摘要
交直流混合微网为高密度分布式能源接入配电网提供了更加有效的途径。其中,由多台并联运行的AC/DC双向换流器构成的交直潮流断面对维持混合微网内功率的动态平衡起到至关重要的作用。文章基于非线性最优控制理论,提出一种潮流断面协调最优控制策略。该策略能够依据各换流器的动态裕量实现潮流断面有功功率的协调分配。同时,采用反馈线性化理论设计了非线性最优控制器,使得传输功率和直流电压具有最优的动态响应特性。文章所提控制策略能够兼顾稳态功率合理分配和动态响应最优的双重优化目标。最后,利用MATLAB仿真平台验证了所提控制策略的正确性和可行性。
AC/DC hybrid microgrid provides a more effective way for high density distributed energy access to distribution network. The AC / DC power interface, which is composed of multiple parallel AC/DC converters, is very important to maintain the dynamic balance of power in the hybrid mierogrid. Based on the nonlinear optimal control theory, a coordinated optimal control strategy for the AC/DC power interface was proposed in this paper. According to the dynamic margin of each converter, the proposed method Could realize the coordinated distribution of the active power among AC/DC converters. At the same time, the feedback linearization theory was utilized to make the transmitted power and DC voltage have optimal dynamic response characteristics. The strategy presented in this paper can take into account both the power distribution and the optimal dynamic response. Finally, the correctness and feasibility of the proposed strategy were verified by MATLAB simulation platform.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2017年第13期3755-3763,共9页
Proceedings of the CSEE
基金
国家高技术研究发展计划(863计划)资助项目(2015AA050104)
国家自然科学基金项目(51577068
51607069)~~
关键词
交直流混合微网
最优控制
交直潮流断面
协调
分配
动态响应
AC/DC hybrid microgrid
optimal control
AC/DC power interface
coordinated distribution
dynamicresponse
