A rule-based expert system for Steady State Diagnosis of Electrical Distribution Networks

Abstract

The paper describes an expert system, named DiagRED, for the Electrical Distribution Network Steady State Diagnosis. Following the introduction, the 2 nd section presents the theoretical background regarding the applying of the Model Based Diagnosis (MBD) to the power systems steady state operation. Basic concepts and the MBD models for the discussed case are given. The 3 rd section presents the fuzzy indices for steady state operation diagnosis. Within the 4 th section, the DiagRED structure and its components are presented. Database, knowledge base and user interface are described. The main functors and rules implemented in the Prolog language are given. The 5 th section is focusing on presenting the case study, represented by a real 87 buses distribution network. Finally the conclusions of the paper are presented.

Fault Section Location for Distribution Network with DG Based on Binary Hybrid Algorithm

“…is the state expectation function that also is switching function; N is the total number of switches; x k is the fault state value of feeder section k. When a fault occurs on the feeder section i, x k is 1, otherwise 0; w is the weight coefficient that is real number in the range of [0,1]. In this paper, w is 0.5; M is the total number of feeder section in distribution network.…”

“…x j,s1 、 x j,s2 are respectively the state values of feeder section that has passed from the j-th switch to the upper and lower halves power; x j (m),x j (n) are respectively the state values of feeder section in the upper and lower halves of the j-th switch; M,N are the total number of feeder sections respectively in the upper and lower halves of the j-th switch. According to the actual detection of fault current situation in the j-th switch, the state information is uploaded by FTU is: 1 (A positive fault current is detected) 1 (A negative fault current is detected) 0 (No fault current is detected) In order to verify the validity, fault-tolerance and accuracy of the proposed fault location method for distribution networks with distributed generation. The fault simulation tests were Conducted in varieties of different situations for the distribution networks.…”

“…It has brought the huge challenge to fault section location for Distribution Networks [1][2][3][4][5][6][7][8] . This paper proposes a new fault-section location method for distribution network based on binary hybrid algorithm.…”