六边形变换器低频输电系统的控制策略  

Control Strategy of Low-frequency Power Transmission System Based on Hexagonal Converter

作　　者：林宝全[1] 易杨 许俊棋 钱冲 LIN Baoquan;YI Yang;XU Junqi;QIAN Chong(Fujian Key Laboratory of New Energy Generation and Power conversion,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学福建省新能源发电与电能变换重点实验室,福州350108

出　　处：《实验室研究与探索》2023年第7期89-93,共5页Research and Exploration In Laboratory

基　　金：福州大学研究生教育教学改革项目(2021-GSFZUJG-1-16)。

摘　　要：为了实现六边形变换器的低频交流电能变换及其运行控制,研究了六边形变换器的数学模型,建立了原副方频率多重dq解耦控制模型,实现了原副方灵活的功率控制。针对桥臂功率不平衡导致的桥臂直流电压不平衡问题,研究了六边形变换器的零序环流模型,分析了零序环流模型的桥臂功率转移机理,提出了基于零序环流模型的直流电压平衡控制策略。同时,将六边形变换器应用于海上风电低频输电系统,通过仿真和实验验证该数学模型和控制策略的准确性,保证了功率灵活控制和桥臂直流电压平衡,对工程应用具有一定的参考意义。To realize low-frequency AC power conversion based on Hexverter and its operation control,the mathematical model of Hexverter is studied.The multiple d q decoupling control model based on the primary and secondary frequency is established to realize the flexible power control.Aiming at the unbalance of DC voltages caused by the imbalance of powers,the zero-sequence circulating current model of Hexverter is studied.Based on the zero-sequence circulating current model,the mechanism of power transfer between adjacent submodules and branches is studied.And the DC voltage balance control strategy is proposed.The correctness of the mathematical model and control strategy is verified by simulation and experiment.It has certain guiding significance for engineering application.

关 键 词：低频输电 六边形变换器 数学模型 零序环流 直流电压平衡控制 

分 类 号：TM464[电气工程—电器]