The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper addresses the question of modelling voltage source terms when applying Agrawal's Field-to-transmission Line model in a numerical procedure involving a 3D full wave solver and Multiconductor Transmission-line Network solver based on the BLT equation. It particularly stresses the fact that the prima facie model consisting in integrating voltage sources along cells larger than usual criterion...
Renewable energy is the future of energy generation. As wind turbine is big part of this energy revolution, research of its impact to current electrical power grid is of paramount importance. Wind speed varies periodically and geographically. This variability of wind power generation needs to be compensated by the conventional generators. In doing so, the temperature of the generators increased in...
Recognizing that line-to-ground (L-G) faults are the most likely type of faults to occur, many industrial power systems are equipped with resistance grounded neutrals (NGR) to limit L-G fault currents. Limiting, identification and isolation of L-G fault currents prevents the progression of L-G faults into multiple phase faults with large fault currents and considerable damage to power systems. Under...
The Transmission Expansion Planning (TEP) is still a highly complex, combinatorial, non-linear and non-convex problem, where more accurate models and more efficient optimization tools are needed. The purpose of this work is to solve the static Transmission Expansion Planning (TEP) problem through the Biogeography Based Optimization (BBO) technique using an AC model, for the simultaneous expansion...
An accurate detection of spectrum opportunities is a key factor in governing the efficient spectrum usage in a cognitive radio (CR) system. Energy detection based spectrum sensing has been widely used due to its ease of implementation with lower computational complexity; however, its robustness and performance are highly affected by the noise uncertainty. In the present work, a real time hardware...
To meet the increasing electricity demand in the island of Indonesia, especially in areas that are lack access of electricity, it would be beneficial for these these islands to produce electricity using local potential renewable energy sources. In this study, Papua Province, the eastern region of Indonesia with 28 Districts, where 2,114 villages do not have electricity access was taken as the region...
In order to make better use of the existing transmission system, different approaches can be adopted. Previous research shows that both topology control and flexible AC transmission systems (FACTS) can enhance the transfer capability over the existing transmission network and reduce congestion costs. In previous studies, potential cost savings from performing line switching and utilizing FACTS control...
The increasing penetration of inverter based renewable generation (RG) in the form of solar photo-voltaic (PV) or wind has introduced numerous operational challenges and uncertainties. According to the standards [1], [2], these generators are made to trip offline if their operating requirements are not met. In an RG-rich system, this might alter the system dynamics and/or cause shifting of the equilibrium...
An ALQR (Adaptive Linear Quadratic Regulation) method for the variable speed wind turbines system is proposed in this paper. The controller is designed for the wind turbine operating in the low wind speed (Region 2), in which the pitch of the blades is fixed at the optimal angle. Since the wind turbine is a nonlinear system, the Kalman filter and the adaptive method are implemented in the controller...
Conventional approach of power system transient stability analysis use time-domain simulation and detailed system information. Recent efforts on non-uniform Kuramoto oscillators and basin stability have revealed new ways to address stability problems on power systems. In this paper, we introduce a method that can quantify how likely a generator remains synchronized after a disturbance. We show that...
This paper presents a fully-distributed DC optimal power flow (DCOPF) method that incorporates flexible transmission, and studies the impacts of communication limitations on the convergence properties of the proposed method. The distributed DCOPF algorithm iteratively solves the first order optimality conditions at each bus. To converge to the globally optimal solution, some information is communicated...
In the design flow of Multi-Processed Systems-on-Chip (MPSoCs), the evaluation of communication structures play a very important role, since it may reveal relevant information on performance, energy consumption and cost. Simulation under a number of stimulus given by a traffic generator is a relevant solution for MPSoCs performance analysis. Traditional traffic generators based on Poisson and classic...
A crude oil production and shipping terminal was built and expanded over time such that the facility was powered by three isolated power systems. These separate plants have since been interconnected to permit the sharing of generation reserves. Initially, the interconnected system was supervised by a power management system (PMS) that relied on isochronous operation of one power plant for frequency...
In this paper an algorithm for calculating the steady state of electrical networks including wind and photovoltaic generation is presented. The wind generators considered are; squirrel cage induction generator and doubly fed induction generator. The proposed algorithm is based on the formulation of nodal power injections that is solved with the Newton Raphson technique using complex matrices notation...
This paper applies ultra-local models (also labeled intelligent PID) to Automatic Generation Control (AGC) for a Multi-Area power system in the presence of communication delay. The AGC model is built in Simulink/Matlab and co-simulated with Network Simulator 2 (NS2) through PiccSIM, a simulation platform for (wireless/wired) networked control systems. A careful comparison is made between the performance...
High levels of renewable energy sources (RES) can significantly impact system stability and system resilience as conventional generators are replaced by these units. Typically, positive sequence models of RES are used for stability analysis and interconnection studies of RES. Although these models can accurately represent the dynamic behavior of RES, there are certain limitations of their usage. This...
This paper analyzes the impacts of using distribution-level locational marginal prices (DLMPs) as a basis for valuing generation connected to low-voltage distribution feeder systems. The consistency between economic signals embedded in DLMPs and the impacts of distributed generation (DG) on the operation of low voltage grids is analyzed. We investigate how the revenues captured by DG agents connecting...
Photovoltaic generators can provide several benefits for distribution networks, such as power loss reduction, and improvements in voltage level. However, high penetration of these generators can cause voltage rise problems in the distribution network. In this way, voltage control strategies are necessary so that the voltage levels are within the range of operation for any load and generation conditions...
In 2008, Brazil started using a mechanism to enable the sharing of network facilities for connecting small-scale renewable generators to the transmission grid, which led to opportunities to capture economies of scale and benefits to generators and energy consumers. In practice, the mechanism was virtually abandoned in recent years. This paper presents an alternative to revisit this mechanism. The...
The purpose of this work is to find the optimal location of sliding mode control and power system stabilizer in order to damp electromechanical oscillations in the power system using the residue method. The proposed control is evaluated performing several simulations on a modified version of the 39-bus New England power grid. A modal analysis is performed at the test system in order to evaluate numerically...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.