Protection of MV/LV solid-state transformers in the distribution grid
Protection of MV/LV solid-state transformers in the distribution grid
复制标题
配电网中压/低压固态变压器的保护
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Kolar
中科院分区：
文献类型：
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作者：
T. Guillod;F. Krismer;R. Färber;C. Franck;J. Kolar
固态变压器(SST)是一项很有前途的技术，因为它们将高效率与电网中新功能和服务的集成结合在一起。SST建立了中压交流三相电网和低压交流或直流电网之间的接口。因此，由于电网中发生的故障，SST容易受到电应力的影响。中压和低压电网反过来又暴露在SST故障的影响下。因此，必须找到一种合适的SST及其保护装置的设计。本文找出了与SST相关的不同应力，分析了目前用于低频变压器的保护机制，并提出了适用于SST的保护方案。MV短路和过电压被认为是最关键的应力，并进行了详细的分析。最后，给出了设计稳健海温的一些指导原则。
Solid-State Transformers (SSTs) are a promising technology since they combine a high efficiency with the integration of new functionalities and services in the grid. A SST establishes the interface between a MV AC three-phase grid and a LV AC or DC grid. For this reason a SST is subject to electrical stresses due to faults occurring in the grid. The MV and LV grids are in return exposed to failures of the SSTs. Therefore, a suitable design of the SST and its corresponding protection devices has to be found. This paper identifies the different stresses which are relevant for a SST, analyzes the protection mechanisms which are currently used for low-frequency transformers and proposes adapted protection schemes for SSTs. MV short circuits and overvoltages are identified as the most critical stresses and are analyzed in detail. Finally, some guidelines are extracted for designing a robust SST.