This document discusses wind resource assessment for wind farm development. It covers how wind is generated, accessing wind resources through measurement and modeling, and estimating energy production with uncertainties. Key steps include measuring wind speeds on site, correlating to long-term reference stations to predict long-term distributions, modeling wind flows, planning turbine layouts, and estimating annual energy yields while accounting for production losses and uncertainties. Accurate wind assessment is critical for maximizing energy production estimates and ensuring project viability.
13. R. M. Young Wind Monitor Features Propeller-type anemometer with fuselage and tail wind vane Rugged design for use in a variety of climates worldwide Manufactured by R. M. Young Specifications Wind Speed Range: 0-134 mph (0-60 m/s) Accuracy: ±0.6 mph (0.3 m/s) Starting threshold: 2.2 mph (1.0 m/s) Gust survival: 220 mph (100 m/s) Wind Direction Range: 0-360° mechanical, 355° electrical (5° open) Accuracy: ±3° Starting threshold at 10° displacement: 2.2 mph (1.1 m/s)
14. CR800 Measurement and Control Datalogger Features Ideal datalogger where only a few sensors will be measured Stores 4 Mbytes of data and programming in SRAM Data format is table Operating system: PakBus® Software support offered in LoggerNet or PC400 (full-featured) or ShortCut (programming) Detachable keyboard/display, the CR1000KD, can be carried to multiple stations Supports Modbus protocol, SDI-12 protocol, and SDM devices Specifications Analog inputs: 6 single-ended or 3 differential, individually configured Pulse counters: 2 Switched voltage excitations: 2 Control/digital ports: 4 Scan rate: 100 Hz Analog voltage resolution: to 0.33 µV A/D bits: 13
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16. Power Law Profile - use wind speed measurements at two heights to find α - then use a to calculate wind speed at hub height α is the power law exponent (wind shear exponent) u R is the wind speed at height z r
power law should be carefully employed since it is not a physical representation of the surface layer and does not describe the flow nearest to the ground very well (i.e. should only be used for heights above the roughness elements where the flow is free)
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