VSC-MTDC系统直流电压自适应斜率控制策略  

An Adaptive DC Voltage Droop Control Strategy for the VSC?MTDC System

作　　者：朱瑞可[1] 王渝红[1] 李兴源[1] 贺之渊 应大力[3] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065 [2]国网智能电网研究院,北京市102200 [3]解放军后勤工程学院,重庆市404100

出　　处：《电力系统自动化》2015年第4期63-68,共6页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2013CB2280204);国家电网公司科技项目~~

摘　　要：针对电压源型换流器多端直流系统,提出了一种直流电压自适应斜率控制策略。该控制策略考虑了换流站运行工况及功率裕度,将稳定直流电压的任务分配给多个换流站,保证了功率裕度较少的换流站分担较少的不平衡功率,功率裕度较大的换流站则承担较多的不平衡功率,实现了不平衡功率的合理分配,避免换流站在按照固定直流电压斜率运行时因满载无法对直流网络潮流变化进行响应的情况。最后在PSCAD/EMTDC中以一个四端柔性直流输电系统为例进行仿真,验证了所提出的控制策略的有效性。An adaptive direct current （DC） voltage droop control strategy for sharing the unbalanced power according to the available headroom of each converter station is proposed for the voltage source converter based multi-terminal high voltage direct current（VSC-MTDC） system.The converters already operating close to the rating would share less unbalanced power than the extent of the other converters with more spare headroom,thus avoiding out of action to DC system changes which may take place with a fixed value of power-voltage droop.Finally,simulations are performed in PSCAD/EMTDC to verify the validity of the control strategy under different operating conditions.Simulation results show that the adaptive droop control strategy performs well when the VSC-MTDC system is operating under different conditions.

关 键 词：电压源型换流器 多端直流 自适应斜率 功率裕度 

分 类 号：TM721.1[电气工程—电力系统及自动化]