针对风电机组最大功率跟踪（MPPT）及其控制过程稳定性需求,该文提出一种二阶滑膜-PID（PSOSMC）最大功率跟踪控制策略。为了实现对发电机转矩的稳定控制,通过结合二阶滑膜控制策略与PID控制,由比例积分导数（PID）构建滑模面进而推导出转矩控制律,建立基于PID滑模面的二阶滑膜控制系统模型,并利用Lyapunov稳定性定理证明了控制系统的收敛性。该文从气动效率、发电效率、发电机转矩和低速轴转矩等方面对二阶滑膜-PID策略的有效性进行了评估。研究结果表明,相较于其他控制策略,该文提出的PSOSMC策略能有效提高风电机组的发电效率,并显著降低发电机与低速轴转矩的波动,使风电机组在获得最大功率输出的同时还兼顾有良好的运行稳定性。
Abstract
Maximum power point tracking and its control procedure steadiness qualification of wind turbines are satisfied by the PSOSMC strategy, which is proposed in this work. In order to achieve the stable control of generator torque, the PSOSMC system model is established based on the PID hyperplane, and the stability of the control system is proved by the Lyapunov principles simultaneously. In this work, the PSOSMC strategy is carried out from the aspects of aerodynamic efficiency, power generation efficiency, generator torque and low-speed shaft torque. The results show that the PSOSMC proposed can improve the power generation efficiency of wind turbines compared with other control strategies. Besides, the fluctuation of torque of the generator and the low-speed shaft reduce significantly. It juggles maximum power conversion and pleasurable operational steadiness of wind turbines.
关键词
风电机组 /
最大功率跟踪 /
滑模控制 /
系统稳定性
Key words
wind turbines /
maximum power point trackers /
sliding mode control /
system stability
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基金
国家重点研发计划（2018YFB1501300）; 重庆市技术创新与应用发展专项（cstc2019jscx-mbdxX0003）; 中央高校基本科研业务费（NO.2020CDJQY-A070）
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