Optimal Method of Minimum Start-Up Mode for Conventional Units Considering Multi-Factor Constraints

With the increasing proportion of external power supply and the installed capacity of new energy, the start-up mode for conventional units of the receiver power grid network is gradually decreasing, and the minimum start-up sequence needs to be optimized in order to maintain the stability of the power grid. In this paper, the key factors affecting the minimum start-up units are extracted, and the quantitative indicators of the multi-feed short-circuit ratio of new energy, the electrical distance between the generator and the weak node, and the dynamic reactive power response of the generator are extracted, which are used to characterize the support ability of the power grid unit start-up mode to the system voltage stability. Then, with the goal of optimizing the above indicators, considering the operation constraints of conventional units and new energy units, the minimum start-up optimization model of the power grid is established to determine the minimum start-up sequence of the power grid. Finally, taking the actual power grid in China as an example, the simulation proves the correctness and effectiveness of the proposed method.