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Small signal stability enhancement in power systems is often accomplished using supplementary controls. The usual technique is to utilize a power system stabilizer to generate a control signal that is applied to the excitation of a large synchronous generator. In this paper, a different approach is taken: a control signal is obtained using estimated signals from a ‘dynamic state estimator’, and the...
This work investigates the impact of increased penetration of doubly fed induction generators (DFIGs) on electromechanical modes of oscillations of a large interconnected power system. The work proposes a control mechanism aimed at designing the power system stabilizer (PSS) for a DFIG similar to the PSS of synchronous machines. The wind generator power output is taken as input to the PSS. The active...
This paper deals with designing of Power System Stabilizer (PSS) based on Imperialist Competitive Algorithm (ICA) to improve the stability of power system. The proposed algorithm has been applied on a Single Machine Infinite Bus (SMIB) system where the coefficients of PSS controller has been optimized by ICA. The system with proposed controller has been simulated for the special disturbance in input...
This paper proposes a new control design scheme for doubly fed induction generator (DFIG) based wind generation systems to damp interarea oscillations of power systems. The control system of DFIG consists of two parts. The first part is the primary power and voltage (PV) control. The second part is a supplementary damping controller (SDC) based on PV control, designed to enhance damping of interarea...
This paper presents the application of fuzzy logic based supplementary controller, for Interline Power Flow Controller (IPFC), to enhance the damping of low frequency oscillations in the Single Machine-Infinite Bus (SMIB) power system installed with IPFC. The fuzzy logic based IPFC controller using Mamdani type inference system is designed with generator speed and rotor angle as its input signals...
This paper addresses the problem of electromechanical wave propagation in power systems. To mitigate this type of disturbance, this paper proposes a remote control strategy that could be applied to power system stabilizers. This strategy is based on wide-area measurements, and exploits the disturbance propagation speed to introduce an extra damping torque simultaneously with the disturbance arrival...
FACTS devices might be successfully applied in power-system dynamics; however, appropriate control is a precondition for this. Some attempts were already made in searching of proper control strategies, but mainly according to local parameters and only for simple FACTS devices with only one controllable parameter. In this paper we present a control strategy for a GUPFC with multiple controllable parameters...
This paper presents a novel controller based on the delayed feedback control theory for stabilizing unstable torsional oscillations caused by subsynchronous resonance (SSR) in power systems. The first system of the IEEE second benchmark model which consists of a synchronous generator connected to an infinite busbar through two parallel transmission lines, one of which is equipped with a series capacitor,...
A systematic methodology for placement and integration of wide-area measurements in high-voltage direct current (HVDC) damping modulation is developed for large-scale AC/DC power system. A concept observed centre of inertia (OCOI) of power grid is described. For an interconnected AC/DC power network, the frequency difference between the OCOI of the sub-grids can be used as the input signal for HVDC...
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