Interpolation method suitable for high-speed sampling calculation of electrical power system
A technology of power system and interpolation method, which is applied in the direction of calculation, electrical digital data processing, special data processing application, etc., can solve the problem of long calculation time, achieve the effect of convenient application and overcome hardware overhead
Inactive Publication Date: 2014-09-03
STATE GRID CORP OF CHINA +2
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Problems solved by technology
Another way is to use software to achieve phase-locking, but the digital signal processor carries most of the calculation and control work, and it cannot be used for high-speed calculations because the calculation time is too long
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[0021] The specific implementation will be introduced in detail below in combination with the flow chart.
[0022] Such as figure 1 As shown, in this embodiment, an interpolation method suitable for high-speed sampling calculation in power systems is characterized in that it includes the following steps:
[0023] (1) Set a fixed frequency range and frequency accuracy, set the sampling count as SAM_CNT; the sampling value at a fixed hardware moment is S 0 to S n , judging that the calculated interpolation data is D 0 to D n ; Make all data initial values 0; calculate the interpolation parameter table required in the program execution offline, and the software calls the offline solidified interpolation parameter table according to the online judgment result during execution;
[0024] (2) Read sampled value data S 0 to S n ;
[0025] (3) Read the current system frequency value F c , when F c =F s , go to step (6);
[0026] (4) When the current frequency of the system...
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The invention relates to an interpolation method suitable for high-speed sampling calculation of an electrical power system. In high-speed sampling calculation, a sampling frequency varies with inherent frequency of the electrical power system, thereby meeting the calculation precision requirement; and in a case that the sampling frequency of hardware is fixed, the requirement is met generally by adopting a software phase lock, but the calculation time of the software phase lock is too long, thus the software phase lock can not be widely applied. According to the interpolation method, the problem is solved by adopting manners of offline calculating a solidification table of parameters required by sampling interpolation and online judging table look-up calculation by software. By adopting the interpolation method provided by the invention, the operation load of a digital signal processor is reduced so that the digital signal processor can effectively process signals; no hardware overhead is increased, and no hardware design needs to be changed; and meanwhile, the interpolation method provided by the invention can be popularized to other electrical power systems.
Description
technical field [0001] The invention belongs to the field of electric power system automation, and relates to a sampling interpolation technology at a high-speed fixed sampling rate for electric power system electric quantity signals (voltage, current). Background technique [0002] High-speed sampling of power (voltage, current) signals in power systems is more and more widely used in capacity calculation and power quality. The sampling frequency involved in the high-speed sampling calculation needs to be changed according to the change of the natural frequency of the power system, so as to achieve the calculation accuracy that meets the requirements. At present, there are two ways to deal with this problem. One is to use the hardware phase-locked loop to perform hardware phase-locking, and dynamically change the sampling frequency according to actual needs, so as to obtain correct sampling data; but it requires specialized hardware resources, and at the same time Before p...
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IPC IPC(8): G06F19/00
Inventor 陈彬郭晓君汤奕鲁针针
Owner STATE GRID CORP OF CHINA