Distributed reactive power optimization and programming for area power system

A distributed reactive power optimization method for area power system is presented in this paper. Considering the difference of network structure and the characteristics for reactive power optimization, area power system is divided into a subtransmission sub-system and distribution sub-systems according to layers and regions. So the optimization problem of large-scale area power system is decomposed into several optimization sub-problems of small-scale systems, which can reduce the difficulty of reactive power optimization problem significantly. The subtransmission sub-system and distribution sub-systems are independent relatively in power flow algorithms, objective functions and optimization algorithms. The optimization of the whole area power system is solved synthetically in the distributed computing way. Based on the proposed approach, a Client/Server software package is also introduced. The simulation results, greatly improved voltage profiles and reduced power losses, show that this method is feasible and effective.