双馈风力发电机运行特性及其热性能分析研究

发布时间：2018-01-17 02:28

本文关键词：双馈风力发电机运行特性及其热性能分析研究　出处：《南京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着常规能源日趋匮乏和环境问题的日趋严重,以风力发电为代表的新能源发电技术在全世界范围内正以前所未有的速度发展。风力发电系统根据发电机运行特点可以分为恒速恒频和变速恒频两种,其中变速恒频双馈风电机组具有可变速运行、灵活的转子交流励磁、变流器容量小和良好的功率调节能力等特性,是目前最广泛采用的风电机组类型之一。本文以双馈风电机组为主要研究对象,对其进行了运行原理分析、控制策略研究,并对作为其主要组成部件之一的双馈电机进行了深入的热性能分析、故障特性及寿命预测研究等,主要研究工作如下：首先介绍了双馈风电机组的运行原理,详细推导和建立了双馈风电机组各组成部件的数学模型,建立了基于定子磁链定向的双馈风力发电机矢量控制系统,实现了最大功率跟踪及有功、无功功率的解耦和独立控制。在Matlab/Simulink平台上搭建了系统仿真模型,研究了其在不同风速条件下的运行特性。仿真结果表明所搭建的模型具有良好的动态响应特性,能正确反映双馈风电机组内部各变量的关系。其次分析了双馈电机内部的损耗原理及温升机制,结合传热学理论,基于相似理论与电路理论搭建了集总参数法的双馈电机热网络模型,将其嵌套至双馈风电机组动态仿真模型中,研究电机组件的发热和冷却机制,并在风速变化条件下对电机定子绕组进行暂态和稳态的热性能分析研究。然后分别研究了电机冷却系统故障和电压不平衡故障的故障机理。基于所建立的模型,得到了这两种故障条件下电机的故障特性及电机的温升特性,并与实际风电场采集的SCADA数据进行比对分析,结果验证了所建立热网络模型及机理分析的合理与正确性。最后,研究了电机的寿命预测理论,分析了在正常运行工况及两种故障条件下电机的寿命变化情况。本文的研究为掌握双馈风力发电机的运行特性及其热性能、优化设计电机结构、新的故障诊断算法开发等方面提供了一定的理论依据和借鉴。
[Abstract]:With the increasing lack of conventional energy and environmental problems are becoming more and more serious. The new energy generation technology, represented by wind power generation, is developing at an unprecedented speed all over the world. According to the characteristics of generator operation, wind power generation system can be divided into constant speed constant frequency and variable speed constant frequency. The variable speed constant frequency doubly-fed wind turbine has the characteristics of variable speed operation, flexible rotor AC excitation, small converter capacity and good power regulation ability. It is one of the most widely used wind turbine types at present. In this paper, doubly-fed wind turbine is the main research object, the operation principle analysis and control strategy research are carried out. And as one of its main components of the doubly-fed machine for in-depth thermal performance analysis, fault characteristics and life prediction research, the main research work is as follows: first, introduced the operation principle of doubly-fed wind turbine. The mathematical model of the components of doubly-fed wind turbine is deduced and established in detail, and the vector control system of doubly-fed wind turbine based on stator flux orientation is established, which realizes the maximum power tracking and active power. Decoupling and independent control of reactive power. The system simulation model is built on Matlab/Simulink platform. The simulation results show that the model has good dynamic response characteristics. Can correctly reflect the relationship between the internal variables of the doubly-fed wind turbine. Secondly, the loss principle and temperature rise mechanism of the doubly-fed wind turbine are analyzed, combined with the theory of heat transfer. Based on the similarity theory and circuit theory, the thermal network model of doubly-fed wind turbine is built by lumped parameter method, which is nested into the dynamic simulation model of doubly-fed wind turbine, and the heating and cooling mechanism of motor components is studied. The transient and steady-state thermal performance of motor stator winding is analyzed under the condition of wind speed variation. Then the fault mechanism of motor cooling system fault and voltage imbalance fault are studied respectively based on the established model. The fault characteristics of the motor and the temperature rise characteristics of the motor under these two kinds of fault conditions are obtained and compared with the SCADA data collected by the actual wind farm. The results verify the rationality and correctness of the thermal network model and the mechanism analysis. Finally, the life prediction theory of the motor is studied. The variation of motor life under normal operating conditions and two kinds of faults is analyzed. In order to master the operation characteristics and thermal performance of the doubly-fed wind turbine, the structure of the motor is optimized. The development of new fault diagnosis algorithm provides some theoretical basis and reference.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM315

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