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Power systems are nonlinear dynamic systems, in which the chaotic modes occurrence is possible. Chaotic modes are potentially dangerous for the equipment, the system stability and survivability as a whole. We consider the possibility of timely chaotic modes detection of electric power systems due to the system parameters bifurcations. The research task and early detection of such modes are important...
In this paper, a Wide Area Control (WAC) scheme cooperates with Renewable Energy Sources (RESs) to achieve a robust power oscillation damping. The WAC signals are synthesized by a two-level hierarchical controller which utilizes global measurements from all the installed synchronous generators to maximize the performance of the generators' local controllers. In the proposed WAC scheme, the dynamic...
The transient response of power grids to external disturbances influences their stable operation. This paper studies the effect of topology in linear time-invariant dynamics of different power grids. For a variety of objective functions, a unified framework based on H2 norm is presented to analyze the robustness to ambient fluctuations. Such objectives include loss reduction, weighted consensus of...
In this paper, the interaction between ac and dc grids is studied for two types of MMC control structures; conventional and non-conventional control structures. Linear analysis methods that are based mode shapes and participation factors are used to identify dynamic interaction in a hybrid ac-dc power system. The analysis uses as a test system a three terminal Modular Multilevel Converter (MMC) based...
Electromagnetic transient studies of large scale power system including FACTS and HVDC requires modeling of complicated transmission networks, at the same time modeling the details of complete system requires great amount of computer memory and computation time. The complete Indian power system network of northern, eastern, western, north-eastern and southern region consists of more than 1200 buses...
Results of a nonlinear simulation is used in this paper to identify a linear model of a black-boxed synchronous machine. Linear system identification methods such as Prony Analysis, are employed to identify linear models of power system devices when their complete mathematical models are not available to be included in small signal stability studies. While the user lacks the knowledge of the control...
This paper focuses on the assessment of power systems dynamic stability, considering the example of the Blackout that occurred in Tunisia in 2014. The fault that caused the blackout is a short circuit that occurred on 31 August 2014. This work is a simulation of this fault using PSS/E Program with an assessment of the dynamic stability of the Tunisian power system. The work also addresses the importance...
Wide deployment of sensing and actuation capabilities in the electric power grid, along with changing dynamical characteristics, are necessitating analysis of power-system swing dynamics from an input-output perspective. In this article, the input-output properties of the swing dynamics, including the finite and infinite zeros, are characterized from a dynamical-networks perspective. Specifically,...
Power systems are experiencing a historical transformation in their paradigm and architecture. As such, the classical methods ensuring secure operation of power grids, which are largely developed several decades ago, need to be reassessed. At the same time, new generations of smart electronic devices provide fast actuation to smart power grids. Also, transmission resources are continuously installed...
This paper studies the effects of secondary contingency (N-1-1) on stability of power system in long time duration transient state considering state probability. The Vietnam power system which includes all level voltages up to 500 kV is utilized. The only 500 kV level system is analyzed by N-1-1 contingency criterion to define vulnerabilities of power grid. The dynamic simulation is implemented in...
With the scale of small and medium hydropower increasing gradually, it is difficult to establish a detailed model because the parameters of each generating unit can barely be obtained. To build a dynamic equivalent model of the hydropower generator group, this paper presents an estimation-based equivalent method, which will keep the dynamic responses and the transient stability consistent before and...
The development of high-performance computing techniques and platforms has provided many opportunities for real-time or even faster-than-real-time implementation of power system simulations. One approach uses the Parareal in time framework. The Parareal algorithm has shown promising theoretical simulation speedups by temporal decomposing a simulation run into a coarse simulation on the entire simulation...
This paper presents comparative study of reduced order models (ROMs) of a doubly fed induction generators (DFIG) for normal operation. A DFIG with detailed mechanical, electrical and control components is the basis for model development. Two control strategies, the maximum power point tracking and set point tracking, are considered for normal operation. In these cases, the dynamic model of DFIG can...
Disturbances as generation trips, load shedding or other switching events propagate measurably throughout power systems as electromechanical interactions and may cause undesirable phenomena as power oscillations. Therefore, it is essential to have a deeper understanding of the electromechanical phenomenon to improve current countermeasures. For this reason, the present study analyzes the impacts on...
This paper investigates the applicability of numeric Wazwaz El Sayed modified Adomian Decomposition Method (WES-ADM) for time domain simulation of power systems. WES-ADM is a numerical method based on a modified Adomian decomposition (ADM) technique. WES-ADM is a numerical approximation method for the solution of nonlinear ordinary differential equations. The non-linear terms in the differential equations...
The Power System Toolbox (PST) is a MATLAB-based package for simulating power system electromechanical dynamics. In this paper, we report on code that we developed to augment the capabilities of the PST, which enables the possibility of including the automatic generation control (AGC) system in simulations. In the process, we have also modified the linearization capability of the PST so as to include...
Wind power plants installation in the electrical power networks has been growing through the last years and a larger penetration is expected in the near future. Because of this, wind farm technologies will influence the power system behavior modifying its dynamics by reducing power systems global inertia. Hence, there is an increased interest and need to study the wind turbine farms behavior and their...
Methods to modify power system dynamics through the addition of synthetic inertia have gained increasing research attention over the past several years. Many researchers justify this focus by implicitly assuming that adding inertia increases a system's stability, and only focusing on the frequency nadir as a measure of performance. In this paper, we draw attention to the fact that adding synthetic...
In this paper, three different Wide-Area Damping Control design methods are considered for a two-level control scheme. The important challenges involved in this control design are output-feedback, communication time-delays, loss of remote signals and multivariable control design. Three different control design methods, found in the literature, are analyzed: Riccati equation solution, Linear Matrix...
Using the pseudo-generalized Hamiltonian method, this paper investigates the decentralized nonlinear robust coordinated control of multiple static synchronous compensators (STATCOMs) in multi-machine multiload power systems. First, the uncertain nonlinear differential algebraic equation model is constructed for the power system. Then, the dissipative pseudo-generalized Hamiltonian realization of the...
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