TY - JOUR
T1 - A Coordinating Control for Hybrid HVdc Systems in Weak Grid
AU - Kaur, Jagdeep
AU - Chaudhuri, Nilanjan Ray
N1 - Funding Information:
This work was supported by the National Science Foundation under Grant ECCS 1656983.
Funding Information:
Manuscript received August 1, 2018; revised November 22, 2018; accepted December 16, 2018. Date of publication January 10, 2019; date of current version June 28, 2019. This work was supported by the National Science Foundation under Grant ECCS 1656983. (Corresponding author: Nilanjan Ray Chaudhuri.) The authors are with the School of Electrical Engineering and Computer Science, Pennsylvania State University, University Park, PA 16802 USA (e-mail:,juk415@psu.edu; nuc88@engr.psu.edu).
Publisher Copyright:
© 2018 IEEE.
PY - 2019/11
Y1 - 2019/11
N2 - A coordinating control strategy is proposed for a hybrid high voltage dc (HVdc) system comprising a capacitor commutated converter connected in series with a two-stage voltage source converter called "Vernier." This approach ensures that 1) the tap changers and switched capacitor banks are eliminated by Vernier controls that maintain constant firing angle and margin angle at the rectifier and inverter, respectively, and provide volt-VAr control at the commutation bus, and 2) improves the power flow recovery and risk of commutation failure following sever faults. To that end, a detailed switched model of hybrid-HVdc is built in EMTDC/PSCAD platform. For the frequency-domain analysis, a new nonlinear state-space averaged model is also developed and benchmarked against the detailed model. The steady-state operating characteristics of the proposed hybrid HVdc system are established. Finally, the effectiveness of the proposed approach is demonstrated for weak ac systems interfacing the rectifier and inverter sides. Improvement in commutation failure and power flow recovery following severe disturbances are also shown through case studies.
AB - A coordinating control strategy is proposed for a hybrid high voltage dc (HVdc) system comprising a capacitor commutated converter connected in series with a two-stage voltage source converter called "Vernier." This approach ensures that 1) the tap changers and switched capacitor banks are eliminated by Vernier controls that maintain constant firing angle and margin angle at the rectifier and inverter, respectively, and provide volt-VAr control at the commutation bus, and 2) improves the power flow recovery and risk of commutation failure following sever faults. To that end, a detailed switched model of hybrid-HVdc is built in EMTDC/PSCAD platform. For the frequency-domain analysis, a new nonlinear state-space averaged model is also developed and benchmarked against the detailed model. The steady-state operating characteristics of the proposed hybrid HVdc system are established. Finally, the effectiveness of the proposed approach is demonstrated for weak ac systems interfacing the rectifier and inverter sides. Improvement in commutation failure and power flow recovery following severe disturbances are also shown through case studies.
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U2 - 10.1109/TIE.2018.2890496
DO - 10.1109/TIE.2018.2890496
M3 - Article
AN - SCOPUS:85068639268
SN - 0278-0046
VL - 66
SP - 8284
EP - 8295
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 11
M1 - 8608004
ER -