For high-power converters, the low switching frequency (SF) modulation represented by selective harmonic elimination pulse width (SHE-PWM) is crucial to reduce loss and enhance efficiency with a good steady-state performance. However, since advantages of SHE-PWM mainly come from fixed angle distribution limited non-linear equations, angles should be adjusted slowly. This requires that bandwidth...

This paper studies a particular single-stage power-factor-correction (PFC) switching regulator employing a discontinuous-conduction-mode (DCM) boost-input cell and a continuous-current-mode (CCM) forward output cell. Although this single-stage PFC regulator can provide a reasonably high power factor when its PFC stage is operating in discontinuous mode, substantial reduction in line-current har...

The uncontrolled three-phase bridge rectifier has the least line current distortion among six-pulse rectifiers; however, its total harmonic distortion (THD) of 31.08% is unacceptable as per the contemporary power quality standards. This paper seeks to address the issue by elimination of triplen harmonics in the line currents by providing a deltawye transformer at the ac interface i.e. between t...

nowadays with increasing use of numerous nonlinear loads, voltage and current harmonics in power systems are one of the most important problems power engineers encounter. many of these nonlinear loads, because of their dynamic natures, inject time-varying harmonics into power system. common techniques applied for harmonics measurement and assessment such as fft have significant errors in presen...

In this article, a hybrid Artificial Neural Network - Newton Raphson (ANN-NR) is introduced to mitigate the undesired lower-order harmonic content in cascaded H-Bridge multilevel inverter for solar photovoltaic (PV). Harmonics are extracted by excellent choice of opting switching angles exploiting Selective Harmonic Elimination (SHE) PWM technique accompanying unified algorithm order optimize a...

Thyristor controlled static compensators consist of two basic schemes, TCR and TSC. Owing to the discontinuous current in TCR, current harmonics are generated in the supply system. This paper introduces two methods for the reduction of these harmonics. On the basis of the coordination or uncoordination of turn ratios with harmonic reduction levels, each method is described in two alternative sc...

Regular-sampled PWM techniques have been developed to reproduce the harmonic-elimination and harmonic minimization PWM characteristics. These new regular-sampled PWM control strategies significantly reduce the computational requirements for real-time microprocessor-based PWM implementation. This results in simplied and more efficient microprocessor softwarehardware requirements, leading to real...