This work presents a substantial improvement of the variables’ inclusion and interchange algorithm (VIIA) for capacitors placement that considers circuits with harmonic distortion. Several load states are considered, fixed switched employed in optimization. All pertinent constraints voltage magnitude, total distortion, individual overstress implemented. The here defined global harmonic-distorti...

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...

An adaptive fuzzy control system with supervisory controller is proposed to improve dynamic performance of three-phase active power filter APF . The proposed adaptive fuzzy controller for APF does not build an accuratemathematical model but approximates the nonlinear characteristics of APF using fuzzy approximation. The adaptive law based on the Lyapunov analysis can adaptively adjust the fuzzy...

In this paper stator current during crawling of induction motor has been assessed. Three phase current signals have been transformed into Clarke plane. Specific reference signals having sinusoidal nature and different frequencies have been defined and then areas formed by the real system data with the reference signal have been determined, wherefrom individual contributions of fundamental wavef...

This paper proposes an active and reactive power control strategy based on predictive control approaches applied to gridconnected renewable energy systems. To accomplish this a multi-modular matrix converter topologies are used in combination with a simple but efficient grid synchronization strategy. The theoretical performance analysis is performed considering a six-phase wind energy generator...

An optimized multilevel inverter is implemented for 3 phase induction motor drive. The Main Feature Of this Circuit is to boost of the Battery Voltage as twice as possible along with multilevel staircase output voltage which approaches nearly sinusoidal wave. By using appropriate switching strategy of two capacitors the desired waveform can be achieved, hence significantly reducing the number o...

© 2009 ETRI Journal, Volume 31, Number 5, October 2009 A novel tunable transconductor is presented. Input transistors operate in the triode region to achieve programmable voltage-to-current conversion. These transistors are kept in the triode region by a novel negative feedback loop which features simplicity, low voltage requirements, and high output resistance. A linearity analysis is carried ...

This paper proposes a new discrete fuzzy-tuning current-vector control (FTC) scheme for three-phase pulsewidth modulation (PWM) inverters. The proposed current control scheme can achieve fast transient responses and, at the same time, have very low total harmonic distortion in output current during steady-state operation. The proposed FTC scheme generates quasi-optimum PWM patterns by using a c...

=AbstractSingle-stage current-source charge-pump powerfactor-correction (SS CS-CPPFC) electronic ballast employs charge-pump concept to obtain high power factor with low cost. However, the circuit has a poor lamp current crest factor and large lamp output power variation, which deteriorates the lamp life. Feed-forward and/or feedback circuit are usually used to deal with these problems at the p...

We analyze and present an input gain-varying scheme for maximizing dynamic range in a well-known Gm–C bandpass filter by both minimizing noise for small input signals, and by achieving balanced swing levels at all filter nodes for large input signals. A micropower bandpass filter suitable for use in cochlear implants and other powerconstrained biomedical applications was implemented and tested ...