摘要
针对应用于高压直流输电(HVDC)系统互联的高频模块化直流变压器(HFMDCT),以直流电流纹波及高频环节电流应力大小为优化目标,提出了HFMDCT的直流链匹配多电平控制策略。对HFMDCT在多电平控制方法下的直流电流纹波机理进行了分析;通过采用拉格朗日因子法得到优化高频环节电流应力的直流链占空比条件,并以此为依据提出了高频变压器变比的设计原则;同时,为了在直流电压变化时仍可以保证HFMDCT的运行效率,进一步提出了基于直流链匹配多电平控制策略的直流电流纹波优化控制方法。
In order to optimize the DC current ripple and high-frequency link current stress of HFMDCT( High-Frequency Modular DC/DC Transformer) for interconnected HVDC( High Voltage Direct Current) systems,a novel DC link matching multilevel control strategy is proposed.The DC current ripple mechanism of HFMDCT under the multilevel control method is analyzed.Then,the DC link duty cycle condition that optimizes the high-frequency link current stress is obtained using Lagrange method.On this basis,the design principle of high-frequency transformer ratio is proposed.At the same time,in order to ensure the operational efficiency of HFMDCT particularly under the variation of DC voltage,a DC current ripple optimization control method based on DC link matching multilevel control strategy is proposed.
作者
陈东
梅念
孙谦浩
宋强
孟经伟
王裕
CHEN Dong;MEI Nian;SUN Qianhao;SONG Qiang;MENG Jingwei;WANG Yu(State Grid Economic and Technological Research Institute Co.,Ltd.,Beujing 102209,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;School of Automation,Guangdong University of Technology,Guangzhou 510006,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2019年第1期27-32,共6页
Electric Power Automation Equipment
基金
国家重点研发计划项目(2016YFB0901004)
国家电网公司科技项目(B3441417K002)~~
