The Research On Optimum Configuration And Control Technology Of Optical Storage Microgrid

At present,photovoltaic power generation is becoming more and more widely used.However,due to the intermittent and volatility of distributed photovoltaic output,adding energy storage devices has become one of the effective measures to improve the operation of distribution networks.The demand-side response can reduce the configuration of the energy storage capacity and improve the economic benefits of the optical storage microgrid.Therefore,studying the demand-side response of multiple time periods has important implications for the configuration of photovoltaic microgrids and energy storage systems.To enable the smooth operation of the optical storage microgrid,small power fluctuations,high user satisfaction,and high photovoltaic penetration rate,the primary problem to be resolved is the optimal configuration of the optical storage microgrid,the second is to study the control technology of optical storage microgrid.This thesis first establishes an optimal configuration model for optical storage microgrid based on demand-side response,which includes the transfer load demand-side response model and the time-of-use electricity price demand side response model.The goal of transfer load is to increase the PV penetration rate and reduce the use of energy storage devices,but the difference in load peaks and valleys will increase and the reliability of electricity consumption will decrease.The goal of the time-of-use electricity price demand side response is to reduce the load peak-to-valley difference and improve the reliability of electricity use.However,the penetration rate of PV will decrease,energy storage devices will need to be added,and the economy will be affected.Therefore,this thesis proposes an optical storage microgrid optimization configuration model considering the time-of-use price in the case of transfer load,and combines the two demand-side response models,namely the user-integrated load response model.In addition,the cooperative game plays an important role in optimizing the configuration as a mathematical theory and method for studying cooperation and competition.Based on this,in the demand side,a cooperative game method is used to optimize the configuration of the two response modes and the energy storage system,and an iterative algorithm is used to find the optimal configuration of the tripartite,so as to maximize the revenue and optimal reliability of the microgrid.According to the above content,the optimal operation strategy of the optical storage microgrid is proposed,and a typical example is verifiedand analyzed,which proves the validity of the proposed model and strategy,and provides a certain reference for the operation of the microgrid in the electricity market.Then the optimization control strategy of the optical storage microgrid is studied and the control strategy of the grid-connected inverter is proposed.Based on this,the overall structure of the optical storage microgrid system and the coordinated control of the system are simulated and analyzed.Finally,the research on microgrid off-grid handover technology is studied,and the traditional dual-mode off-grid handover and traditional single-mode off-grid handover are analyzed.There are certain deficiencies in the above handover process,therefore,a microgrid with improved adaptive nonlinear droop curve and off-grid switching technology was proposed.The experimental simulations verify the validity of the proposed strategy.