POWER OPTIMIZATION OF DIRECT-DRIVE WAVE POWER SYSTEM BASED ON MOMENT MATCHING MODEL REDUCTION
To improve the power capture effect of direct-drive wave power systems under complex operating conditions and to reduce the computational burden on the controller,the model prediction control strategy is improved based on the moment matching algorithm.By building a hydrodynamic model of the system,selecting the key wave frequency and using Sylvester's equation to calculate the expected moments of the system at this frequency,a reduced-order model with matching amplitude and phase characteristics is derived.Based on a reduced-order model of the system,an improved quadratic cost function that accounting for motor copper consumption is constructed and solved,calculate the ideal electromagnetic force,and obtain the desired current tracking value for the q-axis to improve wave energy capture while reducing major system losses.Simulation results show that the moment matching reduced-order algorithm fits well,the dynamic behaviour is good,the wave energy converter efficiency of the proposed control strategy is improved and the average system output power increases.
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