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The objective of this paper is to underline the potential as well as the control advantages of the modular-multilevel high-voltage-direct-current converter (MMC-HVDC). Firstly, a brief overview of the MMC-HVDC technology is given and the detailed equivalent model for this converter is presented. Secondly, a heavy focus is applied to the control of a converter substation. Thirdly, a Matlab simulation...
The paper presents results of original investigations of features of the state estimation of the power system with a quadrature booster, which is differently considered in calculations. In investigations, one takes into account a case, in which characteristic features of the quadrature booster are considered, and a case, in which the quadrature booster is treated as other phase shifters. The state...
Industrial tests of high voltage equipment insulation at impulse voltages are carried out following rigorously described procedures and require, as a rule, long time duration and, implicitly, significant costs. Reducing the duration of these tests, as well as the possibility of disruptive voltage prediction has been always an objective of interest. This paper involved the rigorous statistical processing...
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...
In this work, a multiple synchronous reference frame (MSRF) based plus optimized Moving Average Filter (MAF) is employed to extract the harmonics and interharmonics components of a three-phase current waveform recorded from transformer substation that feeds Electric Arc Furnace (EAF). EAF currents are one of the most critical issues in power quality (PQ) that usually cost issues like the light flicker...
Appropriate planning of maintenance activities is a very useful method for reducing operating costs and enhance power system's performance. High Voltage Direct Current (HVDC) Transmission Systems contribute to the achievement of higher flexibility and increased transport capacity, their availability being therefore particularly important in today's global energy landscape. Given that HVDC schemes...
Microgrids (MGs) represent surely the most challenging topic in electrical engineering, promising the decreasing of carbonization, the totally integration of different renewable sources and a cheap solution for those rural areas where electric distribution is economically unsustainable. The most important feature of a MG is represented by the possibility to work in islanded configuration in order...
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,...
In this paper is presented the mathematical model for the optimization of a radial electric network, taking into account the cost of investment in an electric line, the cost of line losses and the cost of load supplied from a source and constraints. The constraints are for sources, for loads and for the power lines. The purpose of the paper is to determine the optimal configuration (graph) of a test...
This paper presents a design approach to an embedded monitoring system found in distributed renewable energy power systems. The grid connected distributed power system, delivers energy to the consumers located on the micro-grid, operating at distribution voltage levels, and also delivering the remaining surplus energy to the main distribution grid. The aim of this paper is to present the development...
The never-ending increase in energy demand across the globe requires a new approach towards efficiency in the production, distribution and consumption chain. A system that achieves minimum operational losses becomes more and more attractive. This paper tackles the energy efficiency in distribution networks by proposing an optimum allocation and sizing of capacitor banks. Using a genetic algorithm,...
The training model of 110 kV step-down substation in 1/10 scale is intended for educational processes improvement of higher education institutions, which carry out training of power industry engineers. The absence of continuous and unlimited access of students to power engineering facilities and the absence of the opportunity to carry out corresponding practical activities result in severe deficiency...
This study investigates price based unit commitment (PBUC) problem which is used to optimize generation schedules of companies in electricity markets. Solution algorithm proposed is based on Dynamic Programming (DP) and Lagrange Relaxation (LR) methods and solves the optimization problem for a generation company having many generating units with different cost characteristics. Unit constraints including;...
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