电力系统自动化2017，Vol.41Issue(13)：142-149,161,9.DOI:10.7500/AEPS20160729004
参与电网调频的多端柔性直流输电系统自适应下垂控制策略
Adaptive Droop Control Strategy Participating in Power Grid Frequency Regulation for VSC-MTDC Transmission System
摘要
Abstract
In view of the voltage source converter based multi-terminal direct current (VSC-MTDC) transmission system connected with large-scale offshore wind farms, the power distribution mechanism of the conventional DC voltage droop control is derived, and the impacts of the control strategy on the frequency of receiving grid are analyzed.The DC capacitor of the VSC-MTDC system is used for energy storage, and the frequency of receiving grid is coupled with the DC voltage of VSC-MTDC system.Then an adaptive droop control strategy participating in the primary frequency regulation is proposed.The strategy can adjust the DC voltage droop coefficient in real time according to the AC system frequency deviation, which makes each converter station rapidly adjust its own power output without communication.Thus the AC system frequency can be stabilized in a reasonable range.Finally, a five-terminal VSC-MTDC system is formed in the DigSILENT/PowerFactory simulation software, and the effectiveness of the proposed method is verified by results of three simulation examples.关键词
海上风电场/多端柔性直流输电系统/电压下垂控制/一次调频/虚拟惯性Key words
offshore wind farm/voltage source converter based multi-terminal direct current (VSC-MTDC) transmission system/voltage droop control/primary frequency regulation/virtual inertia引用本文复制引用
王炜宇,李勇,曹一家,许志伟,谭益..参与电网调频的多端柔性直流输电系统自适应下垂控制策略[J].电力系统自动化,2017,41(13):142-149,161,9.基金项目
国家自然科学基金资助项目(51520105011) （51520105011）
湖南省科技重大专项资助项目(2015GK1002) （2015GK1002）
"湖湘青年英才"支持计划资助项目(2015RS4022).This work is supported by National Natural Science Foundation of China (No.51520105011), Hunan Provincial Major Projects of Science and Technology (No.2015GK1002), and Hunan Youth Talent Project (No.2015RS4022). （2015RS4022）
