Transmission network including VSC-HVDC expansion planning based on genetic algorithm with shift operation

Abstract

An important purpose of building VSC-HVDC is to eliminate the overload and optimize the power flow in electric power network. From the points of the transmission network, a VSC-HVDC in electric power network influences the two end nodes' injection power of DC transmission line virtually and the injection power will further influence the distribution of branch power. The elimination of overload in electric power network that caused by VSC-HVDC has been considered when making transmission network expansion planning. A fast optimization model for power of transmission network including VSC-HVDC is built to minimize the network power loss. A new genetic operation called shift operation which will change the order of chromosome's local coding is added to the algorithm to keep the diversity of population. Garver-6 system is taken as an example to verify the correctness of the fast optimization model and prove that the genetic algorithm with shift operation can avoid local convergence more effectively. The genetic algorithm with shift operation is a beneficial attempt to improve the global convergence of genetic algorithm. The fast optimization model for power of transmission network including VSC-HVDC is proved to be practical.