Abstract
The energy router composed of double active bridge (DAB) can interconnect multiple voltage level AC distribution network through DC lines to form AC/DC hybrid distribution network. The fault types of the system are diverse and the fault characteristics are complex. This paper studies the fault characteristics of the system in detail. The single-phase grounding fault of AC network side and single-phase grounding fault of AC valve side occurred in the system. This paper explored the impact of the AC side of the system after the above failure, and make a detailed comparative analysis. The results show that DAB can isolate the influence of AC side fault, and provide theoretical basis for the selection of grounding mode and the design of protection system for AC/DC hybrid distribution network.
Highlights
In recent years, with the aggravation of energy shortage and environmental pollution in the world, distributed energy technology has developed rapidly
The existence of dual active bridge (DAB) can isolate the influence of high-voltage and low-voltage AC system faults on the non fault side system, and maintain the stability of DC bus voltage on the non fault side
When high voltage AC network side fault occurs in the system, DAB can isolate the double frequency fluctuation of high voltage DC bus to ensure that the low voltage DC bus will not be affected in the process of fault
Summary
With the aggravation of energy shortage and environmental pollution in the world, distributed energy technology has developed rapidly. DC power grid is easier to realize distributed energy access than traditional AC power grid, and has the advantages of low loss, low environmental pollution and high power quality, so it has been widely concerned and studied [1,2]. China has begun to study system control strategy, topology design and other aspects [6,7]. It is one of the common schemes to connect multiple AC distribution networks through DC distribution network by converter stations. Due to the different AC distribution network voltage level is not consistent, the DC bus voltage level formed by converter station will be different. Energy router applied in AC / DC hybrid distribution network needs to realize electrical isolation. This paper selects the dual active bridge (DAB) energy router suitable for medium and high power applications as the intermediate equipment of interconnected AC distribution network and DC distribution network
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