Study of the minimum unit scheduling technology for the grid with substantial power import and restricted generation schedule

In order to deal with the problems caused by reduced schedule of the local units, a minimum unit scheduling and evaluation technology based on the multiple security and stability constraints is developed in this paper. The process of minimum unit scheduling is determined. The quantitative method is proposed to evaluate the security and stability margin of the grid under the minimum unit schedule. In addition, the application of the technology in the scheduling of local units in Shanghai grid is presented for two typical scenarios of 2016. The study of minimum unit scheduling technology is expected to provide guidance on safe and reliable unit commitment scheduling and facilitate the implementation of “energy saving and emission reduction” program through the efficient usage of external clean power and lowering dependence on fuel-fired plants.