Journal article
Overvoltage Estimation by Stray Inductances During Turn-off of a 500 kV/25 kA DC Circuit Breaker
IEEE transactions on power electronics, v 36(7), pp 7400-7406
Jul 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Metal oxide varistors (MOVs) are usually applied to clamp the voltage across a dc circuit breaker (DCCB) after fault current elimination. This letter focuses on the transient process of a DCCB turn-off and has three contributions. First, it reveals that snubber circuit inductance, the internal and external stray inductances of an MOV could cause a significant overvoltage across a DCCB, which exceeds 47.5% of its nominal clamping voltage. The overvoltage mechanism is clearly analyzed based on the working principle of a DCCB, providing theoretical equations to estimate the overvoltage magnitude. Second, a nonlinear model of an MOV is proposed to simplify the calculation and provide an accurate estimation result. Third, a new arrangement of series submodules with discrete MOVs is proposed to suppress the overvoltage. A hybrid 500 kV/25 kA DCCB prototype with series insulated gate bipolar transistors (IGBTs) is implemented to validate the proposed analysis. The series-IGBT rating voltage is 1440 kV, and the MOV with a nominal clamping voltage of 800 kV is used to protect IGBTs. However, a 25 kA turn-off experiment clearly shows that the overvoltage increased to 1203 kV by an external stray inductance of 39.5 μH and di/dt of 1480 A/μs. The relative error between measurements and simulations is within 3%. Besides, simulations on the new arrangement show the overvoltage is decreased by 23.4% than before.
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Details
- Title
- Overvoltage Estimation by Stray Inductances During Turn-off of a 500 kV/25 kA DC Circuit Breaker
- Creators
- Zhonghao Dongye - North China Electric Power UniversityLei Qi - North China Electric Power UniversityKexin Liu - North China Electric Power UniversityXiaoguang Wei - Global Energy Interconnection Research Institute North AmericaFei Lu - Department of Electrical and Computer Engineering, Drexel University, Philadelphia, PA, USAXiang Cui - North China Electric Power University
- Publication Details
- IEEE transactions on power electronics, v 36(7), pp 7400-7406
- Publisher
- IEEE
- Grant note
- 51977073 / National Natural Science Foundation Of China (10.13039/501100001809)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Electrical and Computer Engineering
- Web of Science ID
- WOS:000626599400012
- Scopus ID
- 2-s2.0-85098761316
- Other Identifier
- 991019168864304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Engineering, Electrical & Electronic