适用于直流电网的推挽式直流自耦变压器及其控制策略  

Push-pull Type DC Autotransformer and its Control Strategy Suitable for DC Power Grid

作　　者：韩鸣宇 左文平[1] 周猛[1] 文劲宇[1] HAN Mingyu;ZUO Wenping;ZHOU Meng;WEN Jinyu(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北武汉430074

出　　处：《智慧电力》2021年第2期15-22,共8页Smart Power

基　　金：中国博士后科学基金第66批面上资助项目(2019M-662622)。

摘　　要：基于双有源桥拓扑结构的能量传输机理,通过融合直流自耦变压器与模块化多电平换流器的拓扑演绎规律,提出了具有高传输效率和高运行可靠性的推挽式直流自耦变压器。分析了推挽式直流自耦变压器的工作机理、控制策略和系统参数对运行特性的影响。通过采用特定拓扑结构的四绕组变压器并结合推挽式工作模式,推挽式直流自耦变压器内部的特定四绕组变压器可由2个相同的单相双绕组变压器等效代替分析,极大简化了稳态控制策略的设计难度。PSCAD/EMTDC仿真验证了推挽式直流自耦变压器的技术可行性与有效性。Based on the power transmission mechanism of dual active bridge topology,this paper proposes a push-pull type DC autotransformer(PPDAT)with high transmission efficiency and operational reliability by integrating the topology evolution law of DC autotransformer and modular multilevel converter,and analyzes the impact of the working mechanism,control strategy and system parameter on the operating characteristics of PPDAT.By adopting the four-winding transformer with specific topology and combining the push-pull operation mode,the specific four-winding transformer inside PPDAT can be replaced by two identical single-phase double-winding transformers,greatly simplifying the design difficulty of steady-state control strategy.Finally,PSCAD/EMTDC simulation shows the technical feasibility and effectiveness of PPDAT.

关 键 词：柔性直流输电 直流电网 直流变压器 推挽式直流自耦变压器 

分 类 号：TM411[电气工程—电器]