双馈风力发电系统的运行与功率控制研究

发布时间：2018-03-25 03:29

本文选题：风力发电　切入点：双馈电机　出处：《哈尔滨理工大学》2015年硕士论文

【摘要】：全球经济发展带来了巨大的能源需求，传统的能源供应已经很难满足需求并且也会带来雾霾等环境问题。寻找新型环保优质能源已经成为当下的热门课题。风能作为广泛存在于自然界的能量，其可再生性、无污染性和巨大的含量等优点已经被人们接受并且引起了重视。我国幅员辽阔，地理位置优越，具有丰富的风能资源，并且已经建立了很多的风力发电厂。在风电系统安装的电机类型中，双馈式感应电机(Doubly Fed InductionGenerator,简称DFIG)具有的功率可调和变速恒频运行等优点使其已经成为目前主流机型之一。本文通过对双馈式异步发电机的数学模型进行分析，经过坐标变换得到dq两相旋转坐标系下的简化模型。对风力机实现最大风能追踪的能力进行分析，并根据风力机的物理模型，经过计算，推导出以最大风能追踪为目标的风力机控制系统。对双馈式异步风力发电机的交-直-交变换器进行理论分析，通过选取不同的控制策略实现系统的有功功率和无功功率解耦控制，以实现最大风能跟踪运行。通过Matlab/Simulink软件对双馈式风力发电系统中的风机、电机和控制部分分别进行建立仿真模型，并对其进行仿真分析。通过对仿真结果分析可知，本文采取的控制策略可以很好地实现有功、无功功率解耦，可以根据系统变化实时改变有功功率和无功功率参考值从而适应风速的变化实现最大风能追踪。在电网电压波动的情况下，本文采取的控制策略能快速响应，控制系统的无功功率变化，，减小因电压波动对系统稳定运行带来的影响。
[Abstract]:Global economic development has brought huge energy needs, Traditional energy supply has been difficult to meet the demand and will bring environmental problems such as haze. Looking for new environmental protection and high quality energy has become a hot topic. Wind energy, as an energy widely existing in nature, is renewable. The advantages of pollution-free and huge content have been accepted and paid attention to. China has a vast territory, superior geographical location, rich wind energy resources, and has established a lot of wind power plants. Among the motor types installed in wind power system, doubly-fed induction motor (DFIGM) has become one of the mainstream models because of its power and variable speed constant frequency operation. In this paper, the mathematical model of doubly-fed asynchronous generator is analyzed, and the simplified model in dq two-phase rotating coordinate system is obtained by coordinate transformation. The ability of wind turbine to track maximum wind energy is analyzed. According to the physical model of wind turbine, a wind turbine control system aiming at maximum wind energy tracking is deduced through calculation. The AC-DC-AC converter of doubly-fed asynchronous wind turbine is analyzed theoretically. The decoupling control of active and reactive power is realized by selecting different control strategies to realize the maximum wind power tracking. The simulation model of fan, motor and control part in doubly-fed wind power generation system is established by Matlab/Simulink software, and the simulation analysis is carried out. The control strategy adopted in this paper can realize the decoupling of active and reactive power. The reference value of active power and reactive power can be changed in real time according to the change of system, and the maximum wind energy tracking can be realized according to the change of wind speed. In the case of voltage fluctuation of power network, the control strategy adopted in this paper can respond quickly. The reactive power of the system is controlled to reduce the influence of voltage fluctuation on the stable operation of the system.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM614

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