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This paper presents a novel controller for damping unstable torsional oscillations caused by Subsynchronous Resonance (SSR) phenomenon. The controller is based on the delayed feedback control theory. The first system of the IEEE Second Benchmark Model is used to evaluate the effectiveness of the controller which uses the synchronous generator rotor angular speed as the sole input signal. The output...
The recently proposed power-synchronization control for grid-connected voltage-source converters (VSCs) has been shown to be a feasible solution for high-voltage dc (HVDC) transmission connected to high-impedance weak ac systems. In this paper, power-synchronization control is investigated for VSC-HVDC connected to another type of weak ac system, i.e., low-inertia or island systems. As an example,...
This paper first presents the Hopf bifurcation analysis for a vector-controlled doubly fed induction generator (DFIG) which is widely used in wind power conversion systems. Using three-phase back-to-back pulse-width-modulated (PWM) converters, DFIG can keep stator frequency constant under variable rotor speed and provide independent control of active and reactive power output. The oscillatory instability...
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