Network-aided strategy and breaker impacts on voltage instability corrective actions for power systems with DGs

This paper investigates the impacts of circuit breaker performance on voltage instability corrective actions for power systems with distributed generations (DGs) under contingencies, and proposes a new computer network-aided strategy for stability improvement. This strategy aims to save a distribution system from imminent voltage collapse due to contingencies occurring in subtransmission system, distribution system, or DG systems from renewable energy resources. The proposed strategy is based on an instability corrective action using an optimal load shedding operation and a stability enhancive action using available capacity of DGs. This paper shows the use of state-of-the-art digital signal processing technology for determination of correct stability controls, and the application of modern computer networking technology for monitoring of distribution system operating states and transmitting of data and stability control commands. This paper presents a new two-layer fault-tolerant architecture designed for network-aided voltage instability corrective actions.