不同直流电流转移方案下特高压直流分层系统输出交互特性研究  

Study on the output interaction characteristics of UHVDC layered system under different DC current transfer schemes

作　　者：周振凯[1] 付蓉[1] 宋少群 黄文英 陈峰 覃杰 ZHOU Zhenkai;FU Rong;SONG Shaoqun;HUANG Wenying;CHEN Feng;QIN jie(Automation college of Nanjing University of Posts and Telecommunications,Nanjing 210003,China;State Grid Fujian Electric Power Co.,Ltd.,Fuzhou 350000,China;Beijing Huadian Borui Power Automation Engineering Technology Co.,Ltd.,Beijing 102600,China)

机构地区：[1]南京邮电大学自动化学院,江苏南京210003 [2]国网福建省电力有限公司,福建福州350000 [3]北京华电博瑞电力自动化工程技术有限公司,北京102600

出　　处：《电气应用》2019年第12期69-78,共10页Electrotechnical Application

基　　金：国家自然科学基金重点资助项目(61633016)

摘　　要：由于特高压直流分层系统在逆变侧高低端换流器控制的相对独立,在实际的运行过程中会发生控制方式切换,需要研究不同策略下交直流的相互影响特性,选择合适的直流电流转移方案。首先基于直流控制系统及分层接入系统的模型.分析了在不同直流控制权转移方案下特高压分层直流的Ud-Id特性曲线。然后,基于直流分层接入模型分析了不同的转移方案对受端各层换流母线电压及输出功率的影响。研究结果表明:不同直流电流转移方案下直流的功率输出影响差异较小,但受端各层换流母线电压的变化差别较大。最后,在提升直流功率时,根据各层交流系统状态给出合适的电流控制转移方案。Due to the relative independence of the converter control in the high and low end of the inverter side of the UHVDC hierarchical system,in the actual operation process,the control mode will be switched. It is necessary to study the interaction characteristics of AC and DC under different strategies and select the appropriate DC current transfer scheme.The model of DC control system and layered access system is proposed firstly.The Ud-Id characteristic curve of UHV stratified DC under different DC control transfer schemes is analyzed And then based on the DC hierarchical access model,the influence of different transfer schemes on the voltage and output power of each layer of converter bus at the receiving end is analyzed.The results show that the influence of DC power output on different DC current transfer schemes is small.However,the voltage variation of each layer of converter bus at the receiving end is quite different Finally,when the DC power is increased,the appropriate current control transfer scheme is given according to the state of each layer of AC system.

关 键 词：特高压 直流输电 分层接入 控制方式 运行特性 

分 类 号：TM7[电气工程—电力系统及自动化]