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The rotor angle stability of generator is basic to hydro turbine generating sets (HTGS) and power systems stabilization. Firstly, an approximate design method is proposed to solve the difficulty in application for Hamiltonian damping injection method. Secondly, the Hamiltonian model of HTGS is built by connecting Hamiltonian model of nonlinear hydro turbine and generator. Adding the relative factors...
In this paper, conventional lead-lag power system stabilizer (CPSS) is designed to damp electromechanical oscillations. CPSS parameters settings are computed using linear control theory. A new technique based on particle swarm optimization PSO is proposed to optimize the parameters settings of CPSS. The problem is formulated as an optimization problem, the objective is to compute the optimal parameters...
A power oscillation damping controller for fully rated converter wind turbines was investigated. Small signal analysis and time domain simulations were used to investigate the performance of the fully rated converter wind turbine with a power oscillation damping controller when connected to a single bus representation of the large power system. A power oscillation damping controller for fully rated...
In this paper, the application of Interline Power Flow Controller (IPFC) in damping of low frequency oscillations is investigated. An extended Heffron-Phillips model of a single machine infinite bus (SMIB) system is used to analyze the damping torque contribution of the IPFC in power systems. The potential of various IPFC control signals upon the power system oscillation stability is investigated...
In this paper a simplified analysis of the effect of a Thyristeor Controlled Phase Shifter (TCPS) on the stability of a Single machine infinite bus (SMIB) system is presented. The TCPS which is located at the terminal of generator has the PID controller in which the coefficients of PID is optimized by chaos and PSO algorithms in order to damp the Low Frequency Oscillations (LFO). From the first, for...
This paper presents the results obtained from a PSCAD/EMTDC dynamic fault simulation of a grid connected Doubly-fed Induction Generator (DFIG). The transient stability performance of the DFIG is investigated; case studies which demonstrate the possibility of wind turbine generator torsional vibration, and the concept of Critical Clearing Time (CCT) for the DFIG are presented and the results are compared...
Several industrial-grade power system simulation tools are commercially available in the market. They are expensive to acquire and time-consuming to learn. As a result, very few institutions (utilities, academic/research organizations) can afford to use more than one power system simulation tool. The simulation tools differ in their components modelling. Different simulation tools can give different...
This paper presents the results of a small-signal stability study conducted on a large power system. The tools and techniques applied have been reported in previous work. The novelty of this paper and study is that these tools and techniques are being applied here to a system that is at least an order of magnitude larger than the systems previously studied. As a result this study presents an interesting...
This paper focuses on the super/sub-synchronous operation of the doubly fed induction generator (DFIG) system. The impact of a damping controller on the different modes of operation for the DFIG based wind generation system is investigated. The co-ordinated tuning of the damping controller to enhance the damping of the oscillatory modes using bacteria foraging (BF) technique is presented. The results...
A detailed dynamic model of wind driven doubly fed induction generator system has been developed. The various converter controls have been identified and their order in enhancing the dynamic performance has been established through Hankel singularity value indices and also residue evaluations. Damping controller structure and most effective input to the controller have been determined using the controllability...
The authors have studied the effect of the quadrature axis transient reactance of large cylindrical synchronous machine on operation. Using the measured data, the authors studied the effect on the transient and stability phenomena by the finite element method (FEM) and the electromagnetic transients program (ATP-EMTP).
Wind turbines are complex, nonlinear, dynamic systems forced by aerodynamic, gravitational, centrifugal, and gyroscopic loads. The aerodynamics of wind turbines is nonlinear, unsteady, and complex. Turbine rotors are subjected to a complicated three-dimensional (3D) turbulent wind inflow field with imbedded coherent vortices that drive fatigue loads and reduce lifetime. Design of control algorithms...
The subject of this paper is the extension of QSS modeling to include low frequency interarea oscillations in power system long-term dynamics. All other electromechanical oscillations, such as local or intra-area are replaced by equilibrium (algebraic) equations. Modal analysis and simulations are made on a classical test system of 11 buses and 4 generators. The effect of solver parameters and generator...
For dynamic stability studies, the supply of synchronous generators' characteristic data is frequently requested. Most of these values, such as reactances, time constants and moment of inertia, are obtained by the electromagnetic design calculations. Others, such as the damping coefficient of the synchronous machine, are calculated more or less straight-forwardly for conventional damper configurations...
Sub-synchronous resonance (SSR) oscillations in long transmission line brings to failure of the turbine shaft. Static compensator (STATCOM) is a multifunctional FACTS device which its ability depend on its location on transmission line. In this paper, a controller is proposed and designed for STATCOM in transformer bus to damping SSR in all operation points. The controller is designed based on speed...
This paper presents a case study for demonstrating the capability of static phase shifter (SPS) in enhancing the damping of the inter-area oscillations in a multi-machine power system. In this context, investigations are conducted on a three-area test system. The local and inter-area modes of such a system are identified using eigenvalue analysis and a supplementary control for the SPS is proposed...
In this paper a study about the different effects of static and dynamic rotor eccentricities on the external electric variables of a brushless salient-pole synchronous generator (SG) is presented. Air-gap irreularities and related monitoring techniques for synchronous machines have been studied in the past mainly about large vertical hydro-generators [1], but similar issues have been recently recognized...
This paper investigates the torsional levels of the doubly-fed induction generator (DFIG) and the fixed speed induction generator (FSIG) initiated by network faults. The inclusion of the turbine-generator mutual damping is investigated for the DFIG, and FSIG. For the DFIG the significance of a detailed representation of the grid-side input filter and the DC-link capacitor are studied. A method is...
This paper addresses effects of automatic excitation control in time-stepped finite element analysis of hydroelectric generators. A simple method to incorporate exciter and automatic voltage regulator models in a finite element software is presented and tested on a small hydropower generator connected to a three-phase power system equivalent. Three simulations are performed to demonstrate the impact...
Load characteristics are known to have an effect on the performance of a Power system stabilizer (PSS) while damping inter-area oscillation. In this paper, conventional and wide area control system (WACS) based PSS designs are comparatively assessed. The conventional PSS utilizes local rotor speed as its input whereas the WACS-based PSS can use both local and remote generator rotor speeds. From existing...
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