Title Power Flow Control in Multi-Terminal HVDC Grids Using a Serial-Parallel DC Power Flow Controller
Authors ROUZBEHI, KUMARS, Yazdi, Seyed Saeid Heidary, Moghadam, Negin Shariati, ROUZBEHI, KUMARS
External publication No
Means IEEE Access
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
JCR Impact 4.09800
Area International
Web https://www.scopus.com/inward/record.uri?eid=2-s2.0-85053610038&doi=10.1109%2fACCESS.2018.2870943&partnerID=40&md5=72f3f2e2233551181d07b8dde6b09391
Publication date 01/01/2018
ISI 000448314400001
Scopus Id 2-s2.0-85053610038
DOI 10.1109/ACCESS.2018.2870943
Abstract Multi-terminal HVDC (MT-HVDC) grids have no capability of power flow control in a self-sufficient manner. To address this important issue, utilization of dc-dc high power and high-voltage converters is motivated. However, proposing suitable partial-rated dc-dc converters as well as their suitable modeling and control in both primary and secondary control layers as well as the stability analysis are the existing challenges that should be alleviated beforehand. This paper addresses the control of power flow problem through the application of a power converter with a different connection configuration, namely, serial parallel dc power flow controller (SPDC-PFC). The SPDC-PFC input is the transmission line voltage, and its output is transmission line current. Therefore, employing a full-power dc-dc converter is avoided as a merit. Additionally, in this paper, the common two-layer MT-HVDC grid control framework comprised of primary and secondary layers is efficiently modified in order to integrate the SPDC-PFC. A differential direct voltage versus active power droop control scheme is applied to the SPDC-PFC at the local control layer, guaranteeing dynamic stability, while an extended dc power-flow routine-integrating the SPDC-PFC-is developed at the secondary control layer to ensure the static stability of the entire MT-HVDC grid. The proposed control framework enables the SPDC-PFC to regulate the flow of current/power in the envisioned HVDC transmission line. From the static and dynamic simulation results conducted on the test CIGRE B4 MT-HVDC grid, successful operation of the proposed SPDC-PFC and control solutions are demonstrated by considering power flow control action. In more detail, the SPDC-PFC successfully regulates the compensated lines' power to the desired reference both in static and dynamic simulations by introducing suitable compensation voltages. In addition, good dynamic performance under both SPDC-PFC power reference and wind power-infeed change is observed.
Keywords Control of power flow; hierarchical control framework; serial-parallel dc power flow controller (SPDC-PFC); MT-HVDC grids; voltage source converter
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