1P.G scholar, Department of EEE, J.J college of Engineering and Technology, Trichy, India
2Professor, Department of EEE, J.J college of Engineering and Technology, Trichy, India
Online published on 8 November, 2017.
Stability is an important constraint in power system operation and the transient stability constrained optimal power flow (OPF) has always received considerable attention in recent years. In this paper, the defects of the existing models and algorithms around this topic are firstly analyzed, on the basis of which, a multi-objective optimization method is proposed. This paper proposes an improved steady state equivalent circuit method to determine transient stability of a distribution system or a micro-grid with multiple IGs. Interaction between IGs and distribution network during a fault is investigated. The relationship between network parameters and speeds of IGs is derived using the steady-state equivalent circuits of IGs. The critical speed and critical fault clearing time (CCT) for maintaining system stability are determined using the proposed technique. Case study results demonstrate the proposed multi-IG distribution system has many advantages, compared with traditional using dynamic simulation.
Critical clearing time, critical speed, distribution network, induction
