考虑锁相环动态的柔性直流输电机电暂态模型  

Electromechanical Transient Model of VSC-HVDC Considering Dynamics of Phase-Locked Loop

作　　者：王铁柱 卜广全 董毅峰 侯俊贤 王毅 穆世霞 WANG Tiezhu;BU Guangquan;DONG Yifeng;HOU Junxian;WANG Yi;MU Shixia(State Key Laboratory of Power Grid Security and Energy Conservation （China Electric Power Research Institute）, Haidian District, Beijing 100192)

机构地区：[1]电网安全与节能国家重点实验室(中国电力科学研究院有限公司)

出　　处：《电网技术》2018年第7期2055-2061,共7页Power System Technology

基　　金：国家重点研发计划项目(2016YFB0900600);国家电网公司科技项目(±500 kV柔性直流电网仿真技术研究(XT71-15-066))~~

摘　　要：在进行柔性直流输电系统的规划设计、调度运行以及稳定性分析与研究等工作时,离不开准确可靠的柔性直流输电机电暂态模型。柔性直流输电系统中,锁相环（phase locked loop,PLL）模块起着测量并向控制系统提供相位信息的作用,其对相位信息的测量不是完全理想的,而是存在动态过程。现有的柔性直流输电机电暂态模型中均忽略了锁相环对相位信息的动态测量误差,这与实际动态过程不符,在一定程度上降低了柔性直流输电系统机电暂态模型的仿真精度。该文分析了忽略锁相环动态对柔性直流输电系统机电暂态模型仿真精度的影响,并提出了在机电暂态模型中考虑锁相环动态的方法。通过与电磁暂态模型的仿真对比以及大电网算例仿真,验证了所提出的考虑锁相环动态后的柔性直流输电机电暂态模型的准确性和适用性。In process of VSC-HVDC transmission system planning and design, operation and stability analysis and research work, accurate and reliable electromechanical transient model is indispensible. In VSC-HVDC transmission systems, phase locked loop（PLL） module plays the role of measuring and providing phase information to control system. Its phase information measurement is not completely ideal, but has a dynamic process. Existing electromechanical transient（EMT） models of VSC-HVDC all neglect dynamic measurement error of PLL phase information. This is inconsistent with actual dynamic process and reduces simulation accuracy of EMT model in a certain extent. In this paper, influence of PLL dynamic omission on simulation accuracy of EMT model is analyzed. A method considering PLL dynamics in EMT model is proposed. Comparing with EMT model and a large power grid simulation, the proposed model is verified to be accurate and suitable for EMT simulation of large grid.

关 键 词：柔性直流输电 锁相环 动态过程 机电暂态 仿真模型 

分 类 号：TM721[电气工程—电力系统及自动化]