VSC-MTDC系统后备站改进控制策略  

A Novel Margin Droop Control Strategy for VSC-MTDC System

作　　者：罗志宏 朱瑞可[2] 

机构地区：[1]成都供电公司,四川成都610000 [2]四川大学电气信息学院,四川成都610065

出　　处：《电力科学与工程》2015年第4期37-42,共6页Electric Power Science and Engineering

摘　　要：针对VSC-MTDC系统,提出了一种考虑后备换流站功率裕度的改进直流电压偏差斜率控制策略。正常运行的情况下,由主导站承担稳定直流电压的任务,在主导站失去稳定直流电压的能力时,将稳定直流电压的任务分配给多个后备换流站,保证了功率裕度较少的后备站分担较少的不平衡功率,功率裕度较大的后备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。最后在PSCAD/EMTDC中以一个四端柔性系统为例进行仿真,结果表明所提控制策略在稳态和暂态过程中均有良好的控制效果。A novel margin droop control strategy taking into account the available headroom of converter station is proposed for VSC-MTDC system.The leading converter undertakes the task of stable dc voltage preferentially. When the leading converter loss loses control, the other standby converters that have power regulation ability share the task of stable dc voltage.The standby converter already operating close to the rating shares little unbalanced wind power, meanwhile the standby converter that has much available headroom has an unbalanced share of power. The advantages of this novel scheme for appropriate power sharing are established through transient simulations in PSCAD/EMTDC on an MTDC grid with four converters.

关 键 词：电压源型换流器 多端直流 功率裕度 偏差斜率控制 

分 类 号：TM721[电气工程—电力系统及自动化]