A Sequence Component Based Continuation Power Flow Model for Electric Power Grid Considering Transmission and Distribution System

Integration of Inverter Based Resources (IBRs) in the distribution grid and bulk grid has posed new challenges to the long-term voltage stability of the integrated electric Transmission and Distribution (T&D) system. The main challenges include, but are not limited to, IBR variability and intermittence, the effect of a large number of DERs, distribution grid unbalances, the effect of load types, and the interaction of controllable devices such as voltage regulators. This paper proposes a new three-sequence integrated T&D continuation power flow (SI-CPF) model for analyzing the voltage stability of the power grid considering, grid and load unbalance, various load types, and renewable energy variations, in a combined T&D simulation that consider all the phases of transmission and distribution network. Results show that SI-CPF can provide the weak phase voltage stability margin of the power grid more efficiently and accurately considering a three-phase integrated T&D network.