一种新型双向三电平倍流LCL-T谐振直流变换器  

Novel bidirectional three-level double-current LCL-T resonant DC converter

作　　者：张钟艺 金涛[1,2] 肖晓森 戴向阳 吴维鑫 ZHANG Zhongyi;JIN Tao;XIAO Xiaosen;DAI Xiangyang;WU Weixin(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China;Fujian Key Laboratory of New Energy Generation and Power Conversion,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108 [2]福州大学福建省新能源发电与电能变换重点实验室,福建福州350108

出　　处：《电力自动化设备》2023年第2期96-103,111,共9页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51977039)。

摘　　要：随着蓄能锂电池恒流充电方式的普及,针对双向车载充电机中传统电压源直流变换器不具备自然恒流输出问题,提出一种新型双向三电平倍流LCL-T谐振直流变换器,其由LCL-T谐振结合三电平级联中性点箝位有源桥构成。由于耦合变压器级联的特殊方式,有源桥各子桥臂可独立或并行工作,据此可设计不同的调制方式控制谐振腔输入电压,建立变换器一倍、二倍准恒流模式。为实现双向功率传输特性一致,谐振腔器件参数采用对称设计,进而研究了一种受归一化频率fn、品质因数Q控制的LCL-T谐振准恒流输出,并考虑无功功率控制和实现开关管零电压开通,设计满足给定准恒流输出精度的输出工况筛选算法。最后通过所搭建的仿真平台和实验样机证明所提变换器在各模式下均能实现给定精度内的准恒流输出。For the popularization of constant-current charging methods for energy storage batteries,aiming at the problem that the conventional voltage source direct current(DC) converter hasn’t natural constant-current output in the bidirectional on-board charger,a novel bidirectional three-level double-current LCL-T resonant DC converter is proposed by combining the LCL-T resonance with the three-level cascaded neutral-point clamp active bridge. Due to the special pattern of cascading by the coupling transformers,each sub-arm of the active bridge can work independently or in parallel. Based on this,different modulation methods can be designed to control the input voltage of the resonant tank,and establish one-time and two-time quasiconstant-current(QCC) modes. Furthermore,the symmetrical design of the resonant tank parameters is used to achieve unified bidirectional power transmission characteristics,and a LCL-T resonant QCC output controlled by normalized frequency fn and quality factor Q is researched. Considering the reactive power control and realizing zero-voltage switching of switches,the filtering algorithm of output condition that satisfies the restricted given QCC output accuracy is designed. Finally,the simulation platform and experimental prototype are established to prove that the proposed converter can achieve the QCC output within a restricted given accuracy in each mode.

关 键 词：双向车载充电机 LCL-T谐振 变换器 三电平级联中性点箝位有源桥 准恒流输出 筛选算法 

分 类 号：TM46[电气工程—电器]