Distribution Automation, Power Line Carrier Communication And Database Research

This paper concentrates on delving distribution network. Based on analysingdistribution-network features. distribution outomation development at home and abroad,a general design is proposed. Its architecture is a layered and distributed opening systembased on power line carrier technique. Distribution automation is a large scale systemincluding computer,communication and electric power system technology It is a modernsubject for city and countryside power distribution reconstruction in China. Developing asuit of reliable. flexible. expandable,convenient using ,maintainable and powerfulfunctions distribution automation system is an urgent task for city and countryside powerdistribution reconstruction in China at present.The key problem of distribution system is communication. In this thesis, a network-distribution line carrier (NDLC) communication system based on Digital SignalProcessing (DSP) technology is introduced and implemented, Which is suitble for theprotection and control of distribution systems. The characteristics and channel attenuationof distribution system line carrier communication are analysed. Some practical measuresare studied in order to improve the relibility of NDLC system and networking princilesare also provided for the distribution line carrier communication system. Communicationprocessor is a connecting link between the preceding and the following device in thedistribution system communication. It transmits remote control and communicationinformation. In this thesis, a communication processor software-based IEC870.5-101transmission protocols and DNP3.0 is designed and programmed.The distribution automation system takes advantage of the world softwares designideas. In this thesis, the emphase is designing and programming the real-time database(RTDB). The new idea Which electric power systems facilities regarded as nodes is bringforward. Based on the node, a new share memory design for distribution automationdatabase conjoining real-time database to commericial database is introduced andimplemented. On the other, a technique-dynamic link library (DLL) accessing databaseis adopted. The software of real time database (RTDB) and DLL are implemented withVC++6.0.This distribution automation system has good reliability, flexibility andopening.