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Research on Robust LQR Method for EnergyStorage System in Islanding Operation(PDF)

南京师范大学学报(工程技术版)[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2019年02期
Page:
1-
Research Field:
电气与电子工程
Publishing date:

Info

Title:
Research on Robust LQR Method for EnergyStorage System in Islanding Operation
Author(s):
Yang XuJu Rong
School of Electrical and Automation Engineering,Nanjing Normal University,Nanjing 210023,China
Keywords:
super capacitor energy storage systemuncertainty problemrobust LQR controlmulti-cell modellinear matrix inequality
PACS:
TM53
DOI:
10.3969/j.issn.1672-1292.2019.02.001
Abstract:
The main function of the energy storage system is to keep the bus voltage stable when micro-grid is in islanding operation. In view of the change of the system parameters related to super capacitor terminal voltage and bus side load in the operation of the super capacitor energy storage system which causes the fluctuation of bus voltage,a robust LQR control method is presented. Firstly,the small signal model of the converter is established. Secondly,the super capacitor terminal voltage and the bus side load are selected as uncertainties and a multi-cell model of energy storage system is deduced by the theory of convex optimization. Finally,the LQR controller satisfying the constraint condition is calculated by using linear matrix inequality(LMI)method. The simulation results show that the control method proposed in this paper can stabilize the bus voltage faster and better when there are parameter changes or even external disturbances in the system,and that the control effect is superior to the traditional PI control method.

References:

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Last Update: 2019-06-30