Research On Multi-energy Collaborative Optimization Operation And Benefit Evaluation Model Of Micro Energy Grids

The Micro energy grid realizes the efficient integration and coordinated supply of multiple energy sources such as electricity,heat,gas and cold in a certain area through multi-energy complementary technologies and comprehensive energy services.In 2016,the China Development and Reform Commission put forward "Guiding Opinions on Promoting the Development of" Internet+ "Smart Energy".It is pointed out that it is necessary to strengthen the construction of a multi-energy coordinated comprehensive energy network and carry out the coupling,interaction and comprehensive utilization of different types of energy such as electricity,gas,heat and cold.The Micro energy grid group widely applies smart interconnection technology.As a smart regional network,it has a high penetration rate of new energy sources.Through energy storage and energy conversion,the energy supply and consumption in the region can be balanced.The Micro energy grid group can exchange energy according to actual needs,and can also flexibly interact with energy on the public network,realizing the optimized configuration of distributed energy such as wind,light,and natural gas.Therefore,this article takes the optimization operation of the Micro energy grid cluster as the research object,analyzes the development status of the Micro energy grid,focuses on the multi-energy collaborative scheduling optimization problem of the Micro energy grid,and evaluates its comprehensive benefits.The main research contents are as follows:(1)The energy characteristics of supply,conversion,storage and consumption of micro energy grid are analyzed.Combined with the characteristics of the energy Internet.this paper analyzes the functions of the micro energy grid;abstracts the evolution law of the structural characteristics of the micro energy grid based on the policy and practice pilot projects;models the supply,conversion,storage,consumption and other characteristics of the micro energy grid,and analyzes the cascade utilization of energy.(2)A collaborative optimal allocation method of integrated energy system considering demand response is proposed.From the perspective of system structure and unit equipment,this paper analyzes the comprehensive energy system model;analyzes different types of loads participating in the comprehensive demand response's ways,and establishes the comprehensive demand response model taking into account the stochastic cognitive uncertainty:constructs the "source network load storage" capacity allocation double-level planning model,the upper level optimizes the unit capacity with the goal of building the optimal economy of the comprehensive energy system.and the lower level optimizes the unit capacity with the goal of building the optimal economy of the comprehensive energy system At the same time,the efficiency of the model and method is verified by the example analysis.(3)A multi-energy coordination and complementary bi-level scheduling optimization model for Micro energy grids is proposed.A new micro energy grid structure is designed,and the energy production,energy conversion and energy storage device operation model of the micro energy grid is established.Based on the two stage optimization theory,the pre forecast power of the wind and day is taken as a random variable to construct the upper day scheduling model.The time front power is used as the realization of the random variable,and the lower time scheduling model is constructed.The search algorithm improves the traditional particle swarm optimization(PSO)algorithm.solves the model,and selects the international low carbon Park in Longgang District of Shenzhen City as an example.(4)A three-level optimization model of multi-energy collaborative interaction balance among Micro energy grids was proposed.First of all,with the goal of establishing the minimum average load loss rate,a model for optimizing the capacity flexibility configuration of the multi-micro energy grid is established.Then,the conditional value-at-risk is used to measure the risk cost caused by the uncertainty of wind power and photovoltaic,and a multi-energy coordinated intraday scheduling optimization model such as electricity,heat,and cold is constructed.Third,consider the backup supply cost of each entity(Micro energy grid,incentive demand response,upper-layer energy network)at different times,establishing a standby optimization and balance plan with the smallest standby scheduling cost.Finally,in order to solve the above-mentioned three-level collaborative optimization model,an improved ant colony algorithm based on information entropy and chaos search is proposed.Shenzhen International Low-Carbon Park in Shenzhen,China is selected as an example object to verify the practicability and effectiveness of the proposed model.(5)A multi-energy coordination and multi-level optimization model for Micro energy grid clusters is proposed.First,integrate a variety of energy production equipment,energy conversion equipment and energy storage equipment into the Micro energy grid,designing a multi-micro energy grid at different stages(days,day in,real-time)and multi-level bidding game framework system.Then,in order to simulate the bidding game process of multi-micro energy grid,an improved ant colony algorithm based on adaptive adjustment of pheromone volatility factor and transition probability is proposed.Finally,the Shenzhen International Low-Carbon Park in China was selected for a case study to develop the optimal operation strategy for the Micro energy grid cluster.(6)A comprehensive benefit evaluation model for the collaborative operation of the Micro energy grid group system was established.First of all,the possible operating situations in the modes of "determining heat by electricity","determining electricity by heat",and "hybrid electricity" are analyzed.Secondly,according to the multi-load characteristics of residential buildings,office buildings,shopping malls and other buildings in the Micro energy grid cluster system,an in-depth load curve and a typical daily load curve for winter and summer are constructed.Finally,the structural layout of the microgrid cluster system is analyzed,and the 3E benefit evaluation index of the microgrid cluster is designed from the perspectives of economy,energy saving and emission reduction.The comprehensive benefit advantage of the Micro energy grid cluster system is verified by example analysis...