Research On The Optimal Coordinated Operation Planning Of Thermal Power And Renewable Energy Unit In Shandong Electrical Power Grid

In the past five years renewable energy unit such as wind power developed fast in Shandong power grid. Wind power with strong intermittence, randomness and volatility, is difficult to be scheduled as conventional generation unit. With large-scale wind power integration, Shandong electrical power grid is confronting new challenges in terms of system peak-load shaving, frequency regulation, and reserve arrangements. To meet the actual needs of Shandong electrical power grid, a new generation planning strategy is proposed based on the optimal coordinated operation of thermal power and renewable energy plant.In this paper, the minimum cost, risk control, and fair consumption of large-scale wind power are considered as the objective of planning. A whole scene model of wind power output is established based on the interval number theory, which fully takes the fluctuation characteristics of wind power into account; Generation plan is developed considering the wind power output expectation given by some large probability events, which also sets aside adequate optimal scheduling space to accommodate the extreme fluctuations of wind power, and then, the generation scheduling with preventive risk control is achieved with minimum cost. To cope with the extreme computational complexity brought by large-scale wind power integration, critical scene identification method is utilized, which guarantees the lossless of information and envelops all possible extreme scenario of wind power fluctuation.The panoramic day rolling model of power generation planning with considering wind power output fluctuations is derived through two modes, known as electricity coordination and cost control. This model enables tracking the before-day generation schedule and choosing different constraints to satisfy both modes. Based on the theory and method introduced above, before-day and day-rolling generation planning could be fulfilled with new functions, such as wind power access, optimal validation algorithm, comprehensive wind power index evaluation, monthly wind power electricity demand forecast, and evaluation of both thermal power plants and wind farms according to "Operational management implementation regulations of wind farm integration of Northchina power grid".Though the optimal planning method proposed in this paper, new features could be fully achieved, regarding the inclusiveness of the whole wind power output scenario, the efficiency of panoramic before-day generation planning, the accuracy of day-planed electricity tracking of conventional generators, and the fairness of conventional units output regulation according to wind power fluctuation. Finally, the optimality, fairness and efficiency of power grid operation are comprehensively improved, as well as the ability to consume large-scale renewable energy.