RESEARCH ON SECURITY INDICES OF DISTRIBUTION NETWORKS

Abstract

This paper is based on the security rules of K(N-1+1) and started with power supplying security of distribution network, by comparing distribution network with transmission network, it indicates that static security analysis of distribution network needs security indices and analysis method which are different from transmission network. Under this precondition, the index of severity of fault is proposed firstly, and based on it, the strength index of the network structure and the holistic security index of the system are proposed then. They can be the foundation of static security analysis of distribution network. The applications of the indices proposed are also discussed. In the sample, the security indices of two systems with different security are calculated, analyzed and compared. The samples prove the security indices of distribution network proposed in this article are feasible, they can depict the severity of fault quantitatively, reflect the security of system correctly, and thay can be the basic of static security analysis of distribution network.