Comprehensive Control of Reflux Safety Parameters Based on Flexible Grounding Scheme in DC Railway Electrification System

Zheng, Zixuan; Du, Guifu; Zhang, Dongliang; Huang, Weiguo; Zhang, Xiaoping; Zhu, Zhongkui

doi:10.1109/tte.2022.3154157

Cited by 5 publications

(4 citation statements)

References 30 publications

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“…Generally, the varistor's clamping voltage v clamp is typically 1.2 to 2 times the value of v s [28], which implies that the value of a should also be between 1.2 and 2. In addition, a should be smaller than nk according to (6).…”

Section: ) Selection Of Movmentioning

confidence: 99%

“…The larger the inductance is, the IEEE TRANSACTIONS ON POWER ELECTRONICS slower the ramp rate of the fault current and the greater the weight and volume of the coupled inductor would be. According to (6), the turns ratio of the coupled inductor n should be greater than a/k. The relationship between C 1 , L w2 and n is given in (11).…”

Section: ) Selection Of the Coupled Inductor And Capacitorsmentioning

confidence: 99%

“…As the voltage and current ratings increase, so does the size and cost of the coupled inductor, while the value of k decreases. According to (6), as k decreases, n must increase to ensure that the varistor operates properly. A variation in the value of k, according to (11), would impact the value of C 1 .…”

Section: ) Selection Of the Coupled Inductor And Capacitorsmentioning

confidence: 99%

“…SSCBs with power electronic components have attracted more attention than mechanical and hybrid CBs due to their faster response, lighter weight and volume, and an arc-free interruption of the fault current. SSCBs are being increasingly used in lowvoltage and medium-voltage distribution systems such as dc data centers [2], marine power systems [3], aircraft power systems [4], photovoltaic systems [5], and railway systems [6]. SSCBs deploy power semiconductor switches in series, such as insulated-gate bipolar transistors (IGBTs), metal-oxidesemiconductor field-effect transistors (MOSFETs), and silicon-controlled rectifiers (SCRs).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Low-Loss Bidirectional Solid-State Circuit Breakers With Reliable Breaking Capability for Protecting DC Microgrids

Wang,

Ugalde-Loo

et al. 2023

IEEE Trans. Power Electron.

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Silicon-controlled rectifier-based dc solid-state circuit breakers (SCR-SSCBs) have received an increased attention for their ease of control and high efficiency, but their considerable conduction losses remain a major disadvantage. This paper presents a new bidirectional SCR-SSCB topology which reduces the conduction losses by ∼50%, with the loss reduction attributed to an inductor being eliminated from the main circuit during normal operation. This is achieved by conducting current through one semiconductor switch instead of two as in conventional devices. In addition, the presented topology enhances the reliability of protection by enabling a controlled interruption of short-circuit faults, in which fault interruption is not affected by the parameters of external systems to which the circuit breaker is connected to. A second topology which reduces the size of the capacitors in the commutating circuit is also introduced. A detailed analysis of the operating principle of the two novel topologies is presented. Recommendations supported by mathematical modeling are provided for selecting the relevant components of the devices. The performance of the two topologies was verified through simulation and experimental tests.

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Section: ) Selection Of Movmentioning

confidence: 99%

Section: ) Selection Of the Coupled Inductor And Capacitorsmentioning

confidence: 99%

Section: ) Selection Of the Coupled Inductor And Capacitorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Low-Loss Bidirectional Solid-State Circuit Breakers With Reliable Breaking Capability for Protecting DC Microgrids

Wang,

Ugalde-Loo

et al. 2023

IEEE Trans. Power Electron.

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Intelligent measurement method of transition resistance of insulation fasteners in urban rail transit system based on SSA-optimized algorithm

Wang,

et al. 2024

Engineering Failure Analysis

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Dynamic Distribution of Rail Potential with Regional Insulation Alteration in Multi‐Train Urban Rail Transit

Kang,

Du,

Xia

et al. 2024

IET Electrical Systems in Transportation

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Rail potential (RP) has become a disaster for the safe operation of metro lines. In urban rail transit (URT), regional insulation degradation often occurs due to the harsh environment of the reflux conductor for traction current, leading to the complex distribution of RP. In this paper, the dynamic distribution of RP with regional insulation alteration in URT is studied. First, the distribution model of the reflux system with regional insulation alteration is established. Second, utilizing the distributed parameter element method and taking into account the constraint conditions of the concentrated parameters, a superposition calculation method of RP in the reflux system is proposed. Finally, using Guangzhou Metro as an example, the simulation of different insulation states in long and local areas of URT is carried out. Results show that the RP amplitude decreases while the stray current amplitude increases when the insulation is degraded. At the same time, when the insulation in the local area degrades, the RP at the far end increases.

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Comprehensive Control of Reflux Safety Parameters Based on Flexible Grounding Scheme in DC Railway Electrification System

Cited by 5 publications

References 30 publications

Low-Loss Bidirectional Solid-State Circuit Breakers With Reliable Breaking Capability for Protecting DC Microgrids

Low-Loss Bidirectional Solid-State Circuit Breakers With Reliable Breaking Capability for Protecting DC Microgrids

Intelligent measurement method of transition resistance of insulation fasteners in urban rail transit system based on SSA-optimized algorithm

Dynamic Distribution of Rail Potential with Regional Insulation Alteration in Multi‐Train Urban Rail Transit

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