Source And Network Coordinated Planning Of The Active Distribution Systems And The Integrated Energy Systems

With the popularization of distribution generation and demand response,promoting the matching between distribution generation,controllable load and distribution network is the guarantee for economic construction of distribution network.The existing active distribution system planning research fails to fully consider the optimizable space for all the decision-makings of users and electricity company in the planning and operation process,so it is difficult to comprehensively describe the interaction relationship between different agents.In addition,under the strategy of optimizing energy structure and improving energy efficiency,the integrated energy system has been widely promoted.There is a lack of fast and effective site optimization methods in the existing integrated energy system planning research,and the load characteristics are not considered in the process of energy supply area division.Therefore,a coordinated planning method for active distribution system and an alternating optimization method for integrated energy system are presented to solve these problems.The details of the study are as follows:(1)Aiming at the problem of active distribution network planning considering distributed generation and demand response,an active distribution system source and network coordinated planning model and method with demand response and optimized operation strategy is presented.Firstly,based on the in-depth analysis of the game relationship between the electricity company and users in the planning and operation,the source and network coordination planning model with the operation strategy is established.Secondly,a rapid link and loop network generation strategy based on the broken circle method is proposed,and an encoding/decoding scheme of particle swarm optimization is developed.Thirdly,based on the load characteristics and customers demand response willingness,a dynamic time of using price optimization method and operation strategy are proposed,and the source-network coordinated planning solution process considering the operation optimization is presented.Finally,a case study of a medium voltage distribution network is presented,and it shows that the distributed generation and demand response can reduce the construction scale of the distribution network,reduce the cost of electricity for users,and promote the localization consumption of distributed power.(2)Aiming at the problem of station and network planning for integrated energy system,an alternative optimization method considering load characteristics for energy station sitting,energy supply area division and pipe network layout is proposed.Firstly,based on the energy supply radius of energy station,the method of determining the number of new energy stations is proposed.Then based on the topological characteristics of cellular networks,the initial site determination method is presented.Secondly,considering the load characteristics,the evaluation index and division method of the integrated energy stations energy supply area division are proposed.Thirdly,Aiming at the problem of pipe network layout on the road,a pipe network optimization method based on Kruskal algorithm is proposed.Combined with the linear optimization model,the access direction of load and road pipe network are optimized.Then,the calculation method of load “equivalent energy distance” and the site optimization method based on “equivalent energy distance” are proposed.Finally,The case analysis of the single-source and multi-source integrated energy systems shows that,the site optimization method based on equivalent energy distance is beneficial to the construction of pipe network.Also,considering the complementary load characteristics can reduce the scale of equipment construction of the integrated energy system.