Controlled Transition Full-Bridge Hybrid Multilevel Converter With Chain-Links of Full-Bridge Cells

Adam, Grain Philip; Holliday, Derrick; Williams, B.W.

doi:10.1109/tpel.2016.2523598

Cited by 27 publications

(11 citation statements)

References 29 publications

(64 reference statements)

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“…In these cases, the FB-CL may operate longer period for better voltage wave quality but with limited sacrifice of converter efficiency. The triplen harmonic injection could be used to further extend the modulation range of the AFC converter [8], [11]. An alternative option is to use the selective harmonic elimination (SHE).…”

Section: Performance Evaluation and Discussionmentioning

confidence: 99%

“…2 will apply to the FB-CL Q 1b and Q 2a . The voltage balancing of FB-CL submodules can be realized using its redundant switching states to charge or discharge the selected capacitors based on the sorting results [8].…”

Section: )mentioning

confidence: 99%

“…Also, to ensure reliable turn-off of the thyristor, the reverse bias time T C should be larger than device turn-off time T q ; and the current falling time T f must be shorter than T C − T q . Therefore, the constraints for calculating L can be summarized as in (8)…”

Section: Converter Dimensioning Guidelinesmentioning

confidence: 99%

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Active-Forced-Commutated Bridge Using Hybrid Devices for High Efficiency Voltage Source Converters

Finney

Holliday

2017

IEEE Trans. Power Electron.

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In high-power converters, the on-state characteristics of semiconductor devices dictate its efficiency performance even if the optimized topologies are adopted. This letter proposes an active-forced-commutated (AFC) bridge that employs the hybrid power devices of thyristor and insulated-gate bipolar transistor (IGBT) to operate as a voltage source converter or the building blocks of complex multistage high-voltage high-power converters. In this scheme, the thyristors are placed in the main power path that conducts for most of the fundamental period to lower the on-state losses; while the IGBT-based full-bridge (FB) chain-link is used for controlled (soft) transition and forced commutation of the main thyristor bridge, operating in short period. This stepped transition voltage also leads to minimized dv/dt exerted on the interfacing transformer. To coordinate the operation of these two parts, the FB stack is designed to operate in a concave polygon stepped transition mode for the ordered turn-on and turn-off of thyristors according to different categories of commutation events. Detailed commutation analysis for the AFC-bridge is provided in this letter; also, high-level discussions and simulation results are presented to demonstrate its potential technical merits.Index Terms-Active forced commutation (AFC), controlled transition, high efficiency, hybrid device, insulated-gate bipolar transistor (IGBT), thyristor, voltage source converter (VSC).

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Section: Performance Evaluation and Discussionmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

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Active-Forced-Commutated Bridge Using Hybrid Devices for High Efficiency Voltage Source Converters

Finney

Holliday

2017

IEEE Trans. Power Electron.

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“…When the output voltage of FB-CL is higher (lower) than +½V SM (-½V SM ), the upper (lower) thyristor string can be reliably turned-off provided its gate signal is removed. The energy balancing of the FB-CL module capacitors inside the proposed AFC cell can be realized by the bipolar voltage generation capability of each FB module in coordination with the voltage sorting results and the load current polarity [17][18][19]. MMC using the proposed AFC cells is shown in Fig.…”

Section: Basic Working Laws Of the Afc Cellmentioning

confidence: 99%

Thyristor based modular multilevel converter with active full-bridge chain-link for forced commutation

Finney

Holliday

2016

2016 IEEE 17th Workshop on Control and Modeling for Power Electronics (COMPEL)

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“…The authors in [29] presented a full-bridge version of the CTB converter, where the full-bridge chain link of each phase must be rated for the full dc link voltage instead of half as in original version of the CTB converter. Also, the use of common dc inductor per three-phase in the dc link necessitates incorporation of an active device to circulate the stored energy in the dc link inductor in a zero voltage when the conduction path between converter and dc side is interrupted.…”

Section: Introductionmentioning

confidence: 99%

Controlled transition bridge converter: Operating principle, control and application in HVDC transmission systems

Adam

Alsokhiry

Abdelsalam

et al. 2018

Electric Power Systems Research

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this paper employs an amplitude modulation with sinusoidal plus third harmonic injection instead of trapezoidal modulation to operate a controlled transition bridge (CTB) converter as ac/dc and dc/ac converter terminals. With such an operation, the CTB converter may require small ac filters; thus attractive for high-voltage direct current (HVDC) transmission systems. To facilitate ac voltage control over a wide range and black-start capability, the injected 3 rd harmonic allows the cell capacitor voltages of the CTB converter to be regulated independent of the modulation index and power factor. The insertion of 3 rd harmonic into modulating signals achieves two objectives: extends the regions around voltage zeros so that the total voltage unbalanced can be distributed between the cell capacitors, thereby exploiting the bipolar capability of the full-bridge cells in each limb; and to ensure that each limb can be clamped to the positive and negative dc rails every half fundamental period independent of the modulation index to allow recharge of the cell capacitors from the active dc link. The suitability of the CTB converter for HVDC type applications is demonstrated using a two-terminal HVDC link that employs a 21-cell CTB converter, considering normal operation and ac faults.

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Controlled Transition Full-Bridge Hybrid Multilevel Converter With Chain-Links of Full-Bridge Cells

Cited by 27 publications

References 29 publications

Active-Forced-Commutated Bridge Using Hybrid Devices for High Efficiency Voltage Source Converters

Active-Forced-Commutated Bridge Using Hybrid Devices for High Efficiency Voltage Source Converters

Thyristor based modular multilevel converter with active full-bridge chain-link for forced commutation

Controlled transition bridge converter: Operating principle, control and application in HVDC transmission systems

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