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Performance Evaluation and Limitations of Overvoltage Suppression Circuits for Low- and Medium-Voltage DC Solid-State Breakers
IEEE Open Journal of Power Electronics Pub Date : 2021-03-24 , DOI: 10.1109/ojpel.2021.3068531
Andreas Giannakis , Dimosthenis Peftitsis

This paper presents a design and performance evaluation of three different overvoltage suppression circuits employed in a solid-state circuit breaker for medium- to high-power and low- to medium-voltage DC grids. The evaluated criteria are the requirements for passive components, as well as the breaker performance in terms of peak switch overvoltage, peak short-circuit current, fault clearance time and rate of voltage rise during the fault clearing process. Additionally, the impact of the stray inductance in the solid-state breaker design on the anticipated overvoltage is also investigated. Design and operating limitations of each configuration from an application perspective are also discussed. From simulations of a 1.8 kV and 500 A breaker for high-power medium-voltage DC applications it is shown that the most effective overvoltage suppression is achieved by means of using a metal-oxide varistor and a snubber capacitor connected in parallel with the main switch at a cost of high fault current. A medium-power solid-state DC breaker prototype rated at 1.5 kV and 50 A was also designed and constructed. The experimental results reveal that using only a metal-oxide varistor can be sufficient when the breaker employs high-voltage discrete semiconductors with long current falling time and is used in medium-power medium-voltage grids.

中文翻译:

中低压直流固态断路器的过电压抑制电路的性能评估和局限性

本文介绍了用于中高功率和中低电压直流电网的固态断路器中使用的三种不同的过压抑制电路的设计和性能评估。评估的标准是对无源组件的要求,以及在故障清除过程中断路器的峰值开关过电压,峰值短路电流,故障清除时间和电压上升速率方面的性能。此外,还研究了固态断路器设计中杂散电感对预期过电压的影响。从应用程序的角度,还讨论了每种配置的设计和操作限制。来自对1.的模拟。适用于大功率中压直流应用的8 kV和500 A断路器表明,通过使用与主开关并联连接的金属氧化物压敏电阻和缓冲电容器,可以最有效地抑制过电压。高故障电流。还设计并制造了额定功率为1.5 kV和50 A的中功率固态直流断路器原型。实验结果表明,当断路器采用电流下降时间较长的高压分立半导体并用于中功率中压电网时,仅使用金属氧化物变阻器就足够了。还设计和制造了5 kV和50 A的电流。实验结果表明,当断路器采用电流下降时间较长的高压分立半导体并用于中功率中压电网时,仅使用金属氧化物变阻器就足够了。还设计和制造了5 kV和50 A的电流。实验结果表明,当断路器采用电流下降时间较长的高压分立半导体并用于中功率中压电网时,仅使用金属氧化物变阻器就足够了。
更新日期:2021-05-11
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