基于滑模控制的变速恒频双馈风力发电机控制策略研究

发布时间：2018-10-09 21:37

【摘要】：从可持续发展的观点来看,人类当前依靠的化石能源终将枯竭,寻找可替代传统发电方式的新能源成为当务之急,世界各国都把开发和利用可再生能源作为人类可持续发展和本国能源战略的重点。风能作为一种取之不尽、用之不竭、环境友好的清洁可替代能源,使得风力发电成为目前新能源发电技术中最为成熟、开发规模最大、商业化发展最好的发电方式。风能已成为我国电力系统增长最快的绿色能源和全球发展最快的可再生能源。首先,本文对变速恒频发电技术做出简明介绍,详细阐述了交流励磁双馈式风力发电机组的基本结构和工作原理,对变速恒频双馈风力发电机组的运行区域及控制策略做出了具体分析；其次,建立了DFIG在三相静止坐标系下的数学模型,并在系统阐述坐标变换理论的基础上,得到两相同步旋转坐标系下的DFIG数学模型；然后,在对滑模变结构控制理论的特点和发展史做出概述后,详细叙述了滑模变结构控制的基本原理,并特别对Terminal滑模变结构控制和等效滑模控制做出具体的理论阐述；最后,推导了双馈发电机在定子电压定向情形下的矢量控制系统数学模型,并在理论上进行了控制系统内各控制器的设计、在计算机上进行了仿真实验。
[Abstract]:From the point of view of sustainable development, the fossil energy that mankind relies on at present will be exhausted, so it is urgent to find new energy that can replace the traditional power generation. The development and utilization of renewable energy is regarded as the key point of sustainable development and national energy strategy in the world. Wind energy as an inexhaustible, environmentally friendly clean alternative to energy, wind power generation has become the most mature new energy generation technology, the largest scale of development, commercial development of the best way of power generation. Wind energy has become the fastest growing green energy in China's power system and the fastest growing renewable energy in the world. Firstly, the technology of variable speed constant frequency power generation is introduced in this paper, and the basic structure and working principle of AC excitation doubly-fed wind turbine are described in detail. The operation area and control strategy of variable speed constant frequency doubly-fed wind turbine are analyzed concretely. Secondly, the mathematical model of DFIG in three-phase static coordinate system is established, and the coordinate transformation theory is expounded systematically. The DFIG mathematical model in two-phase synchronous rotating coordinate system is obtained. Then, after summarizing the characteristics and history of sliding mode variable structure control theory, the basic principle of sliding mode variable structure control is described in detail. In particular, the theory of Terminal sliding mode variable structure control and equivalent sliding mode control is expounded. Finally, the mathematical model of vector control system of doubly-fed generator under stator voltage orientation is derived. The controller of the control system is designed in theory, and the simulation experiment is carried out on the computer.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315

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