摘要
由于线路阻抗分布不均,基于定虚拟电阻的传统下垂控制方法在孤立直流微电网负荷分配中无法同时满足均流及调压要求。文中提出了一种基于离散一致性的自适应下垂控制策略,各控制节点在同步时钟的作用下与邻居节点交换电压、电流信息,通过本地的分布式算法迭代评估全网平均电压,并动态寻找满足均流及调压要求的目标虚拟电阻,实现变虚拟电阻的自适应下垂控制。由于没有中心控制器,增加了控制的鲁棒性及灵活性。利用Matlab/Simulink搭建包含光伏系统、燃料电池、储能蓄电池、恒功率负荷的直流微电网模型,在JADE平台上开发离散的分布式算法及通信协议,通过联合仿真验证了所提控制策略的有效性。对通信延时的影响进行了详细分析,并提出了相应的解决措施;设计了节点投退机制,仿真验证了所提策略的即插即用特性。
Conventional droop control based on constant virtual resistance has limitations on the application of load-sharing of isolated DC microgrid, due to the unbalanced distribution of the line impedance. In this paper, a distributed adaptive droop control strategy based on discrete consensus was proposed, an average voltage of grid was evaluated and an objective virtual resistance fulfilling above requirement was dynamically calculated by local controllers, which would communicate with its neighbors using voltage and current information within the synchronized clock, then the adaptive droop control based on variable virtual resistance was applied. Because of having no central controller, the robustness and flexibility of the control is increased significantly. A DC microgrid model including PV system, fuel cells, energy storage batteries, constant power loads was built based on the Matlab/Simulink, and JADE （Java agent development framework） was used to develop distributed algorithm and communication protocol, then the effectiveness of the control strategy was verified based on simulation. The influence of communication delay was analyzed, and some proposals were proposed to decrease the influence. In order to verify the ‘plug and play’ capability, a scheme of self-organization was designed and simulated.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第17期4397-4407,共11页
Proceedings of the CSEE
基金
国家自然科学基金(51177015)
新世纪优秀人才支持计划(NCET-13-0129)
国家电网公司项目(5211011400AX)~~
关键词
直流下垂控制
全网平均电压
目标虚拟电阻
离散一致性算法
通信延时
自组织投退
DC droop control
networked average voltage
objective virtual resistance
discrete consensus algorithm
communication delay
self-organization
