Sampling interval compensation method and system for restraining spectrum leakage

Abstract

The invention provides a sampling interval compensation method and a sampling interval compensation system for restraining spectrum leakage. The sampling interval compensation method comprises the following steps: A, calculating an ideal sampling clock number; B, compensating the ideal sampling block number to obtain a compensated sampling interval according to accumulated truncation errors; C, rounding off the compensated sampling interval to obtain a practical sampling interval; and D, updating accumulated truncation errors according to the practical sampling interval and the compensated sampling interval. The sampling interval compensation method and the sampling interval compensation system provided by the invention have the beneficial effects of improving the stability of the measured data, improving the precision of the measuring data and restraining the spectrum leakage of harmonic analysis.

Description

technical field [0001] The invention relates to the field of digital electric meters, in particular to a sampling interval compensation method and system for suppressing spectrum leakage. Background technique [0002] In modern digital electric meters, sampling is controlled by the sampling clock inside the system, and the sampling control clock frequency of various chips ranges from several megabytes to hundreds of megabytes. When using the sampling control clock for sampling control, since the sampling interval can only be an integer multiple of the sampling control clock interval, if figure 1 There will be a truncation error between the theoretical sampling interval and the actual sampling interval as shown, resulting in the situation that the time interval of the sampling point of a cycle is not equal to the cycle length of the sampling signal. Since the time interval of the sampling point of a cycle is not equal to the cycle length of the sampled signal, it will cause ...

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Problems solved by technology

When using the sampling control clock for sampling control, since the sampling interval can only be an integer multiple of the sampling control clock interval, if figure 1 There will be a truncation error between the theoretical sampling interval and the actual sampling interval shown, which will cause the situation that the time interval of the sampling point of a cycle is not equal to the cycle length of the sampling signal

Since the time interval of the sampling point of a cycle is not equal to the cycle length of the sampling signal, it will cause fluctuations in the effective value of the measurement signal and a decrease in accuracy, and will cause spectrum leakage during harmonic analysis

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