微电网逆变器运行控制策略的研究

发布时间：2018-05-15 09:59

  本文选题：微电网 + 微电源逆变器　； 参考：《燕山大学》2016年硕士论文

【摘要】：当前,常规能源短缺、环境保护和电力需求增长给可再生能源分布式发电相关的技术发展带来了机遇。微电网可以综合各种分布式电源,对其进行协调控制,并可以运行在独立和并网两种模式。微电网能够有效解决大量分布式电源接入而产生的诸多问题,充分利用分布式发电的优势,提高电能质量和供电可靠性。微电网中的各类微电源和储能装置通常通过电力电子器件组成的逆变器连接到网络,因此微电源逆变器的控制策略的研究对微电网安全稳定具有重要意义。本文以微电网中微电源逆变器为研究对象,对其运行及控制策略进行了深入研究。首先,阐述微电网并网运行和孤岛运行两种模式,并分析了恒功率控制、恒压恒频控制、下垂控制的基本原理。其次,基于三相微电源逆变系统的拓扑结构,建立数学模型,并研究设计微电源逆变器下垂控制系统。该控制系统采用基于模糊PI控制器的电压电流双闭环控制方案,大大提升了对微电网的控制效果。最后,基于单相微电源并网逆变系统,考虑系统模型存在的不确定因素和干扰项,研究提出了H∞鲁棒控制策略,并运用LMI的方法设计并求解控制器,使微电网不仅能够稳定运行,同时有很好的干扰抑制能力。最后,搭建Matlab/Simulink仿真模型对理论方法进行了仿真验证。
[Abstract]:At present, the shortage of conventional energy, environmental protection and the growth of electricity demand bring opportunities for the development of renewable energy distributed power generation technology. Microgrid can integrate various distributed power sources, coordinate and control them, and can run in two modes: independent and grid-connected. Microgrid can effectively solve many problems caused by the access of a large number of distributed power sources, make full use of the advantages of distributed generation, and improve the power quality and power supply reliability. All kinds of micro-power and energy storage devices in microgrid are usually connected to the network by inverter composed of power electronic devices. Therefore, the study of control strategy of micro-power inverter is of great significance to the safety and stability of micro-grid. In this paper, the operation and control strategy of micro-power inverter in microgrid is studied. Firstly, the two modes of microgrid grid-connected operation and islanding operation are described, and the basic principles of constant power control, constant voltage and frequency control and droop control are analyzed. Secondly, based on the topology of three-phase micro-power inverter system, the mathematical model is established, and the droop control system of micro-power inverter is designed. The control system adopts the double closed loop control scheme of voltage and current based on fuzzy Pi controller, which greatly improves the control effect of microgrid. Finally, based on the single-phase micro-power grid-connected inverter system, considering the uncertainties and disturbances in the system model, the H _ 鈭，

本文编号：1891999