Research On Distributed Efficiency Optimization Control Of DC Microgrid

Microgrid technology represents the development trend of distributed energy technology and is an important part of the future power distribution system.Compared with the AC microgrid,the DC microgrid requires less conversion equipment,higher energy utilization efficiency,and has broad development prospects.In recent years,with the application of DC microgrid in more fields,higher requirements have been put forward for system operation efficiency.How to improve the operation efficiency of DC microgrid has always been the focus of the research field of DC microgrid,and it is also a difficult problem.The thesis focuses on the following researches on the optimization of DC microgrid efficiency.Firstly,the analysis shows that the power loss caused by the DC-DC converter and line impedance is the main factor affecting the operating efficiency of the DC microgrid.On this basis,the power loss model and efficiency model of the DC microgrid are established,and the DC microgrid efficiency optimization problem is solved by constructing a lagrangian function to solve the necessary conditions for the optimization problem to obtain the optimal solution,that is,the global transmission incremental power loss of each DC-DC converter in the DC microgrid is consistent,and this is taken as the control objective of the distributed efficiency optimization control strategy.Secondly,in view of the traditional droop control and the adaptive droop control strategy based on the discrete consistency algorithm,the problem of low system operation efficiency caused by the power loss in the system is not considered,and the distributed hierarchical optimization control architecture of the DC microgrid is constructed,and the discrete consistency algorithm is applied.Algorithm,a DC microgrid distributed efficiency optimization control strategy based on discrete consensus algorithm is proposed.A four-node DC microgrid system model is built in MATLAB/Simulink.The simulation results show that the proposed distributed efficiency optimization control strategy is effective improve the operating efficiency of the DC microgrid.Finally,considering the impact of the convergence speed of the consensus algorithm on the performance of the distributed efficiency optimization control strategy,this paper further studies the communication network topology of the DC microgrid,adopts a double-hop network topology,and proposes a DC microgrid based on the fast consensus algorithm.Power grid distributed efficiency optimization control strategy.A four-node DC microgrid system model is built in MATLAB/Simulink.The simulation results show that the proposed control strategy effectively improves the performance of the distributed efficiency optimization control strategy.