Modeling and Analysis of the Dead-Time Effects in Parallel PWM Two-Level Three-Phase Voltage-Source Inverters

Itkonen, Toni; Luukko, J.; Sankala, Arto; Laakkonen, Tommi; Pollanen, R.

doi:10.1109/tpel.2009.2033064

Cited by 72 publications

(22 citation statements)

References 15 publications

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“…Formula (13) show that, I s does not contain I 12 or I 21 . In other words, the harmonic circulating currents have no influence on the parallel system.…”

Section: B Formation Mechanism and Distribution Characteristics Of Tmentioning

confidence: 98%

“…The main cause of harmonic circulating currents is the generation of some harmonics via detection and control errors between the power modules, which do not have the characteristics of a controlled current source. For example, the dead-time differences of power switches [12], [13] and the carrier phase shifting of the SPWM between each inverter module cause harmonic circulating currents [14], [15].…”

Section: Introductionmentioning

confidence: 99%

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A Study of the SPWM High-Frequency Harmonic Circulating Currents in Modular Inverters

Xu¹,

Ji²

2016

Journal of Power Electronics

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Due to detection and control errors, some high-frequency harmonics with voltage-source characteristics cause circulating currents in modular inverters. Moreover, the circulating currents are usually affected by the output filters (OF) of each module due to their filter and resonance properties. The interaction among the circulating currents in the modules increase the power loss and reduce system stability and control precision. Therefore, this paper reports the results of a study on the SPWM high-frequency harmonics circulating currents for a double-module VSI. In the paper, an analysis of the circulating-current circuits is briefly described. Next, a mathematic model of the single-module output voltage based on the carrier frequency of SPWM is built. On this basis, through mathematic modeling of high-frequency harmonic circulating currents, the formation mechanism and distribution characteristics of circular currents and their influences are studied in detail. Finally, the influences of the OF on the circulating currents are studied by mainly taking an LC-type filter as an example. A theoretical analysis and experimental results demonstrate some important characteristics. First, the carrier phase shifting of the SPWM for each module is the major cause of the SPWM harmonic circulating currents, and the circulating currents are in an odd distribution around n-times the carrier frequency nω s , where n = 1, 2, 3, …. Second, the harmonic circular currents do not flow into the parallel system. Third, the OF can effectively suppress the non-circulating part of the high-frequency harmonic currents but is ineffective for the circulation part, and actually reduces system stability.

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“…Formula (13) show that, I s does not contain I 12 or I 21 . In other words, the harmonic circulating currents have no influence on the parallel system.…”

Section: B Formation Mechanism and Distribution Characteristics Of Tmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

A Study of the SPWM High-Frequency Harmonic Circulating Currents in Modular Inverters

Xu¹,

Ji²

2016

Journal of Power Electronics

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“…Since the DC-links of inverters are isolated, there is no zero-sequence circulating current in the inverters. However, due to the component tolerance, and the parameters drifts of sensors, the asynchronous switching patterns of the inverters are inevitably generated [14]. As a consequence, the path for the non-zero-sequence circulating current, which is also termed as the 'cross current' in [15], is formed whenever the inverters are in the different switching state.…”

Section: A Definition Of Circulating Currentmentioning

confidence: 99%

An improved design of virtual output impedance loop for droop-controlled parallel three-phase voltage source inverters

Wang

Blaabjerg

Chen

2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-The virtual output impedance loop is known as an effective way to enhance the load sharing stability and quality of droop-controlled parallel inverters. This paper proposes an improved design of virtual output impedance loop for parallel three-phase voltage source inverters. In the approach, a virtual output impedance loop based on the decomposition of inverter output current is developed, where the positive-and negativesequence virtual impedances are synthesized separately. Thus, the negative-sequence circulating current among the parallel inverters can be minimized by using a large negative-sequence virtual resistance even in the case of feeding a balanced threephase load. Furthermore, to adapt to the variety of unbalanced loads, a dynamically-tuned negative-sequence resistance loop is designed, such that a good compromise between the quality of inverter output voltage and the performance of load sharing can be obtained. Finally, laboratory test results of two parallel three-phase voltage source inverters are shown to confirm the validity of the proposed method.

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“…Active techniques for suppression of the DC component of the magnetization current [42][43][44] modify the control pulses to IGBTs in order to minimize the negative effects of nonlinearities in the control of semiconductor switches, or alter the current reference waveform of the inverter, in case that DC component of the magnetization current, or the current distortion due to core saturation is detected.…”

Section: Passive Mitigation Techniques Includementioning

confidence: 99%

Active Suppression of Low-frequency Interference Currents by Implementation of the High-performance Control System for the Grid-interfaced Converters

Težak¹,

Bahun²,

Petrović

2012

Automatika

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Original scientific paperOperation of traction drive and auxiliary power supply converters installed onboard modern vehicles causes increased content of line harmonics and interharmonic components in the line current. Passive techniques for filtration of low frequency interference line currents appeared to be insufficient, but are combined with active mitigation techniques. The paper describes and suggests active suppression methods based on proper design of the grid interface of the power converter and its corresponding control system. Interference currents, including those induced by the operation of onboard power converters can significantly influence the correct operation of telecommunication, train control systems and other railway signaling infrastructure along the tracks, having direct impact to the safety of the railway transport. Therefore, suppression of low-frequency interference line currents requires careful implementation of active/passive methods. For purpose of quality evaluation of performances of the grid interface of the traction drive converters and its corresponding control system in particular, a series of tests for assessment of the line current frequency spectrum, resulting from the operation of the converter in typical exploitation conditions, were performed. Tests were performed in laboratory conditions and on the vehicle, with satisfactory results.Key words: Active filter, Control system design, Interference currents suppression, Line-side converters for railway applicationsAktivno potiskivanje nisko-frekvencijskih struja smetnji u pojnoj mreži djelovanjem na upravljačko-regulacijsku strukturu mrežnog sučelja pretvarača. Široka primjena pretvarača glavnih i pomoćnih pogona, na suvremenim željezničkim vozilima, uzrokuje pojavu povećanog sadržaja neželjenih viših harmonika te meduharmonika u strujama pojne mreže. Pasivne tehnike filtriranja nisko-frekvencijskih struja smetnji pokazale su se nedostatnim, te se kombiniraju s aktivnim tehnikama. U radu su predložene aktivne metode potiskivanja zasnovane na odgovarajućem dizajnu mrežnog sučelja pretvarača glavnih i pomoćnih pogona i pripadne upravljačko-regulacijske strukture. Struje smetnji, pa tako i one nastale kao posljedica rada pretvarača glavnih i pomoćnih pogona instaliranih na vozilo, uzrokuju elektromagnetske smetnje koje mogu značajno utjecati na ispravan rad telekomunikacijske (TK) i signalno-sigurnosne (SS) infrastrukture uz prugu, a samim tim i na sigurnost željezničkog prometa. Stoga se potiskivanju nisko-frekvencijskih struja smetnji u pojnoj mreži treba pristupiti s posebnom pozornošću, koristeći pasivne/aktivne mjere. U svrhu ocjene kvalitete postignutih radnih karakteristika mrežnog sučelja pretvarača za napajanje glavnog pogona, u smislu potiskivanja struja smetnji, proveden ječitav niz pokusa mjerenja spektralnog sastava struja pojne mreže pod djelovanjem pretvarača u tipičnim uvjetima eksploatacije. Ispitivanja su provedena u laboratorijskim uvjetima, kao i na vozilu, uz zadovoljavajuće rezultate.Ključne riječi: aktivni...

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Modeling and Analysis of the Dead-Time Effects in Parallel PWM Two-Level Three-Phase Voltage-Source Inverters

Cited by 72 publications

References 15 publications

A Study of the SPWM High-Frequency Harmonic Circulating Currents in Modular Inverters

A Study of the SPWM High-Frequency Harmonic Circulating Currents in Modular Inverters

An improved design of virtual output impedance loop for droop-controlled parallel three-phase voltage source inverters

Active Suppression of Low-frequency Interference Currents by Implementation of the High-performance Control System for the Grid-interfaced Converters

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