Dynamic Stability Enhancement of a DC-Segmented AC Power System Via HVDC Operating-Point Adjustment


Hopf bifurcation phenomenon of a Power System results in oscillatory dynamics which will cause instabilities within the system. Thus, it is desirable to work the system such that a sufficient margin to Hopf bifurcation is ensured. This paper presents a strategy based mostly on the adjustment of the setpoint values of the HVDC link controllers, to stop instability or increase the steadiness margin of the system subject to Hopf bifurcation. In this paper, the first-order sensitivities of the Hopf stability margin to the setpoint values of the HVDC links are presented. These sensitivities identify the optimum direction to alter the HVDC setpoints to steer the system removed from instability, increase the stability margin, and improve the damping of oscillatory modes. The proposed method is evaluated on varied system configurations subject to Hopf bifurcation phenomena caused by a variety of events, like load and line impedance variations. Simulation results show that at the optimum operating purpose, for a selection of Hopf bifurcations, the soundness margin and damping of the oscillatory modes improve.

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