引发电力系统共振机理低频振荡的汽轮机压力脉动分析

强迫型共振机理是引起电力系统低频振荡的原因之一。该文基于汽轮机压力脉动引发电力系统低频振荡的共振机理，分析汽轮机压力脉动的产生原因，介绍压力脉动类型和特征。从理论上探讨非简谐周期性扰动下的电力系统强迫振荡，并通过时域仿真分析单机无穷大系统和多机系统中汽轮机复杂压力脉动、准周期压力脉动及冲击性压力脉动对电力系统稳定性的影响。研究结果表明，汽轮机压力脉动的类型复杂，频率成分丰富，其中复杂压力脉动如果其含有与电力系统固有频率一致的脉动分量时，会引发电力系统共振机理的低频振荡，而准周期压力脉动和冲击性压力脉动由于其幅值的快速变化，并未引发共振。该研究结果对探讨电力系统低频振荡的产生原因具有一定的参考价值。

Study on Resonance Mechanism of Power System Low Frequency Oscillation Induced by Turbo-pressure Pulsation

The forced resonance mechanism is one of many reasons of power system low frequency osillation. Based on the resonance mechanism of power system low frequency oscillation introduced by turbo-pressure pulsation, the causes of pressure pulsation are analyzed and the characteristics and type of pressure pulsation are described first. The power system forced oscillation introduced by anharrnonic periodic disturbances is then discussed. The effect of complicated pressure pulsation, ballistic pressure pulsation and quasiperiodic pressure pulsation on the stability of power system based on a single machine infinite bus power system and multi-machine power system are analyzed respectively through simulation. Results indicate that power system low frequency oscillation of resonance mechanism might be caused by the complicated turbo-pressure pulsation, when the frequency of its ingredient is consistent with or close to power system natural oscillations frequency. The resonance of power system is not aroused by ballistic pressure pulsation and quasiperiodic pressure pulsation because their amplitude vary quickly. The conclusion can provide reference to research into the causes of power system low frequency oscillation.