Researches on control strategy of distributed AVC for district grids

In view of power supply connection between the regional grids and smaller county grids, a novel distributed AVC system for district power networks is proposed in this paper. Firstly, a two-level AVC system is set up in the region and county power dispatch centers separately based on the integrated EMS both for regional wide and county wide grids. In this way, the two-level AVC system can be operated in either global or independent mode. Then the distributed AVC optimal control model is established, and the weighting factor is introduced in the objective function of the system, leading to the simplified calculation algorithm. The optimal control model would be applied to the region and county AVC system at the same time. At last, the application in Wuhu grid shows that the system optimizes reactive power flow from the perspective of the whole region and improves the voltage qualification of the regional and county grids.