直驱式波浪发电系统无源-滑模控制策略

针对不规则波输入激励工况下的直驱式波浪发电系统,提出一类无源-滑模控制策略。利用双线性幅度法计算不规则波浪主频,结合波能捕获策略得到期望跟踪曲线,设计无源控制器实时跟踪期望曲线;为削减外部扰动影响并提高系统稳定性,在保证系统无源下引入滑模控制策略。采用扩张状态观测器代替速度传感器,辨识动子速度。仿真结果表明：双线性幅度法能预估不规则波浪主频,扩张状态观测器观测到的速度误差小,所提控制方案能快速响应期望电流变化,准确跟踪期望曲线,鲁棒性强。

PASSIVE-SLIDING MODE CONTROL STRATEGY OF DIRECT-DRIVE WAVE POWER SYSTEM

For the direct-drive wave power system whose input excitation is irregular wave, a passive-sliding mode control strategy is proposed. The bilinear amplitude method is used to calculate the dominant frequency of irregular waves, combined with the wave energy capture strategy to obtain the desired tracking curve, design a passive controller to track the desired curve in real time. In order to reduce the influence of external disturbances and improve the stability of the system, a sliding mode control strategy is introduced to ensure that the system is passive. The resulting impact improves system stability. The expanded state observer is used to replace the speed sensor to realize the identification of the mover's speed. The simulation results show that the bilinear amplitude method can realize the dominant frequency estimation of irregular waves, the speed error observed by the expanded state observer is small, and the proposed control scheme can quickly respond to the expected current changes, accurately track the expected curve, and has strong robustness.