Eduardo Antonio Cano Plata

Instantaneous power tensor theory: Improvement and assessment of the electric power quality

This paper presents a new theory to improve and assess the quality of electrical power. The theory is based on the tensor product between voltage vectors and n-phase currents. This new definition allows the estimate of reference currents for the control of active power filters “APFs” in multiphase systems and also determines a quality deviation global indicator. In addition, the improvements (implementing an ideal APF) and the assessment (measuring the global deviation) of electric power quality are validated by means of a practical case.

ELECTRIC POWER DEFINITION IN THE WAVELET DOMAIN

This paper discusses the definition of active and reactive power in wavelet domain. Different definitions for three-phase power may cause significant changes in the measurement equipment topology. The simple phase shift using the Akagi method between current and voltage for reactive power measurement is discussed. A new power quality analysis technique (pqAT) is proposed.

Estudios por impedancia eléctrica de nanoestructuras de ZnO

Structural and electrical impedance studies were carried out in ZnO semiconductor nanostructures, this particles were synthesized in powder and films on glass substrates. Also, it is described the process of films growth using the method SILAR, which is derived from the CBD (Chemical Bath Deposition) technique. XRD analysis shows crystallite sizes of up to 100 A, and textures ratios between 3.5 and 1.5 as well as influence on the film quality due to the zinc precursor employed. The spectroscopy impedance technique indicates that ZnO powder compacted presents a highly resistive behavior with 3.2x108 �, this suggest that the material tends to behave as pure capacitive.