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To improve the transient angle stability of an two- area interconnected ac/dc power system, robust controllers are suggested in this note both for excitation systems of generators and dc power modulation, based on the COI (center of inertia) dynamic information of the system. In the control strategy, the rotor angles and frequencies of all generators track the angle and frequency of the dynamic COI...
This paper presents assessments of two models for MOV protected series capacitors. The first model is empirical and the second is analytically developed by solving the nonlinear system and applying the describing function (DF). The models are assets in short-circuit and transient stability studies. For short-circuit analysis, symmetrical and unsymmetrical faults are considered on simplified circuits...
This paper focuses attention on the concept of flatness-based feedback linearization and its practical application to the design of an optimal transient controller for a synchronous machine. The feedback linearization scheme of interest requires the generation of a flat output from which the feedback control law can easily be designed. Thus the computation of the flat output for reduced order model...
This paper presents a hardware test system developed at Florida International University capable of performing the operation of modern power system infrastructure. The purpose of this system is for research and educational applications. We will describe the design and construction of this test system as well as its implementation to simulate distributed control scheme. Some important elements of the...
This paper addresses a fast process for performing transient stability studies in a large transmission system. The paper describes how the most severe three-phase fault locations were identified in Entergy's power system network. The approach described in this paper offers a unique capability to automatically identify the most severe fault locations and perform ranking of these most severe faults...
As the penetration level of the distributed generations on distribution network will increase, they must take their share of responsibility in the system security and provide flexibility and controllability necessary to support secure system operation. However, following the occurrence of large disturbances on the network (short-circuits, line outage, voltage dips...) the protective disconnection...
Optimal locations and design of robust multimachine power system stabilizers (PSSs) using heuristic algorithms is presented in this paper. The tuning of PSS via a non-dominated sorting genetic algorithm (NSGA-II) is performed to obtain a set of compromise speed-damping solutions. The stabilizers are tuned to simultaneously shift the lightly damped and undamped electromechanical modes of all plants...
The POD signals implemented in the existing thyristor controlled series compensators (TCSCs) of the Brazilian north-south (NS) interconnection are solely intended to damp the low-frequency NS oscillation mode. These signals are derived from the modulus of the active power flow in the NS line that is phase-lagged at the frequency of the NS mode and experience relatively large excursions following exogenous...
This paper proposes a new method for transient stability analysis in terms of measuring critical clearing time using grid-computing technology. Grid computing is a highly developed system for jointly solving collaborative complex problems; those are required to solve in limited time and therefore they need high performance computing. Probabilistic transient stability analysis is one such application,...
Electrical phenomena in power systems tend to exhibit higher nonlinearity, because more efficient operation accompanies severer power transfer. In such situations, there might exist some limitation to the use of conventional linear control design scheme due to the nonlinearity of power systems. As for consideration of the nonlinearity, we have developed a nonlinear stability analysis method based...
Operation of variable speed wind turbine generator (WTG) in the above-rated region characterized by high turbulence intensities demands a trade-off between two performance metrics: maximization of energy harvested from the wind and minimization of damage caused by mechanical fatigue. This paper presents a learning adaptive controller for output power leveling and decrementing cyclic loads on the drive...
The accuracy of the load parameters has great effects on the validity of power system simulation. Based on PMU/WAMS, considering the requirements of online simulation, prediction and control, this paper systematically proposes an approach for fast online identification of the dominant parameters of composite load. The approach includes four parts, i.e., the dominance analysis of parameters, the transformation...
A new approach which is fast and accurate for including the transient stability constraints in the optimal power flow is presented. The context is that of applications in economic dispatch with dynamic security constraints. The method draws on the sensitivity analysis of maximum relative rotor angles with respect to generator active-powers. The analysis is based on perturbations of the active-powers...
In this paper, a nonlinear feedback excitation control is presented for power systems with uncertainties. In order to achieve the transient stability enhancement, the control law can be designed based on the adaptive backstepping method by a recursive way without linearization. Lyapunov function method is applied to analysis the convergence of the power angle and relative speed of the generator and...
This panel paper addresses applications of intelligent techniques on flexible AC transmission system (FACTS) devices in terms of steady state and transient improvement of power systems. Taking advantages of the FACTS devices depends greatly on how these devices are placed in the power system, namely on their location and size. In a practical power system, allocation of the devices depends on a comprehensive...
In this paper the model and control scheme of a doubly-fed induction generator (DFIG) is presented. The controllers are designed in order to take into account the different operating conditions of the generator. In normal operations the DFIG can work with variable rotor angular speed between a minimum and a maximum value, covering a wide range from subsynchronous to supersynchronous angular speeds...
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