通过分析机组在触发偏航超限停机过程中,叶片在不同方位角下的受力情况,指出大偏航角下叶片受载不均衡是导致轮毂中心出现极限载荷的根源,并研究桨距角与偏航角方向对不均衡受载的影响,在原始控制策略的基础上,引入基于叶轮方位角的独立变桨控制（IPC）变速率停机策略,减小机组在负向大偏航下的气动不平衡,大大降低了轮毂与偏航轴承中心极限载荷,依据IEC标准,并以某7.0 MW海上风力机为研究对象,通过偏航超限工况载荷计算,对比分析发现,基于叶轮方位角IPC变速率停机策略,可减小不平衡推力引入的倾覆弯矩,达到减小机组载荷的目的,为此特定风况下的降载提供了可靠依据。
Abstract
By analyzing the blade loading conditions at different azimuth angles during the process of triggering yaw over-limit shutdown in wind turbines, it is pointed out that the unbalanced blade loading under large yaw angles is the root cause of the extreme load in the hub center. The effects of pitch angle and yaw angle direction on the unbalanced loading are studied. Based on the original control strategy, an IPC variable-speed shutdown strategy based on the blade azimuth angle is introduced to reduce the aerodynamic imbalance of the turbine under negative large yaw, greatly reducing the extreme loads in the hub and yaw bearing centers in accordance with IEC standards. Taking a 7.0 MW offshore wind turbine as example and conducting load calculations under yaw over-limit operating conditions, comparative analysis shows that the IPC variable-speed shutdown strategy based on blade azimuth angle can reduce the overturning bending moment introduced by unbalanced thrust, achieve the goal of reducing turbine loads, and provide a reliable basis for load reduction under specific wind conditions.
关键词
风电机组 /
叶片 /
载荷优化 /
偏航控制 /
独立变桨控制 /
Bladed仿真
Key words
wind turbines /
blades load alleviation /
yaw control /
individual pitch control /
Bladed simulation
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