Research On Coordinated Planning Of Wind Power And Energy Storage In Distribution Network Considering Demand Response

The development of wind power can effectively alleviate the shortage of fossil energy.With the increasing of wind power penetration of distribution network in China,more and more attention has been paid to the influence of the fluctuation and intermittence of wind power output on the planning and operation of distribution network.How to ensure the reliability and economy of distribution network under the condition of wind power grid connection through technical means and demand incentive mechanism at all levels of distribution network planning and operation is a hot research topic at present.Energy storage has good active power regulation performance,reasonable allocation of energy storage capacity,can make full use of the capacity effect of wind power to meet the demand of distribution network load.The power quality and operation economy of distribution network can also be ensured by adjusting the output of energy storage to track the rapid change of wind power output and load.The demand response can reduce the peak-valley difference of net load(load minus wind power output)of distribution network by changing the time distribution characteristics of load,reduce the demand for energy storage and regulation capacity,and thus reduce the allocation cost of energy storage.Therefore,considering the coordination of demand response,wind power and energy storage,the coordination planning of wind power and energy storage in distribution network is of great significance to improve the safety and economy of distribution network and the utilization ratio of wind power.In this paper,the coordination planning problem of distribution network wind power and energy storage considering demand response is studied.The goal is to minimize the integrated cost of distribution network wind power,energy storage and demand response.Considering the influence of demand response on the coordinated planning of wind power and energy storage in distribution network,This paper studies the coordination planning method of wind power and energy storage in distribution network under the condition of low penetration of wind power,the coordination planning method of wind power and energy storage in distribution network to ensure the reliability of power supply to important loads under the condition of high penetration of wind power,the coordination planning method of wind power and energy storage in distribution network.Multi-stage dynamic programming method for energy storage.On this basis,the evaluation method of wind power and energy storage combined system confidence capacity of distribution network considering demand response is studied in order to assist in the determination of distribution network substation capacity.The main research contents of this paper are as follows:(1)The coordination planning methodology of wind power and energy storage in distribution network considering demand response is studied under the condition of low penetration of wind power.The cost benefit model of demand response,wind power and energy storage of distribution network is established,and the coordination method between demand response and charge / discharge strategy of energy storage is analyzed under the condition of low permeability of wind power.On this basis,a bilevel programming model for wind power and energy storage allocation of distribution network considering demand response is established,in which the minimum integrated cost of energy storage is the lower level goal,and the minimum wind power and demand response cost is the upper level goal.The coordinated planning of wind power and energy storage in distribution network is realized.The KKT(Karush Kuhn Tucker)method and the improved particle swarm optimization(PSO)algorithm are used to study the solution of the model.The proposed model and algorithm are verified by an example of IEEE 33-bus system.The simulation results show the correctness of the model and the effectiveness of the algorithm.(2)Under the condition of high penetration of wind power,the coordination planning method of wind power and energy storage in distribution network is studied,which considers the demand response to ensure the reliability of power supply of important load.The implementation strategy of demand response and the control strategy of energy storage in isolated islands of distribution network planning are analyzed.The division method of distribution network planning islands to ensure the reliability of power supply for important loads is studied.A coordinated allocation model of wind power and energy storage under the condition of high penetration of wind power and considering the response of the demand and ensuring the reliability of power supply for important loads is established.The objective functions of the model include the investment cost and operation and maintenance cost of wind power and energy storage,the incentive cost of demand response,the penalty benefit of non-response,the compensation for loss of load,the benefit of energy storage and demand response.The configuration of wind power and energy storage in distribution network is optimized on the premise of ensuring the reliability of power supply under important load.The simulation results verify the correctness and availability of the proposed coordinated configuration scheme for wind power and energy storage.(3)Reliability and overall scheme economy of distribution network planning under the condition of high penetration of wind power.The multi-stage dynamic programming method for wind power and energy storage in distribution network considering demand response is studied.The time series matrix and operation matrix of demand response resource,wind power and energy storage are established to describe the increasing mode of demand response of distribution network and the temporal correlation between wind turbine and energy storage in construction planning.A multi-stage coordination optimization model of wind power and energy storage in distribution network is established considering the demand response and the time sequence of wind power and energy storage construction.The optimal objective of the model is to minimize the integrated cost of wind power and energy storage in the planning period of distribution network.Considering the influence of demand response on the coordinated allocation of wind power and energy storage,the multi-stage coordinated allocation of wind power and energy storage in distribution network with demand response is realized.The simulation and comparison of IEEE-33 standard distribution network example system show that the proposed model and the proposed method are feasible,effective and practical.(4)The evaluation method of the capacity credit of the combined wind power and energy storage system of distribution network considering the demand response is studied.According to Baleriaux-Booth formula,the capacity credit of wind power and energy storage combined system of distribution network considering demand response is defined.The influence of demand response on the capacity credit of wind power and energy storage combined system in distribution network is analyzed,and the reliability evaluation index for the capacity credit of wind power and energy storage combined system in distribution network considering the demand response is proposed.Based on the equivalent firm capacity(EFC)evaluation method,the capacity credit of the combined wind power and energy storage system in distribution network with demand response is quantitatively evaluated.An example is given to verify the practicability of the proposed method.