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The German Energy Transition puts enormous pressure on the existing grid operation and planning. At the same time, battery technology is developing rapidly and has the potential to reduce stress on the grid and increase the profitability of renewable energies if implemented in a market that provides sufficient revenues. The motivation behind this paper was to take most recent developments in the price...
Energy policies of today put considerable pressure on operators to eliminate losses that appear in the process of delivering electricity. Together with a new view of what a distribution network should represent, it is clear that classic distribution methods need to become smart grids. A system that responds to changing requirements in terms of energy consumption becomes more and more attractive. This...
Increasing the number of electric/electronic devices powered with electric power, has led to a series of different chargers and a mixture of wires spread through the house or office. For a long period of time, the concept of charging without any direct connection through wires was avoided, but the last few years show an increased interest to make the loading with electrical power more flexible and...
The paper deals with the design of an electric locomotive drive system used in electric railway transportation. The drive system consists of an induction motor and a voltage source inverter. A dedicated induction motor design algorithm is developed, in order to improve the motor efficiency. The design of the induction motor was realized with MathCAD and validated with Matlab Simulink. In the second...
Switched networks modelling lead very often to discontinuities of circuit's variables corresponding to switching time moments. This phenomenon is said to have inconsistent initial conditions (IIC). The IIC problem appears only for ideal switches in ideal circuits when, after switching, the circuit contains excess elements. As a consequence, Dirac delta functions and their derivatives can occur in...
This paper presents a comprehensive survey of the energy harvesting concept in the current social and technological context, with the intent to draw attention to linear generators, in different topologies, as competitive candidates in green energy conversion microsystems. The emerging technologies of energy scavenging are discussed, examining both the environmental sources and a selection of applications...
A brief review of technical solutions for the implementation of controlled "flexible" connection of asynchronously operating power systems was made. Transmission of active power between power systems with the same nominal frequencies, linked via phase-rotating transformer is examined. The device is based on hexagonal scheme, which provides symmetrical 12-phase output system of voltages,...
World of industry in this moment doesn't offer possibility to have unlimited time for maintenance. When a breakage it is happen, in a limited time you need to solve the problems. In this article we are proposing a solution for a good management of accidental maintenance. Our solution is a little module that can be interchanged in a system when the breakage of this appear. The module that we propose...
The development of IPC technology provides additional opportunities to improve the controllability of widely branched heterogeneous electric networks. The objective of this paper is to present innovative variant of decoupling interconnector that is capable in bidirectional control of active and reactive power flows throughout operating transmissions. A high degree of controllability in this case is...
The increased penetration of RES requires the development of advanced control techniques that can work accurately with improved performance and less computational resources under unbalanced and harmonically distorted grid conditions. The paper sets out with a benchmarking study of two existing current control techniques developed for compensating the harmonics and gird voltage unbalance. The techniques...
This article describes the results of the European Project Empower. This project is about the creation of a trading platform for local energy exchange in local markets. To do so, a system architecture is proposed, based on the Smart Grid Architecture Model (SGAM). The implementation of the developed platform has been tested in the Prosumer Lab environment. The Prosumer Lab is an installation at the...
Today, the stability of the power distribution system is influenced by the significant number of photovoltaic power plants connected to the electric distribution network. This paper aims to present the results obtained after about three years of operation of a photovoltaic plant of 2.8 MW in terms of voltage variation in the common point of connection, power quality. Also, will present results of...
The article describes the requirements for medium-voltage switchgears. It shows the main advantages and drawbacks of the conventional air-insulated switchgears and the relevance of the switchgears with solid insulation and solid shielded insulation. The use of this insulation system allows to reduce significantly the size of switchgear and to improve considerably the safety of its operation. The analysis...
With the evolution of IEC 61850-9-2 based Process Bus & IEC 61850-8-1 based station bus and the possibility of various architectures, it is important that the protection system be assessed or evaluated for its performance on real time fault conditions. Current differential protection stands out as it works across multiple substations and multiple line ends, with the variants mentioned below: a)...
Electric domestic appliances are part of our daily life; they improve the quality of life. Significant improvements were achieved these last years with respect to energy consumption of domestic appliances. The modern energy-efficient electric domestic appliances are electronically controlled. Generally, in a three-phase system, they represent an unbalanced and nonlinear load. Their operation may cause...
The paper presents aspects related to the connection of renewable sources of energy to the grid and focuses on the Photo Voltaic Power Plant (PVPP). The correlation of this process with Power Quality (PQ) issues and conditions for certification of each plant in accordance with regulations are included in our work as well. Results of measurements of PQ in the Points of Common Coupling (PCC) in the...
The paper is concerned with the behavior of a transformer used to supply the excitation from a power group. Waveforms from the transformer secondary winding were recorded and analyzed. Numerical simulations were performed in order to evaluate the performances of different solutions for the improvement of transformer operation by means of diminishing the current and voltage harmonics. Passive filtering...
The paper is concerned with aspects related to the reactive power compensation capacitors influence over the current and voltage distortions. This work aims to discover if the use of capacitors for the reactive power compensation have more drawbacks than positive effects. A solution of compensation is modeled and simulated in the MATLAB/Simulink software environment. The compensation algorithm is...
This work presents current and voltage waveform data recorded from Ayia Anna wind farm in Cyprus and the subsequent analysis in Matlab using Fast Fourier Transform (FFT) algorithms. The analysis aims to investigate whether the harmonic content, is within acceptable IEEE standard limits. Recorded data were arranged in descending order with respect to output power generation. Total harmonic distortion...
DC Motors are important components for the automotive industry, but they're also a strong electromagnetic interference (EMI) source. Knowing this problem, conducted emission (CE) tests and Voltage Transient Emissions (VTE) tests were carried out along the power lines of the motor according to the standards CISPR 25 and 7637-2. Conducted emissions from the components which are to be placed on an automotive...
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