Constant-Bandwidth Maximum Power Point Tracking Strategy for Variable-Speed Wind Turbines and Its Design Details
Constant-Bandwidth Maximum Power Point Tracking Strategy for Variable-Speed Wind Turbines and Its Design Details
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DOI：
10.1109/tie.2012.2225401
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发表时间：
2013-11
影响因子：
7.7
通讯作者：
Jing Chen;Jiawei Chen;Chunying Gong
中科院分区：
文献类型：
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作者：
Jing Chen;Jiawei Chen;Chunying Gong
对低于额定风速的变速风力涡轮机实施最大功率点跟踪（MPPT）控制有助于涡轮机提高其效率，从而增加其年能量产量。然而，对于最常用的最佳功率（OP）MPPT方法，它被证明有跟踪速度慢的缺点。更糟糕的是，当涡轮机在低风速下运行时，跟踪带宽将变得更窄，这导致年能量产量的降低。为了克服这一缺点，本文设计了一种改进的MPPT方法，它是在传统的OP控制方法的基础上进行改进的。通过对系统动力学特性的频域分析，指出了改进MPPT方法的实现细节和系统动力学特性的选取原则。理论分析得到了1.2 kW变速风力涡轮机的仿真和实验结果的验证。
Implementation of maximum power point tracking (MPPT) control to variable-speed wind turbines below the rated wind velocity helps the turbine improve its efficiency, thereby increasing its annual energy yield. However, for the most commonly used optimum power (OP) MPPT method, it is proved to have the drawback of low tracking speed. Moreover, what is worse, the tracking bandwidth will get narrower when the turbine is operating under low wind velocities, which results in the reduction of annual energy yield. To overcome this drawback, an improved MPPT method, which is improved from the conventional OP control method, is designed in this paper to broaden the MPPT bandwidth. The design details on how to realize the improved MPPT method and the principle of choosing a proper system dynamics are both pointed out after analyzing the system dynamics in frequency domain. The theoretic analysis is verified by simulation and experimental results performed by a 1.2-kW variable-speed wind turbine.