基于相位差校正法的虚拟谐波功率与电能计算  

The virtual computation for harmonic power based on phase difference correcting method

作　　者：戎君[1] 张贵新[1] 朱小梅[1] 王鹏[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《电测与仪表》2008年第11期1-5,21,共6页Electrical Measurement & Instrumentation

摘　　要：本文以实现数字化变电站中的虚拟谐波功率与电能计量为目的,考虑到目前电力系统中存在的谐波电能计量不合理问题,根据谐波频率正弦波是从基波频率正弦波锁相倍频产生这一原理,介绍了在LabVIEW中以相位差校正法为基础的,通过对基波频率进行校正后再对谐波频率进行校正的谐波计算方法。在LabVIEW中仿真了正常情况下和频率偏移情况下该方法的计算效果,对仿真结果进行了误差分析;同时,利用已有的虚拟仪器软硬件平台进行了试验测量。仿真和试验结果都验证了这种虚拟功率计算的实用性和高准确度。最后,为说明该计算方法在电能计量应用中的实时性,与电子式电能表进行了对比试验,试验结果说明其在实际的电能计量中具有良好的实时性和准确度。Aiming at the achievement of virtual power and electric energy measurement in digital substation, considering the unreasonable harmonic energy measurement problem in present power systems, according to the principle that the harmonics are produced by the phase-locking and frequency multiplication of first-harmonic, a kind of harmonic power computation based on the phase difference correcting method is introduced. The method corrects the harmonic frequency after correcting the first-harmonic frequency. The effectiveness of the method in normal and frequency deviation condition is simulated in the software LabVIEW and the results of the simulation are analyzed. Meanwhile, the method is tested in the existing virtual instrument software and hardware platforms. Both the simulation and the test results certify the real-timing and high accuracy of the virtual power measurement method. At last, in order to indicate the real-timing of the method in the practical electric energy measurement application, comparison experiments with watt-hour meter are performed. The results show the method still has good real-timing and high accuracy in the practical electric energy measurement.

关 键 词：相位差校正法 FFT 谐波功率 电能计量 虚拟仪器 

分 类 号：TM933[电气工程—电力电子与电力传动]