摘要
针对多储能单元级联的高电压、大容量应用场合,提出一种级联双级型电池储能系统。该系统由AC/DC与DC/DC两级变换器构成,且均采用模块化多电平级联结构,具有结构紧凑、可靠性高、能量控制简单等优点。建立该系统的数学模型并分析其工作原理及约束条件,设计了多电池组荷电状态(SOC)均衡策略,有效解决了电池过充或过放的问题;针对储能系统在不对称运行条件下直流电流波动过大的问题,提出一种直流波动抑制的前馈控制策略。最后,基于RTDS对该系统及控制策略进行数字-物理闭环仿真,验证了系统结构和控制策略的有效性。
A cascaded bipolar BESS(Battery Energy Storage System) is proposed for the high-voltage and large-capacity applications of multiple cascaded energy storage units,which is composed of an AC/DC converter and a DC/DC converter. Both converters adopt the multilevel modular cascading structure,which is compact,highly reliable and simple for energy control. A mathematical model is built for the system,its working principle and constraints are analyzed,and the SOC(State Of Charge) balancing strategy is designed for multiple battery packs to avoid the over-charging and over-discharging. Aiming at the large DC current fluctuation of BESS during its operation in asymmetric eonditions,a feedward control strategy is proposed to smooth the DC current fluctuation. The digital-physical closed-loop simulation based on RTDS verifies the effectiveness of the proposed system structure and control strategies.
出处
《电力自动化设备》
EI
CSCD
北大核心
2016年第8期103-109,共7页
Electric Power Automation Equipment
基金
国家高技术研究发展计划(863计划)资助项目(2011AA05A113)~~
关键词
模块化多电平变换器
电池储能系统
SOC均衡策略
不对称补偿策略
数字-物理闭环仿真
modular muhilevel converter
battery energy storage system
SOC balancing strategy
asymmetric compensation strategy
digital-physical closed-loop simulation