Auxiliary power supply for medium-voltage modular multilevel converters

Peftitsis, Dimosthenis; Antivachis, Michael; Biela, J.

doi:10.1109/epe.2015.7309388

Cited by 29 publications

(13 citation statements)

References 5 publications

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“…The proposed one transformer per output isolation approach is already verified in the literature [17]. Although similar, this alternative uses a LLC resonant circuit topology and focus to address the existing high-voltage insulation difficulties.…”

Section: Introductionmentioning

confidence: 92%

Insulated Modular Auxiliary Power Source Concept with Multiple Outputs

Lambert¹,

Seidel²,

Fiorio³

et al. 2019

Eletrônica de Potência

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This paper presents an insulated auxiliary power source with multiple outputs based on a two-stage structure, where the first-stage operates as a controlled current source and the second-stage as an active rectifier. The second-stage is replicated for each load, where the output voltage is independently controlled by a hysteresis band controller integrated to the auxiliary power source's circuit. Insulation between the multiple stages is achieved by a medium-frequency transformer for each output. The main aim of this auxiliary power supply is to feed modular multilevel converters in laboratory applications that run at the lower range of medium-voltage dc. Theoretical analysis of the auxiliary power supply is presented and verified experimentally for the converter's two main modes of operation.

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Section: Introductionmentioning

confidence: 92%

Insulated Modular Auxiliary Power Source Concept with Multiple Outputs

Lambert¹,

Seidel²,

Fiorio³

et al. 2019

Eletrônica de Potência

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“…APSs with 2.2 kV input voltage are used in [21], [22]. APS with inductive power transfer are proposed in [23]- [24] for grid integration of a MV modular multilevel converter. This approach enormously simplifies start-up as full control of cells is possible at the instant of SST connection to the grid.…”

Section: A Apss Fed From Ac Portsmentioning

confidence: 99%

Energization and Start-Up of CHB-Based Modular Three-Stage Solid-State Transformers

Saeed

Cuartas

Rodríguez

et al. 2018

IEEE Trans. on Ind. Applicat.

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This paper discusses the energization and start-up process of modular three-stage Solid State Transformers (SSTs) based on a cascaded H-bridge (CHB) topology. A key element of the SST is the Auxiliary Power Supply (APS) feeding the auxiliary circuitry. Redundancy and simpler implementation can be achieved by powering the APSs from the cells DC-link capacitors, but at the expense of a more challenging start-up process of the SST. The first steps of this process must be performed before APSs are operative. This can result in undesired transient events (inrush currents, voltage sags in the capacitors voltages, etc.) which could prevent proper start-up of the SST or even jeopardize the power devices or other elements. A simple strategy for the energization and start-up of SSTs using this APSs structure is proposed. The method is valid both for grid-forming and grid-feeding operation of the SST, regardless of the energization port and without the addition of any extra circuitry. Simulation and experimental results are provided.

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“…8 shows the state-of-the-art isolation power supplies. One of the most common solutions is to utilize voltage-based transformers, which are shown in [5], [6], and [7]. A large magnetic core is used to isolate the primary and secondary windings keeping them at sufficient distance, which results in a heavy and bulky circuit.…”

Section: Reviews Of Gate Driver Power Supply Hv Isolation Designmentioning

confidence: 99%

Current-Transformer Based Gate-Drive Power Supply with Reinforced Isolation

Wang

Burgos

et al. 2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

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At t0, the half-bridge high-side (HS) switch is turned on. During this mode, the input of the resonant tank is connected to the DC input. The resonant tank outputs a current-source to the transformer, which outputs a positive current to the rectifier. 2) Mode 2(Dead-time, t1 < t < t2) At t1, the HS switch is turned off. The output capacitors of the HS-switch Coss_H start to be charged while that of the low-side (LS) switch Coss_L is discharged for part of the dead-time duration. This mode ends when the capacitances are fully charged or discharged.

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Auxiliary power supply for medium-voltage modular multilevel converters

Cited by 29 publications

References 5 publications

Insulated Modular Auxiliary Power Source Concept with Multiple Outputs

Insulated Modular Auxiliary Power Source Concept with Multiple Outputs

Energization and Start-Up of CHB-Based Modular Three-Stage Solid-State Transformers

Current-Transformer Based Gate-Drive Power Supply with Reinforced Isolation

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