| The energy crisis and environment deterioration problems urge people to accelerate the energy transformation processes,and building Energy Internet is the key to solve these two outstanding problems.Micro energy grid is a natural extension of the microgrid concept and the nerve terminal of Energy Internet,which has been considered as an effective method to realize energy conservation and emission reduction,improving energy efficiency and promoting the local consumption of renewable energies.Since coupled with multiple energy carriers and all kinds of energy converters and storages,micro energy grid can realize multiple energy complementary and electricity substitution,which is considered an important approach to implement Comprehensive Demand Response(CDR).Under these backgrounds,this dissertation is focused on the Multiple Energy Complementary-Micro Energy Grid,and the main contents are as follows.(1)A matrix modelling method of energy flows of micro energy grid is proposed based on the graph theory and the energy bus architecture.Firstly,the key equipment models are established.Then,the essential definitions for modelling,the construction method for directed graph of energy flow and the matrix modelling processes of energy balance equation have been proposed.Finally,the matrix modelling method is used in the optimal operation problem to demonstrate its practicability and effectiveness.(2)The comprehensive demand response models of micro energy grid are built based on their optimal operation models,including the comprehensive demand response models of residential and community micro energy grids.The comprehensive demand response strategies are also discussed.The comprehensive demand response of community micro energy grid is investigated through four different cases,and the simulation results demonstrate the advantages of micro energy grid on multiple energy complementary,promoting renewable energy consumption,and energy conservation and emission reduction.(3)The comprehensive demand response is modeled from three levels,namely the interactions between micro energy grid and power/gas distribution networks,the optimal operation of micro energy grid and the flexible power/cooling/heating demands of end users.One definition of Electricity Self-Sufficient Ratio(ESSR)has been proposed,which can quantify the electricity self-sufficient level of micro energy grid.Based on these,the comprehensive demand response based on the adjustments of ESSR is proposed.Then the comprehensive demand response program is verified and discussed on the joint simulation platform of MATLAB and OpenDSS software.(4)The comprehesive demand response based on dynamic energy pricing is proposed under the context of multi energy market.Firstly,the comprehesive demand response architecture composed of multi integrated energy providers,multi micro energy grid operators and one independent integrated energy system operator is constructed.The dynamic energy pricing method is constructed based on the gradient projection method.In order to ensure the privacy security,the Distributed Gradient Projection Iterative Algorithm(DGPIA)is proposed to solve the dynamic energy prices and the optimal operation strategies of the interactive participants. |
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