Electricity Network Topology Based On Interval Analysis

Power network topology analysis is a crucial module of Energy Manage System (EMS). Topology processing analyzes equipment connectivity and energized status and builds bus model to support PAS (Power Advance Software) and connectivity presentation on user displays. Network topology analysis is foundation of all application software. It is used all kinds of network analysis including dynamic color-draw, state estimate, dispatch power flow, voltage quality control, fault analysis and dispatch training etc.An important requirement of network topology analysis is real time and fleetness. It need immediately give us the analysis result and change the color of topology when the breaker's or the switch's state changed. Many experts contrived many ways to improve the efficiency. The essence is to reduce recursive times and search scope by recursive search grid. The author had plenty of power system project practices and referenced many power system books, and then the author brings the bay oriented way forward. Analyzing power system wiring diagrams, we can see that the substation wiring diagram have many same or similar wire cells. It isn't only coincidence but the power system's inbeing. We consider power system as many bays, and at first analyze each bay's topology and then save all results to database. When analyzing the substation, firstly get the bay's state and topology result, secondly analyze the same voltage level sub circuit, thirdly analysis substation according junction's state, and at last analyze the whole system according line's state.The most effective way is to reduce repeated calculation. Because the same bay structure exists abundantly in substation, we can use the advance result not but repeatedly analysis every time. Therefore it will reduce much repeated calculation and improve the operation efficiency. Moreover the bay concept improves the graph modeling speed and establishes the basic of dispatch operation ticket system application.