Design and analysis of hybrid DC circuit breaker for LVDC grid systems
Design and analysis of hybrid DC circuit breaker for LVDC grid systems
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DOI：
10.1007/s43236-021-00272-2
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发表时间：
2021-06
影响因子：
1.4
通讯作者：
Dong-Uk Kim;Sungmin Kim
中科院分区：
文献类型：
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作者：
Dong-Uk Kim;Sungmin Kim
产生DC电力的可再生能源的新兴互连已经导致对DC电网系统的需求。在这种情况下，低压直流（LVDC）电网系统可能是这些直流电源的解决方案。对于LVDC电网的可靠运行，DC故障是一个问题，并且DC断路器（DC CB）是清除故障电流的适当设备。然而，有一些困难，在打破直流故障，如没有过零的电流和电压，和高di/dt的故障电流。提出了一种适用于低压直流输电系统的新型结构的混合式断路器。主开关由真空灭弧室（VI）和永磁操动机构（PMA）组成。提出了一些改进措施，以提高性能的PMA。提出了一种由最少数量的电力电子器件组成的双向换流回路。为了吸收故障能量，应用电容器和二极管回路。文中分析了HCB的工作原理和各组成部分的设计方法。通过仿真模型，选择并验证了所设计的元件。实验结果与实现的原型（750 V/300 A）验证了设计方法和它的性能。
The emerging interconnections of renewable energy sources that generate DC power have resulted in demands on DC grid systems. In this situation, a low-voltage DC (LVDC) grid system could be a solution for these DC power sources. For the reliable operation of a LVDC grid, DC faults are an issue and DC circuit breakers (DC CBs) are appropriate devices to clear fault current. However, there are some difficulties in terms of breaking DC faults such as the absence of zero crossing of the current and voltage, and the high di/dt of the fault current. This paper proposes a hybrid circuit breaker (HCB) with a new structure for a LVDC grid system. The main switch consists of a vacuum interrupter (VI) and a permanent magnetic actuator (PMA). Some improvements are proposed to enhance the performance of the PMA. A bi-directional commutation loop consisting of a minimum number of power electronic devices is suggested. To absorb fault energy, a capacitor and a diode loop are applied. The principle of the proposed HCB and the design methods for all of the components are analyzed. Through a simulation model, the designed components are selected and verified. Experimental results with a realized prototype (750 V/300A) verify the design method and its performance.