| Under the background of increasing number of residential PV units grid-connected and consumption,if the traditional operation control mode is used in the low-voltage distribution networks,it will cause a huge amount of investment in grid-connected equipment and a lot of waste of user-side resources.At present,there is currently a lack of a coordinated interaction strategy between the distribution energy management system(DEMS)and the house energy management system(HEMS).Developing effective and reasonable coordination and interaction strategies,fully exploring the potential of user demand side response resource regulation,and ensuring the safe,economic,and efficient operation of the power grid have become the key issue and research focus.Therefore,a two-stage energy management strategy for coordinated interaction between DEMS and HEMS is proposed.In the first stage,an active and reactive power regulation amount setting method based on steady-state security region and opportunity-constrained planning is proposed,which ensures the clear regulation responsibilities of low-voltage distribution system operators(DSO)and customers while ensuring network security;In the second stage,considering the maximization of the interests of the DSO and customers,a mutually independent and privacy-preserving energy management system and a interaction strategy to coordinate DEMS and HEMS are proposed.DSO takes the optimal operating economy of the system as the objective function,and returns the incremental part of operating income to users as additional rewards,which will save the investment of DSO and further improve the benefits of customers.The main work of this thesis is described below:Firstly,the overall structure of the research is established with the distribution energy management system and the user energy management system as the main objects.Based on the functional description of each role,clear regulatory rights and responsibilities for each subject object are defined.Finally,a coordinated and interactive two-stage energy control architecture was proposed.Secondly,the working principles and characteristics of three-phase four-wire lines,distributed photovoltaic,energy storage batteries,and static var generators are analyzed,and corresponding mathematical models are established.At the same time,the demand side response mechanism and potential are analyzed,and a demand response potential evaluation index system is established.Thirdly,a two-stage regulation model for coordinated interaction between lowvoltage distribution networks and users is established.In the first stage,a security domain adjustment model based on steady-state security domains and chance constrained programming is established;In the second stage,the optimization models of the energy management system on the power grid side and the user side are established respectively.The coordination and interaction strategy between the power grid and users and the stable two-stage energy regulation process are determined.Fourthly,a numerical simulation is conducted using the actual operation data of a low-voltage distribution network containing a large number of distributed photovoltaic systems in Guizhou Province,China.The results show that the proposed strategy can effectively ensure the security of the network and improve the economy of grid operation and user power consumption. |
