Operating point lookup table

Bladed supports computing the steady state solution/initial conditions automatically based on some user supplied parameters as described in variable speed pitch regulated control model. Alternatively the steady state solution can be partially enforced by supplying a lookup table that maps wind speeds against the desired rotor speeds and pitch angles, see Figure 1. Bladed will then try to compute the generator torque that balances the drive-train equation (drive-train acceleration zero). Bladed uses linear interpolation for evaluating the table. If the table is exceeded the closest available point will be used.

Figure 1: User defined steady state conditions for rotor speed and pitch angle.

Example

An example json code looks like this:

"TurbineOperationalParameters": {
    "NominalHubWindSpeedVsRotorSpeedAndPitchAngle":
    [
        {
            "NominalHubWindSpeed": 5.0,
            "RotorSpeed": 1.0,
            "PitchAngle": 0.0
        },
        {
            "NominalHubWindSpeed": 9.0,
            "RotorSpeed": 2.0,
            "PitchAngle": 0.0
        },
        {
            "NominalHubWindSpeed": 20.0,
            "RotorSpeed": 2.0,
            "PitchAngle": 0.33
        }
    ]
}