基于混合储能荷电状态的光伏直流微网系统能量分配策略  

Energy allocation strategy for photovoltaic DC microgrid system based on hybrid energy storage state of charge

作　　者：胡治国[1] 李永杰 张磊冲 HU Zhiguo;LI Yongjie;ZHANG Leichong(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo Henan 454003,China)

机构地区：[1]河南理工大学电气工程与自动化学院,河南焦作454003

出　　处：《电源技术》2024年第2期337-344,共8页Chinese Journal of Power Sources

基　　金：国家自然科学基金(52177039);河南省科技攻关项目(232102240103)。

摘　　要：针对混合储能系统在平抑光伏波动以及负荷投切时荷电状态(SOC)易越限问题,提出一种基于混合储能SOC的多模式协调控制策略。在传统低通滤波功率分配的基础上,提出一种基于超级电容荷电状态的动态功率修正策略,使超级电容出力后SOC向安全状态恢复;同时,为避免蓄电池频繁切换充放电状态,在其响应环节加入优化后的延时控制。此外,根据光伏出力情况、混合储能SOC,设计出满足直流微网系统动态平衡的六种运行模式,实时调节各储能单元出力情况。在MATLAB/Simulink中搭建了光伏直流微网混合储能系统仿真模型,仿真结果表明所提策略在各工况下均能稳定运行,有效延长了储能介质使用寿命。A multi-mode coordinated control strategy based on hybrid energy storage SOC was proposed to solve the problem that SOC is easy to exceed the limit when the hybrid energy storage system suppresses the photovoltaic fluctuations and load switching.On the basis of traditional low-pass filter power allocation,a dynamic power correction strategy was proposed based on the state of charge of the super capacitor to restore the SOC to a safe state after the super capacitor was put into operation.At the same time,in order to avoid frequently switching between charging and discharging states of the battery,the optimized delay control was added into its response link.In addition,according to photovoltaic output and hybrid energy storage SOC,six operation modes meeting the dynamic balance of DC microgrid system were designed to adjust the output of each energy storage unit in real time.A simulation model of photovoltaic DC microgrid hybrid energy storage system was built in MATLAB/Simulink.The simulation results show that the proposed strategy can operate stably under all working conditions,effectively extending the service life of the energy storage medium.

关 键 词：直流微网 混合储能 荷电状态 协调控制 功率修正 

分 类 号：TM615[电气工程—电力系统及自动化]