Optimized Operation Of Integrated Electric-Thermal Energy System With Integrated Demand Response

With the contradiction between fossil energy crisis,environmental pollution and the rapid development of human society and economy gradually deepening,how to solve this contradiction will be the focus of future energy system research.As a new type of energy system that can closely coupling multi-energy flow network,integrated energy system can realize "multi-energy complementarity and source network load coordination" through two-way conversion of multiple heterogeneous energy.As a derivative of traditional power demand response under the background of energy Internet,integrated demand response is an important means to realize load peak-load filling and load flexibility.Therefore,it is of great significance to study the establishment of integrated energy system model and its optimized operation mechanism to improve energy utilization rate,reduce carbon emission pressure and increase the permeability of new energy.Based on the electric-thermal energy network,this paper establishes a comprehensive electric-thermal demand response model and its response mechanism and strategy,and conducts in-depth researches on the optimization operation of regional electric-thermal integrated energy system with comprehensive demand response in mind,as well as the layered coordinated optimal control under multi-micro network access.The main contents are as follows:(1)The energy flow network and system "source" layer equipment model of regional electric-thermal energy system are established.In this paper,the electrical and thermal energy system model is divided into the power grid,heat supply network and energy equipment three parts,on the basis of fully considering the energy characteristics of equipment operation,coupling structures,the regional power flow meter and the network loss model and the characteristics of the meter and heat supply network transmission delay with piping model,as the research basis of electrical and thermal energy system optimization.(2)A dispatching model of the electric-thermal integrated energy system including distributed power supply is proposed.The dispatching potential of power load demand response should be deeply explored,and different thermal load response mechanisms should be established according to the fuzzy characteristics of human body’s temperature perception and the demand characteristics of industrial thermal load in heating load,so as to stimulate the potential of electric heating coordination of thermal flexible resources under time-of-use electricity price.On the basis of minimizing the total operating cost of the system,the simulation examples compare and analyze the system economy under different scheduling strategies,and prove the rationality and optimality of the proposed scheduling model.(3)A hierarchical optimization scheduling method of power-thermal integrated energy system with multi-agent microgrid is proposed,and the uncertain risk cost of source load in microgrid is quantified based on the conditional value at risk theory.The objective cascade method can decompose the global optimal problem of traditional centralized dispatching into multiple sub-problems,and the sub-problems can optimize the dispatching independently,so as to refine the interest game between the regional power-thermal energy system layer and the micro grid.Value-at-risk cost function is introduced to provide a risk running scheme for system scheduling.Finally,an example is given to verify the optimality and rationality of the proposed hierarchical optimal scheduling method compared with the global optimal centralized scheduling method.