| At present,new energy power generation has entered the stage of large-scale application,and a large number of distributed wind and solar new energy have poured into the distribution network.The random volatility of new energy output causes severe power disturbances in the distribution network,which not only affects the voltage quality of the distribution network itself,but also a large amount of disturbances transmitted to the main grid will increase the operating pressure of the main grid.With the continuous increase of the load of the power distribution network in China,the test of the stability of electric energy is also getting larger and larger,and the mobile energy storage system can effectively improve the stability,reliability and economy of the power system,which has become a major development in the power industry.trend.In order to reduce the random uncertainty of new energy power generation and lead to strong power disturbance of the distribution network to the main grid,and improve the multi-level orderly capacity of new energy in the power system,it is proposed that the new energy distribution network use energy storage stations and controllable resource implementation areas Transmission and distribution coordination and consumption strategy of internal self-regulation.Based on the new project of a 10 k V switching station in Qinhuangdao,this paper studies the self-discipline operation strategy of using the mobile energy storage system and the controllable resources of the distribution network to stabilize regional power disturbances based on the self-discipline management and control of distribution network.First,according to the two important loads of the opening and closing station,the capacity requirements of the energy storage power supply were calculated,and the lithium iron phosphate battery was selected as the energy storage element,and the main circuit of the energy storage system,the energy storage charging and discharging circuit,and the system support were completed.Circuit design analysis and system layout planning,and simulation of the system’s charge and discharge working modes under on-grid and off-grid working modes.A method to estimate the state of health of the battery through the real-time data of the state of charge change,capacity change,and open circuit voltage when the battery is charged is proposed.At the same time,the operation strategy of the energy storage system under two typical operating conditions of emergency power supply and peak-cutting and valley-filling is discussed to improve the efficiency of electric energy utilization and improve the power supply capacity at the end of the distribution network.Then,the regulation mode of the self-regulation operation of the distribution network is expounded,and the self-discipline operation indicators describing the distribution network region and related calculation methods are established from the short,medium and long time scales.On this basis,the self-regulation operation indicators of the distribution network are used as the criterion,Put forward short-scale energy storage station power disturbance suppression strategy and based on energy storage,demand-side response(Demand Response,DR)and network reconstruction means of medium and long-term distribution network self-regulatory operation strategy;for reasonable adjustment of energy storage For the state of charge of a station,a correction strategy for regional energy storage stations to improve the state of charge is proposed.Finally,a regional distribution network in Hebei Province was used as an example for simulation analysis to verify the effectiveness and rationality of the method. |
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