Research on Voltage Stability of Distributed Photovoltaic Active Distribution Network with High Permeability

This paper mainly studies the influence of distributed photovoltaic system access on the voltage stability of active distribution network, and uses PSCAD to establish a simulation model of distributed photovoltaic system, and describes the control scheme of distributed photovoltaic system in detail. Subsequently, the IEEE33 node distribution network model was established, and then on the basis of the above research, the static voltage stability, permeability and short-circuit ratio indicators of the distribution network were established, and on this basis, the influence mechanism of grid-connected distributed photovoltaic on the voltage distribution of distribution network nodes and the static voltage stability index of weak nodes was obtained by using the control variable method. Finally, the voltage stability of the active distribution network is optimized by the access of the reactive power compensation device, which provides a reliable reference for the actual distribution network to connect to distributed photovoltaics.