直驱永磁同步风力发电机组的功率控制研究

发布时间：2018-11-21 14:54

【摘要】：在经济快速发展,能源需求日益短缺、环境极度恶化的现代社会,发展清洁可再生能源成为至关重要的人类课题。在诸多清洁能源中,风能以其清洁无污染、蕴含量大和无副作用等优点成为近年来国内外学者研究的热点。我国蕴含丰富的风能资源,主要集中在西北部和沿海地区,在风力发电领域具有广阔的发展前景,开发潜力巨大。论文以直驱永磁同步风力发电机组作为主要研究对象,对发电机输出有功功率控制进行深入的研究。论文首先对永磁同步风力发电机组的主要组成部分进行分析,阐释各部分的工作原理以及在系统中的作用和意义,根据各组成部分之间的联系进行数学建模。给出了双PWM模型,并在此基础上建立电机侧、电网侧的控制策略。为了改善风速变化给发电机输出功率所带来的影响,提出基于风力机变桨系统延时环节的Smith预估补偿的方法,设计了模糊+Smith预估控制器；再根据电压矢量控制的原则建立功率、电流双闭环的电机侧控制策略,通过设计滑模控制器和在线自调整准滑模控制器代替传统的PI控制来改善输出功率波动的问题。仿真结果表明,所设计的模糊Smith预估控制器以及在线自调整准滑模控制器对于抑制变化风速下功率波动具有很好的效果,改善了直驱同步发电机组的控制性能。
[Abstract]:With the rapid development of economy, the shortage of energy demand and the extreme deterioration of environment, the development of clean and renewable energy has become a crucial human issue. Among all the clean energy sources, wind energy has become a hot research topic in recent years because of its advantages of clean and pollution-free, large amount of energy and no side effects. China contains abundant wind energy resources, mainly concentrated in the northwest and coastal areas, has a broad development prospects in the field of wind power, development potential is huge. In this paper, the direct drive permanent magnet synchronous wind turbine is taken as the main research object, and the active power control of generator output is studied deeply. Firstly, the main components of permanent magnet synchronous wind turbine are analyzed, the working principle of each part and its function and significance in the system are explained, and the mathematical model is established according to the relationship between the components. The dual PWM model is presented, and the control strategy of motor side and power side is established on the basis of this model. In order to improve the influence of the wind speed change on the output power of the generator, the Smith predictive compensation method based on the delay link of the wind turbine variable propeller system is proposed, and the fuzzy Smith predictive controller is designed. According to the principle of voltage vector control, the power and current double closed loop motor side control strategy is established, and the problem of output power fluctuation is improved by designing sliding mode controller and on-line self-adjusting quasi-sliding mode controller instead of traditional PI control. The simulation results show that the fuzzy Smith predictive controller and the on-line self-adjusting quasi-sliding mode controller have good effect on restraining the power fluctuation under the varying wind speed and improve the control performance of the direct-drive synchronous generator set.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315

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