Total Supply Capability And Distribution System Security Region Considering Customer Classification And Interaction

In recent years,smart grid has attracted more and more eyes from researchers.Smart grid research and construction were being built all over the world.And distribution network is one of the important steps for providing electricity for customers.The intelligent of distribution network has become the new tendency of future electricity network,and plays a pivotal role in achieving safe and reliable power supply.The different requirements of customers and the interaction of customers are the important factors that must be considered in the future intelligent distribution network.In the new environment,when the main transformer or line comes to N-1,different class and types of customers will adjust the workload according to the actual situation of the power grid,which could change the value of original Total Supply Capability(TSC)and Distribution System Security Region(DSSR).This paper studies the impact of customer rating and interaction on distribution network TSC and DSSR,and proposes a TSC model and a DSSR model which takes customer rating and interaction into account.Firstly,the TSC and DSSR theories which do not consider the customer response are introduced.Based on the concept and application scenario of the existing customer classification and customer interaction,this paper analyzed the relationship between TSC and DSSR respectively at different customer class and different customer interaction modes.The other load may be related to the demand response protocol,in the system N-1 change its security constraints,thus affecting the size of TSC and DSSR.Secondly,TSC model based on existing feeder interconnections is developed,which takes account of customer classification and interaction.And based on DSSR model of existing feeder interconnect,DSSR model with customer rating and interaction is developed.With the new model,we can get the actual TSC size,DSSR security boundary and volume size of the intelligent distribution network with the customer response,and get the influence of the customer response to the distribution network.Finally,using the extended IEEE RBTS-bus4 instance,two different customer scenarios are set up for calculation and analysis.The results show that the third-class customers who signed the contract of direct load control,interruptible load,or emergency demand response can reduce TSC and DSSR,and TSC and DSSR will increase with increment of customer reducing the workload,until reaching the limit of total capacity of the grid.This method can realize the calculation of TSC and DSSR under the condition of customer rating and interaction,which can lay a foundation for guiding the distribution network with more accurate DSSR and TSC methods under customer interaction environment calculating maximum power supply.