The decreasing spectrum leaking method for power quality monitoring systems

Power quality monitoring system adopt the series-processing method always based on sampling-analyzing-sampling, it misses a lot of information of the data-analyzing intervals between two-samplings. This paper presents a method based on period scale, process and analyze not only major parameters of state standard, but also short-time and long-time issues, so it can realize real-time monitoring and quantificational analysis. The synchronized sampling data and error item are used to express nonsynchronized sampling serial, advances a iterative formula. Nonsynchronized data is close to synchronized data by iteration. From the point of view of spectrum of period signal, the method decreases and disappears even spectrum leaking. In addition, the method decrease the amount of sampling points in one period, and sampling data of several sampling interval.