The Diode-Assisted Gate-Commutated Thyristor—Operation, Design, and Testing

Qawasmi, Ala; Teichrib, Jakob; Doncker, Rik W. De

doi:10.1109/jestpe.2020.2981536

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…The diode-assisted gate commutated thyristor (DAGCT) concept was proposed by Dr. Rik W. De Doncker [23] [24], which is similar to the IGCT, by replacing the pre-charged capacitor bank in the IGCT with multiple diodes connected in series forming a diode-stack in the GCT cathode terminal, as shown in Fig. 22 (a).…”

Section: Dagct Based Sscbsmentioning

confidence: 99%

“…All other electrical and mechanical components are connected by means of mechanical pressure. [23] At 550 A conduction current, the diode-stack contributes to ~ 65% conduction losses of the DAGCT, with ~ 4.1 V forward voltage drop [23]. However, to achieve higher interruption current, higher diode forward voltage drop is required.…”

Section: Dagct Based Sscbsmentioning

confidence: 99%

“…The DAGCT has the advantages of easy ON/OFF control through gate signals and fast current interruption speed. As shown in Table IV, Ref [23] developed a 2.8 kV DAGCT prototype which successfully demonstrated 550 A current interruption within 4 µs. However, to interrupt higher current, higher diode forward voltage drop is required to force the current to commutate from the GCT cathode to the gate.…”

Section: Mos-controlled Thyristor (Mct) Based Sscbsmentioning

confidence: 99%

“…Only the MOSFETs at the gate terminal (GFETs in the pictures) are soldered on the PCB. All other electrical and mechanical components are connected by means of mechanical pressure [23].…”

mentioning

confidence: 99%

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A Review of Thyristor Based DC Solid-State Circuit Breakers

Song¹,

Cairoli²,

Du³

et al. 2021

IEEE Open J. Power Electron.

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Characterized by ultra-fast and arc-free fault clearing, solid state circuit breakers (SSCBs) are getting increasing popularity with the latest development of advanced power semiconductor devices, like the silicon carbide (SiC) MOSFETs. On the other hand, the mature and cost-effective thyristor technology exhibits the beneficial features of low conduction losses, high surge current capability, bidirectional voltage blocking capability, etc., making it a very attractive candidate for SSCB development. However, the conventional thyristors (silicon controlled rectifiers) have no current turn-off capability and need some auxiliary circuits (e.g. LC resonant circuit) or special topology (e.g. Z-source breakers) to be applied in SSCBs. Meanwhile, some active turn-off thyristors (like integrated gate-commutated thyristors, emitter turn-off thyristors, etc.) are specially modified to have current turn off capability, and better suitable for SSCBs. This paper reviews and studies the SSCBs based on the conventional or active turn-off thyristors. The design challenges and performance comparison of SSCBs with different thyristor technologies are also discussed.

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Section: Dagct Based Sscbsmentioning

confidence: 99%

Section: Dagct Based Sscbsmentioning

confidence: 99%

Section: Mos-controlled Thyristor (Mct) Based Sscbsmentioning

confidence: 99%

“…Only the MOSFETs at the gate terminal (GFETs in the pictures) are soldered on the PCB. All other electrical and mechanical components are connected by means of mechanical pressure [23].…”

mentioning

confidence: 99%

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A Review of Thyristor Based DC Solid-State Circuit Breakers

Song¹,

Cairoli²,

Du³

et al. 2021

IEEE Open J. Power Electron.

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“…On the other hand, modified thyristor structures (GTO/GCT, IGCT, and ETO) integrated with an active turn-off feature have been developed and thoroughly investigated [19][20][21][22][23][24][25]. These active-turn-off thyristors have been extensively studied [26][27][28][29][30][31][32]. The regenerative braking capability of SSCBs was presented in [33]; however, the system complexity and cost can be higher, and the current breaking time is approximately 40 ms.…”

Section: Introductionmentioning

confidence: 99%

Resonant Network-Based MVDC Circuit Breaker Topologies With Fast Current Breaking Capability

Sayed

Krishnamoorthy

2023

IEEE Access

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This paper presents two improved circuit breaker (CB) topologies based on resonant networks for medium voltage DC (MVDC) applications, such as shipboard power distribution and subsea oil and gas production. The topologies feature simple LC resonant networks that efficiently suppress fault current in just a few tens of microseconds, making them suitable for integration with existing solid-state or hybrid DC CB. Moreover, they also help to minimize the CB energy and reduce (if not eliminate) the requirement for protection devices like surge arresters during fault events. The proposed topologies are first tested using Typhoon Hardware-in-the-Loop (HiL) simulations at 1.2 MW (6 kV, 200 A) power levels and thyristor-based solid-state circuit breakers (SSCB). Then, scaled-down laboratory prototypes, also based on thyristor-based SSCB, are experimentally validated. The results show that both topologies quickly bring the current of the CB's main switch to 0 A. The main circuit pathway requires only a small inductor and switch, resulting in a steady-state efficiency of >99.9%. The resonant network-based design allows for a fast response time of less than 50 µs using a simple and low-cost auxiliary circuit, eliminating the need for complex charging circuitry and protection devices typically used to suppress voltage surges during faults.

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