Research On Economic Dispatch Optimization Of AC-DC Hybrid Microgrid

AC-DC hybrid microgrid can effectively integrate the advantages of AC microgrid and DC microgrid,therefore,it can not only meet the diverse needs of power users,but also save energy,reduce loss,and increase the operation and regulation level of whole power system.And it has become one of the development hotspots of microgrid techology.AC-DC hybrid microgrid has the advantages of AC microgrid and DC microgrid,which can reduce the overall system cost,improve the operation efficiency of microgrid as well as the renewable energy consumption rate,and therefore it has the characteristics of energy saving and environmental protection.However,the research of AC-DC hybrid microgrid is still in the initial exploration stage,and related theory as well as technology are not mature,many problems need to be solved.Economic dispatch can exert the full advantages of AC-DC hybrid microgrid,which is a key subject in the field of microgrid research.Carbon trading mechanism meets the low carbon economy concept,and is related to the sustainable development strategy.Introduce the carbon trading mechanism into the economic dispatch of AC-DC hybrid microgrid,the carbon emissions of the system can be reduced on the basic of economical efficiency,which is a win-win result.This paper studies the economic dispatch method of AC-DC hybrid microgrid.The background and significance of this research are introduced.The development of AC-DC hybrid microgrid is summarized.The concept of carbon trading mechanism and the initial allocation mode of carbon emission right are studied.The initial quota of carbon emission of AC-DC hybrid microgrid is established,and the calculation method of carbon trading volume of AC-DC hybrid microgrid is designed based on the characteristics of controllable microsource emission reduction.The mathematical models of microsources,energy storage and converters are established,and on this basic,the economic dispatch model of AC-DC hybrid microgrid is set up.Based on the features of this optimal problem and AC-DC hybrid microgrid,the coevolution improved black hole algorithm is proposed.In this algorithm,the complicated optimization problem is split into two relatively independent simple sub-problems by the coevolutionary framework,and the improved black hole algorithm is used to settle sub-problems,therefore,the hybrid intelligent algorithm can achieve the overall improvement of calculation speed and convergence accuracy.The economic dispatch scheme of AC-DC hybrid microgrid is got in the simulation example,which varify the effectiveness of the proposed dispatch model and optimization method.Besides,the impact of the introduction of carbon trading mechanism and consideration of the bidirectional converter loss for the economic dispatch of AC-DC hybrid microgrid are compared.The simulation results show that equal weight dispatch strategy has better economic and environmental protection,and the using of the bidirectional converter loss model changes controllable microsources output and the power flow of AC area and DC area,thus is more applicable for the real needs.