微电网中多虚拟同步机并联运行有功振荡阻尼控制  

Power Oscillation Damping Control for Microgrid With Multiple VSG Units

作　　者：洪灏灏 顾伟[1] 黄强 陈亮 袁晓冬 王建华[1] HONG Haohao;GU Wei;HUANG Qiang;CHEN Liang;YUAN Xiaodong;WANG Jianhua(School of Electric Engineering,Southeast University,Nanjing 210096,Jiangsu Province,China;State Grid Jiangsu Electric Power Research Institute,Nanjing 211103,Jiangsu Province,China)

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]国网江苏省电力有限公司电力科学研究院,江苏省南京市211103

出　　处：《中国电机工程学报》2019年第21期6247-6254,共8页Proceedings of the CSEE

基　　金：国家重点研发计划(2016YFB0900404);国家自然科学基金项目(51477029);国家电网公司科技项目资助(J2017037)~~

摘　　要：微电网中分布式电源大多缺乏必要的惯量导致系统频率稳定性较差,因此采用虚拟同步机技术(virtual synchronousgenerator,VSG)来模拟同步电机特性以提供惯量支撑,但同时又引入了有功功率振荡等问题,特别当多VSG并联运行时这一问题更加严峻。该文提出一种基于分布式通信架构的互阻尼控制策略,通过相邻VSG间的互阻尼控制,使得扰动下系统内VSG时刻趋于相同的输出频率,改善了VSG的动态特性,从而有效地抑制了功率振荡。另外,该文通过构造李雅普诺夫能量函数的方法证明了改进后系统的稳定性,并通过搭建基于RT-LAB的半实物实时仿真平台验证了所提控制策略的有效性。Most of distributed generations in microgrid are lack of inertia, which results in poor frequency stability. To solve this problem, virtual synchronous generator(VSG) control method is proposed to simulate the characteristics of synchronous generator. However, active power oscillation is introduced under basic VSG control, which would be more serious when multiple VSGs operate in parallel. In this paper, a control strategy based on mutual damping under distributed communication(MDDC) was proposed, with which the power oscillation was restrained effectively and the dynamic characteristics of VSG was improved. Furthermore, the stability of the improved system was analyzed and proved by Lyapunov function. Finally, a real-time simulation platform based on RT-LAB was built to verify the proposed control strategy.

关 键 词：虚拟同步机 输出频率特性 并联控制 分布式通信 能量函数法 RT-LAB 

分 类 号：TM712[电气工程—电力系统及自动化]