PERFORMANCE OF PITCH AND STALL REGULATED TIDAL STREAM TURBINES ERFAN.K ROLL NO:1 S8,EEE :
INTRODUCTION
• Tidal power is a form of hydropower.• It is a renewable energy source which convert energy
of tides to electricity.• It has a high potential for future power generation.• In middle ages and roman times tidal power is used in
mill grains.• First tidal power plant is RANCE TIDAL POWER
STATION ,FRANCE ,1966.
TIDAL STEAM TURBINE
• TST extract kinetic energy from tides.• TSTs are mainly bottom mounted, low solidity,
horizontal axial flow rotors.• Turbulence and waves vary the flow speed.• For regulated power output pitch and stall regulated
TSTs are used.• In pitch regulated TSTs the pitch angle of blade is varied.• Actively or passively induced stall is used in stall
regulation
TIDAL POWER
• Power extracted from tidal flow
• Tip speed ratio
• Compare with wind turbines TSTs are low speed.• Ratio of radii of TSTs and WT is
0.54.• Tip speed ratio is 0.3.
PITCH REGULATED TST ANALYSIS
• Above rated speed the system is active• Pitch system consist of accutator,rate limiter,angle
limiter.• Linerised system equation
• Plant dynamic equation is
CONTROL DESIGN
•Control design equation
•Bandwidth is reduced to 300-490 rad/s
•Obtained good stability margin