Performance evaluation system for power grid dispatch and operation

In this paper, a new performance evaluation system used for large scale power grid operation is presented. It can not only be used to provide system dispatch baseline assessment, but also to quantitatively evaluate the influence from different kinds of impact factors. The evaluation system uses the mature Security Constrained Unit Commitment / Security Constrained Economic Dispatch (SCVC/SCED) model, which has been successfully applied in many RTO/ISOs in North America, as the basis of optimization engine. By analyzing large number of important historical data gathered during the running of the grid, it objectively evaluates and analyzes the grid operation of the previous day(s) to find out the possible economic and security problems. The analysis focuses on the various aspects of the differences between the actual system operational results and the optimal dispatch proposed by the optimization engine. Resolutions will be provided to improve the efficiency of system dispatch and operation. The evaluation system was installed in NCG (North China Grid) dispatch center and was put into operation in 2010. The effectiveness of the system has been proven through more than one year´s NCG operation practice.