可逆固体氧化物电池的部分功率变换四象限运行能效优化  

Energy Efficiency Optimization for Partial Power Conversion Four Quadrant Operation of Reversible Solid Oxide Cell

作　　者：吴穆星 赵巍[1] 吴俊娟[1] 孙孝峰[1] 李昕[1] WU Muxing;ZHAO Wei;WU Junjuan;SUN Xiaofeng;LI Xin(Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province(Yanshan University),Qinhuangdao 066004,Hebei Province,China)

机构地区：[1]电力电子节能与传动控制河北省重点实验室(燕山大学),河北省秦皇岛市066004

出　　处：《中国电机工程学报》2023年第22期8757-8771,共15页Proceedings of the CSEE

基　　金：河北省自然科学基金重点项目(E2021203162);秦皇岛市科技计划项目(202005A013);河北省重点研发项目(19214405D)。

摘　　要：为了提高可逆固体氧化物电池(reversible solid oxide cell,rSOC)的并网转换效率,提出一种基于部分功率变换(partial power conversion,PPC)技术的双极性优化方案,对比单极性电路能够提升电池电压支撑范围以及系统效率。建立rSOC的电化学模型并分析PPC变换下的电压功率范围,分析表明在双极性变换下,变换器的轻载工作带与rSOC在双向运行时不对称的功率特性降低了系统效率。为进一步优化系统,根据效率与功率需求优化了rSOC工作运行带,使变换器能够正常工作,并结合双极性变换与LLC的特点,提出一种双极性双向LLC谐振变换器,能够满足4种工作模式,并分析了变换器正反向增益特性,提出非对称工况下的谐振参数设计方案,使正反向均能高效运行。最后完成了系统仿真与模式切换仿真,搭建实验平台,验证了所提储能系统优化方案的高效性与实用性。To improve the grid-connected conversion efficiency of reversible solid oxide cell(rSOC),this paper proposes a bipolar optimization scheme based on the partial power conversion(PPC)technology,which can increase the cell voltage support range and system efficiency compared to unipolar conversion.The electrochemical model of rSOC is established and the range of voltage and power under PPC conversion is analyzed.The analysis shows that under bipolar conversion,the asymmetric power characteristics of the converter light-load operating band and rSOC in bidirectional operation reduce the system efficiency.In order to further optimize the system,the rSOC operating band is optimized according to the efficiency and power requirements,so that the converter can operate normally.Combined with the characteristics of bipolar conversion and LLC,a bipolar bidirectional LLC resonant converter is proposed,which can satisfy four operating modes;the forward and backward gain characteristics of the converter are analyzed,the design scheme of the resonant parameters under asymmetric working conditions is proposed,so that both forward and backward operation can be efficiently operated.Finally,the system simulation and mode switching simulation are completed,the experimental platform is built to verify the efficiency and practicability of the proposed energy storage system optimization scheme.

关 键 词：双极性电压 可逆固体氧化物电池(rSOC) 部分功率变换(PPC) LLC谐振变换器 

分 类 号：TM46[电气工程—电器] TM911.4