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This paper presents some aspects of power analyzers utilization, related with your calibration by metrological laboratory. The full metrological characterization of power analyzers is a difficult technical process because the specifications in related standard are minimal. After a short presentation of parameters and measurement methods recommended by the important standards in the field of power...
The momentum of today is focused on smart grid facilities that allow green energies to be used in electrical networks. But an important issue is to have powerful tools at hand able to measure power quality parameters in a flexible way in such grids. This paper present a flexible system designed and implemented to monitor power quality parameters in the power grid. Not only real time monitoring was...
In this paper the performances of photovoltaic (PV) panels has been analysed, for different connections of PV cells, by using the four-terminal theory and Brune's conditions of circuit interconnection. A LabView and Matlab applications have been implemented to prove the theoretical models and to obtain the equivalent parameters of PV cells' connections. The examples presented have shown the comparisons...
The importance of photovoltaic cell/module as a continuous operating system is a well-known necessity. Reliable predictive and preventive maintenance techniques are needed to assure lifetime efficiency in service. For this we need to know what kind of defects can occur, the most probable frequency and where it can appear. The current paper investigates a nondestructive method based on infrared (IR)...
A new method for calculation of first order sensitivity and sensitivity groups for Multiple FeedBack (MFB) filter in non-sinusoidal regime is presented. Such a group of linear dependent parameters is defined the relative input values of current and voltage harmonics. The interdependence of the various network sensitivities for a given network needs special consideration. Numerical example for Butterworth...
The paper proposes a measurement analysis method of the performances of an advanced control system which are used in public street lighting systems. It is presented the hardware implementation of DIMM Light advanced system and the measurement analysis of this system using a Lab VIEW application. By use of the DIMM Light for controlling the switch on points of the public street lighting system we increase...
Using of the wind energy has become increasingly important as a renewable energy source and therefore is an increasing interest in exploiting it using a switched reluctance machine as a generator and optimize its characteristics in this domain. This work analyzes the generator mode of the switched reluctance machine in the direct coupling to the turbine shaft and coupled to the shaft through a gearbox.
The model of the squirrel cage AC Motor is based on multiple coupled circuits and takes into account the geometry and winding layout of the machine. All inductances are derived by means of the winding function approach and are integrated with the decomposition into their Fourier series. An important issue in such effort is the modeling of the induction motor including rotor slot harmonics (RSH) under...
The three - phase electric arc furnaces represent one of the important generators of harmonic currents, reactive power and unbalanced conditions in the electrical power supply networks. This paper presents a study with experimental results concerning the parameters of quality of electrical energy at three-phase electric arc furnace.
The paper presents a new systematic analysis method in order to calculate the absorbed power in D.C. networks with modifiable parameters. The relation between the change in one or all the resistances of the networks, and the variation of total absorbed power are discussed using the Lagrangepsilas multipliers, and the bilinear theorem. The results obtained with the dedicated software Mathematica 6...
Fast Fourier transform (FFT) computing may improved using two ways: the first way consist in packing two separate real functions into the complex input array in such a way that their individual transforms can be separated from the result; the second method used to improve the FFT computation consists in packing the real input of length N array cleverly, without extra zeros, into a complex array having...
The paper presents the results of a new mathematical method to calculate the power factor in the electroenergetical circuits. The relative values which characterize the voltage and current harmonics have been used. The MathCAD example will prove, comparatively, the efficiency and the application of this method
This work deals with the computation of the sensitivities in electrical networks and their invariants. This paper presents a method for computation of the sensitivities in electrical steady state linear networks, correlating it to the new four parameters which characterize the current and respectively voltage harmonics. The given example is used for the discussion of some aspects related to the sensitivity...
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