考虑模型失配的波浪发电系统功率优化LQR控制

POWER OPTIMIZATION LQR CONTROL FORWAVE POWER SYSTEM CONSIDERING MODEL MISMATCH

为降低复杂海况对波浪发电系统的影响,改良目标价值函数,设计线性二次型最优控制器,约束系统运动状态同时提升波能捕获能力。通过调整权重矩阵求取最优反馈增益,获得理想q轴电流并采用空间矢量控制策略跟踪控制之,平衡系统物理约束与功率捕获关系;模型失配时根据理想模型与实际装置位移差值,基于HJI理论设计RBF鲁棒控制器,补偿系统失配运动状态与功率。仿真结果表明:在不规则激励力下,所提控制策略动态性能好、鲁棒性强,在满足系统物理约束的同时可有效提高波能捕获能力,补偿系统因失配减少的功率。

In order to reduce the impact of complex sea conditions on the wave power system,it is necessary to improve the objective value function and design a linear quadratic optimal regulator to constrain the motion state of the system and improve the ability to capture wave energy.By adjusting the weight matrix,the optimal feedback gain is calculated and the ideal q-axis current is obtained,and the space vector control strategy is used to track and control it to balance the relationship between the physical constraints of the system and the power capture;When the model is mismatched,according to the displacement difference between the ideal model and the actual device,the RBF robust controller is designed based on the HJI theory to compensate for the mismatched motion state and power of the system;The simulation results show that the proposed control strategy has good dynamic performance and strong robustness under irregular excitation force,and while satisfying the physical constraints of the system,it can effectively improve the wave-energy capture ability,and compensate the power reduced by the system mismatch.