Modelling and characteristics analysis of the pitch system of large scale wind turbines
Modelling and characteristics analysis of the pitch system of large scale wind turbines
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DOI：
10.1243/09544062jmes2257
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
J. Dai;Y-P Hu;D.S. Liu;X. Long
中科院分区：
文献类型：
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作者：
J. Dai;Y-P Hu;D.S. Liu;X. Long
对大型风力发电机组的变桨距传动系统进行了分析。该变桨系统采用感应电动机、三级行星减速器和电机矢量控制。为了研究系统的动态特性，建立了系统的非线性动力学模型，主要包括三部分：d-q坐标系下的感应电机模型、三级行星齿轮系统的动力学模型和传动轴模型。分别对齿轮箱-叶片子系统和电机-齿轮箱-叶片系统的动力响应进行了详细分析。然后，建立了变桨距系统控制模型，其中采用转子磁链定向矢量控制和带速度和位置反馈的双闭环伺服控制。仿真中采用TR-BDF 2算法求解动力学方程。研究结果表明，在稳态时桨距角与指令值偏差很小，当齿轮间隙产生冲击效应时，桨距速度和加速度会出现波动，不同叶片在某个变桨距区域可能具有不同的变桨距速度和加速度。研究结果合理解释了单桨距系统的运行机理，为大型风力发电机组单桨距控制系统的优化设计和控制提供了理论依据。
The individual pitch drive system of large-scale wind turbines was analysed in this article. In this pitch system, the induction motor, three-stage planetary gearbox, and motor vector control were adopted. In order to investigate the system dynamic behaviour, its non-linear dynamical model was established, mainly including three parts: induction motor model in d—q frame, dynamic model of three-stage planetary gears, and transmission shaft model. The dynamic responses of gearbox—blade subsystem and motor—gearbox—blade system were analysed in detail, respectively. Then, the pitch system control model was established in which rotor flux field-oriented vector control and double close-loop servo control with speed and position feedback were employed. In simulation, the algorithm TR-BDF2 was adopted to solve the dynamic equations. The research results show that the deviation between the pitch angle and its command value is very small in steady state, pitch speed and acceleration fluctuations appear when impact effect is produced due to gear backlash, and the different blade may have different variable pitch speed and acceleration in some pitch region. The research results give a reasonable explanation for running mechanism of the individual pitch system and are helpful for optimization design and control for the individual blade pitch control system used in large-scale wind turbines.