液压型落地式风力发电机组谐振机理与抑制控制研究

Hydraulic type floor-wind turbine adopts the floor installation of variable motor and generator and control systems with long hydraulic pipelines, which reduces the weight of the cabin and gets easier installation and maintenance. On the one hand, long hydraulic pipelines improves the advantage of flexible transmission. On the other hand, it changes the coupling resonance rule and rule of the system state controlled unit. In the wind excitation frequencies, wind turbine and hydraulic system prone to coupling resonance problem., more worse, it will lead to the unstability. So harmonic suppression problems become one of the problems to be solved of this type of wind turbine. This project intends to carry out the following research for this problem: (1) Under the condition of long pipes, multidisciplinary mechanism of nonlinear coupling vibration of the Hydraulic unit is studied. From the angle of vibration modal analysis we study the influencing laws of input to the resonant characteristics. (2) We establis the coupling dynamic model ,which considering vibration characteristics of multidisciplinary nonlinear. From the perspectives of controlled movement,we analyse the mechanism of this system with strong time-varying, high order time, multivariable, nonlinear and strong coupling, explore the decoupling method, study the influence law of the state variables which reflects the resonance of the unit because of input. (3) We set up a comprehensive capture transfer energy conversion system harmonic suppression control strategy, taking the high wind energy use efficiency, power quality and unit based control function (Quasi-synchronizing parallel control, power control and optimal power tracking control) into consideration.

液压型落地式风力发电机组采用液压长管路实现变量马达、发电机及其控制系统的落地安装，降低了机舱重量，便于安装维护。液压长管路，一方面发扬了液压柔性传动的优势，另一方面改变了机组谐振规律和系统状态受控规律，在风的激励频段内风力机与液压系统容易产生谐振，严重时将引起机组失稳，所以谐振抑制成为该机型亟待解决的关键问题之一。本项目针对上述问题拟开展以下研究：(1)机组液压长管路条件下多学科非线性耦合振动机理研究，从振动模态分析角度研究机组控制输入对谐振特性的影响规律。(2)建立机组考虑振动特性的多学科非线性耦合动力学模型，从受控运动角度分析机组强时变、高阶次、多变量、非线性、强耦合机理，探索解耦方法，研究系统谐振状态变量对解耦控制输入变量响应规律。(3)建立机组能量捕获传输转换系统谐振抑制综合控制策略，兼顾电能质量、高风能利用效率和机组基础控制功能(准同期并网控制、发电功率控制与最佳功率追踪控制)。

液压型落地式风力发电机组采用液压长管路实现变量马达、发电机及其控制系统的落地安装，在风的激励频段内风力机与液压系统容易产生谐振。本项目针对带长管路液压系统谐振机理及谐振抑制方法展开研究，进行了以下研究及创新：1）建立了液压长管路分布参数模型，通过分析系统压力、流量传输规律揭示了机组液压长管路条件下多学科非线性振动机理，得到了机组振动模态的影响因素及各因素对振动模态的影响规律；2）建立了系统动力学模型，通过分析风力机转速波动和液压系统压力波动得到了整机振动特性，并且得到了马达摆角对风力机转速和系统压力波动的作用规律；3）针对风电机组振动特性，求解得到系统在不同风频激励下机组谐振频率，得到了液压系统谐振的马达摆角控制策略。. 项目期间共在国内外权威期刊上公开发表论文18篇，其中 EI 或者 SCI 检索的论文5篇，申请发明专利8项，其中授权4项，公开4项，授权实用新型专利1项，培养硕士研究生6名。