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  • 1
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    Control of wind turbine generators connected to power systems (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A unique simulation model based on a Mode-O wind turbine is developed for simulating both speed and power control. An analytical representation for a wind turbine that employs blade pitch angle feedback control is presented, and a mathematical model is formulated. For Mode-O serving as a practical case study, results of a computer simulation of the model as applied to the problems of synchronization and dynamic stability are provided. It is shown that the speed and output of a wind turbine can be satisfactorily controlled within reasonable limits by employing the existing blade pitch control system under specified conditions. For power control, an additional excitation control is required so that the terminal voltage, output power factor, and armature current can be held within narrow limits. As a result, the variation of torque angle is limited even if speed control is not implemented simultaneously with power control. Design features of the ERDA/NASA 100-kW Mode-O wind turbine are included.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Simulation studies of multiple large wind turbine generators on a utility network (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The potential electrical problems that may be inherent in the inertia of clusters of wind turbine generators and an electric utility network were investigated. Preliminary and limited results of an analog simulation of two MOD-2 wind generators tied to an infinite bus indicate little interaction between the generators and between the generators and the bus. The system demonstrated transient stability for the conditions considered.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Large Wind Turbine Design Characteristics and R and D Requirements; p 375-384
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Synchronization of the DOE/NASA 100-kilowatt wind turbine generator with a large utility network (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The DOE/NASA 100 kilowatt wind turbine generator system was synchronized with a large utility network. The system equipments and procedures associated with the synchronization process were described. Time history traces of typical synchronizations were presented indicating that power and current transients resulting from the synchronizing procedure are limited to acceptable magnitudes.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-73861 , E-9450 , DOE/NASA/1028-77/10
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A 100 kW experimental wind turbine: Simulation of starting, overspeed, and shutdown characteristics (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The ERDA/NASA 100 kW experimental wind turbine is modeled on a digital computer in order to study the performance of a wind turbine under operating conditions. Simulation studies of starting, overspeed, and shutdown performance were made. From these studies operating procedures, precautions, and limitations are prescribed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-71864 , E-8629
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Transient response to three-phase faults on a wind turbine generator (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: In order to obtain a measure of its responses to short circuits a large horizontal axis wind turbine generator was modeled and its performance was simulated on a digital computer. Simulation of short circuit faults on the synchronous alternator of a wind turbine generator, without resort to the classical assumptions generally made for that analysis, indicates that maximum clearing times for the system tied to an infinite bus are longer than the typical clearing times for equivalent capacity conventional machines. Also, maximum clearing times are independent of tower shadow and wind shear. Variation of circuit conditions produce the modifications in the transient response predicted by analysis.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-78902 , E-9638
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Transient analysis of unbalanced short circuits of the ERDA-NASA 100 kW wind turbine alternator (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Unbalanced short-circuit faults on the alternator of the ERDA-NASA Mod-O100-kW experimental wind turbine are studied. For each case, complete solutions for armature, field, and damper-circuit currents; short-circuit torque; and open-phase voltage are derived directly by a mathematical analysis. Formulated results are tabulated. For the Mod-O wind turbine alternator, numerical calculations are given, and results are presented by graphs. Comparisons for significant points among the more important cases are summarized. For these cases the transients are found to be potentially severe. The effect of the alternator neutral-to-ground impedance is evaluated.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-73459 , E-8821
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Synchronization of wind turbine generators against an infinite bus under gusting wind conditions (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Studies of synchronizing a wind turbine generator against an infinite bus are performed on a digital computer. In the digital simulation, wind gusts of different magnitudes and durations are hypothesized. Prior to the synchronization, differences of the frequency and phase position between voltages of the alternator and the bus are also included in the simulation. Solutions for rotor speed, generator power angle, electromagnetic torque, wind turbine torque, wind turbine blade pitch angle, and armature current are simulated and presented graphically. The ERDA-NASA 100-kW wind turbine is used as a case study. The results so obtained will thus have immediate applications.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: IEEE PAPER F 77 675-2
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Reduction of alternator apparent-power requirements and harmonic distortion caused by phase-controlled parasitic loads (1970)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Reduction of alternator apparent power requirements and harmonic distortion caused by phase-controlled parasitic loads
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-TM-X-52811 , INTERSOC. ENERGY CONVERSION ENG. CONF.; Sep 21, 1970 - Sep 24, 1970; LAS VEGAS, NV; UNITED STATES
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Synchronization of the ERDA-NASA 100 LkW wind turbine generator with large utility networks (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The synchronizing of a wind turbine generator against an infinite bus under random conditions is studied. With a digital computer, complete solutions for rotor speed, generator power angle, electromagnetic torque, wind turbine torque, wind turbine blade pitch angle, and armature current are obtained and presented by graphs.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-73613 , E-9096 , Control of Power Systems Conf.; Mar 14, 1977 - Mar 16, 1977; College Station, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Motor starting techniques for the 2 to 15 kW Brayton space power system (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Motor starting techniques for 2-15 kW Brayton space power system
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-TM-X-67819
    Format: application/pdf
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