基于改进无模型自适应控制的漂浮式海上风机转矩-变桨协调控制策略研究

Research on Torque-Pitch Coordinated Control of Floating Offshore Wind Turbines Based on Improved Model-free Adaptive Control

针对漂浮式海上风机建模困难、频繁变桨造成的严重疲劳损伤等问题,提出一种基于改进无模型自适应控制的转矩-变桨协调控制策略。该策略不依赖漂浮式海上风机的数学模型,通过集成迭代学习控制策略改进无模型自适应控制方法,设计发电机电磁转矩和桨距角作为控制变量的多输入多输出控制器进行协调控制,允许非零度桨距角下风机用做动能缓冲,在平滑输出功率的同时减少变桨动作量。为证明所提出控制策略的有效性,在多种风场景下,与增益调度PI控制等方法进行了对比实验。结果表明:所提出的控制策略使漂浮式海上风机在满足发电功率平稳性的同时减缓了漂浮平台的俯仰运动,可有效降低漂浮式海上风机的疲劳载荷。

A coordinated torque-pitch control strategy based on improved model free adaptive control was proposed to overcome the difficulties in modeling floating offshore wind turbines and the serious fatigue damage caused by frequent pitch action.This strategy didn't rely on the mathematical model of the floating offshore wind turbine.The model free adaptive control method was improved by integrating the iterative learning control strategy;a multi input and multi output controller with the generator torque and pitch angle as control variables was designed for coordinated control;allow the wind turbine to be used as kinetic energy buffer under the non-zero pitch angle,and the amount of pitch action was reduced while the output power was smoothed.To demonstrate the effectiveness of the designed strategy,comparative experiments were conducted with methods such as gain scheduling PI control in various wind scenarios.Results show that the proposed control strategy enables the floating offshore wind turbine to meet the stability of power generation while reducing the pitch motion of the floating platform,which can significantly reduce the fatigue damage of the floating offshore wind turbine.