Research On Economical Operation Optimization Of Microgrid Based On Demand Side

The economic benefits that micro-grid brings is the key factors to draw subscribers and promotion in the power system. Micro-grid contains a variety of types of controllable micro power supply, so how to arrange these micro power operation plan, keep the micro-grid in different time Meet the requirements of the load, and realize the economic operation of the microgrid is one of the important contents in the micro-grid research. However, with the further development of the modern power system, the interests of the main micro-grid operation is also positive to the direction of diversification.Therefore the demand side resource management gets more attention.First of all, this paper analyzes the principle of micro-grid economic operation.on the basis of this, the micro grid economic dispatch model of the demand side of is proposed.Model composed of two layers, upper mainly build micro grid operation optimization model;lower according to the upper layer gives a personalized electricity price, the load transfer, and the optimized load demand data provided to micro grid. According to the output data,Micro-grid will re-optimize the micro grid internal controllable micro power supply.This loop iteration could ultimately achieve the win-win situation.Secondly, using the multivariate linear regression model,The electricity-price response curve of various-users was fitted according to the all kinds of statistical data.Base on the electricity-price response curve design the adaptive price of electricity, realize the load curve improvement.Again, construct a specific dynamic scheduling of micro-grid model based on chance constrained programming aim for the minimum operating cost and maximum node voltage deviation of power generation side. The clonal selection algorithm(CSA) has been improved and this improvement algorithm has faster convergence speed.To solve the model, take the probabilistic load flow and clonal selection algorithm combination of methods, load flow method based on semi-invariant and Gram-Charlier series for micro-grid is used to judge whether the planning scheme satisfies the chance constraints.Combined the application of hybrid mutation strategy of fixed step and variable step length to improve the search performance of the CSA and the diversity of the Pareto optimal solutions. Finally, the paper uses fuzzy membership function to solve the selection problem of Pareto optimal solution.Finally, construct the model as the basis, combined with the example, carries on the simulation analysis for the two cases implemented or not implemented demand side management(DSM) more intuitive response to the economic benefits of the implementation of DSM. At the end of the micro grid operation mode optimized analysis, verify the rationality of the proposed model.