Research On Operation Control Technology Of Smart Grid With Distributed Energy

With the introduction of the concept of smart grid,large-scale access of various distributed energy and energy storage units has made distributed energy supply technology widely used in power systems.The research focuses on the key technologies of intelligent microgrid based on distributed energy.The main research contents include microgrid integration technology based on distributed energy,integrated PV/storage operation control technology based on static synchronous generator characteristics,and microgrid energy management and coordination.Firstly,according to the different types of busbars in the microgrid system,the characteristics of the three different microgrids with AC,DC,AC and DC hybrids and their respective applications are analyzed and summarized.On this basis,the voltage level,bus structure,network topology and In the aspect of distributed power optimization configuration,the design problem of AC/DC hybrid microgrid is discussed.The integrated design technology of microgrid based on AC/DC aggregation is proposed.The distributed power supply location and capacity planning is carried out with the goal of minimizing the total annual cost of the microgrid system.Secondly,The parallel operation control method of optical storage system based on adaptive non-interconnected drooping characteristics is studied.The droop coefficient of each energy storage unit connected to it is adjusted according to the height of the bus voltage to stabilize the DC bus voltage.On this basis,the design and development of the optical storage integrated energy storage converter structure were carried out.The static test,grid-connected charge and discharge function test,off-grid constant voltage control function test and MPPT function were completed for the developed optical storage integrated system.Test and adaptive control function test of optical storage integrated system.Subsequently,the research on coordinated control technology of microgrid based on AC/DC aggregation was carried out,and the grid-connected coordinated control technology of AC/DC microgrid based on dynamic voltage support was proposed.The grid-connected points were monitored in real time,and the microgrid was calculated according to the voltage/power sensitivity analysis results.The active/reactive power adjustment amount controls the voltage within the optimization interval to achieve dynamic voltage support of the grid connection point.The micro-grid coordinated controller has been developed,which has micro-grid coordinated control functions such as micro-grid start control,shutdown control,off-grid operation control,grid-connected operation control,and off-grid switching.At last,based on the research of microgrid energy management technology,a new energy power prediction technology based on the optimization of environmental parameters of the underlying surface was proposed.Based on the power prediction results,a multi-time scale microgrid energy optimization management strategy was proposed,and a microgrid energy management system stucture was developed.The set has advanced application functions such as photovoltaic power generation and wind power prediction,short-term and long-term prediction of load,real-time state of charge calculation of energy storage,distributed power supply optimal operation scheduling under micro-grid economic operation,and optimized operation scheduling of energy storage devices.Through the research of this thesis,some key problems in the design and operation control of intelligent microgrid with distributed new energy are solved,which provides certain technical guidance for the safe and economic operation of smart microgrid.