Regional and Provincial Grid Coordinated Optimal Real-time Dispatch Method and Application for Power Grid with High Proportion of Hydropower

Yunnan Power Grid of China is a typical large-scale DC transmission system with a high proportion of clean energy. In the flood season and dry season, there is the problem of insufficient peak and frequency regulation capacities, and the operation mode of deep coupling of peak and frequency regulation makes the intraday dispatch and control more difficult. In order to maximize the accommodation of clean energy, a regional and provincial grid coordinated optimal real-time dispatch method for Power Dispatch and Control Center of China Southern Power Grid and Power Dispatch and Control Center of Yunnan Power Grid of China is proposed. According to the inflow of basin and the transmission section constraint, the positive and negative echelon power plants in the basin are formed through the day-ahead pre-arrangement. According to the intraday real-time operation deviation of the system, the power plants are called based on the echelon order, so as to realize the deviation allocation of the two-level regional and provincial dispatch and control centers, and effectively solve the problems such as the coordination of the regional and provincial grid, the cascade coordination of the hydropower stations, the ramp of hydropower units, the constraint of vibration zone, and the connection to the frequency regulation ancillary service market. The regional and provincial grid coordinated optimal real-time dispatch system has completed the development and deployment, and has been effectively applied in the real-time operation of two-level regional and provincial dispatch and control centers. It has realized the real-time balance of the power generation deviation of Yunnan Power Grid of China and the decoupling of peak and frequency regulation, which has promoted the clean energy accommodation of China Southern Power Grid. © 2022 Automation of Electric Power Systems Press.