This paper presents an algorithm for estimating the Total Harmonic Distortion (THD) in the electrical power grid nodes, which is based on a load flow analysis by frequency component. The aim of this algorithm is, on the one hand, to model the linear and non-linear loads which would be part of an electrical network and, on the other hand, to estimate the THD which would appear in the network nod...

The relationship between space vector modulation and regular-sampled PWM techniques for hard-switching PWM inverters and rectifiers are reexamined in this paper. Space vector modulation with optimized apportioning of null vector time that results in minimum current THD is investigated and is compared with previously known methods. The conventional optimal regular-sampled PWM method and its rela...

This paper proposes asymmetric cascaded H-bridge multilevel inverter with reduced number of switches suitable for industrial applications and renewable energy too. Cascade Multilevel Inverters are very popular and have many applications in electric utility and for industrial drives. When these inverters are used for industrial drive directly, the THD contents in output voltage of inverters are ...

Front end current distortion of rectifier converter leads to low power factor, high THD, distribution system losses, neutral harmonic currents, over rated power equipments in a power system. In addition, the presence of harmonics in line currents may lead current distortion, create additional heating and over voltage problem, loading and losses in the utility distribution systems. The aim of th...

Transanal Haemorrhoidal Dearterialization (THD) has been increasingly used as an alternative technique to conventional surgery for the treatment of haemorrhoidal disease (HD) [1]. The association of mucopexy to the simple dearterialization makes THD suitable for fourth-degree HD, when the prolapsing component plays a major role in symptoms development [2]. Performing THD, as originally describe...

We investigate the influence of two important practical design parameters on total harmonic distortion (THD) for the design of low-voltage (0.9–1.4 V) low-power analog Class-D amplifiers: the linearity of the carrier waveform and the impedance of the output stage. We show that the carrier nonlinearity results in THD and propose a novel mathematical analysis method to model the nonlinearity. We ...

Superconducting BSCCO thin films were obtained with high deposition rate (about 35 nmlmin) at temperatures of 720-8100C by MOCVD-technique. Characteristics of evaporation process of precursors were determined. The influence of deposition temperature and oxygen e a l pressure on superconducting phase formation and chemical composition of the films was studied. For recent years many studies were ...

BACKGROUND Graves' disease (GD) is a common cause of hyperthyroidism resulting in development of thyrotoxic heart disease (THD). OBJECTIVES to assess cardiovascular disorders and health related quality of life (HRQoL) in patients with THD secondary to GD. PATIENTS AND METHODS All patients diagnosed with THD secondary to GD between January 2011 and December 2013 were eligible for this study....

Making an extensive use of small transfinite topological dimension trind, we ascribe to every metric space X an ordinal number (or −1 or Ω) tHD(X), and we call it the transfinite Hausdorff dimension of X. This ordinal number shares many common features with Hausdorff dimension. It is monotone with respect to subspaces, it is invariant under bi-Lipschitz maps (but in general not under homeomorph...

A relatively new therapy in the treatment of hemorrhoids is transanal hemorrhoidal dearterialization (THD). We report a case of brain abscess caused by Streptococcus milleri following THD. Although a brain abscess after drainage of a perianal abscess has been described in the literature, no report exists of a brain abscess following treatment of hemorrhoids. A healthy 51-year-old man with hemor...