An evaluation index of voltage stability of distribution network considering DG

Aiming at the problems, of which distributed generation(DG) access has the influence on the grid voltage, a voltage stability evaluation index (F_VSI) considering DG is proposed. The theoretical deduction and analysis process is given. Taking the typical circuit of IEEE33 node as an example, the simulation experiment is carried out in different proportion of DG. Through the comparative analysis of the experimental data, the validity of the proposed F_VSI evaluation index is verified. The results show that this indicator can reflect the impact of DG access on the voltage distribution of the distribution network.