Research On Active Distribution Network And Survivability Of Its Grid Structure

With the vast penetration of distributed energy and efficient energy storage devices, as well as the rapid development of new power and electronics technology, the traditional distribution network is gradually turning to the active distribution network. The implement of key technologies in active distribution network, will have an important impact on network structure. A reasonable choice of network structure is the key to the economic operation, security and reliability of power system. As the expansion of network scale, the impact scope of fault will become wider. Therefore, improving survivability of the active distribution network structure and power supply capacity on the emergency situation will become the focus of research.The survivability of the network is defined as the ability of network’s effectiveness of its services and resilience of all services when it gets attacked externally of itself wrongly functions. The survivability of the network is used as the measurement of the network structure’s safety and reliability from the network topology’s point of view by using the connectivity of the entire network. We can analyze the structure of active distribution network with the network survivability. In this way, it is good for discover the defects of the network structure and improve the security of system, will provide a theoretical basis and technical support to optimize the next step of active distribution network planning.Based on the complex network survivability analysis theory, this paper analyzes the active distribution network structure and mainly complete the following tasks:(1) By collecting a large number of information, the paper analyzes the relevant definitions and key technological on the active distribution network; based on this analyzes the impact to the distribution network structure after implementing key technology of the active distribution network.(2) Through analyzing topology characteristics of the medium voltage distribution network and describing its complexity, the paper illustrates the serviceability of complex network theory in the analysis of network topology; meanwhile introduces theory of complex network survivability.(3) Based on the medium voltage distribution network’s owner topological property, this article constructs survivability measurement system of considering the node importance and its balance, then analyzes network structure survivability after carrying out the active distribution network technical.The complex network survivability theory is introduced to analyze the structure of the active distribution grid, which riches active distribution network structure optimization planning theory, improves the network reliability from the point of the network topology, and opens up a new pathway for the active distribution network structure optimization.