TY - JOUR
T1 - Robust Power Flow Control of Grid-Connected Inverters
AU - Wang, Yeqin
AU - Ren, Beibei
AU - Zhong, Qing Chang
N1 - Publisher Copyright:
© 2016 IEEE.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016/11
Y1 - 2016/11
N2 - In this paper, an uncertainty and disturbance estimator (UDE)-based robust power flow control is developed for grid-connected inverters to achieve accurate power delivery to the grid. The model of power delivering with both frequency dynamics and voltage dynamics is derived at first. The UDE method is introduced into the controller design to deal with model uncertainties (e.g., output impedance and power angle), coupling effects, and external disturbances (e.g., the fluctuation of the dc-link voltage, the variation of output impedance/line impedance, and the variations of both frequency and amplitude in the grid voltage). Also, this controller does not need a voltage regulator or a current regulator and is easy for the implementation and parameter tuning through the design of the desired tracking error dynamics and the UDE filters. Experimental results are provided to show the effectiveness of the proposed method for different disturbance rejection scenarios, the low-voltage fault-ride through capability, and the weak grid operation capability. The good robustness of the UDE-based control is also demonstrated through the comparison with two other controllers: the proportional-integral controller and the active disturbance rejection controller.
AB - In this paper, an uncertainty and disturbance estimator (UDE)-based robust power flow control is developed for grid-connected inverters to achieve accurate power delivery to the grid. The model of power delivering with both frequency dynamics and voltage dynamics is derived at first. The UDE method is introduced into the controller design to deal with model uncertainties (e.g., output impedance and power angle), coupling effects, and external disturbances (e.g., the fluctuation of the dc-link voltage, the variation of output impedance/line impedance, and the variations of both frequency and amplitude in the grid voltage). Also, this controller does not need a voltage regulator or a current regulator and is easy for the implementation and parameter tuning through the design of the desired tracking error dynamics and the UDE filters. Experimental results are provided to show the effectiveness of the proposed method for different disturbance rejection scenarios, the low-voltage fault-ride through capability, and the weak grid operation capability. The good robustness of the UDE-based control is also demonstrated through the comparison with two other controllers: the proportional-integral controller and the active disturbance rejection controller.
KW - Fluctuation of dc-link voltage
KW - grid disturbances
KW - model uncertainties
KW - uncertainty and disturbance estimator (UDE)
KW - variation of the impedance
UR - http://www.scopus.com/inward/record.url?scp=84994462103&partnerID=8YFLogxK
U2 - 10.1109/TIE.2016.2586439
DO - 10.1109/TIE.2016.2586439
M3 - Article
AN - SCOPUS:84994462103
VL - 63
SP - 6887
EP - 6897
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
SN - 0278-0046
IS - 11
M1 - 7501804
ER -