Title Optimal Power Flow and Unified Control Strategy for Multi-Terminal HVDC Systems
Authors Raza, Ali, Mustafa, Ali, ROUZBEHI, KUMARS, Jamil, Mohsin, Gilani, Syed Omer, Abbas, Ghulam, Farooq, Umar, Shehzad, Muhammad Naeem, ROUZBEHI, KUMARS
External publication No
Means IEEE Access
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 3.74500
Area International
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070214092&doi=10.1109%2fACCESS.2019.2925049&partnerID=40&md5=123a289f19123a996740f1753b53ac2f
Publication date 01/01/2019
ISI 000477864400156
Scopus Id 2-s2.0-85070214092
DOI 10.1109/ACCESS.2019.2925049
Abstract This paper presents an automation strategy for multi-terminal HVDC (MT-HVDC) systems combining a dc optimal power flow (dc OPF) routine and a unified reference controller (URC). In the presented automatic framework, the dc OPF algorithm is implemented at the power dispatch center (PDC) of the MT-HVDC system to find optimal reference operation points of the power converters to minimize the losses during the operation of the MT-HVDC grid and solves the contradiction between minimizing losses and preventing commutation failure. At the local control systems, the operating points of the voltage-source converter (VSC) stations are tuned based on the calculations executed in the PDC, which enables fast response to power fluctuation and ensures a stable dc voltage. However, if the communication between the two control layers is lost, the MT-HVDC grid remains stable based on the pre-defined V-P droop characteristics for the power converter stations till the connection establishes again, and a set of new operating points is generated and sent. The static and dynamic simulations conducted on the CIGRE B4 HVDC test grid establish the efficient and effective grid control performance with the proposed automation strategy. The analysis shows that the proposed control scheme achieves the desired minimum losses while, at the same time, satisfying the system constraints.
Keywords CIGRE B4 HVDC test system; DC optimal power flow; multi-terminal HVDC systems (MT-HVDC); power dispatch center (PDC); unified control strategy
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