Research On The Control Strategy Of Micro Grid Storagy System Based On Photovoltaic Power And Load Forecasting

With the development of global economy, energy demand rising year by year, energy crisis and ecological environment problems increasingly prominent. Although the renewable energy sources like solar and wind power on a large scale application can efficetively relieve the energy crisis and ecological environment problems.But the power which prodected by the renewable energy like solar and wind is not stable, would influence the stable and equality of the grid, the emergence of the micro-grid can effectively overcome the defects of it, so the research on micro-grid has important significance. Energy storage system as an energy buffer link, has the pivotal status in the micro-grid.At first, this paper introduced energy storage technology applied in micro-grid, and expounds the classification and applications of the battery, analyzed unitized design method and its conventional inverter main circuit topology structure, and according to the funcition of smooth the fluctuations and energy scheduling of the energy storage system in micro-grid it can be divided into two scenarios as smooth output control and planning work output control. According to the design requirements of photovoltaic micro-grid, the control strategy of plan output is put forward based on the energy prediction.Secondly, set up the prediction model of photovoltaic power and the load with least squares support vector machine, through the analysis of the history data, selecting the main factors which affecting the photovoltaic output as input variables of prediction model. And the load forecast model is established, it introduced the grey correlation degree analysis method to choice the main influence factors as the input variables, thus can improve the accuracy of prediction model.Finally, based on the photovoltaic power and load prediction, put forward a fuzzy control strategy of energy control system. Then analysing the basic principle of fuzzy control and its advantage, and designing fuzzy controller, and determine the fuzzy controller structure and input/output variables of fuzzy controller, and the language tables and fuzzy reasoning rules are established, and the fuzzy control rules in the system is tested. The results show that the fuzzy control strategy can improve the efficiency of the system, and reduce the power loss by power exchange and inhibition of the micro grid power fluctuations, thus to To reduce the influence of micro power grid of public power grid.