基于下垂控制的微电网运行控制研究

发布时间：2018-01-05 16:25

本文关键词：基于下垂控制的微电网运行控制研究　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：从人类的发展历史来看,能源始终是人类文明发展的阶梯,从早期的生物燃料,到后来煤炭石油等化石资源的应用,能源与我们的生活息息相关,可以说人类科技的进步离不开能源。基于下垂控制的微电网在孤岛运行和并网时有很多优势,它能更好的对微电源输出的频率和电压进行有效调节,使微电网拥有更好的稳定性,安全性,可靠性,并且不需要额外的通信手段。本文以传统下垂控制方式为基础,通过建立dq中的数学模型,对其电流电压环进行分析,然后指出传统下垂控制中,由于线路阻抗,会造成下垂传统下垂不稳定,产生环流等。为了改善微电源逆变器对线路的适应性,对传统下垂控制加入新型虚拟阻抗,该虚拟阻抗在低频呈感性,能很好的适应线路阻抗带来的问题。但是由于引入虚拟阻抗会对微电网的电压造成一定的减小,为了弥补引入虚拟阻抗带来的压降,根据电力系统线路电压降原理,引入电压补偿环节。然后在MATLAB中搭建加入虚拟阻抗和电压补偿的下垂控制两个并联的孤岛模型和并网模型,验证了加入虚拟阻抗后能起到优化功率分配,增加系统稳定性,减少功率环流的作用。随后基于DSP2812中对下垂控制主要部分的硬件和流程设计。
[Abstract]:From the history of human development, energy has always been the ladder of the development of human civilization. From the early biofuel to the later application of fossil resources such as coal oil, energy is closely related to our daily life. It can be said that the progress of human science and technology can not be separated from energy. Microgrid based on droop control has many advantages in island operation and grid connection, it can better adjust the frequency and voltage of micro-power output. The microgrid has better stability, security, reliability and no additional means of communication. Based on the traditional droop control method, the mathematical model of dq is established in this paper. The current and voltage loop is analyzed, and it is pointed out that in the traditional droop control, the traditional droop instability will be caused by the line impedance, and the circulation will be produced. In order to improve the adaptability of the micro-power inverter to the circuit. A new type of virtual impedance is added to the traditional droop control, which is inductive at low frequency, which can well adapt to the problems caused by line impedance. However, the introduction of virtual impedance will reduce the voltage of microgrid to a certain extent. In order to make up for the voltage drop caused by the introduction of virtual impedance, the principle of line voltage drop in power system is adopted. The voltage compensation link is introduced. Then the islanding model and grid-connected model of droop control with virtual impedance and voltage compensation are built in MATLAB. It is verified that virtual impedance can optimize power distribution, increase system stability and reduce power circulation. Then, the hardware and flow design of the main parts of droop control in DSP2812 is based on the design of hardware and flow chart.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727

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