Hui Fan

The Analysis Method of Line Loss for Planning Grid

The line loss of power system is an important economic indicator in the operation of power system.The analysis method of line loss for planning grid is developed. The data of system are taken from EMS. After getting data from EMS, state estimation will be carried out periodically. The feature program is that it can analyze the line loss for planning grid in the corresponding period.The program of the analysis and calculation on line loss of planning grid include six subsystems such as modeling subsystem of power system planning, modeling subsystem of statistics for line loss, calculation of line loss subsystem, storage subsystem of integration for line loss, analysis and query of line loss subsystem, analysis of line loss subsystem. The corresponding operation are set on many equipments such as lines and transformers and capacitors and so on in the planning grid. The new substation is built through these operation.It can evaluate the reducing line loss benefits of power system panning project. And it can provide the decision-making function for power system line loss management and the investment of power system planning.

Development of dynamic test system for digital relay protection based on IEC61850 standards

In recent years, electronic mutual-inductor and IEC61850 serial standards are adopted in digital substation. Once electronic mutual-inductor has been used, the input signals of relay protection and other secondary devices are not the traditional analog quantities any more. The simulation system cannot offer such interface up to now, so the secondary devices which are based on electronic mutual-inductor in digital substation cannot be tested and researched in this way. A kind of testing system aiming to real-time digital relay protection is introduced in this paper. By adding secondary interface to the primary simulation system, such as ADPSS (invented by China Electric Power Research Institute), a closed-loop testing system which is based on IEC61850 standards is established. The testing results verify that the system has great significance on improving the application of digital substation, and it has great use value.