prospectus for Future Democratization of the Middle East
… has had some successes and enjoys some degree of real power, but its hold is tenuous, and can be undone at any time. Nevertheless, representative democracy is slowly but surely gaining a lasting foothold in these states, and can serve as models for the region to adopt.
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Direct Power Control of AC Motors
In this thesis, the possibilities of direct power control (DPC) of induction motors (IMs) and permanent magnet synchronous motors (PMSMs) fed by a voltage source inverter have been studied. Three different approaches of DPC for IMs and one for PMSMs are proposed and investigated. They are: (a) …
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Reliability analysis of single-phase photovoltaic inverters with reactive power support
Reactive power support is expected to be an emerging ancillary requirement for single-phase photovoltaic (PV) inverters. This work assesses related reliability issues and focuses on the second stage or inversion process in PV inverters. Three PV inverter topologies are analyzed and their …
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Optimization algorithms for loading military diesel generators
… for meeting the ELD problem to provide power to soldiers in forward operating bases. The constraints include the use of military diesel gensets that remain disconnected from each other and are loaded below a user-defined real power threshold (for a reliability safety cushion). In …
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Multi-purpose applications of energy storage systems in a power system network
… nadir (during contingency events), reduction of real power losses, and mitigation of voltage deviations using the deep sleep optimizer (DSO) algorithm was developed. The proposed method establishes a relationship between frequency nadir, voltage variations, power losses, and the BESS multiplier …
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Load Flow Study for Utility-Scale Wind Farm Economic Operation and Reactive Power Grid Compliance
… that are paralleled and connected to inject power to one location on the transmission grid. There are real power losses and reactive power drops that must be taken into consideration for these projects for plant performance and compliance. The better the performance of each new and operating …
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DECENTRALIZED CONTROLLERS FOR INTERCONNECTED POWER SYSTEMS
… oscillations in a multi-machine electrical power system. A particular real power system comprised of five generating plants and an infinite bus was investigated in these studies. A review is given of the approaches used at present to improve system damping using power system stabilizers and …
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An experimental study of frequency droop control in a low-inertia microgrid
… defense applications require a mobile, scalable power grid that is easily constructed and robust enough to handle radical system changes. These microgrids are usually built using low-inertia generators that are portable and can easily adapt to a rapidly changing environment. Despite the benefits …
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Optimized FTR portfolio construction: the speculator's problem
… us to exploit the salient characteristics of power systems, the topological nature of the underlying network and the historical data, so as to gain mathematical insights that we apply to develop the proposed scheme. The speculator returns are collected from the hourly day ahead markets (DAMs) …
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Microgrid-Enabled Reactive Power Support to Enhance Grid Economics
<p>Reactive power plays an essential role in voltage control and stability in electric power systems. Various Volt/VAR techniques are utilized in electric power systems to maintain the voltage profile within defined acceptable limits and accordingly provide reliability and stability. Reactive power …
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Decentralized frequency control of power systems with deep penetration of wind-based generation
… and uncertain renewable resources into the power grid is calling for more control and regulation of the power system dynamics. In particular, the automatic generation control, which is responsible for maintaining the nominal system frequency and the scheduled real power interchange, needs to …
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A Comparative Study of Cooling System Parameters in U.S. Thermoelectric Power Plants
As the importance of water use in the power generation sector increases across the nation, the ability to obtain and analyze real power plant data is pivotal in understanding the water energy nexus. The Navajo Generating Station in Arizona and the Browns Ferry Nuclear Plant in Alabama are examples …
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