Joint Planning Of Energy Storage And Transmission Network With Significant Wind Power Penetration

The problem of abandoning the wind caused by the structure of the transmission grid,the power regulation capacity of the system and the constraints of the wind power output characteristics is an important problem facing the current large-scale wind power grid connection.The energy storage equipment has the characteristics of fast charge and discharge.Energy storage is distributed in the power grid,which can improve the power supply structure and optimize the system adjustment ability;and deployed on the side of the wind farm,which can improve the output fluctuation of wind power and polish up the quality of wind energy.Therefore,it is an effective way to put energy storage equipment into the power grid with the large proportion of wind power in order to solve the problem of abandoning wind at the planning level through the coordinated planning of grid structure and energy storage equipment.This paper mainly focuses on joint planning of energy storage and transmission network with significant wind power penetration.Firstly,analysis the way to solve the problems of abandoned wind in the planning level,the basic theory and methods of solving the model with joint planning of energy storage and transmission network.To deal with the problem of abandoned wind power and limiting electricity due to anti-peaking characteristics and lack of system adjustment ability,in this paper,the energy storage equipment is distributed to the power grid with large wind power.Aim to minimize the equivalent annual investment cost of line and energy storage and the cost of discarding wind,the joint planning model of energy storage and transmission network is established,which can be solved by using GUROBI on the MATLAB platform.The validity and rationality of the model are verified by example systems.To deal with the problem of abandoned wind power and limiting electricity because of the violent wind wave,in this paper,the energy storage equipment is deployed on the side of the wind farm.A method considering the output power probability model of the wind-energy storage combined system based on the actual wind power output time series data is proposed.The line flow probability distribution is obtained by probabilistic load flow algorithm combining cumulant with Gram-Charlier series.And output range constraint of wind-storage combined system is introduced in the classical transmission network chance constrained planning model and the joint stochastic planning of energy storage and transmission considering probability model of the wind-storage combined system is established.The validity of the model is verified by comparing with the results of model based on Monte Carlo probabilistic power flow.Finally draws the conclusion:the energy storage which is connected with the wind farm has a significant effect on the suppression of wind power fluctuation and ’abandon wind’.In addition,research on joint planning of energy storage and transmission network is conducive to built a strong grid structure to meet local consumption and cross-district consumption of the large-scale wind power.