Dynamic Power Flow Algorithm With Coordinated Regulation of Power System Frequency With DFIG and VSC-HVDC

被引：0
|
作者：
Li S. [1 ]
Sun T. [1 ]
Huang J. [1 ]
Zhang H. [1 ]
Qi T. [1 ]
Shang Y. [1 ]
机构：
[1] School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, 230009, Anhui Province
来源：
Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Doubly-fed induction generator(DFIG); Dynamic power flow; Frequency regulation; Inertia constant; Voltage source converter-high voltage direct current(VSC-HVDC);
D O I：
10.13335/j.1000-3673.pst.2019.0373
中图分类号：
学科分类号：
摘要：
For the doubly-fed induction generator (DFIG) grid-integrated through voltage source converter-HVDC (VSC-HVDC), based on cascaded droop control (grid frequency-DC voltage-wind farm) for fre¬quency regulation, a dynamic power flow model with DFIG participating in primary frequency regulation through VSC-HVDC is proposed to quantify frequency response of the power grid with coordinated control of the active power reserve of DFIG and the virtual inertia of DC capacitor. Considering the active power reserve of DFIG, within the range of DC voltage constraint, an upper limit of the virtual inertia constant of DC capacitor is proposed. Considering the rotor speed variation of DFIG during frequency regulation, an algorithm of dynamic correction to the inertia time constant of DFIG based on the stored kinetic energy of rotor is proposed to improve accuracy of dynamic power flow result. Numerical analysis verifies feasibility of analyzing the coordinated frequency regulation capability of DFIG and VSC-HVDC with the proposed algorithm. It is verified that the inertia level of the AC system is improved by applying the maximum equivalent inertia constant of the virtual inertia control with DC capacitor, taking the frequency regulation of DFIG into consideration. The correction to the equivalent inertia time constant of DFIG is consistent with its dynamic frequency regulation characteristics. © 2019, Power System Technology Press. All right reserved.
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页码：4433 / 4439
页数：6
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