多机系统强迫功率振荡响应及类型判别

he mathematical expression of forced power oscillation response for the multi-machine power system after enforcing periodical mechanical power disturbances is deduced and its compositions, characteristics and influencing factors are intensively analyzed. Based on the preconditions for resonance and beat freqency oscillation, simplified expressions are obtained and the relationships for amplitude, frequency, and phase between response compositions are analyzed. After the oscillation characteristics for each composition are abstracted by identification, a method for discrimination of negative damping oscillation and forced power oscillation is proposed. The analysis results for oscillations from simulation system demonstate the charactersitics of the forced power oscillation and the validity of the oscillation type discrimation.