Balancing Algorithm for a Self-Powered High-Voltage Switch Using Series-Connected IGBTs for HVDC Applications

Chivite-Zabalza, Javier; Trainer, D.R.; Nicholls, J.; Davidson, Colin

doi:10.1109/tpel.2018.2889375

Cited by 31 publications

(11 citation statements)

References 9 publications

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“…The phase-neutral LW voltages are related to the phaseneutral RLW voltages by (19). Given that LW voltages are defined by (20), the RLW voltages are then defined by (21).…”

Section: Appendix Relationship Between Lw and Rlw Voltagesmentioning

confidence: 99%

“…In addition to each arm comprising a valve (formed by FB SMs) and an inductor, there is also a series-connection of self-commutated semiconductor devices with anti-parallel diodes, termed a Director Switch (DS). A strategy is required to balance the voltages across the series-connected devices within a DS [20]. The two DSs in each converter phase-leg alternate conduction of the AC side current so that this current is rectified on the DC side.…”

Section: Introductionmentioning

confidence: 99%

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The Alternate Arm Converter “Extended-Overlap” Mode: AC Faults

Farr

Feldman

Clare

et al. 2021

IEEE Trans. Power Electron.

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This paper presents AC fault ride-through strategies for the "extended-overlap" operating mode of the Alternate Arm Converter (AAC), which is a type of modular multilevel Voltage Source Converter (VSC) that has been proposed for HVDC transmission applications. The AAC offers several benefits over the Half-Bridge (HB) Modular Multilevel Converter (MMC), such as requiring fewer Sub-Modules (SMs) with a smaller capacitance and providing DC fault ride-through capability. Novel symmetrical and asymmetrical AC fault ride-through strategies are described and these strategies are experimentally validated by using a Small Scale Prototype (SSP).

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“…The phase-neutral LW voltages are related to the phaseneutral RLW voltages by (19). Given that LW voltages are defined by (20), the RLW voltages are then defined by (21).…”

Section: Appendix Relationship Between Lw and Rlw Voltagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Alternate Arm Converter “Extended-Overlap” Mode: AC Faults

Farr

Feldman

Clare

et al. 2021

IEEE Trans. Power Electron.

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show abstract

“…where N1,2 and N3,4 represent the required number of seriesconnected IGBTs in Sj1 and Sj2, and Sj3 and Sj4, respectively, UB is the rated blocking voltage of each single IGBT, and λd is the voltage derating factor in terms of series connection, which ensures voltage margin for a single IGBT [33]. In practice, λd is selected for example 56% in the ABB design [34] and 57% in the GE design [35]. It is noteworthy that the ZVZCS of the IGBT branches can significantly ease the technical difficulty of series connection of IGBTs.…”

Section: Series-connected Igbtsmentioning

confidence: 99%

A Monopolar Symmetrical Hybrid Cascaded DC/DC Converter for HVDC Interconnections

Zhang

Cheng

et al. 2021

IEEE Trans. Power Electron.

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With the rapid development of voltage source converter (VSC) based high voltage direct current (HVDC) transmission, it is an irresistible trend that HVDC grid will come into being. High-voltage and high-power DC/DC converters will serve as DC transformers in HVDC grid to interconnect DC lines with different voltage ratings. This paper proposes a monopolar symmetrical DC/DC converter which is composed of cascaded half-bridge sub-modules (SMs) and series-connected IGBTs. This hybrid topology features low capital costs, high efficiency, small footprint, and bidirectional power transfer capability. Operation principle, parameter design, and the control strategies of this topology are introduced. A 480MW, ±500kV/±160kV monopolar symmetrical DC/DC converter is simulated to verify its performance and evaluate the efficiency. In addition, a downscaled prototype rated at 2.4kW, ±300V/±100V has been built and tested. Experimental results further validate the effectiveness of the proposed DC/DC converter.

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“…The converter arms consist in a serial connection of a stack of FB-SMs and a Director Switch (DS). The DS P. Vermeersch, F. Gruson is composed of several fully controllable power devices [9] used to reduce arm conduction periods in a such way that the upper arm modulates the positive part of the AC voltage while the lower arm the negative part. These operations, allows the AAC to require less SMs and energy storage than the HB-MMC [10] while having the DC fault blocking capability and better efficiency than the FB-MMC [7], [11].…”

Section: Introductionmentioning

confidence: 99%

Full Energy Management of EO-AAC: Toward a Dynamic Equivalence With MMC

Vermeersch

Gruson

Merlin

et al. 2021

IEEE Trans. Power Delivery

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Energy management in modular type converters constitutes a key aspect of their operational stability. This paper introduces a full energy management structure for the Extended Overlap-Alternate Arm Converter (EO-AAC) ensuring both equal energy distribution across all six stacks and the maintaining of ripple-free DC current during steady state. The performance of the control structure against active power step events is validated by detailed simulations using EMTP-RV software. Moreover, the full energy management allows the EO-AAC to have an equivalent controllability to Modular Multilevel Converter (MMC) through only two conducting stacks in overlap mode ensuring the power balance. From this observation, it is demonstrated that the use of control strategy like the virtual capacitor to support HVDC system, originally designed for MMC, is possible.Gathering all these controllers leads to a general conclusion which is the dynamic equivalence between EO-AAC and MMC.

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Balancing Algorithm for a Self-Powered High-Voltage Switch Using Series-Connected IGBTs for HVDC Applications

Cited by 31 publications

References 9 publications

The Alternate Arm Converter “Extended-Overlap” Mode: AC Faults

The Alternate Arm Converter “Extended-Overlap” Mode: AC Faults

A Monopolar Symmetrical Hybrid Cascaded DC/DC Converter for HVDC Interconnections

Full Energy Management of EO-AAC: Toward a Dynamic Equivalence With MMC

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