Harmonic current reduction of a six-pulse thyristor converter

Saied, Basil M.; I.Zynal, Hussein

doi:10.1109/acemp.2007.4510575

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…The relation between the injection current, I f , and modulation index of the PWM converter is shown in Eq. (18). It is clear from this equation that the rms value of I f can be easily controlled by controlling the modulation index of the single phase PWM converter.…”

Section: Design Examplementioning

confidence: 99%

“…The third harmonic injection can be transferred to the line current using a zig-zag transformer [16], [20], [22], [23], and, [30]- [32] or a three-phase transformer with an open delta [18], [19]. The required kVA rating of the three-phase transformer with an open delta is 3 times the kVA required for a zig-zag transformer [23].…”

Section: Design Of Zigzag Transformermentioning

confidence: 99%

“…This technique increases the cost due to the interfacing transformer. Other references [18], [19] used star-delta transformer in the reinjection path with an unloaded delta to circulate the injection current through the neutral of the star to the line currents. Some other references [16], [20], [30], and [31] used a partial rating (20%) zigzag transformer to circulate the third harmonic injection current to the line currents to replace the need for a full load D/Y transformer.…”

Section: Introductionmentioning

confidence: 99%

“…9. It is clear from (18) and Fig. 10 that the injection current can be controlled by controlling the modulation index, m a , of the single-phase PWM converter.…”

Section: Design Examplementioning

confidence: 99%

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Novel Third Harmonic Current Injection Technique for Harmonic Reduction of Controlled Converters

Eltamaly¹

2012

Journal of Power Electronics

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Three-phase controlled converters have many applications in the utility interfacing of renewable energy sources and adjustable speed drives as a rectifier or inverter. The utility line currents of these converters have a high harmonic distortion, which is more than the harmonic standards. This paper introduces a new technique for circulating the third harmonic currents from the dc-link to the line currents to reduce their harmonic contents. The proposed system uses a single-phase PWM converter to control the angle and amplitude of the injection current for each of the firing angle of a three-phase converter. A detailed analysis is introduced to achieve a relationship between the firing angle of the three-phase controlled converter and the power angle of the PWM converter. In addition, a detailed design for the other injection path components is introduced. A simulation and experimental work is introduced to prove the mathematical derivations. Analysis, simulation and experimental results prove the superiority of the proposed technique.Key words: Harmonic distortion, Three-phase controlled converter, third harmonic injection, power quality NOMENCLATURE I fThe third harmonic injection current. Ψ optThe angle between V on,3 , and I f for the minimum THD in the line currents in the 180 Hz domain. ΦThe angle between V a and I f in the 180 Hz domain. Φ optThe angle between V a , and I f for the minimum THD in the line currents in the 180 Hz domain. V mThe peak value of the phase voltage.ω The angular velocity of the fundamental frequency. V LLThe rms value of the line to line supply voltage. V dnThe rms value of the voltage between points d and n. V fnThe rms value of the voltage between points f and n. V on,3kThe rms value of the (3k) harmonic of the voltage between points o and n. k =1, 2 , 3, 4, .…….L dc , C dc Inductor and capacitor in the dc-link. Power angle of the single-phase PWM converter. X odfReactance between "o" and "d" or between "o" and "f".

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Section: Design Examplementioning

confidence: 99%

Section: Design Of Zigzag Transformermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…9. It is clear from (18) and Fig. 10 that the injection current can be controlled by controlling the modulation index, m a , of the single-phase PWM converter.…”

Section: Design Examplementioning

confidence: 99%

See 2 more Smart Citations