Cause, effects, and mitigation of ripple from rectifiers

Mazaheri, Mohammad Hossein; Scaini, V.; Veerkamp, W.E.

doi:10.1109/tia.2003.813728

Cited by 10 publications

(7 citation statements)

References 1 publication

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“…Some of the known effects are explained below [3]. A. I 2 R Loss: For a perfectly dc current, the current will be distributed uniformly across the cross-section of the conductor.…”

Section: Ripple Effectsmentioning

confidence: 99%

Ripple Control in AC to DC Converter

Pyakuryal¹

2013

IOSRJEN

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When a sinusoidal voltage is converted into dc, the output voltage waveform inherently contains ripples. Ripple is an unwanted ac component in dc output. Smaller value of ripple factor is desirable. Ideal value of ripple factor is zero. Zero ripple factor means a perfectly dc quantity. Undesirable effects of the ripple include equipment heating, increased losses, and reduced equipment life among others. Ripple factor of a singlephase half-wave uncontrolled rectifier is 1.21. This value is unacceptably high. To overcome the problem, a single-phase full-wave uncontrolled rectifier is proposed with a ripple factor of 0.48. In this paper, the ripple factor for above mentioned rectifiers with a resistive load is presented mathematically and pictorially. The rectifiers are modeled and waveforms are obtained using a computer program called Alternative Transients program, ATP. At the end, results are presented and compared. Ripple factor was improved by a factor of 40% by using a 2-pulse rectifier instead of a 1-pulse rectifier. Theoretically, if the number of pulses is increased to infinity, the ripple factor will reduce to zero giving a perfect dc output. Subsequently, 6-pulse, 12-pulse, and 18-pulse rectifiers will be modeled and advanced studies will be carried out. This paper will help understand the one of the power quality components called ripple in dc output. The paper will be useful for college seniors, graduated students, and power electronics design engineers.

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“…Some of the known effects are explained below [3]. A. I 2 R Loss: For a perfectly dc current, the current will be distributed uniformly across the cross-section of the conductor.…”

Section: Ripple Effectsmentioning

confidence: 99%

Ripple Control in AC to DC Converter

Pyakuryal¹

2013

IOSRJEN

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“…The common practice to mitigate the harmonic contents is to employ passive filters at the dc output busbars [5]. The influence of filter size on the ripple and EMI factor of dc output current has been studied and presented in Figure 9, 10 and Table IV.…”

Section: Analysis Of Occupational Exposure To Time-varying Magnetmentioning

confidence: 99%

“…There have been several efforts to apply IGBT technology into high power rectifier systems [2]. A chopper rectifier which uses a combination of unregulated diode rectifiers and step-down dc/dc converter using IGBT to generate large controlled dc current has been proposed in previous literatures [3]- [5]. IGCT(Integrated Gate Commutated Thyristor) has been introduced as a much advanced GTO to the industry of high power and medium voltage application in late 90s [6], [7].…”

Section: Introductionmentioning

confidence: 99%

A study on high current rectifier systems with mitigated time-varying magnetic field generation at ac input and dc output busbars

Suh

Kim

2011

2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper investigates occupational exposure to time-varying magnetic field generation in high power rectifier systems. Two different kinds of high power rectifier systems rated for 25kA are modeled and analyzed. The performance is compared and evaluated on the basis of exposure guidelines from ICNIRP(International Commission on Non-Ionizing Radiation Protection). In order to focus on the qualitative effect of rectifier operation, the mechanical structure of current carrying conductors is simplified as infinite long bus-bar model and low frequency harmonic contents up to 65kHz are considered. Thyristor rectifier generates a significant amount of low frequency magnetic field harmonic contents both at ac and dc side of rectifier infringing the limit from ICNIRP. The multilevel rectifier-IGCT type has almost negligible field generation from ac input side and smaller harmonic contents in dc load side complying with ICNIRP guideline. This remarkable advantage of multilevel rectifier-IGCT type can lead to very simple site layout design for installation and costeffective compliance to guideline of occupational exposure against magnetic field.

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“…These problems include reduced productivity or process equipment life, interference with process instrumentation, electromagnetic coupling with nearby structures resulting in heating of the structures and increased losses, and audible noise emitted from bus bars, etc. [5]. In many efforts to solve these problems, the development of high current rated turn-off switching devices and its optimal application to high current rectifiers are necessary.…”

mentioning

confidence: 99%

“…This large ripple current of high frequency gives a rise to many serious problems such as heating of bus and nearby structures, audible noise, electro-magnetic interference with process instrumentations, more electro-magnetic field occupational exposure, etc. [5].…”

mentioning

confidence: 99%

Application of IGCT in High Power Rectifiers

Suh

Steimer

2008

2008 IEEE Industry Applications Society Annual Meeting

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This paper investigates the possibility of applying IGCT(Integrated Gate Commutated Thyristor) into high current high power rectifier systems. The optimal power converter topology that fully utilizes the functionality of IGCT is proposed. The proposed power converter consists of a front-end diode rectifier and 3-level step-down dc/dc converter. As compared to 2-level operation, half the input dc voltage and twice the effective switching frequency of 3-level operation can provide a wider operation range of continuous conduction mode resulting in a higher average output current of less ripple size than 2-level case. A laboratory proto-type of 5kA, 3.1MW rectifier has been simulated and tested to confirm the feasibility of IGCT in the proposed power converter topology. The proposed solution generates a relatively smooth output dc current with less contents of high frequency harmonics, thereby avoiding the high frequency harmonic related problems found in IGBT based high current rectifiers. IGCT would play a significant role to improve the cost-effective performance and reliability in low and medium ranged high current high power rectifier systems.

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Cause, effects, and mitigation of ripple from rectifiers

Cited by 10 publications

References 1 publication

Ripple Control in AC to DC Converter

Ripple Control in AC to DC Converter

A study on high current rectifier systems with mitigated time-varying magnetic field generation at ac input and dc output busbars

Application of IGCT in High Power Rectifiers

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