摘要
分析了三相电压暂降特征,包括暂降幅度、相位跳变和持续时间,提出了一个有效的信号处理算法。该算法能确切地表征相电压和正序电压的暂降特征。针对电能质量监测器以及同步向量测量单元(PMU)中获得的实测数据,利用提出的方法对其进行运算,比较出设备之间暂降特征的不同,从而证明不同设备的优缺点。大量的实验结果表明,从电能质量监测器中获得的数据能描述一个完整的扰动特性,而从PMU中获得的数据,只能描述PMU频率增加时发生电压暂降的情况。
Analyzes the three-phase voltage sag characterisation, including the sag magnitude, phase-angle jumping, and duration. A signal-processing algorithm is proposed to obtain voltage sag characteristics for phase voltages and positive sequence voltage. The proposed methodology is applied to a set of actual measurements obtained from a power quality monitor and from a synchronous phasor measurement unit （PMU）. Sag characterisation from both data sources are compared, indicating advantages and drawbacks of each device. Results show that data from PQ-monitors permit a more complete disturbance characterisation, however results from data obtained by PMUs are promissory for sag characterisation when the recording frequency of the PMU is increased.
出处
《煤矿机电》
2016年第1期52-54,59,共4页
Colliery Mechanical & Electrical Technology
