Research on an All-Flow Velocity Control Strategy for a 120 kW Variable-Pitch Horizontal Axis Tidal Current Turbine

Horizontal-axis tidal current turbines have considerable potential to harvest renewable energy from ocean tides. The pitch control system is a critical part of variable-pitch turbines. Existing strategies for mainly rely on flow measurement devices obtain velocities, which are costly and subject many limitations in practical applications, making them unsuitable small off-grid In this paper, we propose strategy 120 kW horizontal-axis turbine based the output power generator. torque was calculated blade element momentum theory, dynamic model established. characteristics generator were studied under various rates angles. On basis characteristic analysis, generating efficiency unit improved low rate, limited rated value high-current velocity by regulating angle. Furthermore, novel protection start up proposed protect make full use when exceeds limit value. We performed simulations, obtained results demonstrate effectiveness advantages designed strategies.