为提升电池储能系统的效率与安全性,提出一种基于部分功率变换（PPC）的电池储能优化方案。在串联部分功率变换器结构中,电池串联端和母线端相互耦合影响,充分考虑这种影响后对该拓扑进行阻抗建模。针对电池放电工况下系统不稳定情况,通过对系统控制框图等效变换,提出一种适用于部分功率变换的储能变换器阻抗重塑控制策略,以改善电池储能系统的稳定性。该方法在较小的频率范围内调整源变换器输出阻抗与负载变换器输入阻抗的交截范围,满足系统阻抗相匹配的稳定要求。最后通过完成系统仿真并搭建实验平台,验证所提电池储能变换器方案与控制方法的有效性与实用性。
Abstract
In order to improve the efficiency and safety of battery energy storage system, an energy storage optimization scheme based on partial power conversion （PPC） technology is proposes in this paper. Due to the coupling effect between the battery series end and the bus end in the series part power converter structure, impedance modeling of this topology is fully considered this influence to provide a theoretical basis for system stability analysis. Aiming at the instability of the system under the condition of battery discharge, by performing system control diagram equivalence transformation, an input voltage feedforward control-based energy storage converter impedance reshaping control strategy is proposed to improve the stability of the battery energy storage system. This strategy can meet the stability requirement of matching the system impedance without affecting the closed-loop dynamic of the converter. Finally, the system simulation is completed, the experimental platform is built to verify the validity and practicability of the proposed energy storage converter scheme and control method.
关键词
部分功率变换 /
阻抗建模 /
稳定性分析 /
阻抗重塑
Key words
partial power conversion /
impedance modeling /
stability analysis /
impedance reshaping
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