摘要
独立运行的多微源直流微电网,因其抗扰动能力弱,需要制定合理的能量管理控制策略来平衡微源间的功率流动,实现直流微电网的稳定运行。采用基于多个松弛终端的直流母线电压分层控制策略实现直流微电网的协调控制,当直流微电网中光伏发电功率或者负载发生变化时,通过松弛终端来维持直流母线电压稳定。根据电压分层控制策略,文章所研究的微网组网中松弛终端是超级电容、蓄电池和燃料电池,分别采用双闭环电流电压控制、基于电压的下垂控制和恒压控制实现孤岛模式下分布式发电系统和混合储能系统间的功率平衡。其中光伏发电根据需要可以作为松弛终端,也可以作为功率终端。通过仿真分析研究,验证了该控制策略的良好效果。
Independent operation of DC micro-grid with multiple micro power supplies needs to develop a reasonable energy management control strategy to balance the power flow between micro sources because of its weak anti disturbance ability. To realize the coordinated control of DC microgrid, the DC bus voltage hierarchical control strategy based on multiple slack terminals is proposed. The stability of DC bus voltage can be maintained by the slack terminals when photovohaic power generation or/and load changes in DC micro-grid. According to the hierarchical voltage control strategy, the slack terminals of the micro-grid network studied in this paper are super capacitor, battery and fuel cell. To balance the power flow between distributed generation system and hybrid energy storage system in the island mode, the strategies of double closed loop current and voltage control, voltage droop control and constant voltage control are respectively adopted to control the slack terminals. The photovohaic modules can be flexibly acted as a slack terminal, or as a power terminal depending on the working conditions. These control strategies are demonstrated effective through simulation studies.
出处
《可再生能源》
CAS
北大核心
2016年第9期1293-1300,共8页
Renewable Energy Resources
基金
国家自然科学基金项目(61275038)
(61304134)
上海市重点科技攻关计划(14110500700)
上海市科学技术委员会工程技术研究中心项目资助(14DZ2251100)
上海市自然科学基金(13ZR1455000)
关键词
直流微网
分层控制
松弛终端
下垂控制
DC micro-grid
hierarchical control
slack terminal
droop control
