Wind-turbine-generator interference to electromagnetic systems. Final report, April 1978-March 1979
Selected problems associated with wind turbine generator interference to the electromagnetic environment have been investigated theoretically and experimentally. A study of the reception of circularly polarized electromagnetic waves in the presence of a slowly rotating rectangular metal plate indicates that a similarly polarized receiving antenna discriminates against the scattered signals in the backward scattering region. This implies that the video distortion to TV reception within the backward interference zone of a windmill will be less with circularly polarized signals than with conventional horizontally polarized signals, all other conditions being equal. A method has been developed to estimate the percent viewing time during which unacceptable video distortion may occur during TV reception within the interference zone of a WTG, by taking into account the relevant statistical parameters, e.g., wind speed, direction, etc. The electromagnetic scattering characteristics of small scale models of the Darrieus and Giromill have been measured in a microwave anechoic chamber. A laboratory microwave TV system has been developed for studying the TV interference produced by a variety of windmills. Some representative results are given for the Giromill, Darrieus and MOD-0 machines. Possible interference to the performance of a Loran-C system caused by large horizontal axis windmills has been investigated theoretically and it has been found that under normal conditions no degradation in performance is likely to occur due to the siting of a WTG near a Loran-C transmitter.
- Research Organization:
- Michigan Univ., Ann Arbor (USA). Radiation Lab.
- DOE Contract Number:
- AC02-76ET20234
- OSTI ID:
- 5346944
- Report Number(s):
- DOE/ET/20234-T1; ON: DE82019039
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
WIND TURBINES
INTERFERENCE
DARRIEUS ROTORS
GIROMILL TURBINES
NAVIGATIONAL INSTRUMENTS
POLARIZATION
SCALE MODELS
SCATTERING
STATISTICS
TELEVISION
TESTING
WIND
MACHINERY
MATHEMATICS
ROTORS
STRUCTURAL MODELS
TURBINES
TURBOMACHINERY
VERTICAL AXIS TURBINES
170500* - Wind Energy- Environmental Aspects