Periodical Searching Based Nonlinear Droop Control for Multi-terminal Flexible DC Transmission System

被引：0
作者：
Zhu J. [1 ]
Li F. [1 ]
Yu L. [1 ]
Liang J. [2 ]
Liu N. [3 ]
Wang C. [1 ]
机构：
[1] School of Electrical and Information Engineering, Tianjin University, Tianjin
[2] Electric Power Research Institute, State Grid Hebei Electric Power Supply Co., Ltd., Shijiazhuang
[3] State Grid Beijing Electric Power Company, Beijing
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2023年 / 47卷 / 01期
基金：
中国国家自然科学基金;
关键词：
droop control; flexible direct current transmission; multi-terminal coordination control; periodical searching; power control; voltage source converter (VSC);
D O I：
10.7500/AEPS20210730004
中图分类号：
学科分类号：
摘要：
When the voltage source converter based multi-terminal high voltage direct current (VSC-MTDC) system adopts the linear droop control strategy of active power and DC voltage, the accuracy of the power-sharing among converter stations will be affected by the DC network characteristics. In the scenario that the DC network topology is unknown, a generalized mathematical model between the active power and the DC voltage of the converter station is established. Under the influence of DC network characteristics, the nonlinear feature of active power and DC voltage droop characteristic of the converter station is analyzed. On this basis, a periodical searching based nonlinear droop control strategy for the VSC-MTDC system is proposed, in which the accurate droop characteristic curve of the converter station operating within the possible ranges can be obtained through the searching technique without the prior knowledge of DC network topology and its parameters. Then the accurate active power control of the converter station can be ultimately implemented after the obtained accurate droop characteristic curve is updated to the bottom controller of the converter station. By establishing a four-terminal VSC-MTDC system model with a ring network in MATLAB/Simulink, not only the analysis conclusion of the nonlinear feature for the active power and DC voltage droop characteristics of the converter station is verified, but also the accuracy of the proposed control strategy in restoring nonlinear droop characteristics of converter station as well as power control compared with the traditional linear droop control strategy is demonstrated. © 2023 Automation of Electric Power Systems Press. All rights reserved.
引用
收藏
页码：143 / 152
页数：9
相关论文
共 23 条
  • [21] ZHU J B，, GUERRERO J M，, HUNG W，, Et al., Generic inertia emulation controller for multi-terminal voltage-source-converter high voltage direct current systems ［J］, IET Renewable Power Generation, 8, 7, pp. 740-748, (2014)
  • [22] ZHU J B, BOOTH C D, ADAM G P，, Et al., Coordinated direct current matching control strategy for multi-terminal DC transmission systems with integrated wind farms［J］, Electric Power Systems Research, 124, pp. 55-64, (2015)
  • [23] System design standard for ±800 kV HVDC system：DL/T 5426—2009［S］, (2009)
123