改善微电网电能质量的动态电压恢复器研究

发布时间：2018-06-23 05:29

本文选题：微电网电能质量 + 动态电压恢复器　；参考：《东南大学》2015年硕士论文

【摘要】：随着能源的日益紧缺以及社会对环境保护的更加重视,可再生能源的利用成为了当下热点。由分布式发电以及储能技术等支撑的微电网已得到了应用,微电网的结构和运行方式,在电能质量治理方面和传统配电网相比,具有许多新的特点。本文从分析微电网的结构着手,针对微电网与配电网的公共连接点处的电压跌落问题,进行了针对性研究,给出了一种适合于微电网的动态电压恢复器(DVR)。分析了常规DVR的拓扑结构,重点对逆变器单元和储能单元分析,并在储能方面进行了改进,选择了适合于微电网的DVR拓扑结构。对主电路的参数设计进行了讨论。研究了DVR补偿指令电压的生成过程,利用最小能量补偿算法的原理,结合dq0检测算法的特点,给出了最小能量补偿算法指令电压的生成过程。同时,对生成指令电压起重要作用的锁相环进行了分析,详细介绍了适合三相电路的基于双同步坐标系的解耦软件锁相环。阐述了DVR的控制策略,结合前馈控制和双闭环控制策略的特点,提出了一种基于PR控制器的双环控制策略,以负荷电压为控制目标,使其稳定跟踪指令电压。搭建了微电网DVR仿真平台,验证了控制策略、补偿算法的正确性,对电阻负载和阻感负载下的最小能量补偿方法进行了验证。根据主电路参数和MATLAB/Simulink仿真对主电路器件进行选择,再通过合理的布局和连线,完成了实验平台的搭建,最后介绍了DVR实验平台的硬件设计和软件设计,并在电阻负载和阻感负载下进行了实验验证。
[Abstract]:With the increasing shortage of energy and more attention to environmental protection, the use of renewable energy has become a hot spot. Microgrid supported by distributed generation and energy storage technology has been applied. The structure and operation mode of microgrid have many new characteristics compared with traditional distribution network in power quality management. In this paper, the structure of microgrid is analyzed, and a dynamic voltage restorer (DVR) suitable for microgrid is presented, aiming at the problem of voltage sag at the common connection point between microgrid and distribution network. The conventional DVR topology is analyzed, the inverter unit and the energy storage unit are analyzed, and the energy storage is improved. The DVR topology suitable for microgrid is selected. The parameter design of the main circuit is discussed. Based on the principle of the minimum energy compensation algorithm and the characteristics of the dq0 detection algorithm, the generating process of the instruction voltage of the minimum energy compensation algorithm is presented. At the same time, the phase-locked loop, which plays an important role in generating instruction voltage, is analyzed, and the decoupled software phase-locked loop which is suitable for three-phase circuit based on double synchronous coordinate system is introduced in detail. This paper expounds the control strategy of DVR, combines the characteristics of feedforward control and double closed loop control strategy, and puts forward a dual loop control strategy based on PR controller, which takes load voltage as the control target and makes it stable to track the command voltage. The DVR simulation platform of micro-grid is built to verify the correctness of control strategy and compensation algorithm. The minimum energy compensation method under resistive load and resistive load is verified. According to the main circuit parameters and MATLAB / Simulink simulation, the main circuit device is selected, and the experimental platform is built by reasonable layout and connection. Finally, the hardware and software design of DVR experimental platform is introduced. The experimental results are verified under resistance load and resistance load.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM714.2

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