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Implementing the spiral inductors in the radiofrequency micrometric integrated circuits is complicated, therefore some prior studies in order to determine their optimum configurations for the circuit in which they will be implemented are necessary. This study is a step forward in the study of spiral inductors, aiming at comparing the monolayer to the multilayer spiral inductors in order to determine...
There are presented the results of the research of the efficiency of multi-agent management of voltage mode in electric grids, diagrams of power delivery of power stations. In the structure of devices for voltage regulation in a controllable area, there was considered the use of the normalizer of AC voltage, in particular as the means of emergency control, controlling the stability of motoring load...
The design process of a rectangular waveguide pyramidal horn antenna is carried out. A mathematical design algorithm is developed and implemented in Matlab. The antenna model is built afterwards, accounting for the same computed parameters, with two different dedicated antenna design and simulation software packages: CST Microwave Studio and ANSYS HFSS. Both are based on the Finite Element Method...
Engaging MV and LV end-users in providing ancillary services to the main grid is a very interesting scenario, in which the traditional interactions between Distribution System Operators and customers are significantly modified. In this work, a novel pricing structure is introduced to investigate how the behaviour of active end-users, including local generation and storage systems, could be influenced...
With the increase in the availability of information regarding energy use, there is an increase of forecasting software on the energy market, that can forecast on the short, medium and long term. In the paper, there is presented a software solution for load forecasting using Artificial Neural Networks (ANN) method. In the case study, we have written an application for a consumer which is engaged in...
The paper deals with a series of issues relative to power quality in drive systems and the behavior of a load composed from a uncontrolled rectifier, chopper and a DC motor. A MATLAB-Simulink scheme was designed in order to study the possibility to eliminate the unwanted power-related effects from the system. An equipment having the role of active filter is modeled and studied. The active filter is...
Computational techniques conceived to improve the efficiency of PQ analysis of quasi-stationary signals acquired from the secondary winding of the excitation transformer in a power plant are addressed. Signals of 30 periods (SN) were analyzed. SN were polluted by white Gaussian noise and "arithmetic average" signals (AS) of one period length were computed for 2 reasons: (a) simpler noise...
In this paper we examine a new architecture for the inverter used in the conversion of electric energy produced from sources of renewable energy. This type of inverter is particular because the compensation of current with double frequency is performed by a special block. In this block, like in the inverter, the switching of electronic keys is realized using the Triangular Current Mode method, which...
This paper investigates the effectiveness of using different decision-making frameworks in local energy systems (LES) through the assessment of the long-term equilibrium of energy players. For this purpose, the energy system is modelled through two levels of multi-energy player (MEP) and LES, coupled by energy price signals. The conflict between the decision-making of these two levels of players is...
Current differential protection works based on the Kirchhoff's current law. The old technique analyse the vector sum of the measured currents and detect faults in the protected area, but for that, we need to rely in an asymmetrical sampling using a ping-pong delay measurement technique or an external equipment to provide a time source referenced (e.g., GPS-synchronized). The new smart Multi-Ended...
Thermo-mechanical stress accumulation in the power electronic integrated circuit (PIC) devices influences their lifetime and reliability. In order to determine both the temperature and the stress accumulation, numerical simulation is a very important tool in the design of PIC devices for quantifying and enhancing their lifetime and reliability. An open source solution integrated in Salome-Meca and...
Big Data impose new research challenges in power system industry. Volume and variety of Big Data are crucial parameters for the validation of data processing techniques. Due to the rapid augmentation of Photovoltaics (PVs) installations in many countries the volume of the collected on-site data continually increases. The scope of the present paper is to provide an analysis on an amount of PV power...
The increasing penetration of distributed generation has lead international authorities to integrate the rules for the connection of active end-users to distribution networks. Thus, power regulating functions aiming at supporting the voltage and frequency stability of the main grid have been recently introduced in European grid codes. In this paper, the consequences of adopting such regulating functions...
This paper presents a harmonic study of different parallel photovoltaic (PV) systems connected to a low voltage distribution network to identify potential resonance between PV inverters and system impedance. LCL filters are commonly employed in PV inverters and recommended by IEEE 929–2000. These filters, however, by interacting with each other as well as with the system, may generate multiple harmonic...
The monitoring of the load assumes a fundamental role in contracting of locational economic amounts of the Transmission Network Use of System (TNUoS) tariff, in this way, it becomes attractive to use computational models of demand forecasting as tools, subsidizing more precise estimates of investments and enabling the attendance of the Reliability. In this context, the present work demonstrates a...
Transformers are the most complex and costly components of the electric power grid and that is why there are monitoring systems for most operating parameters except for the winding axial clamping forces. It has been demonstrated that they vary in time as a result of stresses to which the transformer is subjected. An objective assessment of the lifetime mechanical stability can be made only by the...
In this paper we present some aspects about the design of a small permanent magnet wind generator with axial magnetic flux often used in residential wind turbine. There are presented the main steps of the magnetic and electric calculations with applications to a specific case: 0.6 kVA wind generator, and the finite elements analysis of the excitation magnetic field generated by permanent magnets....
Each solar cell has a characteristic current-voltage (IV) curve reflecting its response to both temperature and the incident light level. The key component providing efficiency is the converter, which generates power compatible with consumers. The converter must be adjusted according to the changing conditions of the solar cell array. This is generally achieved using the algorithmic method for continuous...
The measurement of the active and reactive power in three-phase circuits is a field considered closed, in which all the models have been exhausted, in which there are no other ways to investigate and innovate. These statements are generally accepted by the design engineers and viewed with reticence by a small number of researchers. This paper does not attempt to change these opinions so securely fixed...
Experiments were conducted to illustrate the performance of a flywheel energy storage system (FESS) for electrical engineering technology students. The flywheel was coupled to a permanent magnet synchronous machine (PMSM), which can motor to accelerate the flywheel, and which can regenerate electrical power by extracting energy from the flywheel. The PMSM was connected to a battery bank and DC motors...
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