电网技术2018，Vol.42Issue(1)：56-64,9.DOI:10.13335/j.1000-3673.pst.2017.1006
直流固态变压器控制技术研究
Research on Control Technology of DC Solid State Transformers
摘要
Abstract
In order to solve voltage and current sharing problem among sub-modules and meanwhile guarantee voltage stability control on DC microgrid side and flexible bidirectional operation for DC solid state transformer (DCSST),acting as interface between MV DC distribution grid and LV DC microgrid,a double-loop decoupling control is proposed,consisting of a main control loop of DCSST output voltage and an additional control loop for input voltage balancing.Based on input-in-series output-in-parallel (ISOP) structure and phase shift control principle of isolated bidirectional DC/DC converter (IBDC),unified DCSST modeling is carried out,and decoupling conditions between the two control loops are analyzed by deriving its small signal linear model and transfer function.Simulation and experiment results show that,with the proposed control strategy and control parameters,the output voltage stability and input voltage balance of DCSST can be effectively ensured under bidirectional power flow.Meanwhile,output current ripple is effectively suppressed with interleaving control between IBDC modules.关键词
直流配网/直流微网/直流固态变压器/解耦控制/输入串联输出并联/均衡控制/交错控制Key words
DC distribution grid/DC microgrid/DC solid state transformer/decoupling control/input-in-series and output-in-parallel/balance control/interleaving control分类
信息技术与安全科学引用本文复制引用
孙贺,张建成,付超,孙玉巍..直流固态变压器控制技术研究[J].电网技术,2018,42(1):56-64,9.基金项目
国家自然科学基金项目(51177047) （51177047）
河北省科技计划项目(16214504D).Project Supported by National Natural Science Foundation of China (51177047) （16214504D）
Project Supported by Science and Technology Planning Project of Hebei Province,China(16214504D). （16214504D）
