| In the context of the rapid development of large-scale renewable energy,the largescale energy storage technology is widely considered as the most effective means to improve the electric quality and security.In the existing energy storage technology,advanced adiabatic compressed air energy storage(AA-CAES)technology has broad application prospects because of its advantages of low pollution,low investment,flexible site selection and large capacity.However,the lack of an in-depth understanding on AACAES dynamic characteristics has seriously limited the development of system design and control strategy,resulting in that the large-scale CAES system has not been put into commercial operation yet.This paper describes the design and implementation of a AACAES plant and its controller for applications in the distribution network level.The dynamic mathematical models of AA-CAES were established and a feasible control strategy for the grid-connected process was developed in this paper to analyze the dynamic characteristics of the system.The optimized control strategy obtained through typical response provides an effective reference for the design and specification of AACAES,which overcomes the technical problems of aa-caes unit regulation,system integrated control and grid connection and has important practical significance for promoting the application.These works provided a data reference for the deeply understanding of the dynamic characteristics of AA-CAES,system design and control strategy in industry.it promotes the successful application of AA-CAES technology to the development and popularization of power and industrialization,has important theoretical significance and engineering application value.The model and research results in this paper provide an important basis for further understanding the dynamic characteristics,system design and control strategy of aa-caes system.The main content of this paper:1.In this paper,the dynamic mathematical model of AA-CAES is established by referring to the 10 MW non-supplementary combustion supercritical compressed air energy storage demonstration project,and combining with the relevant system parameters in the existing literature.Based on the modular modeling idea and APROS simulation support platform,the AA-CAES system simulation model was established based on its system structure diagram.The energy storage process valve control,speed control,power control,island operation,primary frequency modulation,load rejection process speed control models are constructed.2.We analyzing the dynamic response of charge and discharge process in AACAES system,we proved that the model can reflect the system correctly by comparing the design data with the simulation data,the model can reflect the dynamic characteristics accurately and the variation trend of thermal parameters conforms to the mechanism of the system.In addition,the model operated steadily and reliably,with high dynamic and static accuracy.It can lay a reliable foundation for the study of system dynamic characteristics and grid-connection.3.This paper designed a CAES plant and its control strategy for applications in the distribution network level.A feasible control strategy for the grid-connected process was developed in this paper to analyze the dynamic characteristics of the system in the discharge stage.4.The control models of the energy storage system in the rushing,grid connection,power regulation,load shedding and primary frequency modulation process were established.The power control performance and power-frequency adjustment capability of the designed speed control system was analyzed through simulation test.The optimized control strategy was analyzed by the response under typical disturbances,which provided an effective analysis tool and data reference for the deep understanding of dynamic characteristics,design and control parameter setting of the CAES system.5.An optimized load rejection process control strategy is put forward.By comparing the maximum speed value of the optimized scheme and the original scheme,it can be obtained that the improved load rejection speed regulation system has a better regulation effect,which can effectively prevent the speed from soaring and increase the safety and stability of the system. |
