Adaptive Super-Twisting Sliding Mode Control for Ocean Current Turbine-Driven Permanent Magnet Synchronous Generator
Adaptive Super-Twisting Sliding Mode Control for Ocean Current Turbine-Driven Permanent Magnet Synchronous Generator
复制标题
洋流涡轮驱动永磁同步发电机的自适应超扭转滑模控制
DOI：
10.23919/acc45564.2020.9147480
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
James H. VanZwieten
中科院分区：
文献类型：
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作者：
Yufei Tang;Yuantao Zhang;Arezoo Hasankhani;James H. VanZwieten
蓝色经济产业，如水产养殖或深海采矿，正在进一步向近海转移，以利用海洋的巨大规模，但向近海转移需要获得稳定、可靠的电力，而不受陆地电网的束缚。在与电网隔离的地方，低成本发电的潜力很大，海洋水动力涡轮机可以帮助满足这种不断增长的电力需求。提出了一种新的超扭滑模自适应控制策略，用于海流涡轮驱动永磁同步发电机。为了保证系统在最大功率点跟踪（MPPT）过程中的鲁棒性和抑制抖振，提出了一种超扭转滑模控制的自适应增益调整技术。这种技术不需要了解不确定性的上限，例如外部海洋环境的变化或未建模的动力学。更具体地说，当系统状态接近或处于滑模状态时，自适应增益率可以随滑动变量变化，这是本文的新颖之处。自适应动态增益能够快速建立真正的2-滑模，并且在不高估或低估干扰边界的情况下完成。利用李雅普诺夫函数技术分析了闭环系统的有限时间收敛性。利用720千瓦pmsg OCT的数值模型验证了所提出控制策略的有效性，并基于从佛罗里达州东南部的墨西哥湾流收集的洋流数据模拟了操作环境条件。
Blue economy industries, such as aquaculture or deep sea mining, are moving further offshore to take advantage of the vast scale of the ocean, but moving further offshore requires access to consistent, reliable power untethered to land-based power grids. With a high potential for low cost power generation in locations otherwise isolated from the grid, marine hydrokinetic turbines could serve to help meet this growing power demand. This paper presents a novel adaptive super-twisting sliding mode control strategy for permanent magnet synchronous generators (PMSG) driven by ocean current turbines (OCT). To ensure robustness and mitigate chattering during maximum power point tracking (MPPT), an adaptive gain adjustment technique is proposed for super-twisting sliding mode control. This technique does not require knowledge of the upper bounds of uncertainties, such as external marine environment variability or unmodeled dynamics. More specifically, the adaptive gain rate can vary with a sliding variable when system states are approaching or on the sliding mode, which constitutes the novelty of this paper. The adaptive dynamic gain enables the rapid establishment of the real 2-sliding mode, and this is accomplished without overestimating or underestimating the disturbance boundary. The Lyapunov function technique is used to analyze the finite time convergence of the closed-loop system. A numerical model of a 720-kW PMSG-based OCT is utilized for validating the effectiveness of the proposed control strategy, with simulated operating environmental conditions based on ocean current data collected from the Gulf Stream off Southeast Florida.