TY - JOUR
T1 - Minimum-loss control strategy for a dual-VSI DFIG DC System
AU - Marques, Gil
AU - Cruz, Sergio
AU - Iacchetti, Matteo
N1 - Funding Information:
Manuscript received March 9, 2019; revised May 14, 2019, July 22, 2019, and September 30, 2019; accepted October 24, 2019. Date of publication November 15, 2019; date of current version June 3, 2020. This work was supported in part by national funds through Fundação para a Ciência e a Tecnologia (FCT) under Grant UID/CEC/50021/2019 and in part by FCT/MEC through national funds and when applicable co-funded by FEDER – PT2020 partnership agreement under the Project UID/EEA/50008/2019. (Corresponding author: Gil D. Marques.) G. D. Marques is with the INESC-ID, Instituto Superior Técnico (IST), Universidade de Lisboa, 1049-001 Lisbon, Portugal (e-mail: [email protected]).
Publisher Copyright:
© 1982-2012 IEEE.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - This article addresses the minimum-loss control of the dual voltage-source inverter (VSI) and doubly fed induction generator (DFIG) system connected to a dc link. The minimum-loss operating conditions for field-oriented control based on the airgap flux are obtained analytically using Lagrange multipliers and validated with numerical optimization. As the main contribution of this article, the analysis accounts for core and VSI losses, providing the optimal stator frequency law and rotor/stator d-axis current split ratio, and an implicit expression for the optimal flux trajectory formulated as equality between suitable d-axis and q-axis loss functions. In the proposed implementation, this implicit condition is enforced by using a proportional-integral controller and avoiding look-up tables. Furthermore, the stator and rotor VSI controls are implemented in two independent digital signal processors with no communication, which may ease the use of off-the-shelf VSI units. The optimal conditions and control strategy are fully validated by simulations and experiments on a prototype. The main scope of application is wind-energy dc-grid technology.
AB - This article addresses the minimum-loss control of the dual voltage-source inverter (VSI) and doubly fed induction generator (DFIG) system connected to a dc link. The minimum-loss operating conditions for field-oriented control based on the airgap flux are obtained analytically using Lagrange multipliers and validated with numerical optimization. As the main contribution of this article, the analysis accounts for core and VSI losses, providing the optimal stator frequency law and rotor/stator d-axis current split ratio, and an implicit expression for the optimal flux trajectory formulated as equality between suitable d-axis and q-axis loss functions. In the proposed implementation, this implicit condition is enforced by using a proportional-integral controller and avoiding look-up tables. Furthermore, the stator and rotor VSI controls are implemented in two independent digital signal processors with no communication, which may ease the use of off-the-shelf VSI units. The optimal conditions and control strategy are fully validated by simulations and experiments on a prototype. The main scope of application is wind-energy dc-grid technology.
KW - DC power system
KW - doubly fed induction generator (DFIG)
KW - dual voltage-source inverter (VSI) DFIG
KW - efficiency improvement
KW - field-weakening
UR - http://www.scopus.com/inward/record.url?scp=85083031469&partnerID=8YFLogxK
U2 - 10.1109/TIE.2019.2952822
DO - 10.1109/TIE.2019.2952822
M3 - Article
SN - 0278-0046
VL - 67
SP - 8175
EP - 8185
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 10
M1 - 8902184
ER -
