Risk Assessment of Power System based on a Three Level Capability from Active Distribution Network

Abstract

The loads of traditional distribution network were usually aggregated as an equivalent rigid load in risk analysis. However, distribution network is becoming more and more active due to the flexible topology and responsive resources, such as distributed generations (DGs) and flexible loads. In this paper, a three-level risk relief strategy for power system is proposed, which includes an active reconfiguration scheme, an active islanding scheme and a demand response scheme. Case studies are carried out on a typical IEEE 30-bus system with active distribution networks to verify the effectiveness of the proposed multi-level risk relief strategy. Simulation results show that the strategy can contribute to risk relief of power system to some extent, and guarantee the reliability index of the distribution network at the same time.