无功功率计量中移相法的FPGA实现

FPGA realization of phase-shift method in reactive power measurement

无功功率计量方法中的移相法有两种实现方法,一种是基于采样点平移,另一种是利用希尔伯特滤波器。在Matlab上对这两种方法进行了设计、仿真,并采用EP2C50型号的FPGA实现了希尔伯特滤波器。数据表明基于采样点平移的方法有局限性,而希尔伯特移相无功算法具有移相准确的特点,保证了无功功率的精确计量。

There are two ways to carry out phase-shift which is one way of reactive power measurement,the one is the way which is based on the sampling points,the other one is to use Hilbert filter.In this paper,the two ways are designed and simulated on Matlab,and the Hilbert filter method is verified on a FPGA chip of EP2C50.The results show that the method based on sampling points is limited in practical application,but the Hilbert filter method has the advantages of Phase-shift accuracy,to ensure the accuracy of reactive power measurement.