Multiobjective Optimization of Traction Substation Converter Characteristic and Train Timetable in Subway Systems

Du, Guifu; Zhu, Chengqian; Jiang, Xingxing; Li, Qiaoyue; Huang, Weiguo; Shi, Jie; Zhu, Zhongkui

doi:10.1109/tte.2022.3216448

Cited by 5 publications

(1 citation statement)

References 29 publications

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“…Considering the flow paths of stray current and the structures of the metro system and urban power grid shown in Figure 1, the DC resistance model for calculating the neutral DCs of transformers is established as shown in Figure 4. The metro system and urban power system are equivalent to the DC resistance network model considering the DC resistance parameters of devices [2,3,19]. In the urban power grid, the grounding grids of substations are connected by neutral-point-grounded transformers and grounding systems.…”

Section: Modeling Of Bd Installationmentioning

confidence: 99%

Mitigation Strategy of Neutral-Point DC for Transformer Caused by Metro Stray Currents

Wang,

Lin,

et al. 2024

Electronics

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Metro stray currents flowing into neutral-point-grounded transformers can cause serious direct current (DC) bias. Affected by both metro train and urban power grid operations, transformer neutral-point DC caused by metro stray current is complex, dynamic, and time-varying, which changes the DC bias risk level of transformers. Thus, just installing blocking devices (BDs) at transformer neutral points with high instantaneous DC may make it difficult to comprehensively mitigate DC bias and lead to increased BD installation. To solve this, through optimizing BD installation placements, a mitigation method for transformer DC bias is proposed. In the proposed method, the DC bias risk level and BD installation number are included in the constraint and objective functions. To evaluate the risk level of transformer DC bias, four indicators are proposed considering the distribution characteristics of neutral DC. To optimize the BD installation placements, the effects of both the metro train dynamic operation and the operation topology of the urban power grid on neutral DCs are considered. The Monte Carlo method is used to sample the train operation conditions and a relation matrix among transformers is established. Applying the method to a certain power system, the result of BD installation placements shows that the transformers supplying the metro system must have BDs installed at their neutral points.

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Section: Modeling Of Bd Installationmentioning

confidence: 99%