Research On The Minimum Break Point Set Of Complex Multiloop Network Adapted To The Variation Of Network Configuration

With the rapid growth of power demand and the implementation of smart power grid, the loop network is becoming more and more complicated and configuration of topology changes frequently. Opportunities and Challenges initiated by the mentioned above to directional protection setting calculation of multiloop network were unprecedent. The minimum break point set (MBPS) is the presupposition to the directional protection setting calculation of multiloop network. It is, therefore, imperative to do the research on MBPS adapted to vrariable structure.This paper proposed a caculated algorithm of MBPS based on dynamic matrix on the conditions of single-area network. With the aviability of relay-incidence matrix (RIM) and node-relay matrix(NRM), the optimum configuration of network, the selection of sepcial protection, and the minimum break point can be implemented by this algorithm. This algorithm has the advantages of smaller searching range, ignoration of circuit information, and unitified treatement of T-type lines and teminal lines. This paper also presents an updating algorithm of MBPS based on phantom break point set to adapte to vrariable structure with full utility of original MBPS. Typical systems of 5-bus,8-bus, and 14-bus are used as test examples to verify the effectiveness of the single-area schemes.Complex multiloop network is often divided into sereval areas, therefore, a calculation method based on multi-area MBPS is presented in this paper. Parallel computing carried on MBPS of each area and optimum calculation on MBPS of each main area can reduce the computing load of complicated loop on the condition that the number of break pionts is reasonable. An independent updating method of multi-area MBPS using MBPS of singal-area can reduce the complicaty of updating each large scale loop, and can parallel compute update break pionts of kinds of subareas to increase the speed of updating. The typical test system with 5-area, 68-bus has been tested to verify the effectivness of the multi-area schemes.