适用于直流微网的动态电压恢复器研究

发布时间：2018-03-31 13:25

本文选题：直流微电网　切入点：直流动态电压恢复器　出处：《上海电力学院》2017年硕士论文

【摘要】：直流微电网作为连接分布式电源和电网的一种方式,重构能力强,电能质量高,能够高效的利用分布式能源,是未来分布式发电应用的一种趋势。在电能质量问题及其治理方面,直流微电网作为新型低压直流配电网,拥有诸多新特点,其中电压暂降、跌落和骤升问题是当前直流微电网中常出现的电能质量问题,影响日常用电,需采取有效措施,维持微电网的稳定运行,保证负荷供电质量。本文总结了当前直流微电网系统结构、电压等级等基本特征,直流微电网中存在的电压暂降、跌落等电能质量问题,以及当前国内外低压直流配电系统的直流电能质量标准和电能质量问题的治理措施。在深入研究当前交流微电网动态电压恢复器的基础上,提出适用于直流微电网的直流动态电压恢复器,改善直流微电网电压质量。基于直流系统的特点,本文设计的单向直流动态电压恢复器拓扑采用隔离型高频直—交—直结构,能够实现大范围电压跌落补偿,提高系统的安全性,减小设备的体积。针对单向直流动态电压恢复器的隔离型高频直—交—直拓扑结构,本文研究了直流电压检测算法、电压补偿法,以及系统控制器的控制算法,其中电压检测算法采用基于外推预测的直流电压检测算法,可提升系统的动态响应速度;电压补偿法采用直流电压全补偿法;控制器采用基于有源阻尼的电压环、电流环双闭环比例积分控制,保证了系统的响应速度和输出的稳态精度,系统动态和稳态特性较好。在MATLAB/Simulink软件平台上搭建了单向直流动态电压恢复器的仿真模型,并基于DSPACE1005控制器搭建了2kW的实验平台,最终的仿真和实验结果验证了拓扑的正确性和控制算法的有效性。最后,本文在单向直流动态电压恢复器拓扑的基础上进行改进,提出双向直流动态电压恢复器,解决直流微电网的电压骤升、电压暂降和跌落等问题。基于拓扑设计了相应的电压检测、判断算法,以及控制器的复合控制算法。并在MATLAB/Simulink软件平台中搭建了仿真模型,验证所提理论的正确性。
[Abstract]:As a way of connecting distributed generation and power grid, DC microgrid has strong reconfiguration ability, high power quality, and can utilize distributed energy efficiently. As a new type of low-voltage DC distribution network, DC microgrid has many new characteristics, including voltage sag. The problem of drop and sudden rise is a common power quality problem in the current DC microgrid, which affects the daily electricity consumption, so it is necessary to take effective measures to maintain the stable operation of the microgrid. This paper summarizes the basic characteristics of the current DC microgrid system, such as the structure of the DC microgrid system, voltage grade, and other power quality problems such as voltage sag and voltage sag in the DC microgrid. And the current domestic and foreign low-voltage DC distribution system DC power quality standards and power quality measures. Based on in-depth study of the current AC microgrid dynamic voltage restorer, A DC dynamic voltage restorer suitable for DC microgrid is proposed to improve the voltage quality of DC microgrid. Based on the characteristics of DC system, the unidirectional DC dynamic voltage restorer designed in this paper adopts the isolated high-frequency direct-AC structure. It can realize wide range voltage drop compensation, improve the security of the system and reduce the volume of the equipment. In this paper, the DC voltage detection algorithm is studied for the isolated high-frequency direct-AC direct topology of unidirectional DC dynamic voltage restorer. Voltage compensation method and control algorithm of system controller, in which the voltage detection algorithm adopts DC voltage detection algorithm based on extrapolation prediction, which can improve the dynamic response speed of the system, the voltage compensation method adopts DC voltage full compensation method, and the voltage detection algorithm adopts the DC voltage detection algorithm based on extrapolation prediction. The controller adopts voltage loop based on active damping and double closed loop proportional integral control of current loop, which ensures the response speed of the system and the steady-state precision of the output. The simulation model of unidirectional DC dynamic voltage restorer is built on MATLAB/Simulink software platform, and the experimental platform of 2kW is built based on DSPACE1005 controller. The simulation and experimental results show the correctness of the topology and the effectiveness of the control algorithm. Finally, based on the topology of the unidirectional DC dynamic voltage restorer, a bidirectional DC dynamic voltage restorer is proposed. In order to solve the problems of voltage sudden rise, voltage sag and drop in DC microgrid, the corresponding voltage detection, judgement algorithm and controller compound control algorithm are designed based on topology, and the simulation model is built in the MATLAB/Simulink software platform. Verify the correctness of the proposed theory.
【学位授予单位】：上海电力学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761.12

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