一种适用于BESS的交错并联双向DC/DC变换器

针对现有电池储能系统(BESS)双向DC/DC变换器(BDC)电压增益低和开关器件电压应力高等特点,提出一种适用于BESS的两相交错并联BDC。该储能系统(ESS)能有效结合Z源网络和交错并联结构的优势特性。详细分析了该ESS的工作原理、Boost和Buck模式,并推导出2种工作模式下的电压变化比。同时对该ESS两相交错并联BDC的带逻辑判断单元的载波移相控制策略进行了详细介绍。在Matlab/Simulink中搭建仿真实验模型,验证了该ESS各工作模式下的主要工作波形。仿真实验结果表明该系统具有电压增益高、开关器件电压应力低和各相电感之间能实现自动均流等优点。

AN INTERLEAVED PARALLEL BIDIRECTIONAL DC/DC CONVERTER FOR BESS

According to the characteristics of low voltage gain and high voltage stress of switching devices in the existing bi-directional DC/DC converter of battery energy storage system(BESS),this study proposes a bi-directional DC/DC converter with interleaving and parallel for BESS.The ESS can effectively combine the advantages of Z-source network and interleaved parallel structure.The working principle,boost mode and buck mode of the ESS are analyzed in detail,and the voltage conversion ratios under the two modes are deduced.Meanwhile,the carrier phase-shift control strategy with logic judgment unit for the two-phase interleaved parallel bidirectional DC/DC converter of the ESS is introduced in detail.Further,the main working waveforms of the system under each working mode are verified by building the simulation experiment model using MATLAB/Simulink.The simulation results show that the system has the advantages of high voltage gain,low voltage stress of switching devices and automatic current sharing between inductors.