An integrated power restoration method based on improved genetic algorithm for active distribution network

摘要

With the increasing the permeability of distributed power supply in distribution network, the system reliability can be effectively improved by taking advantage of islanding operation capacity of DGs to restore non-fault area power supply when power failure occurs. This paper has made in-depth research on power restoration for active distribution network by taking distribution network power balance, the number of DG islands and communication switch influencing factors into consideration. By setting backup communication line equivalent to DG and referring it during decision-making process, the overall scheme superiority improves. The type and control characteristics of DGs are fully investigated in the process of using DG to restore load power. This paper also researched the recovery scheme of island power supply in master-slave control mode by separating DGs into master-slave power source. The concept of two chromosome coding constraints and genome / gene sub block are proposed by adopting improved genetic algorithm to get solution and combining active distribution network structure and master-slave control mode when separating islands. It helps to realize avoiding invalid solutions as the cross and mutation operations between chromosomes are completely based on genome. Finally, simulation has been made to verify the validity of the method proposed with 3 feeder lines and 7 DGs.