Operational |
 
|
Operational |
|
Three separate loading scenarios are considered in the operational model.
•Steady Wind. The steady wind test cases comprise a series of individual simulations, each of which has a constant wind speed between cut-in (3 m/s) and cut-out (25 m/s). The rotor is aligned with the incoming wind flow so there is no skew angle in the horizontal plane. Each simulation is analysed until steady-state conditions have been reached.
•Stepped Wind. In the stepped wind test case, a time varying wind load is applied in a single continuous simulation. The time history of wind speed starts off at 4 m/s, and gradually increases over time in steps of 1 m/s up to 25 m/s, providing a good test of the controller. The rotor is misaligned with the incoming wind flow, creating a horizontal skew angle of 30°.
•Turbulent Wind. The turbulent wind test cases comprise a series of individual simulations, each of which has a mean wind speed between cut-in (3 m/s) and cut-out (25 m/s). Full-field wind turbulence is simulated, according to IEC 61400-1 standard (class 1B). These test cases are representative of real-world power production conditions. Each wind condition is analysed for 10 minutes simulation time.
•Run Time Performance. This section compares the run-time performance of OpenFAST, OrcaFlex and Flexcom. Comparisons are based on the stepped wind test case, in which a time varying wind load is applied in a single continuous simulation.