Distributed Controllers for Multi-Terminal HVDC Transmission Systems
(English)In: IEEE Transactions on Control of Network Systems, ISSN 2325-5870Article in journal (Refereed) Accepted
High-voltage direct current (HVDC) is a commonly used technology for long-distance electric power transmission, mainly due to its low resistive losses. In this paper the voltagedroop method (VDM) is reviewed, and three novel distributed controllers for multi-terminal HVDC (MTDC) transmission systems are proposed. Sufficient conditions for when the proposed controllers render the closed-loop system asymptotically stable are provided. These conditions give insight into suitable controller architecture, e.g., that the communication graph should be identical with the graph of the MTDC system, including edge weights. Provided that the closed-loop systems are asymptotically stable, it is shown that the voltages asymptotically converge to within predefined bounds. Furthermore, a quadratic cost of the injected currents is asymptotically minimized. The proposed controllers are evaluated on a four-bus MTDC system.
Research subject Electrical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-164311OAI: oai:DiVA.org:kth-164311DiVA: diva2:805451
FunderSwedish Research CouncilKnut and Alice Wallenberg Foundation
QP 2015092015-04-152015-04-152015-09-15Bibliographically approved