针对直驱式永磁同步风力发电系统风速多变、非线性和强扰动的问题,提出一种基于模糊控制和线性自抗干扰控制(Linear Active Disturbance Retection Control,LADRC)的混合控制方法。首先对线性自抗扰中的扩张状态观测器(Linear Extended ...针对直驱式永磁同步风力发电系统风速多变、非线性和强扰动的问题,提出一种基于模糊控制和线性自抗干扰控制(Linear Active Disturbance Retection Control,LADRC)的混合控制方法。首先对线性自抗扰中的扩张状态观测器(Linear Extended State Observer,LESO)进行改进,提高对扰动观测的能力,同时利用模糊控制动态调整LADRC控制参数,增强系统的抗干扰能力和鲁棒性。仿真结果表明,与传统PI控制器相比,该方法能够更好地估计风速引起的转矩波动,准确跟踪额定转速,实现风能利用最大化。展开更多
针对故障情景下风电场等值模型精度偏低的问题,提出了一种考虑低压穿越(low voltage ride through,LVRT)功率特性的风电场多机聚合辨识等值建模方法。首先,基于风电机组LVRT期间有功功率动态特性的典型差异对风电场进行初次分群。其次,...针对故障情景下风电场等值模型精度偏低的问题,提出了一种考虑低压穿越(low voltage ride through,LVRT)功率特性的风电场多机聚合辨识等值建模方法。首先,基于风电机组LVRT期间有功功率动态特性的典型差异对风电场进行初次分群。其次,采用基于动态时间规整(dynamic time warping,DTW)度量的多路谱聚类(Ng-Jordan Weiss,NJW)算法实现机群的二次划分,得到最终两阶段分群结果。然后,针对聚合所得的风电场多机等值模型,采用参数灵敏度分析方法来确定需要优化的重点参数,以各参数聚合值为初值,同时结合单机分步辨识、多机依次辨识以及等值阻抗辨识3种策略,实现风电场整体等值参数的优化。最后,对比了不同方法的拟合曲线及等值误差,结果表明所提方法有效提高了等值模型的精确性与适应性。展开更多
A novel fault ride-through strategy for wind turbines,based on permanent magnet synchronous generator,has been proposed.The proposed strategy analytically formulates the reference current signals,disregarding grid fau...A novel fault ride-through strategy for wind turbines,based on permanent magnet synchronous generator,has been proposed.The proposed strategy analytically formulates the reference current signals,disregarding grid fault type and utilizes the whole system capacity to inject the reactive current required by grid codes and deliver maximum possible active power to support grid frequency and avoid generation loss.All this has been reached by taking the grid-side converter’s phase current limit into account.The strategy is compatible with different countries’grid codes and prevents pulsating active power injection,in an unbalanced grid condition.Model predictive current controller is applied to handling rapid transients.During faults,the energy storage system maintains DC-link voltage,which causes voltage fluctuations to be eliminated,significantly.A fault ride-through strategy was proposed for PMSG-based wind turbines,neglecting fault characteristics,second,reaching maximum possible grid support in faulty grid conditions,while avoiding over-current and third,considerable reduction in energy storage system size and power rating.Inspiring simulations have been carried out through MATLAB/SIMULINK to validate the feasibility and competency of the proposed fault ride-through method and efficiency of the entire control system.展开更多
文摘针对直驱式永磁同步风力发电系统风速多变、非线性和强扰动的问题,提出一种基于模糊控制和线性自抗干扰控制(Linear Active Disturbance Retection Control,LADRC)的混合控制方法。首先对线性自抗扰中的扩张状态观测器(Linear Extended State Observer,LESO)进行改进,提高对扰动观测的能力,同时利用模糊控制动态调整LADRC控制参数,增强系统的抗干扰能力和鲁棒性。仿真结果表明,与传统PI控制器相比,该方法能够更好地估计风速引起的转矩波动,准确跟踪额定转速,实现风能利用最大化。
文摘针对故障情景下风电场等值模型精度偏低的问题,提出了一种考虑低压穿越(low voltage ride through,LVRT)功率特性的风电场多机聚合辨识等值建模方法。首先,基于风电机组LVRT期间有功功率动态特性的典型差异对风电场进行初次分群。其次,采用基于动态时间规整(dynamic time warping,DTW)度量的多路谱聚类(Ng-Jordan Weiss,NJW)算法实现机群的二次划分,得到最终两阶段分群结果。然后,针对聚合所得的风电场多机等值模型,采用参数灵敏度分析方法来确定需要优化的重点参数,以各参数聚合值为初值,同时结合单机分步辨识、多机依次辨识以及等值阻抗辨识3种策略,实现风电场整体等值参数的优化。最后,对比了不同方法的拟合曲线及等值误差,结果表明所提方法有效提高了等值模型的精确性与适应性。
文摘A novel fault ride-through strategy for wind turbines,based on permanent magnet synchronous generator,has been proposed.The proposed strategy analytically formulates the reference current signals,disregarding grid fault type and utilizes the whole system capacity to inject the reactive current required by grid codes and deliver maximum possible active power to support grid frequency and avoid generation loss.All this has been reached by taking the grid-side converter’s phase current limit into account.The strategy is compatible with different countries’grid codes and prevents pulsating active power injection,in an unbalanced grid condition.Model predictive current controller is applied to handling rapid transients.During faults,the energy storage system maintains DC-link voltage,which causes voltage fluctuations to be eliminated,significantly.A fault ride-through strategy was proposed for PMSG-based wind turbines,neglecting fault characteristics,second,reaching maximum possible grid support in faulty grid conditions,while avoiding over-current and third,considerable reduction in energy storage system size and power rating.Inspiring simulations have been carried out through MATLAB/SIMULINK to validate the feasibility and competency of the proposed fault ride-through method and efficiency of the entire control system.
