基于参考模型补偿的波浪发电功率优化控制

OPTIMAL CONTROL OF WAVE ENERGY GENERATING POWER BASED ON REFERENCE MODEL COMPENSATION

为提高不规则海况下直驱式波浪发电系统的功率捕获能力,利用流体仿真软件获取等效辐射阻尼力系数,建立波浪发电装置对应的非线性水动力模型,通过能量函数极值构造最优功率捕获下的反电磁力,基于磁场定向控制策略跟踪控制最优电磁力;针对实际模型失匹引起的状态误差和功率损失问题,设计自适应补偿控制律修正实际模型与理想模型间的偏差,补偿功率损耗。仿真结果表明:在同样波浪激励下,所提控制策略响应速度快,鲁棒性强,最高可提升系统约50%的输出功率并能补偿15%的功率损耗。

In order to improve the output power of the direct-drive wave energy conversion at irregular sea conditions,the fluid simulation software was used to obtain the equivalent radiation force coefficient and formulate the corresponding nonlinear hydrodynamic model.The inverse electromagnetic force under optimal power capture is constructed by the extreme value of the energy function.The optimal electromagnetic force is tracked and controlled based on the field oriented control strategy.Aiming at the state variable error and power loss caused by the mismatch between actual model and ideal model,an adaptive compensation control law was designed to correct the deviation and compensate for power loss.Simulation results show that the proposed strategy has fast response speed and strong robustness on direct-drive wave energy conversion system under the same complex wave excitation,and can increase the output power of the system by about 50%and compensate the power loss by 15%.