Approach and basic evaluation for the DC circuit breaker with fault current limiting feature
Approach and basic evaluation for the DC circuit breaker with fault current limiting feature
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DOI：
10.1109/intlec.2016.7749138
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
M. Komatsu
中科院分区：
文献类型：
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作者：
M. Komatsu
未来的电网为配电网，正缓慢地朝着直流输电的方向发展。在直流电网中，为了防止故障传播，提供过载和故障保护，隔离故障负载，必须在开关设备上安装过流保护装置，对系统进行电力管理和控制。过流保护装置，如一次和二次配电系统中的机电断路器，保护放电母线负载侧的所有分支电路。这种类型的断路器具有时间延迟特性的冲突，当存在真正的故障时，跳闸延迟必须足够长才能断开电路。它应该会引起麻烦的绊倒。我们正在研制一种固态型电源开关装置，作为直流电网中替代机电断路器的一种新型电源装置。这些开关器件的候选器件应该是功率MOSFET， IGBT和SiC MOSFET。直流电网保护新型电力装置的发展环境得到了改善。针对中低压直流电网的应用，提出了将硅功率MOSFET、IGBT和SiC MOSFET应用于直流断路器的思路。本文通过实验对直流断路器的速动开关和限流功能进行了初步的评价。我们的原型开关器件将在20 μs内打开，我们可以自由调整这个运行时间和故障电流额定值。为了避免干扰跳闸，我们使用相同的控制电路，通过延长运行时间，成功地实现了限流功能。
The future electricity grid for the electric power distribution network is slowly moving in the direction of dc transmission. In order to prevent the fault propagation, provide protection against overload and fault, and isolate the faulty load in a dc power network, an overcurrent protection device must be applied to the switch gear for electric power management and control of the systems. Overcurrent protection devises such as electromechanical circuit breaker in the primary and secondary distribution systems protect all branch circuits on the load side of the discharge bus. This type of circuit breaker has the conflicting of time delay characteristics that trip delays must be long enough to open the circuit when a real fault exists. It should cause nuisance tripping. We are developing a solid state type of power switching device as a new power device for dc power network instead of electromechanical circuit breaker. The candidate for these switching devices should be Power MOSFET, IGBT, and SiC MOSFET. The environment of development of dc grids protection new power devices are now improved. Focusing on the application for the low and medium voltage dc grid, fast-acting switching function and current limiting features are brought up the idea to apply Si Power MOSFET, IGBT, and SiC MOSFET to the dc circuit breaker. The very basic evaluation for this fast-acting switching and current limiting function for the dc circuit breaker are shown by experiment in this paper. Our prototype switching device will open within 20 μs and we can freely adjust this elapsed time and fault current rating. To avoid nuisance tripping, we successfully performed current limiting function by extend the elapsed time using same control circuit.