Abstract:In order to solve the problem of lack of effective technical method for the long and medium-term power market security check for dispatching center, a security check method for long and medium-term power market based on multi-period unit commitment model is proposed. The long and medium-term market unit commitment model is constructed to minimize the electric quantity completion rate deviation of power generation enterprises in long and medium-term power market, which takes the power balance constraint, network transmission capacity constraint, unit generation capacity constraint and other system operating constraints into consideration. Based on this model, the operation simulation of power network dispatching process is carried out. It could be determined whether the long and medium-term power market trading results meet the system operation requirements, by determining the deviation of the completion rate of the long and medium-term power trading results of each power generation enterprise. Finally, a case study based on the actual data in a certain provincial power grid shows that, compared with the traditional typical daily operation simulation checking method, the proposed checking method can effectively consider the operating requirements such as the unit start-stop time constraint, which is more suitable for the actual dispatching operation needs of power network and can give more accurate safety checking results.