Risk Analysis of Cascading Outage of Large-Scale Wind Power AC/DC Hybrid System Based on Probabilistic Load Flow and Short Circuit Ratio

With the continuous increase of wind power grid-connected scale, in order to sense the operational risk of largescale wind power and grid-connected AC/DC hybrid system online, this paper proposes a method based on probabilistic power flow to calculate the cascading failure risk analysis method. Firstly, based on the sequential operation theory, the power system probabilistic load flow calculation model of large-scale wind power grid-connected is constructed, and then the accident chain probability risk index is constructed by combining the short-circuit ratio calculation and fault search selection of AC/DC hybrid system. Finally, the accident chain search process combining probability flow and short circuit ratio is constructed, and the actual calculation is carried out on the IEEE 39-node grid model and the actual operating conditions are simulated. The operational risk of the actual AC/DC hybrid system can be obtained, which is verified by the paper. effective methods of analysis and rationality of cascading failure risk, conclusions can contain large AC and DC-scale wind power hybrid system operation arrangements to provide guidance.