Open AccessWind power grid-connected frequency regulation strategy based on ESO control and PI control
Author(s) -
Maoda Xu,
Hui Yang,
Wenbo Hao,
Xiaoyang Zhao,
Siyao Yu
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/371/5/052036
Subject(s) - control theory (sociology) , inner loop , linearization , pid controller , grid , automatic frequency control , controller (irrigation) , wind power , loop (graph theory) , state observer , internal model , control (management) , power (physics) , frequency grid , computer science , engineering , control engineering , physics , mathematics , nonlinear system , temperature control , telecommunications , geometry , electrical engineering , quantum mechanics , artificial intelligence , combinatorics , agronomy , biology
Frequency fluctuation of wind power grid-connected system is difficult to adjust, aiming at this problem, this paper proposed a control strategy based on the combination of inner loop control and outer loop to restrain frequency fluctuation. extended state observer (ESO) is used as the outer loop. The error and disturbance which cannot be reflected directly in the system structure are estimated by linearization. The inner loop PI controller is designed through the parameters of proportional link and integral link to realize the reasonable allocation of internal model poles and achieve better damping effect. Simulation show that the control strategy can effectively suppress the system frequency fluctuation caused by load fluctuation and maintain frequency stable. The research results can be used to guide engineering practice.