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The Institute for Energy Engineering (IIE) of the Universitat Politècnica de València (UPV), lea...
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ELECTRICAL EQUIPMENTS AND SYSTEMS AREA

In recent years, research tasks in this area have been developed on three main lines: numerical methods for the design and analysis of machines and devices, industrial automation of machinery and electrical installations and diagnosis of faults in electrical machines using advanced techniques of signal processing. This area includes also the research on energy efficiency in electrical systems made by the GINTEC research group.

The main lines of research that are in keeping with this area are described below.

1. NUMERICAL METHODS FOR THE DESIGN AND ANALYSIS OF MACHINES AND DEVICES.

This line of research focuses on the application of modern numerical methods to modeling of electrical machines and devices (although the results are extrapolated to other elements and devices), to facilitate both their analysis and their design. In this linee, the research on techniques to reduce the cost of computation required for modeling (tools for model reduction) is one of the objectives pursued by the group.

2. INDUSTRIAL AUTOMATION OF MACHINERY AND ELECTRICAL INSTALLATIONS.

This area is dedicated to the development and implementation of industrial automation systems, using software that is freely accessible and easy to use by non-experts in techniques of control. In this regard, we have developed systems based on object-oriented programming that have been applied successfully to the automation of various industrial operations such as injection molding processes.

This line of research is mostly industrial. It has made possible the establishment of numerous contacts, and obtaining financing. However, the possibility of developing scientific publications in this area is limited by the confidentiality clauses in place, due to the nature of the projects in which we participate, and the industrial partners involved.

The most relevant result obtained in this area has been the participation in two recent projects funded by the European Commission, one of them recently completed and another that has just begun.

3. DIAGNOSIS OF FAULTS IN ELECTRICAL MACHINES USING ADVANCED TECHNIQUES OF SIGNAL PROCESSING. 

This line of research the group has experienced remarkable progress over recent years. The line's main objective is to develop robust techniques that allow reliable diagnosis of a wide range of electromechanical faults in electrical machines.

In this line we propose a new approach based on the analysis of the current demanded by the machine during the transient processes in which it operates (instead of analyzing the steady state), as an alternative method of diagnosis because it offers, some cases, significant advantages over stationary analysis. Specifically, we propose the study of the current demanded by the machine during startup, easily monitored by noninvasive methods.

The extensive research carried out has resulted in a wide range of techniques applicable not only to the analysis of transients, but also stationary, based on different tools TFD: techniques based on wavelet transforms (Discrete Wavelet Transform (DWT), wavelet transform continuous (CWT), Analytical Wavelet Transform (AWT), etc ...), on Hilbert Transform (HT), on Hilbert-Huang Transform (HHT), on instantaneous frequency (IF) of lower side harmonic (LSH on Wigner-Ville Distributions (WVD) and Choi-Williams (CWD), on Teager-Kaiser, on the polynomial transform, on the fractional Fourier transform, etc. In addition, these techniques can be applied to other fields of technology.

4. ENERGY EFFICIENCY IN ELECTRICAL SYSTEMS

Research tasks have been conducted in this line since 15 years on. An owner theory about the original electrical power have been developed. This theory establishes new magnitudes that are more appropiate to the energy performance of electric systems. Some of these magnitudes were ratified, some of them explicitly and implicitly others, by the IEEE Std 1459-2000, and beyond.

Specifically, the group has been pioneer in formulating the power of imbalance of charges in a complex form (phasor imbalanced power) and also in breaking the fundamental reactive power up in two components: the first one depending on the loads and the other due to imbalances.

The use of these magnitudes and the coefficients derived from them has allowed a better assessment of the efficiency in electrical systems and also to propose more appropriate devices to improve the efficiency. In the first line, measuring instruments and patterns of these new units, as well as evaluation software have been developed and licensed. On the second line, active and passive devices to compensate for imbalances in electricity networks have been developed and patented.

Currently the research focuses the development of devices for the calibration of new magnitudes and new devices for inefficiencies compensation.