含多逆变器的微电网系统网络化分层控制方法研究

项目名称： 含多逆变器的微电网系统网络化分层控制方法研究

项目编号： No.51467009

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 电工技术

项目作者： 吴丽珍

作者单位： 兰州理工大学

项目金额： 51万元

中文摘要： 微电网已成为国内外解决电力系统众多问题的一个重要辅助手段,本项目针对含多并联逆变器的微电网并网与孤岛运行方式以及2 种运行方式之间的转换，提出新的网络化分层协调控制方法。利用网络化通信技术，建立基于时间和空间尺度的微网系统网络化分层控制体系结构和数据通信平台；对比分析虚拟同步发电机和逆变器下垂控制性能优劣和物理相关性，研究多逆变器并联组网的微网系统的网络化分层控制策略；针对有功和无功分量严重耦合引起的无功功率无法精确分配和增加虚拟电抗带来的电压跌落问题,深入研究中央控制器二次频率\电压控制和联络线功率控制，寻求最佳的有功功率\无功功率动态经济分配算法；分析微网系统主动从主干电网切入\切出的瞬态过程，研究多逆变器协调同步接入\退出主干电网的控制方法。通过搭建数字仿真平台和实验平台，分别验证所提出方法的有效性，从而实现微网在结构和负荷发生变化时仍能稳定运行，并网与孤岛运行方式能平稳过渡的目标。

中文关键词： 微电网；分层控制；协调控制；网络化控制系统；分布式发电

英文摘要： As an effective way to solve various problems in modern power systems, microgrid is increasingly adopted at home and abroad. According to the grid-connected and islanded operating modes of microgrid and the changeover between them，a new Network-based hierarchical coordinated control method was proposed. Using the network communication technology, the network-based hierarchical control structure based on the different time and space scales and data acquisition platform for microgrid was established; comparative analysis of Virtual Synchronous Generator (VSG) and inverter droop control performance and physical correlation, the networked hierarchical control strategy for microgrid with multi-inverter parallel was studied; For dealing with inaccurate distribution of reactive power caused by sever coupling between active and reactive component and voltage droop by adding virtual reactance to inverter，through the central controller with second frequency / voltage control and tie line power control study, the optimal active power and reactive power of dynamic economic allocation algorithm was seek; analysis the transient process of the microgrid from the main grid starting or cutting out, the control method of multi-inverter more coordinated synchronous access/exit the main power grid was proposed. Through the platform of digital simulation and the experimental, the effectiveness of the proposed control methods were validated respectively. The studies for the project makes the microgrid with a variety of distributed generation can still stable operation of grid connected and islanded operation mode and with a smooth transition even if the structure and load changes.

英文关键词： Microgrid;Hierarchical control;Coordination Control;Networked Control Systems;Distributed Generation