Decentralized voltage optimization and coordinated method in smart distribution grid

In order to meet requirements of distributed generator (DG) integration with distribution system and real-time simulation, a novel voltage optimization algorithm which is used to solve the active power output of DG units in distributed environment is presented in this paper. Firstly, an automatic partitioning method based on hierarchical agglomerative clustering (HAC) is proposed to decompose the distribution network. Next, according to the decoupling model, the distributed sequential quadratic programming for distributed generation (DSQP-DG) algorithm is adopted to solve the optimal outputs of DG units in a parallel way through alternating of internal and external iterations. The IEEE 33-bus and PG&E 69-bus system with DG units are considered and evaluated. Compared with auxiliary problem principle (APP) algorithm, the proposed algorithm shows that the DSQP-DG algorithm has better performance in distributed parallel voltage optimization of distribution system.