摘要
多端柔性直流配电系统能更好地满足未来城市配电系统发展需求,其灵活的运行方式也给控制系统带来了新的挑战。针对换流器的不同下垂控制特性,理论分析了控制系统的超调量、阻尼比等动态性能,讨论了下垂系数对换流器功率输出动态特性的影响,进行了小扰动稳定分析。基于DIgSILENT仿真软件搭建了改进的IEEE 33节点算例,理论分析与仿真结果表明,I_(dc)-U_(dc)与Q-U_(ac)下垂控制相对其他下垂策略具有较好的动态特性以及较高的安全稳定裕度,更适合应用于多端互联的柔性直流配电系统。
Multi-terminal voltage source converter(VSC)based DC distribution system is better to meet the requirements of the development of future urban distribution system,while its flexible operation modes also pose new challenges to the control system.For different characteristics of droop control of converter,dynamic characteristics of the control system such as overshoot and damping ratio are analyzed theoretically.The influence of droop coefficient on the dynamic performance of converter power output is discussed,and small signal stability analysis is carried out.DIgSILENT simulation software is used to build a modified IEEE 33-node test system.The theoretical analysis and simulation result are consistent,and it shows that Idc-Udc and Q-Uac droop control strategies are superior to other droop strategies in terms of dynamic characteristics and high level of safety and stability,and it is more suitable to multi-terminal VSC based DC distribution system.
作者
赵学深
彭克
张新慧
徐丙垠
陈羽
赵曰浩
ZHAO Xueshen;PENG Ke;ZHANG Xinhui;XU Bingyin;CHEN Yu;ZHAO Yuehao(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2019年第2期89-96,共8页
Automation of Electric Power Systems
基金
国家重点研发计划资助项目(2016YFB0900600)
山东省自然科学基金资助项目(ZR2017LEE022)
国家电网公司科技项目(52094017000W)~~
关键词
多端柔性直流配电系统
下垂控制
动态特性
小扰动稳定性
multi-terminal voltage source converter based DC distribution system
droop control
dynamic characteristics
small signal stability
