Combined Control Strategy for Frequency Regulation of Multi-wind Farms Connected to Multi-terminal Flexible DC

被引：0
|
作者：
Lang Y. [1 ]
Yang D. [2 ]
Yang X. [1 ]
Wen B. [2 ]
Zhao K. [1 ]
机构：
[1] China Electric Power Research Institute, Haidian District, Beijing
[2] College of Information and Electrical Engineering, China Agricultural University, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 12期
关键词：
Combined control; DFIG; Frequency modulation factor; Multi-terminal flexible DC; Variable droop control; VSG;
D O I：
10.13335/j.1000-3673.pst.2018.2696
中图分类号：
学科分类号：
摘要：
A large number of wind farms supplying power to AC power through multi-terminal flexible DC system will decouple the frequency relationship between the wind farms and the AC grid. DC voltage control is more complicated when there are many wind farms connected to flexible DC systems. In this paper, a combined control strategy is proposed with the multi-terminal DC system participating in frequency regulation of the AC grid and coordinating stability of DC voltage at converter station failure. Firstly, the grid side VSC (GSVSC) connected to the AC grid adopts an improved virtual synchronous generator (VSG) variable droop strategy, cooperating improved variable droop control to respond to DC voltage fluctuations. It can selectively provide inertial response to AC grid frequency according to frequency fluctuations. Secondly, for the problem that traditional voltage drop control is not suitable to the flexible DC system with wind farms, the improved voltage-frequency droop control strategy is applied to the VSCs connected to the wind farms (WFVSCs). The wind farms use frequency regulation factor inertia control to change the output in real time according to wind speed. Finally, simulation analysis is carried out on PSCAD/EMTDC to verify correctness and effectiveness of the proposed control strategy. © 2019, Power System Technology Press. All right reserved.
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页码：4468 / 4477
页数：9
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