Abstract
Auto-parametric resonance (internal resonance) is regarded as a kind of nonlinear oscillation stemming from to the nonlinearity of synchronizing power of generators. The resonance is closely related to power system stability, especially to unstable oscillation phenomena such as "negative damping" and "sustained oscillation". The authors have already developed a quantitative analysis method and proposed stability indices to estimate power system's viability under resonance condition.This paper proposes an effective countermeasure to prevent auto-parametric resonance based on a stability index. To be specific, the sensitivity vector of the index corresponding to generator output is used to obtain an effective measure for load dispatching. The proposed control methodology can be incorporated into other control schemes such as ELD. Numerical simulations on a longitudinal 4-machine system have confirmed the effectiveness of the proposed scheme.
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