| With the continuous improvement of the permeability of new energy in the distribution system,the traditional distribution network is facing great challenges in the aspects of renewable energy consumption,network power flow regulation and other dispatching and control.Considering the advantages of voltage source converter(Voltage Source Converter,VSC)in renewable energy grid connection and control,AC/DC hybrid active distribution network(Active Distribution Network,ADN)arises at the historic moment.By developing the positive advantages of voltage source converter(VSC)in grid connection and management,the AC/DC hybrid active distribution network(and)has entered the public’s attention,showing great value for use.Combined with the flexible control of VSC,the distributed energy(Distributed Generator,DG)connected to the system is dispatched and controlled,and the DG and AC/DC network are used as a whole for power flow regulation and voltage control.Considering the flexible power flow control and voltage support ability of flexible DC system,AC/DC hybrid distribution network will have more obvious advantages in improving voltage quality,reducing network loss and formulating flexible fault recovery strategy.As the access of distributed energy and the construction of converter stations have changed the various characteristics of the network,when the above regulation and control operation is realized through the distribution network reconfiguration strategy,and scheme will have more obvious advantages in ensuring voltage quality,reducing intermediate loss and formulating flexible fault recovery strategy.Therefore,in this research,combined with the actual demand of a large number of distributed energy to be connected to AC/DC hybrid distribution network,the relevant power source location and capacity determination and power grid reconfiguration are analyzed,and some conclusions are drawn as follows:The types of distributed power supply and the research status of flexible DC transmission system are introduced,the concept of AC/DC active distribution network is introduced,and the research status of distribution network reconfiguration strategy is summarized as a reference for this research.Summarize and further analyze the existing research,through the application of various mathematical models of distributed energy and flexible DC transmission system in traditional distribution system,in this part of the research,it focuses on the mathematical research model of related power grid system and the related power flow model based on iteration.By analyzing the influence of distributed energy on distribution network,an optimal configuration scheme of distributed power based on sensitivity and weak node analysis is proposed.Based on IEEE33-node distribution system,Based on sensitivity analysis and weak node analysis,the power division scheme is proposed,and combined with IEEE 33 bus distribution system.The reconfiguration model of AC/DC distribution network is proposed,combined with the improved ant colony algorithm,and analyzed the effect of power supply configuration on network reconfiguration.After the performance of the relevant power grid system before and after the power grid reconfiguration,as well as the corresponding voltage distribution and network loss of the AC/DC integrated distribution network under the background of related distributed energy,a comprehensive comparative study is carried out,it is proved that the network reconfiguration method plays a good role in improving the voltage support and economic operation of the distribution network.By considering the double-layer optimization strategy of distribution network reconfiguration based on DG location and capacity,the efficiency of distributed energy utilization can be maximized and the most effective control effect can be achieved by using the least amount of distributed energy access. |
