针对风力发电机组在额定风速以上运行时承受的不平衡载荷波动问题,提出了一种基于状态空间模型的独立变桨模型预测控制策略.首先基于风机仿真软件 FAST 对风电机组非线性系统线性化;然后将建立的线性时不变(LTI)模型与非线性风机系统对比验证预测模型的拟合度;最后建立 FAST-MATLAB联合仿真的 NREL5 MW风机模型,在湍流风模式下进行仿真.所提出的控制策略与传统 PI控制策略相比,在稳定功率的前提下有效地减少了不平衡载荷,提高了风电机组运行稳定性.
Study on Model Predictive Individual Pitch Control of Wind Turbine for Load Shedding
Wind turbines are subjected to fluctuated unbalanced load when operating under wind speed above specified value.In view of this,the present work studied an model-predictive individual pitch control strategy based on state space models.First the nonlinear system of wind turbines was linearized using wind turbine simulation software FAST.Then the goodness-of-fit of the model were determined by comparatively analyzing the established linear time invariant(LTI)model with nonlinear fan system.Finally a simulation was carried out under turbulent wind mode on a NREL5 MW wind turbine model established jointly using FAST and MATLAB.The proposed control strategy can achieve reduced load imbalance while maintaining stable power output compared with conventional PI control strategies,thus improving stability of wind turbine.
NETL
NSTL
万方数据
