Short-Term Voltage Stability Constrained Two-Stage Dynamic Optimal Reactive Power Flow

This paper proposes a two-stage dynamic optimal reactive power flow (DORPD model aiming to improve short-term voltage stability and the service life of discrete devices including on-load tap changer (OLTC) and capacitor banks. In the first stage, the set values of discrete devices are obtained through solving a mixed integer quadratic programming (MIQP) model, with the consideration of the switching operation constraints of discrete devices. In the second stage, short-term voltage stability constraints are proposed firstly; then the constraints are linearized through trajectory sensitivity solved by time domain simulation; finally, linearized constraints are incorporated into DORPF model with the set values of discrete devices gained from the first stage. The effectiveness of the proposed model and method is validated on the IEEE 39-bus system.