Capacity Configuration And Control Of Multiple Energy Storage Stations Combined Wind Power Participating In The Black-start

With increasing dependence on electricity,the economic and social losses caused by the blackout are becoming more and more serious.To reduce losses,the power grid needs to be quickly restored.As the primary process of power grid recovery,the key of black-start is to start the black-start power source.Although traditional black-start power sources give priority to hydroelectric generation,it is not suitable for areas with much wind and little water.With the significantly increasing proportion of wind power generation in the power grid,it is of great value to study wind power as the black-start power source in regions with abundant wind power resources and large installed wind power capacity.Due to the randomness and volatility of wind power generation,the energy storage system has become an important part of wind power generation stably participating in the black-start.In recent years,a number of energy storage power stations have been built in Gansu province,Jiangsu province and other places.The multiple energy storage state has been formed.In order to give full play to the key role of multiple energy storage power station in the black-start of wind power,it is necessary to establish a scheme with multiple energy storage systems assisting wind power to participate in the black-start.And the optimal configuration and the coordinated control strategy of multiple energy storage systems should be designed.Firstly,the black-start scheme of wind power based on multi-energy storage system is designed.According to the black-start test norm,the scheme of wind power participating in the black start was developed.And the black-start power sources,path and power plant to be started are determined.The feasibility of the proposed technical scheme is analyzed from the aspects of self-starting capability and output reliability.Then,the capacity configuration method of wind power and energy storage system as black-start power is proposed.The shortcomings and problems of the existing energy storage configuration are analyzed.Based on the minimum wind speed of black-start,the probability density of minimum wind speed and the probability inclination of optimal wind speed are defined,which can evaluate and determine the wind farm from numerical value,time and effective utilization of resources.Secondly,wind power prediction is used to determine the wind power during the black-start period.And the capacity and maximal chargeable/dischargeable power of the energy storage power station are determined,which lays a foundation for the coordinated control strategy of multiple energy storage in the next chapter.Simulation is used to verify the black-start feasibility of the configuration scheme.Finally,a coordinated control strategy of multi-energy storage supporting black-start based on dynamic power distribution is studied,which is divided into two layers.Combining the energy storage chargeable/dis-chargeable mode and the energy storage control mode,the power computational distribution layer divides the energy storage systems into 24 operating modes by establishing the working partition of state of charge of ESSs.Then,aiming at the power distribution problem of each energy storage power station,an adaptive multi-energy storage dynamic distribution model is proposed.The power tracking control layer adopts the control strategy combining V/f and PQ,which can complete the optimal allocation of the upper the power instructions among energy storage power station and feedback the real-time SOC to the power computational distribution layer.Finally,PSCAD/EMTDC is used to establish the black-start simulation model of wind power and energy storage.Compared with that without adaptive adjustment and average distribution,and the effectiveness of the proposed coordinated control strategy is verified.