Keywords
power system;frequency regulation characteristics;frequency-adjustable power generation by new energy sources;doubly-fed induction generator;wind power penetration
Abstract
The basic mathematical model of doubly-fed induction generator (DFIG) participating in grid frequency regulation is presented. The relationship between wind power penetration, the proportion of wind turbines with adjustable frequency ability, the frequency regulation coefficient of wind turbines, and wind power utilization is derived under different operating modes (such as inertia control or maximum power tracking) after large-scale wind power is connected to the grid. The control strategies for wind turbines to participate in grid frequency regulation under different operating modes are proposed. Taking a grid in southern China as an example, the impact characteristics of wind power injection ratio on grid frequency regulation under changing wind speed and load conditions are analyzed, and the effectiveness of renewable energy generation with adjustable frequency ability in grid frequency regulation is verified. By connecting wind turbines with adjustable frequency ability to a 4-machine 2-area grid model, the minimum proportion of required wind turbines and the comprehensive carrying capacity of the grid for renewable energy under different wind power injection ratios are presented. Simulation results show that when large-scale wind farms participate in frequency regulation, it is advisable to involve turbines operating near rated wind speed to minimize grid frequency deviation and maintain frequency within the safe operating range.
DOI
10.19781/j.issn.1673-9140.2024.03.019
First Page
168
Last Page
176,186
Recommended Citation
HE, Xin; LIU, Cui; and LI, Yun
(2024)
"Study on frequency regulation characteristics of power grids after large‑scale new energy integration under different operation modes,"
Journal of Electric Power Science and Technology: Vol. 39:
Iss.
3, Article 19.
DOI: 10.19781/j.issn.1673-9140.2024.03.019
Available at:
https://jepst.researchcommons.org/journal/vol39/iss3/19