Abstract:

The component layout area of PV power station is large, the DC-side bus series is more, the number of DC bus cables is large, the cost of the DC bus cables is a large proportion to the PV power station, and the efficiency loss of power plant caused by the DC bus cable loss is high after the completion of PV power station, therefore, it should focus on the selection of economic section in the cross-section selection of DC bus cable. At present, the economic current density curves in the relevant electrical rule or code are suitable for AC cables but can not be used in the economic section of DC bus cables. Combined with the characteristic of PV power station, this paper put forward the calculation method for the economic current density of DC bus cables in PV power station based on the appendix B of GB 50217. On this basis, the comprehensive selection method of DC bus cables was presented based on the existing codes.

Key words: PV power station, DC bus cable, economic current density, cable selection