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There are stability risks after PV plants drop into island operation, especially in case of unintentional islanding caused by grid faults and the islanding-state detection device fails to operate in time. In order to estimate those risks, firstly, the mechanism of three factors (power difference, PV permeability and motor inertia) influencing the stability characteristics of the island system in a short time after PV unintentionally dropped into island operation is analysed theoretically. Then the electromagnetic transient model of the PV station is established. According to above, the modified Dali Grid integrated with a PV station is modelled in PSCAD/EMTDC, verifying the theoretical analysis conclusions by simulation. Finally, quantitative risk index and assessment method about PV station dropping into islanding are proposed according to the simulation results, which provide the theoretical basis for the stability risk estimation.

System Stability Risk Quantitative Assessment for Island Operation with PV Plants