摘要
通过隔离双向直流-直流(direct current-direct current,DC-DC)换流器互联多直流微电网,不仅能实现子微网间有效电气隔离及故障隔离,还可灵活控制互联功率。为提升基于隔离双向DC-DC换流器互联直流微电网集群系统稳定性和可靠性,提出一种一致性协调式控制策略,使得整个集群形成一有机整体。无论哪一直流微电网发生功率扰动,均可实现系统内所有平衡单元联动,为受扰微电网提供紧急功率支撑,改善受扰微网直流电压动态特性,减小受扰电网直流电压稳态偏差,且扰动功率由全系统平衡单元依据其等效功率分配系数比合理承担。此外,所提控制策略仅仅利用就地测量信息,无需子系统间相互通信,可靠性高。最后通过PSCAD/EMTDC仿真验证了所提控制策略的有效性。
Flexible interconnection among direct current(DC)microgrid clusters through isolated bidirectional DC-DC converters,not only can achieve electrical and fault isolation among subsystems,but also can realize interconnected power transmission flexibly.In order to improve the stability and reliability of isolated bidirectional DC-DC converter based DC microgrid cluster,a consensus-based coordinated control was proposed,by which the whole cluster could be regarded as an organic unity.No matter which subsystem suffers power disturbance,all balance units could respond to it and provided emergency power for the disturbed subsystem,the dynamic and steady state performance of DC bus voltage of the disturbed subsystem could be improved simultaneously,and the disturbed power was allocated by all balance units according to their equivalent power allocation ratio reasonably.In addition,the proposed method only relies on local measurement,which enhances system reliability greatly.Eventually,the effectiveness of the proposed method is verified by simulation in PSCAD/EMTDC.
作者
林其友
袁瑶
陈亮亮
黄晟
舒晓欣
LIN Qi-you;YUAN Yao;CHEN Liang-liang;HUANG Sheng;SHU Xiao-xin(State Grid Wuhu Power Supply Company, Wuhu 241027, China;College of Information Engineering, Nanchang Hangkong University, Nanchang 330063, China)
出处
《科学技术与工程》
北大核心
2021年第23期9907-9915,共9页
Science Technology and Engineering
基金
国家自然科学基金(12062014,51967015)
江西省自然科学基金(20202BABL204048)。
关键词
直流微电网集群
隔离双向直流-直流换流器
协调控制
柔性直流系统
direct current(DC)microgrid cluster
isolated bidirectional DC-DC converter
coordinated control
flexible DC system
作者简介
第一作者:林其友(1976—),男,汉族,安徽芜湖人,硕士,正高级工程师,研究方向:电网规划、经济运行及微电网控制,E-mail:njhnlqy@sina.com;通信作者:陈亮亮(1984—),男,汉族,江西石城人,博士,讲师,研究方向:智能电网、飞轮储能,E-mail:chenlian0510@163.com。
