Abstract
As the continuous consumption of non-renewable energy leads to resource shortages, distributed PV generation technology has received widespread attention. The DC microgrid is an effective way to connect distributed PV generation. However, DC microgrids have numerous challenges, such as the absence of zero current crossing point and high fault current rising rate. In the paper, a bi-directional DC solid-state circuit breaker based on flipped Γ-source is proposed to overcome some of the challenges in DC microgrid. The topology uses the mutual inductance current generated by the transformer to force the SCR naturally commutates off. Which can rapidly interrupt and isolate the faulty part, and at the same time, there will be no circulating current impact on the source side. The diode bridges allow the response to faults on either the source or load side with only a single controlled switch. Therefore, the topology is simplified while enabling it to obtain the capability of bidirectional operation protection. Finally, using the simulation software PSCAD/EMTDC and experimental platform verifies the effectiveness of the topology in this paper.
Highlights
In recent years, as the consumption of non-renewable energy leads to resource shortages and the deterioration of environmental pollution, distributed renewable energy power generation technologies such as wind power generation and solar power generation have received widespread attention
DC solid-state circuit breakerverifies proposed in load-side this paper,sho this section builds an experimental platform with a power supply voltage of 48 V, a steady-state fault detection and breaking process
1.2 io VSCR This paper proposed a DC microgrid protection design based on the flip Γ source D
Summary
As the consumption of non-renewable energy leads to resource shortages and the deterioration of environmental pollution, distributed renewable energy power generation technologies such as wind power generation and solar power generation have received widespread attention. The solid-state circuit breakers use the advantage of power electronic devices to realize arc-free shutdown and rapidly isolate the fault current. The Z-source solid-state DC circuit breaker does not need to use additional control circuits when the short-circuit fault current rises rapidly. It can realize the natural zero-crossing point of the SCR circuit current and automatically isolate the short-circuit fault current. Four types of bi-directional Z-source DC circuit breakers are proposed in references [17–20] These bi-directional topologies have some problems, such as an excessive number of components, a complex circuit structure, fault current having a particular impact on the source side, etc.
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