A Novel Analysis Scheme for Static Voltage Stability of Distribution Network with DFIG and SVC

In order to study the static voltage stability(SVS) of distribution network with DFIG and SVC, the static model of DFIG and SVC is analyzed. The voltage stability index(VSI) which can reflect the degree of voltage stability of all load buses is derived in this paper, and DFIG is connected according to the best wind resources. A voltage stability analysis scheme is presented to rapidly rank the voltage stability margin of load buses, and the vulnerable bus is determined as the best locations to install SVCs. The detail of voltage collapse is studied based on the improved continuous power flow(CPFLOW) method. Simulation results show that the strategy releases the reasonable location of SVC, which can optimize the power flow distribution. Moreover, it can further improve the power supporting ability and SVS of distribution network with DFIG, which enables the system to bear severer load increasing.