Optimal coordinated control of multiple HVDC links for power oscillation damping based on model identification (pages 188–205)

摘要

This paper deals with optimal coordinated control of several high voltage direct current (HVDC) links basednon an estimated model of large power systems. The model of the power system is estimated by usingnsubspace system identification techniques. An optimal controller is designed based on the estimated modelnwith the aim to improve the damping in the system. The main contribution of this paper is the development ofna new method which uses global Phasor measurement units (PMUs) signals for coordinated damping controlnof multiple HVDC links. The input signals are the controllable set-points of the HVDC links, the outputnsignals are the speed signals of selected generators obtained from PMU. The PMU signals are used tonestimate the current state of the model, i.e., the state of the system, an appropriate control action can then benapplied to dampen the system. The benefit of the method is that the used output signals, i.e., the used PMUnsignals, are independent of the system equilibrium and therefore makes it possible to use state-feedbackncontrol, i.e., coordinated control. The method is applied to the Cigre′ Nordic 32-bus system including twonHVDC links. The consistent results show that the damping can be significantly increased. Copyright#2010nJohn Wiley & Sons, Ltd.