基于广域测量信息的失步中心快速定位方法

研究了能够减小系统频率偏移影响的相量算法,提出了一种基于母线电压的失步振荡识别方法和一种失步中心快速定位的新方法。所提定位方法依靠广域测量系统上传的3组电压、电流数据,在系统两侧电势幅值不等和全系统阻抗角不同同时存在的场景下,通过求解测量阻抗轨迹方程与全系统阻抗折线方程的交点,能够在失步振荡发生后而两侧电势相角差未达到180°时定位失步中心所在元件,并利用实时测量数据与理论计算值存在的关系确定失步中心出现的时刻,从而为复杂电力系统失步解列断面的确定和解列时刻的选择提供依据。仿真结果验证了所提方法的有效性。

Fast locating method of out-of-step center based on wide area measurement information

A phasor algorithm which can reduce the effect of system frequency deviation is studied. An out-of-step oscillation identification method based on bus voltage and a new fast out-of-step center locating method are proposed. In the scene that both the voltage amplitude of the two sides of the system is different and the whole system impedance angle is different, the proposed methods can locate the component where the out-of-step center belongs to when the out-of-step oscillation occurs and the phase difference of the two sides of the system is not up to 180°,by solving the intersection of measured impedance trajectory equation and the whole system impedance poly line equation, according to three groups of voltage and current data uploaded by wide area measurement system. The appearing time of out-of-step center is determined by the relationship between real-time measured data and the theoretical calculative value, so as to provide the basis for the determination of the out-of-step separation section and the selection of separation time for complex power system. Simulative results verify the effectiveness of the proposed methods.