A Novel DC Bias Suppression Method Considering the Cooperation of Multiple Devices

Ma, Shumin; Lin, Xin; Li, Zhengtian; Jin, Neng; Rong, Zirui; Pei-fu, Zhang; Xu, Haibo

doi:10.1109/access.2021.3108804

Cited by 1 publication

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The objective function is to minimize the cost function, which is affected by BD installation number [14]. When mitigating the transformer DC bias caused by GEDC, the fluctuation of neutral DCs is ignored and the maximum value is used to determine whether the transformer operates in the DC bias state [17,18]. The most significant constraint is that all neutral DC magnitudes are smaller than the threshold.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Wang,

Lin,

et al. 2024

Electronics

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

“…For example, in a certain urban power grid, the neutral DC of a 220 kV transformer for 2 days is shown in Figure 2a. For 220 kV transformers, the neutral DC threshold is 5 A [17]. Thus, the transformer DC bias risk exists only during the peak periods (about 7:00-10:00 and 16:00-20:00) of train operations.…”

Section: Introductionmentioning

confidence: 99%

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

Wang,

Lin,

et al. 2024

Electronics

View full text Add to dashboard Cite

show abstract

A Novel DC Bias Suppression Method Considering the Cooperation of Multiple Devices

Cited by 1 publication

References 31 publications

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

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

Contact Info

Product

Resources

About