Integrated Planning Of Optimal Sizing And Siting Of Energy Storage Plants Across Wide Area

With the development of wind power and a growing number of large-scale wind farms access to the power grid,various adverse effects caused by wind power operation,such as multiscale safe and stable operation risks of power angle,voltage and frequency,have followed,due to the technical difficulties such as the randomness and volatility of wind power cannot be completely solved in the short term,and the level of wind power accommodation will be severely restricted.A solution to the problems above was given by the energy storage system for its unique capabilities of power control and energy supply-storage,which makes energy storage more widely used in the power grid,and it is believed that reasonable planning of sizing and siting of energy storage could maximize its benefits.At present,scholars mostly focus on the research on energy storage capacity planning,while the research on energy storage location planning is relatively scarce,and most of the research on the planning of capacity and location of energy storage systems are separated from each other.At the same time,more attention has been paid to distribution networks,and few are oriented towards large-scale wind power systems.Based on this,the integrated planning of sizing and siting of energy storage plants across wide area was studied,which mainly includes the following contents:(1)Analysis of mechanism of sizing and siting of energy storage plants.Based on the fourquadrant operation characteristics of energy storage devices,facing simple radiant networks and complex networks,the static voltage stability margin and wind capacity limit were quantitatively characterized by PV curve,in order to demonstrate the influence mechanism of capacity and location of energy storage plants on the static voltage stability and wind energy accommodation.On this basis,the idea of optimal sizing and siting of energy storage plants was proposed,based on the worst case of system static voltage stability margin and the best case of wind energy accommodation improvement.(2)Mathematical modeling of integrated planning of sizing and siting of energy storage plants across wide area and algorithm design.On the basis of mechanism research,the static voltage stability and wind energy accommodation were introduced into the planning of optimal sizing and siting of energy storage plants across wide area,and a multi-objective integrated planning model was developed to realize the optimal sizing and siting of energy storage plants across wide area as the static voltage stability margin and wind capacity limit in the company of network loss and energy storage investment were considered.The fitness function was constructed to transform the multi-objective function into single objective function for the sake of comprehensive evaluation of planning technicality and economy of energy storage plants,and a genetic algorithm embedded power flow and particle swarm optimization was designed to solve the planning model.(3)Development of integrated planning software of sizing and siting of energy storage plants across wide area and example simulation.Based on the aforementioned theoretical research results,the development of main functional modules and design of key user interface(UI)were completed by Qt Creator.Aiming at large-scale wind power base in Zhundong,Xinjiang,simulations of the impact of the number and capacity of energy storage plants on planning results were studied,and the optimal integrated planning scheme of sizing and siting of energy storage plants across wide area was given,which made the validity of the proposed model and method verified.