（毕业设计论文）《电网波动下并网逆变器控制仿真》.docVIP

PAGE 摘 要 近年来，由于能源紧缺、环境污染和电力需求的迅速增长，人们越来越重视可再生能源的发展和能源的循环利用，如太阳能发电和电子负载等都是典型的应用，其中并网逆变器是它们的核心技术，进而成为了目前各国主要研究的热点课题。在对并网逆变器各控制方法分析的基础上，本文对在电网波动情况下并网逆变控制方案进行了探索研究。 论文首先介绍了现如今的电网电能质量问题，对影响并网工作的各种电能质量问题进行了分类总结，对谐波产生的原因进行了阐述，并着重研究了电网电压波动对并网逆变的影响。然后，具体分析了并网逆变器的组成和工作原理，对逆变器的各种拓扑结构和功能进行了详细的分析。并对电网波动对并网逆变的影响进行了仿真分析验证，得出了电网波动对并网逆变影响比较大。 在此背景上本文提出了将电压前馈和零误差电流跟踪相结合抑制电网扰动的方法。首先在分别对两种方法理论分析基础上，详细分析了两种方法的优点和欠缺，推导了此控制方法的传递函数，进行了频率特性分析，论证了两种方法结合一起的控制方法的可行性和优势，并详尽阐述了此控制方法对抑制电网扰动的作用。 最后根据设计的方案在MATLAB上搭建了具体的仿真模型，对PI调节器、电压前馈和零误差电流跟踪方法各部分的作用都进行了分析验证。同时，对各种仿真结果进行了分析，验证了理论分析的结果，说明了此控制策略对抑制电网波动的有效性。 关键词：并网逆变；电网波动；电压前馈；零误差电流跟踪；扰动抑制 Abstract Because of the lack of energy, evironment pollution and increasing demand of electric power, people have pay more and more attention to the development of renewable energy and recycling use of electric power. Solar power and electronic load are the typical applications, in which grid inverter is their core technology. So grid inverter become a hot topic of study. Based on the analysis of each grid inverter control method, this paper take much effort in grid inverter under the power fluctuations. Paper first introduces the present power quality problems today, classify a variety of power quality problems that affect the work, describe the causes of the harmonic generation, and focus on the effect of harmonic generation to the grid inverter. Then particularly analysis the structure, function and theory of grid inverter. And simulate the power fluctuations’ effect to the grid inverter, the effect is obvious. Under this background, this paper raised the voltage feed-forward and zero tracking error current combination method to inhibite power grid disturbances. First analysis each method, describe the advantages and lackness, derived the transfer function of this control method, and analysis Frequency Characteristics, demonstrates the feasibility and advantages of the combination of two methods, and describe this control method on the role of inhibition of