Power transaction security check optimization model and system of AC / DC hybrid power grid applied in China Southern Power Grid

Abstract

With the continuous and in-depth promotion of China electric power reform, the annual and monthly trading volume of electric power is increasing, the power transaction security check is mainly based on the artificial experience to add and subtract the power components that is difficult to analyse the unit group with member coupling and the power restriction relationship between transmission sections. China Southern Power Grid has developed a set of power transaction security check system using improved SCUC optimization model. The system is able to effectively locate the reason for the power transaction security check exceeding the limit and give the optimization and adjustment suggestions. The efficiency and calculation speed of the power transaction security check optimization algorithm for large scale of AC / DC hybrid power grid are successfully improved. The IEEE RTS 96 system and CSG power system are used to test the efficiency of the algorithm under different grid scales. The calculation time is proved to be reduced about 50% and generation cost is almost the same as the conventional algorithm. The construction and application of the system helps CSG to solve the surplus hydropower consumption problem.