摘要
传统直流输电技术在功率调节速度、损耗、保护和控制等方面存在一定的不足。柔性直流输电系统的出现不仅解决了上述缺陷,而且具有功率独立可控、可向无源网络供电等优势,在新能源分布式发电、微电网等领域得到广泛应用。本文通过建立两端柔直数学模型,研究电压源型换流器(voltage source converter,VSC)控制策略。考虑传统无差拍控制运用于VSC换流器时具有控制延时以及电流闭环控制响应性差等问题,文中提出一种改进无差拍控制策略,通过预测k+2时刻采样电流,解决上述缺陷。最后通过联合仿真,验证所提方法的正确性与可靠性。
There are obvious defects in the traditional HVDC technology in power regulating speed,reduce the loss,protectionand control,has been unable to meet the electricity demand diversity. Emergence of VSCHVDC not only solves the defects,but also has the power of independent controllable and has the advantage to supply power to a passive network etc,widely usedin power generation,new energy and other fields of distributed micro grid. In this paper,double end DC is taken as theresearch object,and the mathematical model of both ends flexible and straight is set up. On this basis,the basic operationmode of the system and the control strategy of the voltage source type （ VSC）converter are studied. Considering the controldelay of the VSC converter and the poor responsiveness of the current closed loop control,an improved deadbeat control strategyis proposed to solve the above defects by predicting the k＋2 time sampling current. Finally,the correctness and reliability of theabove methods are verified by CO simulation.
作者
张汀荃
张汀荟
张海龙
顾佳易
ZHANG Tingquan;ZHANG Tinghui;ZHANG Hailong;GU Jiayi(Nari School of Electrical Engineering and Automation,Nanjing Normal University,Nanjing 210042,China;School of Electrical Engineering,Nanjing Institute of Technology,Nanjing 211167,China)
出处
《电力工程技术》
2018年第4期84-89,共6页
Electric Power Engineering Technology
基金
国家自然科学基金资助项目(51707089)
