基于超螺旋滑模的直驱波浪发电系统功率优化

POWER OPTIMIZATION OF DIRECT-DRIVE WAVE POWER GENERATION SYSTEMS BASED ON SUPER-TWISTING SLIDING MODE

针对复杂工况下的直驱式波浪发电系统功率提取问题,提出一类超螺旋滑模控制策略。由ANSYS软件获取浮子辐射力信息,建立系统水动力方程,构造并求解能量函数,得到最大功率捕获策略下的参考电磁力。以电压、电流为输入,设计基于超螺旋滑模的模型参考自适应速度观测器,实现无速度传感器控制。结合矢量控制策略,设计超螺旋滑模电流控制环,保证系统对参考信号的跟踪效果。仿真结果表明,所提速度观测器观测误差小,电流控制环可准确跟踪期望电流,系统输出功率提高,动态性能更好。

Aimed at the power extraction of direct drive wave power generation system under complex working conditions,a super-twisting sliding mode control strategy was proposed.The radiation force information was obtained by ANSYS and the hydrodynamic equation of the system was established.By constructing and solving the energy function,the reference electromagnetic force under the maximum power capture strategy was obtained.Taking the voltage and current as input,a model reference adaptive velocity observer based on super-twisting sliding mode is designed,the speed sensorless control was realized.Combined with the vector control strategy,the super spiral sliding mode current control ring is designed to ensure the tracking effect of the reference signal.The simulation results show that the proposed speed observer has less observation error,the current control loop can accurately track the expectation current,the system output power is improved and the dynamic performance is better.