Single-phase grouding fault analysis and control scheme of transformerless flexible multistate switch

Abstract

The compact design is suitable for the urban areas with intensive loads. The flexible multistate switch (FMS) can effectively reduce the footprint by removing transformers, which is the development trend of the flexible AC distribution equipment. In PSCAD/EMTDC, a simulation model containing two supply areas embedded in a transformerless FMS is built. Through the single-phase grounding fault simulation under the arc suppression coil grounding, the characteristics of zero-sequence component of FMS are analysed. By means of circuit analysis and sequence component decomposition, the intrinsic mechanism of AC/DC voltage fluctuation in the non-fault supply area caused by the zero-sequence component at the fault area is analysed, and the simulation result is explained. Based on the feeder transformation, a new protection and control scheme is proposed to overcome the problem of the zero-sequence ride through among different supply areas.

Keywords

• earthing
• power distribution faults
• arcs (electric)
• coils
• power distribution protection
• power distribution control
• phase grouding fault analysis
• control scheme
• transformerless flexible multistate switch
• compact design
• urban areas
• intensive loads
• removing transformers
• development trend
• flexible AC distribution equipment
• simulation model
• transformerless FMS
• single-phase grounding fault simulation
• arc suppression coil grounding
• zero-sequence component
• circuit analysis
• sequence component decomposition
• nonfault supply area
• fault area
• simulation result
• feeder transformation
• zero-sequence ride
• PSCAD-EMTDC
• supply areas
• AC-DC voltage fluctuation