Controller structure and design of firing angle controllers for (unit connected) HVDC systems

Rae, T. A., Boje, E., Jennings, G. D., Harley, R. G., & Wishart, Michael T. (1996) Controller structure and design of firing angle controllers for (unit connected) HVDC systems. In Proceedings of 1996 IEEE AFRICON 4th AFRICON Conference in Africa, IEEE, University of Stellenbosch, South Africa.

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This paper investigates the control of a HVDC link, fed from an AC source through a controlled rectifier and feeding an AC line through a controlled inverter. The overall objective is to maintain maximum possible link voltage at the inverter while regulating the link current. In this paper the practical feedback design issues are investigated with a view of obtaining simple, robust designs that are easy to evaluate for safety and operability. The investigations are applicable to back-to-back links used for frequency decoupling and to long DC lines. The design issues discussed include: (i) a review of overall system dynamics to establish the time scale of different feedback loops and to highlight feedback design issues; (ii) the concept of using the inverter firing angle control to regulate link current when the rectifier firing angle controller saturates; and (iii) the design issues for the individual controllers including robust design for varying line conditions and the trade-off between controller complexity and the reduction of nonlinearity and disturbance effects

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ID Code: 37930
Item Type: Conference Paper
Refereed: Yes
Keywords: HVDC power transmission, control system synthesis, controllers, electric current control, feedback, invertors, power system control, rectifiers, AC source, HVDC link, HVDC systems, back-to-back links, controlled inverter, controlled rectifier, controller complexity, controller structure, disturbance effects reduction, feedback design issues, firing angle controllers, frequency decoupling, inverter firing angle control, link current regulation, nonlinearity reduction, operability, robust design, safety
DOI: 10.1109/AFRCON.1996.563005
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Power and Energy Systems Engineering (excl. Renewable Power) (090607)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 1996 IEEE
Deposited On: 14 Oct 2010 00:02
Last Modified: 22 Jun 2017 14:42

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