Power signal synchronous sampling system and method
A technology of synchronous sampling and power signals, applied in electrical components, analog-to-digital converters, code conversion, etc., can solve the problems of low measurement accuracy, avoid leakage errors, ensure frequency synchronization, and meet the requirements of national error standards Effect
Inactive Publication Date: 2019-01-01
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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[0004] The embodiment of the present application provides a power signal synchronous sampling system and method to solve the problem of low measurement accuracy caused by the traditional power system electrical signal measurement method in the prior art
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] The core of the present invention is to provide a power signal synchronous sampling system and method, which can solve the problem of low measurement accuracy caused by traditional power system electric signal measurement methods in the prior art.
[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention will be further described in detail below in conjunction...
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The invention discloses a power signal synchronous sampling system, and the system comprises a mutual inductor, a controller, an A / D conversion chip, a phase-locked loop, and a shaping circuit. On theone hand, after a measured electric signal is converted by the mutual inductor, the shaping circuit connected with the mutual inductor can perform the correction of the converted electric signal, andthe corrected electric signal is transmitted to the phase-locked loop connected with the shaping circuit, and then a sampling signal with the same frequency is outputted, thereby guaranteeing the frequency synchronization of the measured electric signal and the sampling signal; on the other hand, the controller connected with the phase-locked loop and the A / D conversion chip can control the A / D conversion chip to convert the measured electric signal converted by the mutual converter at a signal zero crossing point into a digital signal, thereby further guaranteeing the frequency synchronization of the measured electric signal and the sampling signal. The system can avoid the leakage of an error, improves the measurement accuracy of the electric signal, and improves the metering accuracy of an electric energy metering tool. In addition, the invention also discloses an electric signal synchronous sampling method, which has the above effects.
Description
technical field [0001] The invention relates to the field of power system signal acquisition, in particular to a power signal synchronous sampling system and method. Background technique [0002] Traditional power signal measurement devices generally adopt a timing measurement method for grid voltage and current, that is, convert analog signals into digital signals according to a set sampling period, which can be accurately measured in an ideal grid. However, in the actual power grid, the power load will fluctuate from time to time, which will cause the frequency of the power grid to change. Therefore, in the actual power grid, once the grid frequency fluctuates, the timing sampling cycle will deviate from the actual cycle of the grid, and the accumulation of this periodic asynchronous error will lead to more serious leakage errors. When the grid voltage and current are measured, the error cannot meet the requirements of the national standard, and the measurement accuracy i...
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IPC IPC(8): H03M1/12
CPCH03M1/1255
Inventor 肖勇张乐平胡珊珊王吉李鹏
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD