【作者】 彭朝亮；

【导师】 谭永东；

【作者基本信息】 西南交通大学 ， 电气工程， 2011， 硕士

【摘要】 风力发电技术的研究被日益重视,它采用风轮机直接驱动永磁同步发电机,通过功率变换器进行电能转换后并网,省去了故障频出的齿轮箱,同时低压穿越能力明显提高,提高了效率,因此,直驱型风力发电是风电技术发展的重要方向。但由于全功率变流器须承载全部电能,随着风力发电单机容量的提高,全功率变流器容量的提高将成为风电变流技术研究的重点,达到提高变流器容量,保障大功率变流器的稳定高效运行,为电网提供高质量电能的目标,对风电事业的发展具有深远的影响。论文以实现以通过载波相移技术应用于大功率变流器,实现全功率变流器大容量化为目标,开展了以下工作：首先介绍国内外风电行业的发展史及现状,重点分析风电变流器的现状及发展趋势,总结出提高变流器容量的可行方案,着重阐述了并联技术的研究现状,表明并联技术提高变流器容量的可行性。其次,分析六相双绕组永磁同步电机的数学模型,阐述风力的数学模型,搭建了永磁同步电机直接连接风力的仿真模型,阐述了永磁同步电机的零d轴空制策略。建立六相永磁同步电机的仿真模块。第三,分析比较几种大功率变流器调制策略,着重研究载波相移正弦脉宽调制和相移电压空间矢量调制两种优秀的大功率变流技术调制策略。并基于MATLAB/SIMULINK调制出两种调制策略的波形。最后,重点研究并联PWM背靠背式变流器的拓扑结构及运行工况,着重分析了并联条件下的机侧、网侧变流器数学模型,给出了电压外环电流内环的双闭环机侧变流器控制策略,网侧变流器采用电压电流双环控制策略。在此基础上搭建两种脉宽调制策略下的仿真模型,针对性比较两种仿真结果,验证两种大功率调制策略的优缺点。将载波相移技术运用于脉宽调制中,实现脉宽调制在功率变流技术场合的应用,通过仿真实验,验证课题研究的可行性。更多还原

【Abstract】 Wind power technology has been increasingly emphasized on research, which uses a wind turbine directly to drive permanent magnet synchronous motor, Converts electricity to grid through power converter, eliminates the frequent failure gear box, what’s more, improves the low pressure through ability and enhances efficiency significantly. Therefore, direct drive wind power generation is an important direction in wind power technology. However, full power converter carrying all the power. With the capacity of stand-alone wind power increasing, to the improvement of the full power converter capacity will be the focus of the study in wind power converter technology, the goal is to improve the capacity of the converter, protect the power converter operating stably and efficiently, to provide high-quality power to the grid, which has a profound impact the development of wind power.This paper applied the phase shift carrier technology in high-power converter, to achieve the capacity of full power converter increase, unfolded the following work:The paper introduced the development of domestic wind power industry history and current situation, the focus of wind power converter status and development trends, summed up the converter to improve the capacity of viable options, focusing on the status of technology research in parallel, indicating that the parallel technology to improve converter capacity is feasible.Secondly, it analyzed the mathematical model of 6-phase permanent magnet synchronous motor and the wind turbine, built the directly connection simulation model of the wind turbine and permanent magnet synchronous motor. Additionally, explained the permanent magnet synchronous motor zero d-axis air strategy and.Verified the effectiveness of the control strategy.Thirdly, it analyzed and compared several high-power converter modulation strategy, focused on Carrier Phase Shifted SPWM and Carrier Phase Shifted SVM modulation, which are outstanding high-power converter technology modulation strategy. In addition, the paper modulated waveform via two modulation strategies basing on MATLAB/SIMULINK.Finally, the paper focused on the parallel back-to-back PWM converters topology and operating conditions, Researched grid-side converter and generator-side converter model of the parallel back-to-back PWM converters, generator-side converter was applied the inner current loop and outer voltage loop control strategy, network-side converter used voltage and current double-loop for Decoupled Active and Reactive Power control strategy. On this basis, two kinds pulse width modulation simulation model was built, and compared two simulation results, verified the advantages and disadvantages of each high-power modulation strategy. For Carrier Phase-Shifting Technique being used in Pulse Width Modulation, achieved an aim application of pulse width modulation in High-Power Converter technology occasions. The simulation waveform verified feasibility of the study.更多还原