A reactive power optimization method based on the decomposition and coordination theory for AVC in power system

In the automatic voltage control (AVC), the reactive power is expected to be balanced locally, so the power system should be layered with different voltage grades and be separated into several areas according to the distribution of the reactive power resources in each network layer. Because of this characteristic of AVC, a reactive power optimization method based on decomposition and coordination theory is presented in order to improve the astringency of algorithm, increase the calculation speed and dispose the discrete variables more effectively. The method is tested in a 500 kv network layer in this paper.