The Research On Micro-grid Economic Dispatch Corrected Based On Forecasting Error

As the crisis of energy has come up, the concepts of DG(distributed generation) are proposed. At the same time, micro-grid which can be supplied by DGs is becoming a research hotpot. The research on dispatch of micro-grid is one of core study contents of micro-grid. This paper mainly studied the micro-grid under island mode.DG(distributed generation) is one of important parts of Micro-grid. The running characteristics of DGs is introduced in detail. In matlab/simulink, the simulation model of Photovoltaic Cells was built. In order to get cell’s output the max power curve,modify input module of the original simulation model and increase module of cell’s temperature, environment temperature and illumination. the photovoltaic cell’s engineering parameters, the photovoltaic cell’s temperature, S and mV are input. output power curve varying with time is simulated.Micro-grid economic dispatch model was built. It included the fuel cost, the maintenance cost and environmental cost. Constraint conditions contain power balance constraint,climbing constraint of generation unit and the output range of DGs. In this paper,the PSO(Particle Swarm Optimization) was adopted to solve the functions.WT is one of important DGs. Power forecasting of WT has different methods. Forecasting error is different through different methods. The forecasting error brings challenges to the economic dispatch of micro-grid. In chapter four, some common error distribution model were described. With specific examples, forecasting errors were obtained based on different model. To contrast the results with the actual error, more reasonable error distribution model was obtained.Then combined with example of micro-grid, dispatch result was got according to the method of micro-grid dispatch based on error correction. The result proves the model was effective. Wind energy source can be made full use of.In the chapter 5,mirogrid load and forecast method were introduced. In this paper,micro-grid load was obtained trough forecasting method based on similar days. With examples, the dispatch result was corrected based on load forecasting error. The corrected result indicated that the model was practical and valid.