Interpolation method suitable for high-speed sampling calculation in power system
A technology of power system and interpolation method, which is applied in calculation, electrical digital data processing, special data processing application, etc., and can solve problems such as long calculation time
Active Publication Date: 2016-09-07
STATE GRID CORP OF CHINA +2
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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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[0022] Combined with the flowchart, the specific implementation is introduced in detail.
[0023] (1) Use the interpolation method to calculate the interpolation parameter table required for program execution offline:
[0024] Taking the fixed sampling point of 24 points per cycle under the fixed power system frequency of 50 Hz as an example, the sampling frequency is 1200 Hz. The sampling period should be T s =1000000 / (50*24); the precision is 0.01Hz, and there are 1000 offline calculation forms in total. The data in each table corresponds to the current frequency difference multiple table.
[0025] Example: When the system frequency is F c =48Hz, the actual sampling period should be T c =1000000 / (48*24);
[0026] The current frequency difference ratio, that is, the cycle difference ratio is α=ΔT / T s =|T c -T s | / T s =|F c -F s | / F c =0.04;
[0027] Make an interpolation table for T 48 ={0,0.04,0.08,0.12,0.16.0.20.0.24,…..0.92}; make other tables similarly.
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The invention relates to an interpolation method suitable for high-speed sampling calculation of an electric system. In the high-speed sampling calculation, the sampling frequency changes according to changes of the frequency of the electric system, therefore, the precision requirement of the calculation is met. Under the condition that the sampling frequency of hardware is fixed, the requirement is completed universally by adopting software phase lock, however, the software phase lock calculation time is too long, and therefore the software phase lock is not widely applied. A curing form of parameters required by sampling interpolation calculated in an off-line mode and the mode that software conducts judgment and table look-up calculation online are provided, so that the problems are solved. The method relieves the running loads of a digital signal processor, so that signal processing can be efficiently carried out, hardware expenses are not required to be increased, hardware design is not required to be changed, and meanwhile the method can be universally applied to the other occasions of the electric system.
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