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.
The paper analyses energy production and consumption recorded for the Romanian power system in selected days and shows how storage resources can mitigate situations with 100% CO2 free and 100% RES respectively, by simulating through scaling the production based on these new scenarios. The study assumes a similar power exchange with neighbors, to avoid drastic network reinforcement and to improve regional...
This paper proposes modelling ranked load curves using algebraic polynomials. Starting from the assumption of some characteristic parameters of load profiles: maximum power, minimum power and the energy consumption in a time period, characteristic coefficients of different types of algebraic polynomials such as: linear, parabolic and third-order are obtained. The modelling of real load profile has...
This paper presents a toolbox created with the purpose of offering support for power engineering students to better understand the power system steady-state operation and active power flow control using a phase-shifting transformer (PST). The toolbox consists of a graphical user interface (GUI) that allows the user to define scenarios, run the load-flow calculation and select scenarios in order to...
This paper proposes a novel optimal reactive power dispatch model based on genetic algorithms, utilizing a comparative study on selection methods: roulette-wheel selection and rank selection. Performance of individuals is evaluated based on load flow solutions. A mixed current-power mismatch method is utilized for load flow calculation. The effectiveness of the proposed algorithm for solving the ORPD...
The Distributed Generation (DG) systems of today face a multitude of problems, among which the pollutant emissions and the energy efficiency play a key role. In this sense, the study of optimal operation strategies for such systems becomes highly important. Thus, the purpose of this work will be to investigate using the Nondominated Sorting Genetic Algorithm II (NSGA II) the operation of a 4 gas microturbine...
This paper focuses on the active power loss minimization by optimal voltage control in a power system using a new optimization algorithm. The cost function is assumed to be convex. The algorithm we propose to address the numerical solution of this problem is based on the exploitation of the convex problem structure using a sequential convex programming framework that linearizes the nonlinear power...
This paper presents a strategy for optimal generation scheduling in a microgrid. Several small generation units of different type are considered, that is a wind system, a photovoltaic system and a gas engine unit. In order to maximize the use of renewable energy sources (RES) a storage battery is also integrated. Two generation scheduling algorithms are elaborated, either aiming at minimizing the...
This paper presents a mathematical model used to calculate the symmetrical components of the load current in electrical distribution networks of low voltage. Based on the mathematical model proposed power lines were calculated tasks under sinusoidal. Case studies dealt with non-symmetric mode due to load imbalance on the distribution network of low voltage. Analysis of case studies was done by modifying...
A method for on-line voltage stability monitoring of a power system based on Multilayer Perceptron (MLP) neural network is proposed in this paper. Considering that the power system is operating under quasistatic conditions, by using power flow model and singular value decomposition of the reduced Jacobian matrix, a suitable index to quantify the proximity of power system voltage instability is defined...
This paper presents a new algorithm for short-circuit currents calculation in distribution networks in which distributed generators are connected. The specifications of the IEC 60909 Standard are applied, in which the fault is replaced by an equivalent voltage source. The algorithm consists in two steps: a forward sweep, in which the aggregated impedances between each bus and the neutral point are...
This paper presents a laboratory hardware system, developed in the Department of Electrical Power Systems of University “Politehnica” of Bucharest, that simulate an energy management system to be applied in a smart home. The core of the system is a controller that is capable of switching on/off various domestic appliances as a response to price signals. The system may be capable of communicating with...
The present paper deals with the power quality analysis in a wastewater treatment plant. The measuring campaign was conducted for 1 week and has the objective to investigate the energy efficiency and power quality impact of the plant functioning. The wastewater treatment plant is located in the east side of Romania, in the second largest city of Romania and on the Black Sea seaside. The analysis revealed...
In this paper the authors propose a market strategy of a microgrid incorporating a virtual power plant. For exemplification, a configuration consisting of different types of distributed generators and a lumped load are considered. The aim of the virtual power plant is to maximize the profit by minimization of the total cost involved for electrical energy generation by the distributed generators that...
This paper presents a procedure for minimizing the costs involved with the reactive power - voltage control using the synchronous generators/compensators as ancillary service. The procedure combines an optimal power flow algorithm and the secondary voltage control algorithm, the first aiming to minimize the reactive power costs injected/absorbed by the synchronous generators/ compensators, while the...
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.