Optimized dielectric barrier discharge‐plasma actuator for active flow control in wind turbine

摘要

The efficiency of horizontal axis wind turbines greatly depends on the efficient utilization of the aerodynamic lift force. The coefficient of lift could be altered using the flow control techniques. The dielectric barrier discharge (DBD)-based plasma actuator is an evolving active flow control technique in which the moment induced in air by DBD plasma activation improves the power capturing capacity of the blades without any mechanical actuation. But due to the offset plasma actuation in extreme wind condition, it would induce structural stress on turbine components. The effect of optimized plasma actuation by varying the voltage amplitude and with a fixed frequency of 24 kHz is to be analyzed. The duty cycle of the plasma actuator is maintained constant at 90%. The optimal point plasma operation would ensure the maximum power production and reduced bending moment of blades. The optimum plasma activation also reduces the power consumption of the actuator. The instantaneous optimum Pareto best is obtained by recursive identification of dynamic system response using non-dominated sorting genetic algorithm 2. The converging points of the algorithm are validated using a NREL FAST 5MW offshore baseline wind turbine model interfaced with MATLAB.