Risk Assessment for Cascading Failures of Complex Power System

Cascading failures in power system are rare processes but often bring severe consequences. Severe cascading failures may cause large scale blackouts or even system collapse. The authors present an approach to evaluate the risk of cascading failures for complex power system, which simulates the general expansion process of cascading failures and associates the occurrence probability of cascading failures with their consequences, then a quantitative risk index is proposed by which the hidden trouble of power system can be discovered and the potential safety hazard can be revealed. On this basis, the software for risk assessment of cascading failures in power system is developed according to risk theory. Taking NPCC 48-machine system for example, the simulation result shows that the proposed method is advanced and effective.