基于储能型柔性多状态开关的直流微电网与交流配电网柔性互联策略  

Flexible interconnection strategy between DC microgrid and AC distribution grid based on energy storage flexible multi-state switch

作　　者：杨万里 涂春鸣[1] 兰征[1,2] 肖凡 郭祺[1] 王鑫[1] YANG Wanli;TU Chunming;LAN Zheng;XIAO Fan;GUO Qi;WANG Xin(National Electric Power Conversion and Control Engineering Technology Research Center,Hunan University,Changsha 410082,China;College of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]湖南大学国家电能变换与控制工程研究中心,湖南长沙410082 [2]湖南工业大学电气与信息工程学院,湖南株洲412007

出　　处：《电力自动化设备》2021年第5期254-260,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51807058);湖南省科技领军人才计划资助项目(2019RS3014)。

摘　　要：柔性多状态开关大多采用“刚性”的变流控制策略,导致其端口惯性与阻尼不足,直流微电网通过其接入时难以与交流配电网进行柔性互联,无法响应交流配电网调频调压。为此,提出一种基于储能型柔性多状态开关的直流微电网与交流配电网柔性互联策略,交直流端口统一采用虚拟电机控制,通过模拟电机的惯性和阻尼特性使交直流端口呈现柔性特性,同时针对馈线负荷不均衡问题提出一种考虑直流微电网功率交互的负荷均衡策略。仿真结果表明,所提策略能够降低直流微电网波动对交流配电网的冲击,增强直流母线电压的稳定性,主动响应交流配电网调频调压,实现了馈线负荷均衡,提升了柔性多状态开关的调控灵活性。FMSS(Flexible Multi-State Switch)mostly adopts“rigid”converting control strategy,which leads to insufficient inertia and damping of the ports.It is difficult for DC microgrid to flexibly interconnect with AC distribution grid through FMSS,and it cannot respond to frequency and voltage regulation of AC distribution grid.For this reason,a flexible interconnection strategy between DC microgrid and AC distribu⁃tion grid based on energy storage FMSS is proposed.The AC and DC ports are unified with virtual motor control,which presents flexible characteristics by simulating the damping and inertia of the motor.At the same time,a load balancing strategy considering the power interaction of DC microgrid is proposed for the problem of feeder load imbalance.The simulative results show that the proposed strategy can reduce the impact of DC microgrid fluctuations on AC distribution grid,enhance the stability of DC bus voltage,actively respond to the frequency and voltage regulation of AC distribution grid,realize feeder load balance and improve the flexibility of FMSS regulation.

关 键 词：直流微电网 储能型柔性多状态开关 虚拟电机 柔性互联 负荷均衡 

分 类 号：TM727[电气工程—电力系统及自动化]