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 19 of 19 for “"Rotor Angle"”.
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Synchronized Rotor Angle Measurement of Synchronous Machines
… and stability protection of generators is the angle of the induced voltage internal to the generator. Current practice is to estimate this value using measurements from the terminals of the generator and mathematical models. This project aims to develop a system that would directly measure the …
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Synchronized Measurement of Machine Rotor Angle and Its Application
The internal voltage angle of a generator is an important parameter that indicates the stability, both transient and steady-state, of the generator. This paper proposes a method of measuring and synchronizing the internal angle using a microprocessor and an optical encoder installed on the shaft of …
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Power flow and rotor angle stability studies of HVAC-HVDC power system interconnections using DigSILENT
The backbone of all industrialised nations is the success of the power sector, which involves an efficient, reliable and secure means of power generation, transmission and distribution. Industrial growth and urbanisation have together endlessly stimulated electrical engineers to ensure that the …
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A new method of utilising stability study results in applying out-of-step protection to allow observability of rotor angle unstable conditions
Power system rotor-angle unstable conditions may cause undesired operation of distance relays, resulting in the unnecessary switching of lines. To prevent the possible undesired operation of distance relays, a protection type known as out-of-step blocking is used. This protection type is …
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The impact of wind generators on a Powe system's transient stability
… of the conventional synchronous generator’s rotor angle and terminal voltage when connected to different types of wind generators. The three different wind generator technologies explored were the squirrel cage induction generator (SCIG), doubly-fed induction generator (DFIG) and the …
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Investigation into voltage and angle stability of a hybrid HVAC-HVDC power network
… (MPL) of the network. Furthermore, the voltage angle, and terminal voltage responses during a three-phase short circuit disturbance was also used to analyze the voltage stability of the networks. For the transient stability study, several case studies were investigated and their dynamic …
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Non-linear excitation and governor control
… systems were considered. Control laws for rotor angle and field flux are derived. The closed loop system is shown to be asymptotically stable. The system can be transferred to a new operating condition corresponding to any desired terminal voltage {dollar}V\sb{t}{dollar} and tie-line power …
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Modeling, control and stability analysis of VSC-HVDC links embedded in a weak multi-machine AC system.
… controllers for enhancing the small-disturbance rotor-angle stability of a weak multi-machine power system with embedded VSC-HVDC links. Three types of linear current controller schemes (proportional-integral, proportional-resonant and Dead-Beat schemes) are investigated and discussed in detail …
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On-line Dynamic Security Assessment in Power Systems.
… which bus voltages are affected by a change in rotor angle of a particular generator. % It is shown that the derived load voltage sensitivities for example allow to determine the contribution of each generator to an observed voltage sag, which is valuable information for identifying preventive …
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Investigation of a new method for synchronous generator loss of excitation protection
… condition. Two methods are used to estimate the rotor angle and bothprovide a similar estimation. The first method depends on the integration of the rotor speed over time, while the second method is based on equations presented in a published paper. Moreover, the algorithm was tested on both a …
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Position estimation of an outer rotor permanent magnet synchronous machine using linear hall-effect sensors and neural networks
… for estimating the angular position for an outer rotor permanent magnet synchronous machine (PMSM). PMSMs are increasingly used as prime movers in electric vehicles such as cars and bicycles, and the precise control of these machines requires reliable feedback of the rotational position of the …
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Electromechanical Wave Propagation Analysis
… to deviations in the synchronous generator rotor angles. The rotor angle deviations propagate as electromechanical waves (EMWs) throughout the power system. These waves became observable since the development of synchrophasor measurement instruments. The speed of EMW propagation is hundreds …
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Critical point study in the Sabah power grid for cascading failure blackouts
… system grid. These issues also can affect the rotor angle of generation motor and cause a loss of generation in the system grid. In this project, the conceptual of Sabah system grid was design for simulation purposes. Then, the identified potential point to be the weakest point was further …
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Generation dispatch with large-scale photovoltaic systems
… strategies that employ power system voltage, rotor angle and frequency control techniques for dealing with the impacts of large-scale PV systems on sub-transmission and transmission power system networks. However, generation dispatch strategy which is equally vital for solving operational …
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Noise from a Rotor Ingesting Inhomogeneous Turbulence
… field sound measurements at several receiving angles have been previously made for a rotor partially embedded in a boundary layer. The inflow distortion effect on the rotor angle of attack distribution was determined directly from the on-blade measurements, and was found to minimally affect the …
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Dynamic State Estimation of Microgrid With Imperfect Data Communication
… six states variables of the generator; namely, rotor angle, speed variant, d- and q- axis transient voltages, d-axis damper flux, and q-axis second damper flux. Both real power and reactive power are used as measurements in our state estimation algorithm. The estimation results are compared with …
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Hierarchical Decentralized Control for Enhanced Stability of Large-Scale Power Systems
… enhancement in a unified manner of voltage and rotor angle stability in large-scale power systems subject to large (e.g., short circuits) and small (e.g., small load changes) disturbances. We study system robustness by calculating local stability margins. We derive decentralized control laws …
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Application of Sweep Frequency Response Analysis and Locked-Rotor Test for Stator Winding Inter-Turn and Broken Rotor Bar Fault Detection of Squirrel-Cage Induction Motors
… are due to the stator winding breakdown and rotor failures, respectively. Most induction motors have a long service life regardless of types and ratings and warrant minimum maintenance to ensure they work properly. Regular maintenance is recommended to check for signs of insulation damage or …
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Bearingless Slice Motor and 6-DoF Position Sensor for Extracorporeal Pump
… of a conventional motor with a suspended rotor, and therefore require no bearings or other mechanical support. Such combined motor and suspension operation requires a motor design that can generate force as well torque in order to stabilize all 6 degrees of freedom. The slice configuration …