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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...
The paper considers the principle of stabilization for the rotation speed with the use of a magnetic CVT in the form of a magnetic gearbox providing the required reduction coefficient. The paper is devoted to investigations of transients in a autonomous power system consisting of wind turbines with synchronous generators with permanent magnets under sudden change wind speed. The investigation involves...
While many advantages can be offered by DC-based integrated power system, it is a challenging task to continuously maintain optimal performance with a dynamic load profile. Coordination between the real-time controllers and system optimizer is not a trivial task in such conditions. Some of the protection schemes provide fault detection and isolation functions, but do not consider system level optimization...
This paper addresses the modeling and controller design of large scale dc microgrids with nonlinear loads. First, the dynamic models of the sources and loads are discussed in detail, placing particular emphasis on generators with passive rectification and Constant Power Loads (CPLs) with input filters. These models will be defined as source and load nodes which along with internal nodes, will be integrated...
Proposed here is a Fault Tolerant Control (FTC) design for nonlinear power systems with unknown actuator failures. The method is based on the efficient multi input-multi-output linearization technique. The power system considered here is consisted of two generators along with a load and an infinite bus via a transmission network. First, the derivatives of the system's output is calculated repeatedly,...
In this paper groups of coherent generators are identified based on a correlation metric. The main contribution is related to the rapid, simple, and reliable identification of coherent generators, which may be aggregated in order to constitute equivalent generators, thus reducing the dimensionality of the original model. Different levels of aggregation may be attained and results demonstrate the proposal's...
Matter et al. derive a real-valued master stability function which determines whether and to what degree a given power grid is asymptotically stable. They base their work on an abstract grid having synchronous generators in presumed steady state equilibrium. They make some assumptions about the electrical and mechanical properties of these generators, then derive their stability function from the...
The aim of this work is to evaluate the impact of the incorporation of dynamic voltage support and reactive power injection requirements in PV systems connected at Provincial Interconnected System(PIS) of San Juan-Argentina projected up to the year 2024 under different levels of penetration. To this aim, the calculation of a severity indexes is proposed. It can be concluded that the capacity to withstand...
Future shipboard power system architectures are designed to service high-power pulsed loads through a combination of generators and energy storage for volume and weight considerations. Optimal control solutions therefore depend on both past and future events. This complicates evaluation of the relative performance of different architectures due to dependence on controller strategies and algorithms...
Since isolated microgrids, such as all-electric ships (AES), have limited generation and finite inertia, frequency and voltage violations are prone to happen in these microgrids. Therefore, it is necessary to have a power management framework for optimal scheduling of microgrids while achieving stable real-time operation. This paper introduces a novel multi-objective security constrained power management...
This paper presents chaotic bat algorithm to solve dynamic economic dispatch (DED) problem. Various load in 4 hours considering to solve the DED problem which focused on minimizing the total cost of generation power in each hour. To demonstrate the effectiveness of the proposed method, the DED problem performed on 150 kV Mahakam power system on East Kalimantan and compared with bat algorithm and particle...
Network reduction methods are essential and useful means today for analyzing large, complex power systems with much ease. It is desired that the reduced network represent the original network as closely as possible. Several methods are available in the literature for the reduction purpose. Zhukov’s method of network reduction is well-suited to large system reduction where identity of pertinent...
STATCOMs provide grid with not only reactive power compensation but auxiliary stability support through exerting influence on the dynamic behavior of Synchronous Generator (SG) during grid power oscillations. In this paper, method of electrical torque analysis is utilized to analyze the mechanism of STATCOM affecting the transient performance of SG when operates in power oscillations suppression mode,...
An assessment of the dynamic interactions between generators will provide valuable information which could improve control action and hence maintain stability in the interconnected system. The paper presents the study on dynamic interaction in terms of coherency established among the generators following a particular event. Time Frequency Coherency (TFC) method is applied to trace the coherency among...
This paper evaluates the dynamic behaviour of a system with different scenarios of generation and loads considering renewable distributed generation. The impact on protection subsystems and islanding detection is assessed in time-domain disturbance simulations that lead to islanding situations. Specifically, the simulations will be dedicated to model the dynamic behaviour of the system with Wind Power...
This paper presents a novel approach, which identifies a buffer zone around a given study system and replaces the external system with an equivalent. The aim is to obtain a reduced system, which is suitable for assessment of long-term voltage and frequency dynamics in the study system. First, the proposed methodology ensures that all components, which are impacting the voltage profile of the study...
This paper presents spectral-based dynamic approach for mode shape estimation by using time-domain signals. The approach in this paper is applied on software simulated signals which partially resembles the PMU signals. Power System Toolbox (PST) is used to simulate IEEE 16 machine 68 bus test system to generate multiple signals. Empirical mode decomposition (EMD) decompose multimode signal into separate...
The approach of programmed trajectory motion control (PTMC) is proposed for stabilization of synchronous generators after short-circuit faults followed by islanding and for further synchronization of islanded system with the main grid. This approach is especially useful for small size synchronous machines connected to distribution grid. Integrated solution of both stabilization and synchronization...
In this paper an Intentional Controlled Islanding (ICI) scheme is investigated as a last resort corrective action, to prevent an imminent blackout. The proposed methodology for ICI is based on simulated real-time measurements from Phasor Measurement Units (PMUs) which are used for online identification of power system dynamic behavior. The methodology aims to split the system into two islands based...
This paper presents the implementation of the Nordic test system in DIgSILENT PowerFactory. The implemented system is a variant of the Nordic32 network and is based on the technical report “Test Systems for Voltage Stability Analysis and Security Assessment” prepared by the IEEE Power System Dynamic Performance Committee, the Power System Stability Subcommittee, and the Test Systems for Voltage Stability...
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