Research on Topology of Medium Voltage Hybrid DC Circuit Breaker Based on IGCT

Zhao, Xiaomin; Wenkui, Liu; Li, Xiao; Pang, Sumin; Wang, Mingfei; Zhang, Hang

doi:10.1109/hvdc50696.2020.9292772

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…The main circuit branch of CCCB-SDCCB consists of R-SFCL and an ultrafast disconnector switch (UDS), and the current commutation circuit is structured by IGCTs, thyristors, capacitors, and metal-oxide varistors (MOVs). As compared with the IGCT-HDCCB which requires pre-charging the capacitor before each short-circuit fault 28 , 29 , the bridge circuit composed of four thyristors can flexibly adjust the connection direction of the capacitor without setting up a separate pre-charging process. It fully utilizes the residual capacitor voltage from the previous fault stage to provide reverse shutdown voltage for the IGCTs in the next circuit breaking action, thereby ensuring the high current breaking capacity and low cost of the circuit breaker.…”

Section: Introductionmentioning

confidence: 99%

A novel controllable capacitor commutation based superconducting hybrid direct current breaker

Xu,

Junaid,

et al. 2024

Sci Rep

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Featuring low power loss and high reliability, voltage source converter medium voltage direct current (VSC-MVDC) systems have been widely employed for grid-tied renewable energy applications. To maintain high operational safety, circuit breakers are needed to isolate faulted powerlines by comprehensively considering response speed and installation cost. Research efforts have been put to realizing DC fault isolation by coordinating resistive type superconducting fault current limiter (R-SFCL) and integrated-gate-commutated-thyristor (IGCT) based hybrid DC circuit breaker. In this paper, a controllable current commutation based superconducting DC circuit breaker (CCCB-SDCCB) is proposed. By integrating R-SFCL with IGCT based hybrid DC circuit breakers, the current interrupting capacity can be greatly enlarged with the advantage of low cost and fast speed, and hence the overall cost for suppress large fault currents can be greatly reduced for MVDC systems. In addition, a new current injection circuit branch using H-bridge structure is designed to recycle the residual capacitor voltage from the previous fault stage to trigger the IGCTs without the capacitor pre-charging process. Simulation results show that the fault current can be successfully suppressed from 24.2 to 2.1 kA and fully interrupted within 4.11 ms by the proposed CCCB-SDCCB.

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Section: Introductionmentioning

confidence: 99%

A novel controllable capacitor commutation based superconducting hybrid direct current breaker

Xu,

Junaid,

et al. 2024

Sci Rep

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“…DC protections for large-power installations are implemented as assisted circuit breakers (called "hybrid") [11] or fully static semiconductor-based devices [10], driven by detection algorithms. Various techniques have been proposed and applied to DC railways [3,59] and distributed generation DC grids [60,61], exploiting various methods and monitored grid quantities: (i) methods based on autonomous signal injection and impedance estimation [3,59] are rather immune to distortion, as ideally, the applied intensity may increase until a satisfactory operation is achieved; (ii) the criterion proposed for the DC side of a wind power system in [60] is based on DC ripple, that in normal conditions must be low (0.2%) for the method to work; (iii) the robust technique correlating internal current waveforms to separate faults of internal and external origin [61] was tested against uncorrelated Gaussian noise, but not with signal distortion, which is highly correlated as well.…”

mentioning

confidence: 99%

Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids

Mariscotti

2021

Energies

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This work addresses the problem of power quality (PQ) metrics (or indexes) suitable for DC grids, encompassing low and medium voltage applications, including electric transports, all-electric ships and aircrafts, electric vehicles, distributed generation and microgrids, modern data centers, etc. The two main pillars on which such PQ indexes are discussed and built are: (i) the physical justification, so the electric phenomena affecting DC grids and components (PV panels, fuel cells, capacitors, batteries, etc.), causing, e.g., stress of materials, aging, distortion, grid instability; and (ii) the existing standardization framework, pointing out desirable coverage and extension, similarity with AC grids standards, but also inconsistencies. For the first point, each phenomenon is discussed with quantitative conclusions on relevant thresholds: in many cases some percentage of distortion (ripple) is acceptable (stress on capacitors and storage, impact on fuel cells, and PV panels), whereas in other cases, much higher levels may be tolerated (interference to protection and monitoring devices). Standards are reviewed for indications not only of low-order harmonics and voltage fluctuations typical of old DC grid schemes, but also for high-frequency noise, including thus supraharmonics and common-mode disturbance, and filling the gap with the electromagnetic compatibility domain. However, phenomena typical of EMC and electrical safety (such as various types of overvoltages and fast transients) are excluded. Suitable PQ indexes are then reviewed, suggesting integrations and modifications, to cover the relevant phenomena and technological progress, and to better follow the normative exigencies: ripple is considered in time and frequency domain, in particular with a band limited implementation; for transients and pulsed loads, more traditional indexes based on area, energy, and half duration are confronted with indexes evaluating the power trajectory and its derivative.

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Review of Key Technologies in Modeling and Control of DC Transmission Systems Based on IGCT

Yao,

Zhang,

et al. 2024

Electronics

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The integrated gate-commutated thyristor (IGCT) has the advantages of high voltage, high current, high reliability, and low manufacturing costs and has the potential to replace thyristor devices in the field of high-voltage direct current (HVDC) transmission. Over time, the development and manufacture of IGCT devices, drivers, and valve bodies have gradually matured, but the modeling and control technology of HVDC systems based on IGCT needs further research. This review aims to discuss the research status of key technologies of HVDC system modeling and control based on the IGCT in recent years, including the development of HVDC systems and the application potential of the IGCT, the efficient simulation and modeling technology of the IGCT HVDC system, and the key problems of HVDC system control technology based on the IGCT. At the same time, according to the author’s point of view, the existing problems and difficulties are extracted, and the next development ideas are clarified.

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Research on Topology of Medium Voltage Hybrid DC Circuit Breaker Based on IGCT

Cited by 3 publications

References 5 publications

A novel controllable capacitor commutation based superconducting hybrid direct current breaker

A novel controllable capacitor commutation based superconducting hybrid direct current breaker

Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids

Review of Key Technologies in Modeling and Control of DC Transmission Systems Based on IGCT

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