1.State Grid Henan Electric Power Company Economic and Technical Research Institute;2.School of Electrical Information Engineering,Changsha University of Science and Technology
By means of reactive power compensation, the voltage distribution in AC-DC hybrid distribution network can be op-timized, the network loss can be reduced, the safety margin of the network can be increased, and the power supply reliability can be improved. In order to realize the directional compensation of the reactive power in AC-DC hybrid distribution network and describe the weak point of the voltage in the system directly, a reactive power compensation method based on sensitivity analysis is proposed. Based on alternating iteration method, the power flow of AC-DC hybrid distribution network is calculated to obtain the Jacobian matrix in which the power flow has converged, there-by calculating the sensitivity of node voltage change on reactive power injection, and selecting the point with the maximum sensitivity as the reactive power compensation access point. In addition, to meet the requirement of system power factor, the reactive power compensation capacity of access point is determined. An example analysis conducted on 11-node system shows that this method takes less time to calculate and has better compensation effect compared with the harmony algorithm. The results show that the proposed method can raise the system voltage level with the minimum compensation capacity at the greatest extent and effectively reduce the system network loss.