Research On Multi-source Micro-grid Modeling And Energy Management Technology

With the increasing adverse impact of traditional energy on the environment and the increasingly prominent drawbacks of traditional power networks,distributed power generation technology based on clean energy has been developed in a blowout.As an organizational structure mode of distributed power generation,micro-grid can better play the advantages of distributed power generation and is a powerful complement to large power networks.It has received wide attention.The economic optimal dispatch in the microgrid energy management can effectively improve the energy utilization rate and reduce environmental pollution,which is of great significance to the reliable economic operation of the system.Therefore,the research on the energy management of microgrid has become the focus of the current microgrid technology research.Firstly,this paper systematically discusses the composition structure and related conceptual theory of the multi-source microgrid,studies the basic mathematical models and simulation models of all kinds of power generation and storage systems used in this paper,and models the above systems using the matlab/simulink Modular Simulation software.Then,on the basis of the above system simulation models,the network model of multi-source microgrid is established,and the simulation model is set up with operational parameters and case design to verify its feasibility and correctness.Secondly,for the optimal dispatch of microgrid energy management,considering the five parts of microgrid investment annual cost,fuel cost,operation and maintenance cost,environmental cost,and interaction cost with the large grid as the objective function,the power balance constraints in the operation process,the output power limit constraints of each micropower source.The constraints of exchange power constraints and storage battery operation constraints between micro-grid and large-grid are established,an economic optimal dispatch model containing the above micro-power sources is established,and a specific dispatch strategy for multi-source micro-grid in parallel operation mode is formulated.The dynamic optimization problems such as non-linearity,multi-objective and multi-constraints in multi-source micro-grid economic dispatch are addressed.An improved cuckoo search algorithm is presented,which improves the local search formula of the traditional cuckoo search algorithm,and pays attention to the use of high-quality information between nests.Finally,a specific example of multi-source microgrid is used for simulation analysis,and an improved cuckoo search algorithm is used to solve the example model to obtain the optimal output of each micropower source in a typical day optimization cycle,and compared with the traditional cuckoo search algorithm and particle swarm algorithm.The results show the effectiveness and feasibility of the improved algorithm and scheduling strategy.