孤网模式下双馈风机稳定控制策略研究

发布时间：2018-07-20 19:20

【摘要】：“雾霾之上、穹顶之下,我们同呼吸、共命运”,雾霾调查片——《穹顶之下》,引爆了公众对雾霾的关注和讨论。近年来,经济的腾飞、化石燃料消耗的猛增,引发了一系列的环境问题。风力发电作为新能源开发利用的主力军之一,愈加收到各国能源界的重视。本文主要研究内容主要包括两方面:双馈风机孤岛启动和运行、风电场孤岛直流外送。(1)双馈风机孤岛启动和运行:阐述了双馈风机孤岛运行的工作机理、风机启动控制策略。根据双馈发电机的数学模型,在强迫定向的定子磁场控制策略的基础上,改造DFIG励磁变频器控制策略,实现孤岛下双馈风机恒压恒频运行。并在Matlab/Simulink中搭建了双馈风机的孤岛启动、运行的仿真模型并进行实验,通过观测双馈风机定子侧功率输出、转子电流波形、电磁转矩波形、电容电压等关键变量的波形,进行验证双馈风机控制效果。(2)风电场孤岛直流外送:分析孤立双馈风电场的特高压直流外送系统运行时所面临的问题,建立暂态不平衡功率的消除机制、根据暂态不平衡功率的特征量的变化,提出特高压直流系统的控制策略,消除特高压直流系统与双馈风电场间的不平衡功率。通过DSP、RTDS仿真器进行联合仿真,验证所设计的控制策略,实验表明控制效果良好。文中最后针对两种孤岛系统的工作情况,并指出了该系统中存在的仍需改进的地方,同时也指明了后续研究的方向。
[Abstract]:"above haze, under the dome, we breathe together," the haze investigation film, under the Dome, ignited public attention and discussion of haze. In recent years, the rapid development of economy and the rapid increase of fossil fuel consumption have caused a series of environmental problems. Wind power generation, as one of the main force of new energy development and utilization, has been paid more and more attention by the energy community of various countries. This paper mainly includes two aspects: starting and running of isolated island of doubly-fed fan and DC sending out of isolated island of wind farm. (1) Start-up and operation of isolated island of doubly-fed fan. According to the mathematical model of doubly-fed generator, the control strategy of DFIG excitation inverter is modified on the basis of the forced directional stator magnetic field control strategy, and the constant voltage and constant frequency operation of doubly-fed fan under isolated island is realized. In Matlab / Simulink, a simulation model for the isolated start and operation of a doubly-fed fan is built and tested. The waveform of key variables, such as stator power output, rotor current waveform, electromagnetic torque waveform, capacitance voltage and so on, is observed. The control effect of doubly-fed blower is verified. (2) isolated island DC outputting in wind farm is analyzed, and the problem of UHV DC outputting system in isolated doubly-fed wind farm is analyzed, and the mechanism of eliminating transient unbalanced power is established. According to the change of the characteristic of transient unbalanced power, the control strategy of UHV DC system is proposed to eliminate the unbalanced power between UHV DC system and doubly-fed wind farm. Through the simulation of DSP RTDS simulator, the designed control strategy is verified. The experimental results show that the control effect is good. In the end of this paper, the working conditions of the two isolated island systems are pointed out, and some improvements in the system are pointed out. At the same time, the direction of further research is pointed out.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM614

【相似文献】