A database approach integrating a visually interactive load flow for low voltage system

This paper presents an alternative approach to a visually interactive load flow and distribution loss calculation for a radially operated distribution network in. buildings. By using the proposed database structure, any distr ibution network can be specified and modeled effectively, including the who le types and sizes of cables under different installation methods. Based on our proposed solution algorithm, matched with the database structure, load flow results can be calculated directly without formulating the admittance matrix. Thus, there is practically no limit to the number of nodes, and th us it does not require sparse techniques in matrix inversion. Any breaker i n the network can be operated or tripped and a new load flow will be calcul ated and displayed. Based on the information in the database and a drawing algorithm, the single-line diagram of the network is drawn automatically an d the calculated results can be dynamically positioned on the single line d iagram. Test results confirm that the proposed system provides almost ident ical solution as compared with the conventional method.