多储能变换器直流微电网功率控制  

DC Microgrid Power Control of Multi-energy Storage Converter

作　　者：李显忠[1] 肖杰 李峥[1] 何培东[1] LI Xianzhong;XIAO Jie;LI Zheng;HE Peidong(State Grid Sichuan Electric Power Company,Chengdu 610094,China)

机构地区：[1]国网四川省电力公司,成都610094

出　　处：《大电机技术》2021年第6期81-87,共7页Large Electric Machine and Hydraulic Turbine

基　　金：国网四川省电力公司科技项目(52199718001M)。

摘　　要：直流微电网因其控制策略简单、安装灵活,现今逐步得到广泛应用。在分析双有源桥隔离型DC-DC变换器工作原理和控制策略的基础上,由于多变换器到直流母线公共节点之间存在一定的线缆阻抗,这将导致直流母线电压和多储能单元间的功率分配产生偏差,同时无法实现多储能单元间按照SOC值进行功率分配,文中提出了基于电压偏差补偿器和功率分配精度补偿器的改进下垂控制策略,以实现功率均分和电压无差调节。通过实验验证该控制策略适用于多储能变换器构成的直流微电网系统间的功率分配。DC microgrid is now gradually being widely used because of its simple control strategy and flexible installation.Based on the analysis of working principle and control strategy of dual active bridge isolated DC-DC converter(DAB),there is a certain cable impedance between the multiple converters and the DC bus common point,which will cause the DC bus voltage deviation and power distribution deviation among multiple energy storage units.At the same time,it is expected that power distribution among multiple energy storage units will be based on the state of charge(SOC).In this paper,an improved droop control method based on voltage deviation compensator and power distribution accuracy compensator is proposed to improve powersharing accuracy and reduce voltage deviation.Experiment verifies that the control strategy is suitable for power distribution among DC microgrid systems composed of multiple energy storage converters.

关 键 词：直流微电网 DAB变换器 下垂控制 功率分配 

分 类 号：TM721.1[电气工程—电力系统及自动化]