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In practice, vector control methods are widely used offering the possibility to reach high performance. Certain application areas need optimum control in at limit operating conditions, as, operation at maximum torque. The paper presents how through the proposed control scheme at the output of the flux and the voltage controllers, provide direct the frequency and voltage values for an asynchronous...
As shown title, the present paper presents an experimental study on cooling microprocessors with micro channel heat exchangers. A testing bench was necessary to design. The originality of the solution to achieve the cooling mode of the microprocessor. As a heat source it was used a computer whose microchip was placed in maximum heat load using a specialized program. The results obtained from the test...
The paper presents numerical models obtained in QuickField software for analysis of the three-phase systems of rectangular busbar, of low or medium voltage, in steady-state and in short-circuit regime. Using a magnetic harmonic model coupled with a steady-state thermal model, the distribution of the thermal field for rated current is determined. By coupling the thermal steady-state model for the rated...
In this paper, using Lab VIEW graphical programming environment are made a number of virtual instruments which are used at the demo/study of low power active filters with operational amplifiers (op-amp). There are analyzed the active first order low pass, high pass and band pass filters. The results are included in two papers. The first one contains the simulation of active filters. The different...
In this paper is proposed an optimized solution of DC electromagnet using design of experiments (DOE) and FEM. Before optimization, the technique of screening was applied to determine the most influent geometrical parameters on the static force characteristic. For this purpose, the response function was chosen to be the root square of the average of squares of the relative force for five values of...
This paper proposed a fuzzy logic control (FLC) based maximum power point tracking (MPPT) of a photovoltaic (PV) system under standard temperature condition (STC) and variable connected load. The PV system including a PV module BP SX150S, buck-boost DC-DC converter, MPPT, and resistive load is modeled and simulated using Matlab/Simulink package. In order to compare the performance of the conventional...
In this paper the influence of the multi-core architecture on the processing time for solving a 2D problem, described by a non homogenous Poisson PDE, in COMSOL, was considered. Only the direct solvers were taken into account. Different levels of mesh refinement were compared and different Lagrange finite element orders have been used.
The paper presents a short draft of history of the development of the power theory of systems with nonsinusoidal voltages and currents. It starts from the Steinmetz experiment run in 1892 and ends with the development of the Currents' Physical Components (CPC) — based power theory. A draft of the CPC and the major contributions to the power theory and methods of compensation are presented as well...
Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
This paper presents some considerations on designing and simulating permanent magnet motors with AlNiCo magnets. The design parameters of the motor considered during the simulations, along with the equation describing the motion and equations describing the involved electric model are presented. Finite Element Method Magnetics (FEMM) was used to make a bidimensional magnetostatic simulation of the...
In this paper there are presented the constructive variants of reluctance synchronous motors. A special attention is paid to the main features, their advantages and drawbacks. In order to confirm this study there have been carried out experimental tests with a flux-barrier motor. There are presented the circuit we used and the main steady state characteristics we obtained. The paper ends with conclusions...
The energy is used in a building in different form: thermal energy for heating and hot water consumption, electricity for lighting and to supply electromechanical installations. Regardless of destination, buildings require a certain amount of energy. This article presents a calculation of heat consumption related to civil buildings (houses) through the financial impact that it has on economic and...
The paper presents the automatic control of aircraft in the longitudinal (vertical) plane during landing, taking into account the atmospheric turbulences. The presented structure of automatic landing system consists of two coupled automatic control systems: the former is used for the control of aircraft longitudinal velocity, while the latter performs the control of the flight altitude by means of...
Power and instrument transformers represent important components of electric power transmission and distribution stations. An important indicator of the condition of the insulation of such equipment is the evolution of the partial discharge (PD) level, since an increase of this level usually indicates the development of a fault affecting the insulation quality. Detection of partial discharges in the...
Between a human person, who can be electrostatically charged at voltages of 10–15kV, and an electronic device (computer, laptop, memory stick, tablet, mobile phone, etc.), a system connected to grounding, an electrostatic discharge can occur due to the person's electric load charge (electrification), wearing clothes made of synthetic fibres, due to friction with the air. Electrical discharges due...
This paper presents the architecture and control system for a hexapod robot with unconventional actuators. Each leg of the hexapod robot is a hyper-redundant soft robot, acted with electrorheological fluid. The possibilities of movement of the robot enable it to perform movements in any regime of movement. For example: displacement of robot body with parallel plan movement, on uneven ground, rotating...
This paper summarizes the results of a three-phase load flow analysis case study. This work was part of an overall energy systems modeling and analysis effort designed to develop a validated power flow study that facilitates understanding of power flow concepts for the present distribution networks operating in asymmetry conditions. To simplify data collection requirements and illustrate key concepts,...
The Conservative Power Theory (CPT) is one of the latest approaches to definitions of powers and compensation in systems with nonsinusoidal voltages and currents. It is shown in this paper that the CPT misinterprets power phenomena in electrical systems, however, and it does not create right fundamentals for the power factor improvement by reactive compensation. In particular, capacitive compensation...
This paper presents the principle of a load flow algorithm adjusted to asymmetrical operation of the three-phase distribution networks. The algorithm is based on an iterative procedure, which is independently applied on three equivalent sequence networks and uses a phase-to-phase equivalent model for unbalanced loads connected to the analyzed network.
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