说明：  This program is to reconfigure distribution network by Binary Particle Swarm Optimization (BPSO) method for 33-bus distribution network. The object function is to minimize power loss. It runs in matpower 4.1 version. How to run it: 1. Download matpower version 4.1 for free at below link: http://www.pserc.cornell.edu//matpower/ 2. Extract matpower4.1 into folder. 3. Copy 3 files main.m case33.m and swarm33.m into folder matpower. 4. Run file main.m For 33 bus distribution network data, refer to the pdf file 33bus.