基于MMC的多端直流输电系统控制策略研究  

A control stratege research of multi-terminal DC transmission system based on MMC

作　　者：袁斌华[1] 李高清[1] 薛彪[1] 

机构地区：[1]陇东学院电气工程学院,甘肃庆阳745000

出　　处：《工业仪表与自动化装置》2016年第4期3-8,共6页Industrial Instrumentation & Automation

基　　金：陇东学院青年科技创新项目资助课题(XYBY140207)

摘　　要：在长距离的直流输电系统中,直流线路上的电阻对电压偏差控制的精度带来了较大的影响。该文提出了一种改进的电压偏差控制方法,推导了三端直流输电系统的dq坐标数学模型,充分考虑了直流电阻对控制参考值的影响,对电压偏差控制的取值进行了计算,并实现修正。在PSCAD/EMTDC环境中建立基于MMC的三端直流系统仿真模型,仿真结果验证了所提出的控制方法的可行性,能够有效避免直流电压偏差控制器中由于上下限动作电压选择不当而影响系统的动态响应,提升了系统的稳定性。In the long-distance HVDC system,DC line resistance make significant impacts on the precision of voltage deviation control,therefore,an improved method of voltage deviation control is proposed. In this paper,the MMC based three-terminal DC power transmission system（ MMC-MTDC） make a mathematical model in dq coordinate. With adequate consideration of the influence of DC line resistance,the value of voltage deviation is calculated and revised in controller. A simulation model of modular multilevel converter（ MMC） based MTDC system in PSCAD / EMTDC is established to verify the correctness and validity of the proposed control method. The results show that with this method control characteristic deviations caused by unsuitable setting of voltage deviation value could be avoided,and the control mode could be quickly switched under large power disturbance to improve the system stability.

关 键 词：高压直流输电(HVDC) 多端直流输电系统(MMC-HVDC) 电压偏差控制 改进电压偏差控制 

分 类 号：TM76[电气工程—电力系统及自动化]