Hierarchy Optimization Method for Day-ahead Coordinated Power Dispatch with Priority Given to Clean Energy

With the increment of installed capacity for renewable energy in power system, wind power curtailment occurs frequently during the process of dispatch. The randomness and intermittence of renewable energy aggravate deep peaking-regulation of thermal power unit, making power fluctuation of each unit. Otherwise, the impact on the environment by carbon emission cannot be ignored. In this paper, a hierarchy optimization method is proposed to divide a large-scale nonlinear dispatch problem into linear part and nonlinear part. Each stage guarantees different objects from different perspectives, i.e. clean energy penetration rate, economy, environment influence and unit fluctuation. Finally, the validity of the proposed method is verified on a system combined with thermal power unit, hydro power unit and a wind farm equipped with battery storage system.