|Table of Contents|

Double-layer power distribution strategy for primary frequencymodulation in wind farms considering unit stability constraints(PDF)

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2020年06期
Page:
724-732
Research Field:
Publishing date:

Info

Title:
Double-layer power distribution strategy for primary frequencymodulation in wind farms considering unit stability constraints
Author(s):
Zhang Tianhai1Yu Guoqiang1Xu Chang2Hu Zunmin1Zhang Junfang2
1.Jiangsu Frontier Electric Technology Co.,Ltd.,Nanjing 211102,China; 2.School of Automation,Nanjing University of Science and Technology,Nanjing 210094,China
Keywords:
units stability constraints wind farms primary frequency regulation active power distribution releasing kinetic energy real-time correction
PACS:
TM614
DOI:
10.14177/j.cnki.32-1397n.2020.44.06.012
Abstract:
In order to improve the stability and reliability of the wind farm participating in the primary frequency regulation of power grids,a double-layer power distribution strategy of the wind farm considering the stability constraints of the units is proposed. The influence of the continuous reduction of wind speed on the stable operation of low wind speed units is analyzed during the period of frequency regulation in combination with the distribution of the stability region of the wind turbine units. According to the released kinetic energy of each wind turbine,the optimal allocation of the power command of the wind turbine in the wind farm is realized by taking the optimization objectives as the minimum output error of the wind farm,the minimum number of units participating in the frequency regulation and the minimum number of control mode switching. At the same time,the power command is corrected in real time by collecting the rotation speed of each unit. Different distribution strategies are simulated and compared under the turbulent wind speed. The results show that the proposed method can effectively avoid the wind turbine in the low wind speed section from losing its stability due to the excessive release of kinetic energy.

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Last Update: 2020-12-30