Study Of Wind-photovoltaic-hydro Joint Dispatch Based On Multi-objective Cuckoo Search Algorithm

As wind energy and solar energy have been connected to the power grid,it has many characteristics,such as randomness and fluctuation of power output,which brings many new challenges to the power system.How to effective use these new resources while decreasing the impacts on the grid has aroused the wide attention from domestic and overseas scholars.Large-scale cascade hydropower stations access system not only offer sufficient power support for the system but also satisfie the requirements of quick system peak-shaving and lays foundation for new energy source assess system based on the quick star-stop and flexible operation advantages of hydro-power generating units.However,the complex superior-subordinate coupling relationship of cascade hydropower stations cause difficulty for construction and solution.As mentioned above,on the premise of considering various power source features,how to formulate rational multi-power adjustment strategy and find proper solution methods for complex models is the urgent problem to be solved.In this paper,wind power,photovoltaic and cascade hydropower stations as the research object.First of all,the current situation of development and the significance of joint dispatching of multiple power sources are described.Then,the algorithm of the existing scheduling model is studied,and an improved multi-objective cuckoo algorithm is proposed.Fuzzy decision model is used as a multi-objective decision making method.Secondly,this thesis respectively establishes the long-term multi-objective dispatch model for cascade hydropower stations and short-term joint dispatch model for wind,photovoltaic and cascade hydropower stations.In the end,this thesis illustrates specific cases to test the accuracy and feasibility of algorithm and model.As proved by the results,in the multi-objective dispatch model for cascade hydropower stations,this model takes maximal annual power generation and guarantee output in cascade hydropower stations as the objective and solves the model with the improved multi-objective cuckoo algorithm,concluding a set of uniform distributed non-inferior dispatch plan sets.By way of ambiguous decision model,this thesis selects a compromise solution and figures out the electricity generation and water usage process in each hydropower station.In the multi-power joint dispatch model of wind,photovoltaic and cascade hydropower stations,this thesis takes minimum surplus load peak-valley difference and minimum surplus load fluctuation as the objective and solves with the improved multi-objective cuckoo algorithm,concluding that the introduction of cascade hydropower stations could effectively decrease load peak-valley difference and stabilize the surplus load process of other distributed power sources in order to guarantee the secure economic operation of grid and improve the capacity of grid energy resources.