Appropriate Protection Scheme for DC Grid Based on the Half Bridge Modular Multilevel Converter System
Appropriate Protection Scheme for DC Grid Based on the Half Bridge Modular Multilevel Converter System
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DOI：
10.3390/en12101837
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发表时间：
2019-05
期刊：
影响因子：
3.2
通讯作者：
Ho-Yun Lee;M. Asif;Kyu-Hoon Park;Hyun-Min Mun;Bang-wook Lee
中科院分区：
文献类型：
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作者：
Ho-Yun Lee;M. Asif;Kyu-Hoon Park;Hyun-Min Mun;Bang-wook Lee
半桥（HB）模块化多电平变换器（MMC）技术被认为是克服传统电压源变换器（VSC）在高压直流（HVDC）电网应用中的缺点的一项突破。然而，由于快速di/dt和极高水平的直流故障电流，直流故障的中断仍然是一个挑战。使用直流断路器（DCCB）进行故障中断会导致整个DCCB产生巨大的能量损耗和电压应力。因此，使用故障限流器是必不可少的，超导故障限流器（SFCL）是最有前途的选择。过去的文献主要关注DCCB的工作特征或SFCL的限制特征。然而，对于DCCB和SFCL的故障中断和系统恢复特性的理解却很少。在本文中，我们对三种类型的限错装置与断路器的组合进行了故障中断和系统恢复特性的比较研究。通过对交直流系统的暂态分析，提出了最优的保护方案。综上所述，在三种限错装置中，混合式SFCL与断路器组合在中断时间、恢复时间、能量耗散和电压瞬态方面具有最理想的性能。
The half bridge (HB) modular multilevel converter (MMC) technology is considered a breakthrough to mitigate the shortcomings of the conventional voltage source converter (VSC) in high-voltage direct-current (HVDC) grid application. However, interruption of the DC fault is still a challenge due to fast di/dt and extremely high levels of DC fault current. The fault interruption using a DC circuit breaker (DCCB) causes enormous energy dissipation and voltage stress across the DCCB. Therefore, the use of a fault current limiter is essential, and the superconducting fault current limiter (SFCL) is the most promising choice. Past literature has focused on the operating characteristics of DCCB or limiting characteristics of the SFCL. However, there is little understanding about the fault interruption and system recovery characteristics considering both DCCB and SFCL. In this paper, we have presented a comparative study on fault interruption and system recovery characteristics considering three types of fault limiting devices in combination with circuit breaker. The transient analyses of AC and DC system have been performed, to suggest the most preferable protection scheme. It has been concluded that, amongst the three fault limiting devices, the Hybrid SFCL in combination with circuit breaker, delivers the most desirable performance in terms of interruption time, recovery time, energy dissipation and voltage transients.