CAJ | 학술논문

强迫功率振荡源的在线定位对电网安全稳定运行具有至关重要的作用。基于相量测量装置(phasor measurement unit，PMU)的实测数据和同步发电机转子运动方程，给出振荡过程中发电机机械输入功率波动的计算方法。通过对振荡过程中发电机机械输入功率波动、电气输出功率波动、转速(频率)波动的相位关系的理论分析，给出强迫功率振荡的在线监测分析方法。如果原动机不是强迫扰动源，发电机组因响应外界扰动而处于振荡过程中时，机械功率的波动相位滞后于电气功率的波动相位。由于引进PMU实测数据，所提方法可实现各个发电机组独立分析、相互解耦，避免了引入全网模型带来的分析误差和可靠性降低，减少了在线监测分析的复杂程度。实际算例表明，所提方法能有效判断同步发电机是否为强迫功率振荡源，为低频振荡的分析、控制提供可靠参考。
강박공솔진탕원적재선정위대전망안전은정운행구유지관중요적작용。기우상량측량장치(phasor measurement unit，PMU)적실측수거화동보발전궤전자운동방정，급출진탕과정중발전궤궤계수입공솔파동적계산방법。통과대진탕과정중발전궤궤계수입공솔파동、전기수출공솔파동、전속(빈솔)파동적상위관계적이론분석，급출강박공솔진탕적재선감측분석방법。여과원동궤불시강박우동원，발전궤조인향응외계우동이처우진탕과정중시，궤계공솔적파동상위체후우전기공솔적파동상위。유우인진PMU실측수거，소제방법가실현각개발전궤조독립분석、상호해우，피면료인입전망모형대래적분석오차화가고성강저，감소료재선감측분석적복잡정도。실제산례표명，소제방법능유효판단동보발전궤시부위강박공솔진탕원，위저빈진탕적분석、공제제공가고삼고。
Online detection of forced power oscillation source plays a crucial role in safe operation of power systems. Based on phasor measurement unit (PMU) measurements and swing equations of synchronous generator, this paper proposed a method to calculate the fluctuation component of generator unit’s mechanical power in the process of low frequency oscillation. By analysing the phasor relationship among mechanical input, electric output, and rotor speed (frequency), this paper proposed an online method for forced power oscillation detection. If a generation unit is not a forced oscillation source, and it is oscillating simply responding to external disturbance, then the phase angle of mechanical power fluctuation lags electrical power fluctuation. The proposed method is independent of power system model. Interactions among different generation units are decoupled by the adoption of PMU measurements, thus, errors introduced by power system model can be avoided, and moreover, the complexity of analysis algorithm is greatly reduced. Actual examples recorded by wide-area measurement system (WAMS) show that, the method is effective to determine whether the monitored generator is a source of forced oscillation or not.