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The impact of static generators on power system small signal stability is evaluated by means of micro-synchrophasors collected in a distribution system using a class A Power Quality recorder that also functions as a Phasor Measurement Unit. Distributed generation of renewable energy could be a possible concern to the traditional power system where inertia of rotating generators is available during...
Oscillations are inherent to power systems and the analysis of such phenomena is a fundamental issue for understanding the dynamical behavior of power networks. Knowledge of the system natural frequencies and its associated damping ratio, is useful information for understanding the system performance after being subjected to a disturbance. Topological changes in the transmission network of electrical...
This paper presents an online distributed control design for suppressing inter-area oscillations in large power systems under structural constraints posed on the underlying communication network. The presence of multiple clusters of generators in a power system results in several inter-area oscillation modes. By modal analysis, we first show that the contribution of each inter-area mode on the electromechanical...
Poorly damped low frequency oscillations in power systems have led to system blackouts in the past. Power system stabilizers (PSSs) are installed to improve synchronous generator's oscillation damping capabilities. PSS parameter tuning by various traditional and new optimization methods are studied to ensure stable and secure operation of interconnected power systems with uncertainties. It is imperative...
As more renewable energy resources connected by power electronics and gas-fueled generators are integrated into power grids, total system inertia has been significantly decreasing in recent years. The resulting decline in system primary frequency response threatens the reliability and stability of power grids. This paper aims to study the locational dependence of the impacts of inertia on system primary...
In this paper fundamental investigations concerning the influence of load modeling on small signal stability investigations of power systems are presented. For this purpose the effect of different voltage- and frequency-dependent static load models on oscillation damping and frequency was examined by means of a single-machine infinite-bus system. Frequency domain calculations as well as time domain...
This paper presents modeling and analysis of electrical oscillations in a wind farm system. The detailed modeling and modal analysis of a wind farm system are presented in this paper. The approach to modeling uses detailed representation of a wind turbine generator and collection system including high voltage direct-current (HVDC) power converter system control, facilitating a comprehensive analysis...
Inter-area oscillations are inherent to power systems. This type of oscillations is characterized by a group of generators in one are of the system oscillating against other group located in another area. Since power systems are subjected to a wide range of disturbances, the damping associated with those oscillations may be drastically modified and the system security may be compromised. Thus, identifying...
Inter-area oscillations impact negatively on power system stability and power transfer capability. Monitoring oscillations in real time can improve control of the power system. Synchrophasor data from Phasor Measurement Units (PMU) provide new options for oscillation monitoring. In this study, an oscillation monitoring method using synchrophasor data from PMUs is presented. The method is verified...
Power systems are shifting toward utilizing higher penetration of renewable energy sources (RESs) and especially wind generation because of the need to reduce carbon emissions over the next several decades. Small signal stability can be influenced with increasing penetration of wind generation in power systems. Poor damping of low frequency electromechanical oscillations are a threat to secure operation...
Offshore vessels and ships are islanded power systems. Maintaining the operation during the adverse system operating conditions is a challenge. This paper reviews the concepts to improve the protection and operation using the advanced system protection and new developments of the simulating process.
In this paper, a new approach for recognizing coherent groups of generators based on the correlation characteristics of generator rotor angle oscillation is proposed. In this approach, by online measuring generators rotor angle oscillations, the correlation coefficients between all pairs of generators are evaluated. Based on the evaluated correlation coefficients, coherent groups of generators are...
The purpose of this paper is to analyze the small signal stability of the Uruguayan power system on a short to medium term according to the scenarios for the years 2013–2017, in which the transmission network will undergo major changes: first, the inclusion of large quantities of wind power and secondly, the implementation of major infrastructure projects including the construction of the 500kV line...
Identification of suitable signals in a power system for monitoring critical inter-area modes is a very important issue when using wide area measurement systems (WAMS). This paper reports on the application of modal analysis to identify the critical inter-area modes in the Mexican system and to determine a set of appropriate signals of the system for extracting both the frequency and damping associated...
This paper presents collected events to demonstrate the use of synchrophasor data to update and improve system models and system operation. Examples are given of responses to events captured using wide-area synchrophasor measurements. Phase angle, frequency, and voltage responses are displayed with discussion of the events, synchrophasor data views, and insights to be gained from the different data...
Applications of single Flywheel Energy Storage System (FESS) to suppress power system multi-mode oscillations is presented in the paper. Based on independent active power and reactive power control loops and damping torque analysis, the feasibility of damping power system multi-mode oscillations using single FESS is studied. Based on modal analysis, the effective control loops are determined to install...
This paper presents a decentralized control scheme for two types of FACTS devices: SVC and TCSC, to enhance the voltage and angular stability in a power system using the residue method. In the first place, the system is analyzed, knowing the main stability problems. Then, the system is linearized to know which the controllable and observable modes are. Then, another analysis is made to know the better...
The Uruguayan electric power system is facing deep challenges in the near future. The plans for 2015 include a significant expansion of generation based on renewable sources (wind, biomass) and a new HVDC international interconnection. These plans and the opening to multiple, distributed private generators pose significant challenges to the system operation and planning. This work describes the modal...
ModeMeter techniques for real-time small-signal stability monitoring continue to mature, and more and more phasor measurements are available in power systems. It has come to the stage to bring modal information into real-time power system operation. This paper proposes to establish a procedure for Modal Analysis for Grid Operations (MANGO). Complementary to PSS and other traditional modulation-based...
This paper presents an analysis of interarea and intra-area oscillation modes using a detailed computer model of the Southeastern part of the UCTE Interconnection. Modal analysis, as well as FFT, is used to identify modes. Cases of exact weak resonance, as well as near strong resonance are discussed. The oscillation problems caused by a weak connection of the Hellenic System to a small part of European...
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