Optimal coordinated control of multiple HVDC links for power oscillation damping based on model identification
2012 (English)In: European transactions on electrical power, ISSN 1430-144X, E-ISSN 1546-3109, Vol. 22, no 2, 188-205 p.Article in journal (Refereed) Published
This paper deals with optimal coordinated control of several high voltage direct current (HVDC) links based on an estimated model of large power systems. The model of the power system is estimated by using subspace system identification techniques. An optimal controller is designed based on the estimated model with the aim to improve the damping in the system. The main contribution of this paper is the development of a new method which uses global Phasor measurement units (PMUs) signals for coordinated damping control of multiple HVDC links. The input signals are the controllable set-points of the HVDC links, the output signals are the speed signals of selected generators obtained from PMU. The PMU signals are used to estimate the current state of the model, i.e., the state of the system, an appropriate control action can then be applied to dampen the system. The benefit of the method is that the used output signals, i.e., the used PMU signals, are independent of the system equilibrium and therefore makes it possible to use state-feedback control, i.e., coordinated control. The method is applied to the Cigre Nordic 32-bus system including two HVDC links. The consistent results show that the damping can be significantly increased.
Place, publisher, year, edition, pages
2012. Vol. 22, no 2, 188-205 p.
HVDC, inter-area oscillations, modal analysis, N4SID, Nordic 32-bus system, PMU, optimal control, small signal analysis, subspace system identification, WAMS
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-30624DOI: 10.1002/etep.554ISI: 000302015200006ScopusID: 2-s2.0-84859025613OAI: oai:DiVA.org:kth-30624DiVA: diva2:401159
QC 201205032011-03-012011-03-012013-04-16Bibliographically approved