Research And Implementation Of Energy Management Strategy And Data Transmission Of Distributed Grid-Connected Photovoltaic

Under the current rapid development of distributed new energy,how to better monitor,collect,transmit,manage and maintain the equipment in the grid-connected photovoltaic power station,and ensure the safe and reliable operation of large-scale,high-permeability distributed renewable energy.Flexible and efficient grid connection has become a research hotspot.With the support of the National Key Research and Development Program 1.3 Jinzhai Renewable Energy Power Generation Cluster Grid-Connected Demonstration Project,this paper studies the above problems,and proposes a distributed photovoltaic grid-connected energy management control algorithm and a layered data transmission system to realize the unified monitoring and regulation of distributed photovoltaic power plants.Firstly,this paper takes the distributed photovoltaic grid-connected system of agricultural weak grid as the research object and designs the photovoltaic grid-connected energy management and data transmission system.According to the characteristics of each level of clusters in the weak grid of the rural power grid,the overall function and performance requirements of the system are studied and analyzed in detail,and the system physical model and software model are built.For the characteristics of the nodes in the distribution network area of the rural power grid are widely distributed and the geographical environment is complex,a hierarchical data transmission architecture combining low-voltage power line carrier communication and wireless broadband private network transmission is proposed.Secondly,on the one hand,from the perspective of combining grid-connected photovoltaic inverters with photovoltaic energy storage,a local adaptive layered coordination and grid voltage control strategy is proposed,which fully considers the active/reactive adjustable margin of photovoltaic inverters and effective use of photovoltaic energy storage coordinated control,so that the photovoltaic inverter always works in the optimal power output state.On the other hand,in the context of the distributed PV power plant meeting the scheduling requirements of the group control of the upper-level main station,in order to realize the optimal power output of grid-connected photovoltaic inverters and the flexible and efficient grid connection of distributed photovoltaic power sources,a short-term power forecasting method and intelligent scheduling control strategy for distributed photovoltaic power plants are proposed,which automatically analyzes and optimizes the execution of higher-level scheduling commands.Besides,the Matlab/Simulink simulation model was built and analyzed separately.Finally,in order to realize the distributed photovoltaic grid-connected energy management control algorithm proposed in this paper,the energy management intelligent measurement and control terminal is developed and designed,and the hierarchical coordinated and grid voltage control strategy and intelligent power scheduling control strategy proposed in this paper are integrated to assist human-computer interaction,superior schedule communication and other functions.It has been verified and applied in the demonstration project of grid-connected consumption of renewable energy power generation clusters in Jinzhai.