基于免通信的VSC-MTDC系统暂态无功控制策略  

Transient Reactive Power Control Strategy of Communication-free Based VSC-MTDC System

作　　者：余蕾 刘志强[2] YU Lei;LIU Zhiqiang(Qinzhou Health School,Guangxi Qinzhou 535000,China;North China Electrical Power University State Key Laboratory of New Energy Power System,Beijing 102206,China)

机构地区：[1]钦州市卫生学校,广西钦州535000 [2]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《电力电容器与无功补偿》2021年第4期134-140,146,共8页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金(51777064);国家重点研发计划项目(2016YFB0900602)。

摘　　要：最新研究表明无功控制是提高VSC-MTDC系统暂态稳定的重要手段之一。然而,目前无功控制受通信延迟影响,暂态稳定控制效果欠佳。针对此,本文提出基于免通信的VSC-MTDC系统暂态无功控制策略。该策略充分利用直流侧电压降压控制中的局部辅助有功调制信息,仅需局部测量值即可估计得到全局频率加权值,并以该频率加权值作为换流站辅助无功功率控制的参考值进行控制。基于PSS/E对所提控制方法进行仿真验证,结果表明该方法与使用全局测量信息的控制策略性能相近,可显著提高系统暂态稳定性。The recent research shows that the reactive power control is one of the important means to improve the transient stability of VSC-MTDC system.However,the transient stability control effect of current reactive power control is weak due to communication delay.In view of this,the transient reactive power control strategy of communication-free based VSC-MTDC system is proposed in this paper.The strategy makes full use of the local auxiliary active power modulation information in the control of voltage drop of DC side.Only local measurements are needed to estimate the global frequency weighted value,and the frequency weighted value is used as the reference value of auxiliary reactive power control in converter station for the purpose of control.The proposed control method is simulated and verified based on PSS/E.The result shows that the control strategy performance of the method is very close to that using the global measurement information,which can improve significantly the transient stability of the system.

关 键 词：免通信 VSC-MTDC 暂态稳定 无功控制 

分 类 号：TM712[电气工程—电力系统及自动化]