齿轮箱故障是风力机常见的问题。通过B laded for windows软件,产生在不同风速下兆瓦级变桨距风力机组齿轮箱的各项参数,根据风场的风频,得到载荷谱,从而实现齿轮箱齿轮、轴的设计优化和轴承的最优选择,最终提高齿轮箱的整体寿命和结构...齿轮箱故障是风力机常见的问题。通过B laded for windows软件,产生在不同风速下兆瓦级变桨距风力机组齿轮箱的各项参数,根据风场的风频,得到载荷谱,从而实现齿轮箱齿轮、轴的设计优化和轴承的最优选择,最终提高齿轮箱的整体寿命和结构的合理性。展开更多
风速的随机性和风电机组控制系统的非线性导致难以获取风电机组精确的数学模型。鉴于实际的风电工程通常采用简单的比例-积分-微分(proportional integral differential,PID)控制器或比例-积分(proportional integral,PI)控制器达到输...风速的随机性和风电机组控制系统的非线性导致难以获取风电机组精确的数学模型。鉴于实际的风电工程通常采用简单的比例-积分-微分(proportional integral differential,PID)控制器或比例-积分(proportional integral,PI)控制器达到输出恒定功率的控制目标,不涉及复杂的智能控制算法,在风速高于额定风速时,提出了一种基于加性分解原理的方法来规范风力发电机组变桨控制器的设计参数,将风力发电机组变桨控制问题分解为2个简单的子问题,即线性时不变主系统的追踪问题和辅系统的镇定问题。基于该原理,设计出了简单的PI控制器,并在此基础上进行了控制器优化设计,而且通过理论推导给出了该控制器的稳定性证明,最后通过仿真验证优化后的控制器能够大大增加输出功率的平稳性。这将为今后设计风力发电机组变桨控制器设计提供一定的准则。展开更多
Collective pitch control and individual pitch control algorithms were present for straight-bladed vertical axis wind turbine to improve the self-starting capacity.Comparative analysis of straight-bladed vertical axis ...Collective pitch control and individual pitch control algorithms were present for straight-bladed vertical axis wind turbine to improve the self-starting capacity.Comparative analysis of straight-bladed vertical axis wind turbine(SB-VAWT) with or without pitch control was conducted from the aspects of aerodynamic force,flow structure and power coefficient.The computational fluid dynamics(CFD) prediction results show a significant increase in power coefficient for SB-VAWT with pitch control.According to the aerodynamic forces and total torque coefficient obtained at various tip speed ratios(TSRs),the results indicate that the blade pitch method can increase the power output and decrease the deformation of blade;especially,the total torque coefficient of blade pitch control at TSR 1.5 is about 2.5 times larger than that of fixed pitch case.Furthermore,experiment was carried out to verify the feasibility of pitch control methods.The results show that the present collective pitch control and individual pitch control methods can improve the self-starting capacity of SB-VAWT,and the former is much better and its proper operating TSRs ranges from 0.4 to 0.6.展开更多
文摘风速的随机性和风电机组控制系统的非线性导致难以获取风电机组精确的数学模型。鉴于实际的风电工程通常采用简单的比例-积分-微分(proportional integral differential,PID)控制器或比例-积分(proportional integral,PI)控制器达到输出恒定功率的控制目标,不涉及复杂的智能控制算法,在风速高于额定风速时,提出了一种基于加性分解原理的方法来规范风力发电机组变桨控制器的设计参数,将风力发电机组变桨控制问题分解为2个简单的子问题,即线性时不变主系统的追踪问题和辅系统的镇定问题。基于该原理,设计出了简单的PI控制器,并在此基础上进行了控制器优化设计,而且通过理论推导给出了该控制器的稳定性证明,最后通过仿真验证优化后的控制器能够大大增加输出功率的平稳性。这将为今后设计风力发电机组变桨控制器设计提供一定的准则。
基金Project (E201216) supported by Heilongjiang Provincial Natural Science Foundation,China
文摘Collective pitch control and individual pitch control algorithms were present for straight-bladed vertical axis wind turbine to improve the self-starting capacity.Comparative analysis of straight-bladed vertical axis wind turbine(SB-VAWT) with or without pitch control was conducted from the aspects of aerodynamic force,flow structure and power coefficient.The computational fluid dynamics(CFD) prediction results show a significant increase in power coefficient for SB-VAWT with pitch control.According to the aerodynamic forces and total torque coefficient obtained at various tip speed ratios(TSRs),the results indicate that the blade pitch method can increase the power output and decrease the deformation of blade;especially,the total torque coefficient of blade pitch control at TSR 1.5 is about 2.5 times larger than that of fixed pitch case.Furthermore,experiment was carried out to verify the feasibility of pitch control methods.The results show that the present collective pitch control and individual pitch control methods can improve the self-starting capacity of SB-VAWT,and the former is much better and its proper operating TSRs ranges from 0.4 to 0.6.
