Research On Energy Storage To Improve The Power Quality Of Micro-grid Based On DSP

In order to cope with the energy crisis and optimize the energy structure,DC micro-grid has been developed rapidly in recent years.A series of key technologies related to DC micro-grid have become the research hotspots.Power quality analysis and control of DC micro-grid is one of the key technologies.Because of the particularity of the DC-PON system,its power quality is closely related to the operating characteristics of internal distributed power supply.energy storage device and load.Based on the characteristics of micro-grid,this paper uses hybrid energy storage to conduct comprehensive management of DC micro-grid power quality.This paper focuses on the power quality control of DC micro-grids,mainly in the following aspects.Firstly,the background and research significance of micro-grid are introduced.The research status of micro-grid at home and abroad is introduced,including the access of new energy to micro-grid,the study of micro-grid operation state control and the improvement of micro-grid power quality.Secondly,this paper introduces the hybrid energy storage structure and its control strategy,and introduces the energy storage methods commonly used in micro-grids,including super capacitor energy storage,battery energy storage and flywheel energy storage.On this basis,The control circuit of hybrid energy storage is the topological structure and operation principle of bidirectional DC/DC circuit.After introducing the basic circuit,the closed-loop control circuit of bidirectional DC/DC circuit is designed according to the characteristics of different energy storage.Finally,the causes and countermeasures of power quality problems of DC micro-grid are studied.The influence of distributed power on DC micro-grid including solar cell and wind turbine is studied emphatically.The influence of large load and impact load on the DC micro-grid power quality The impact of DC micro-grid operation on the power quality of DC micro-grid.After analyzing the cause of power quality problem in DC micro-grid,the conclusion is drawn that the problem of power quality of DC micro-grid is reduced to DC bus voltage,and the scheme of DC power grid voltage quality identification is proposed.Based on this,the DC bus voltage detection method is studied,including the Fourier transform theory adaptive detection theory,wavelet detection theory and other detection methods,and finally determine the use of voltage real-time tracking and wavelet detection of the way to detect the DC bus voltage problem And put forward the DC micro-grid power quality control program.According to the different characteristics of the super capacitor and the battery,the design of the DC micro-grid can not only exert the advantages of the energy storage elements,but also improve the performance of the DC micro-grid.Can control the energy storage components running in the safety zone of hybrid energy storage unit energy management methods to extend the service life of energy storage components,while improving governance.In order to verify the feasibility of the scheme proposed in this paper,a simulation model is built in the Matlab/Simulink environment.The simulation model covers micro-source,hybrid energy storage,and various loads.The results show that the proposed control scheme can effectively suppress the above-mentioned power quality problem.The results show that the proposed control scheme can suppress the above-mentioned problem of power quality,Problem,you can ensure the stable operation of DC micro-network.Finally,the feasibility of a simple simulation experiment is verified through the hardware platform based on embedded DSP.