| With the continuous development of the world economy,the problems of energy and environment are becoming more and more prominent.Renewable energy resources have become an essential part of the energy strategy of various countries.In recent years,distributed generation technology is becoming more and more mature.Because of its advantage in flexibility,cleanliness,economy and so on,it has been on a large scale grid connection.However,because the DG has the characteristics of volatility and intermittence,its large-scale grid connection will make the operation,transformation and construction of the power system more complex.Meanwhile,the interaction of the load,as the demand side resource,and the power grid is increasing gradually,which provides a new solution to solve the fluctuation of DG.Therefore,the demand side response analysis and the comprehensive evaluation system development of power grid including DG have extremely important theoretical significance and engineering value.In this paper,the application of demand side response in smoothing wind power has been studied.From the perspective of demand response,this paper proposes a layered method for smoothing the wind power fluctuation.This method establishes the time-of-use electricity price model and the model of the shiftable load with multi-time scales.On this basis,by using economic heuristic rules,this paper establishes optimization models of wind-load and wind-storage.According to the characteristics of the shiftable load in different time scales,this paper presents a layered optimization strategy which gives the target curve and the corresponding solving algorithm in each layer.With the example system,the effectiveness and smoothing effect of the layered optimization scheduling strategy are verified and analyzed.Secondly,this paper studies the factors of DG accessed to distribution network and the comprehensive evaluation system function.Based on the factors of economy,reliability and voltage quality,a comprehensive evaluation index system has been established.The functional framework of the comprehensive evaluation system has been set up which can calculate and analyse the influence factors of distributed power accessed to the distribution network with the algorithms of power flow/random power flow calculation,random production simulation and reliability analysis.Comprehensive evaluation model of satisfaction has been established based on comprehensive evaluation algorithm module and the alculation method of the weight coefficient of three-level index and comprehensive weight coefficient,which can effectively evaluate the impact of different distributed power accessed ton distribution network.Finally,based on the above comprehensive evaluation index system,the three level weight system and the calculation method,a visualized comprehensive evaluation system is developed.Based on the development platform of Microsoft Visual.NET,the infrastructure that includes the view layer,the data layer and the algorithm application layer is established.The algorithm modules including optimal configuration,power flow/random power flow calculation,random production simulation,reliability analysis and other algorithms are studied and developed.Based on the economic index,reliability index and voltage quality index calculated by algorithm calculation module,the comprehensive evaluation index is integrated into the comprehensive evaluation system.The main functions and use methods of the system are demonstrated through practical cases. |
