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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...
The European Union's energy policy focuses on a continuous increase of the renewable sources quota. By the year 2050, the renewable integration level is expected to reach 60–70 %. In order to reach this level, substantial investments are needed as the current tendency is to shift from large centralized power plants to distributed on-site renewable energy sources. By looking at the country of Romania,...
This paper deals with the rising issue of dealing with power quality issues, and aims at assessment of the impact of new smart technologies on existing electrical distribution systems from the reliability point of view. A main point in the analysis performed in this work is the characterization of the electric loads present in the upcoming micro-grids. The power quality assessment has then been performed...
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...
The paper proposes a new mathematical model used to determine the optimum loading for power system substations equipped with only one transformer. Because of the cyclic way of the planning process, the capacity and density of electrical substations are influenced by the technological progress and previous adopted measures. Operations knowledge comes in handy in day by day activities but only strategic...
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 reviews the importance of improving the power supply quality. It presents the main stages for a study of amelioration or improvement of the power quality. A basic description of accounting of the damages caused by poor quality of the electric power is given together with different examples. Then, solutions for pay-back possibility of the quality costs for electric power suppliers and power...
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...
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 are considered. The aim of the virtual power plant is to maximize the profit by appropriate bidding strategy on the electricity market and optimal use of the sources.
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...
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