Research On Optimal Coordination Control Strategy Of Multi-microgrid

In order to alleviate the increasingly prominent energy and environmental problems,the microgrid technology based on clean energy has been extensively researched and applied.At present,micro-grid technology mainly exists in the form of single micro-grid and multi-micro-grid,and the multi-micro-grid system is the main trend of future microgrid technology development.However,due to the complex networking form and operation mode of the multi-microgrid,there are problems such as the rationality of electric energy interaction and the stability of coordinated operation,so it is urgent to study and formulate the corresponding multi-microgrid optimized and coordinated control strategy to realize the multi-microgrid system Overall stable economic operation.The main work of the thesis includes the following aspects:(1)Design of the overall control system for multi-micronets based on energy routers.First of all,this article describes the researched multi-micronet system networking architecture.Secondly,the operation mode and switching conditions of the multi-microgrid system are analyzed.Finally,on this basis,a multi-microgrid overall three-layer control system is designed,and the control objects and tasks of each layer are analyzed,which lays a theoretical foundation for subsequent research on optimized coordinated control strategies.(2)Multi-microgrid optimization scheduling strategy based on power mutual aid.First of all,a multi-microgrid electric energy trading mechanism was developed with the idea of power mutual aid.Secondly,under this trading mechanism,a two-tier optimal scheduling model is established,and the improved gray wolf algorithm is used to solve it.Finally,a simulation example verifies the rationality of the optimal scheduling strategy proposed in this paper.At the same time,it is compared with the other two algorithms,which shows that the strategy proposed in this paper can effectively achieve good electrical energy interaction in the multi-microgrid system and has a comprehensive economy.The cost is lower.(3)Multi-microgrid coordinated control strategy based on virtual synchronous motor.First of all,through the analysis of the multi-microgrid power mutual aid scenario,the corresponding coordinated control strategy is worked out.Secondly,using fuzzy PI control and improved particle swarm algorithm to improve and optimize the traditional virtual synchronous motor control.Finally,simulations verify the effectiveness of the coordinated control strategy proposed in this paper.At the same time,it is compared with the other two control methods,which proves that the strategy proposed in this paper can effectively suppress the frequency and voltage fluctuations of the multi-microgrid system during power mutual assistance.And the response time is shorter,and the control effect is better.(4)Application and analysis of multi-microgrid experimental platform.Firstly,the constructed experimental platform of energy internet is explained.Secondly,apply and analyze the multi-microgrid optimized and coordinated control strategy proposed in this paper.Finally,the verification of actual cases and the analysis of experimental results show that the optimized coordinated control strategy has good controllability and practicability,and provides key technical support for the development of microgrids in the future.The paper has 60 pictures,15 tables,and 81 references.