Microprocessor based harmonic elimination in chopper type AC voltage regulators

Addoweesh, Khaled E.; Mohamadein, A.L.

doi:10.1109/63.53156

Cited by 69 publications

(19 citation statements)

References 7 publications

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“…From figure 4d, it can be noticed that the output voltage harmonic spectrums are approximately similar in both adding and subtracting modes with different fundamental values at 50 Hz and other two components around 200 Hz (chopping frequency/ supply frequency). A comparison between the conventional phase controlled SCR-based and PWM controlled MOSFET-based AC voltage controllers has been introduced by the author through [16], while techniques of harmonic eliminations in the PWM AC chopper have been discussed through [13].…”

Section: Circuit Equationsmentioning

confidence: 99%

“…Such electronic regulators may utilize SCRs or TRIACs devices with phase control technique, while pulse width modulation technique (PWM) may be also utilized using MOSFET or IGBT power transistors. Many topologies of such electronic regulators have been proposed using auto, multi-tapping, compensating or specially designed transformers [3]- [13]. Electronic regulators are promising and have the advantages of fast switching response with possibility of arcing limitations with soft switching techniques and better accuracy with wide stabilizing voltage range due to the utilization of advanced electronic controllers; such as microcontrollers (MC) and digital signal processors (DSP).…”

Section: Introductionmentioning

confidence: 99%

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A new electronic step-up/down voltage stabilizer topology based on H-Bridge AC chopper

Ashour

2008

2008 12th International Middle-East Power System Conference

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The rapid development and high controllability advantages of power electronic devices lead to their application in voltage stabilizers and tap-changers as competitive options with commercially available mechanical counterparts. This paper introduces a new electronic voltage stabilizer topology utilizes four AC switches in a form that may be named as "AC H-bridge" connection, and based on pulse width modulation (PWM) AC chopper combined with a single low power compensating transformer. Such topology eliminates the need of the main input multi-tapping transformer, hence reducing the overall size, weight and cost. Depending on the selected switches and value of the chopping duty cycle, the proposed configuration is capable of stepping up or down the input voltage, hence keeping the output voltage constant with continuous flow of input current and better harmonics restraining in the output load voltage. Mathematical equations describing the function of the proposed topology have been demonstrated and simulation analysis has been presented. Practical verification to confirm the capability of the setup has been illustrated through several experimental results and analysis.

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Section: Circuit Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new electronic step-up/down voltage stabilizer topology based on H-Bridge AC chopper

Ashour

2008

2008 12th International Middle-East Power System Conference

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“…In this case, the input supply voltage is chopped into segments and the output voltage level is decided by the ratio between the ON/OFF periods (Mozder and Bose 1976, Mohamadein and Addoweesh 1989, Choe er al. 1987, Bhat 1981, Roy et al 1984, Rao and Rao 1985, Williams 1982, Addoweesh and Mohamadein 1990, Addoweesh er al. 1991, Hamed 1990.…”

Section: Introductionmentioning

confidence: 97%

An exact analysis of an ideal static AC chopper

Addoweesh

1993

International Journal of Electronics

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A method of harmonic analysis which is employed to determine the harmonic spectra of the input current of a single-phase chopper is presented. The performance of the AC chopper when controlled by a proposed control scheme (equal time ratio control) is presented. It has the advantages of linear control of the fundamental component of the output voltage and ease of generating the control signal. Experimental results verifying the analysis are presented.

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“…2 which indicates that the topology comprises of two type I 4QSW realizations, one in series with the load and the other in parallel. The implementation of the symmetrical multipulse modulation (SMM) [6], [7] technique in the topology has already been been reported. The technique is capable of providing elimination [7]- [13] and even selective reduction [14]- [16] of the lower order harmonics in the output voltage when there are more pulses per half cycle i.e.…”

Section: Introductionmentioning

confidence: 99%

Investigation of harmonic distortion in line and load currents of the sinusoidal pulse-width modulated single-phase AC chopper

Arvindan

Alphonse

2014

2014 International Conference on Computation of Power, Energy, Information and Communication (ICCPEIC)

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This paper presents the single-phase sinusoidal pulse width modulated ac chopper topology with power MOSFET embedded four-quadrant switch (4QSW) realizations and examines from the power quality viewpoint the potential for its use in ac power control. The examination is conducted for resistive and inductive loads by theoretical estimate of the current harmonic content at the ac utility and load. Sinusoidal pulse-width modulation (SPWM) in the ac chopper provides output voltage with symmetrical half cycles that comprise symmetrical pulses with widths and magnitudes proportional to the amplitude of the sinusoidal reference signal. It has two control parameters; the amplitude modulation index (m) and the frequency modulation ratio (p). MATLAB simulation data and results prove that manipulation of m and p alters the harmonic profile of the line and load currents substantially and, therefore, can be used for harmonic mitigation and selective elimination. Thus, cost-effective and compact current harmonic filters can be designed using the SPWM technique.

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Microprocessor based harmonic elimination in chopper type AC voltage regulators

Cited by 69 publications

References 7 publications

A new electronic step-up/down voltage stabilizer topology based on H-Bridge AC chopper

A new electronic step-up/down voltage stabilizer topology based on H-Bridge AC chopper

An exact analysis of an ideal static AC chopper

Investigation of harmonic distortion in line and load currents of the sinusoidal pulse-width modulated single-phase AC chopper

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