TY - GEN
T1 - Disturbance-Observer Based control for PWM Rectifiers Under Unbalanced Grid Conditions
AU - Razehi, Mohammed Al
AU - Errouissi, Rachid
AU - Debouza, Mahdi
AU - Shareef, Hussain
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - This paper presents the design and experimental validation of a current control technique for Pulse-width modulated (PWM) rectifiers under both balanced and unbalanced grid voltages. In particular, unbalanced grid voltages can cause double fundamental frequency oscillations in the DC-link voltage. These DC-link voltage oscillations can be removed by setting the grid current to accurately track a specific current reference. In this paper, the proposed controller utilizes a cascaded control scheme comprising of an outer voltage loop and an inner current loop. The outer loop controller is designed to generate the specific current reference needed to maintain the DC-link voltage constant and at its reference. The inner current loop consists of a state-feedback controller coupled with a disturbance observer to ensure accurate tracking of the current reference. The current controller is designed in the αβ reference to ensure accurate regulation of both balanced and unbalanced grid currents needed to suppress the DC-link voltage oscillations. To validate the effectiveness of the proposed controller, experimental tests were conducted and showcased that the control scheme is able to achieve the desired control objectives with excellent results.
AB - This paper presents the design and experimental validation of a current control technique for Pulse-width modulated (PWM) rectifiers under both balanced and unbalanced grid voltages. In particular, unbalanced grid voltages can cause double fundamental frequency oscillations in the DC-link voltage. These DC-link voltage oscillations can be removed by setting the grid current to accurately track a specific current reference. In this paper, the proposed controller utilizes a cascaded control scheme comprising of an outer voltage loop and an inner current loop. The outer loop controller is designed to generate the specific current reference needed to maintain the DC-link voltage constant and at its reference. The inner current loop consists of a state-feedback controller coupled with a disturbance observer to ensure accurate tracking of the current reference. The current controller is designed in the αβ reference to ensure accurate regulation of both balanced and unbalanced grid currents needed to suppress the DC-link voltage oscillations. To validate the effectiveness of the proposed controller, experimental tests were conducted and showcased that the control scheme is able to achieve the desired control objectives with excellent results.
KW - Disturbance observer
KW - feedback linearization
KW - PWM rectifier
KW - sinusoidal disturbance rejection
KW - unbalanced grid voltages
UR - http://www.scopus.com/inward/record.url?scp=85146371013&partnerID=8YFLogxK
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U2 - 10.1109/ICECTA57148.2022.9990407
DO - 10.1109/ICECTA57148.2022.9990407
M3 - Conference contribution
AN - SCOPUS:85146371013
T3 - 2022 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2022
SP - 39
EP - 44
BT - 2022 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2022
Y2 - 23 November 2022 through 25 November 2022
ER -