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Power grid synchronous acquisition method and device for real-time detection and adjustment of crystal oscillator output frequency

A technology of output frequency and synchronous acquisition, applied in the direction of measuring devices, measuring electrical variables, automatic power control, etc., can solve the problem that the error is difficult to meet the measurement requirements

Active Publication Date: 2020-10-23
国网江苏省电力有限公司淮安供电分公司 +1
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Problems solved by technology

If these parameters cannot be accurately measured, the errors generated by the algorithm will be difficult to meet the measurement requirements, so a power grid synchronous acquisition device that can detect and adjust the output frequency of the crystal oscillator in real time is needed

Method used

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  • Power grid synchronous acquisition method and device for real-time detection and adjustment of crystal oscillator output frequency
  • Power grid synchronous acquisition method and device for real-time detection and adjustment of crystal oscillator output frequency
  • Power grid synchronous acquisition method and device for real-time detection and adjustment of crystal oscillator output frequency

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Embodiment

[0036] Embodiment: at first discriminate whether GPS loses a star, the concrete method of discriminating whether GPS loses a star is: GPS has two second pulse outputs, whether the second TIMEPLUSE2 is used as the reference standard of GPS normal operation, under the situation that GPS does not lose a star , the error per second is only about 1us, if there is a star loss, the error per second will reach 55us or even greater, so connect the second TIMEPLUSE2 signal to the timer T0 of LPC1788, assuming two PPS second pulses The interval is counting 1000, that is, 1000ms. The timing counter starts counting from the first TIMEPLUSE2 and ends when the second TIMEPLUSE2 arrives. If it can count up to 1000 or within the error range of ±0.1%, it is judged that there is no loss In the case of a star, the second pulse of the PPS is used as the signal of the synchronous clock; if it exceeds the scope of the above technology, it is considered that there is a lost star, and the algorithm for...

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Abstract

The invention relates to the field of synchronous distributed test instruments, and discloses a grid synchronous acquisition method and device for detecting and adjusting a crystal oscillator output frequency, and the method comprises the following steps of step 1, adjusting the crystal oscillator output frequency in real time; step 2, calculating the sampling frequency; step 3, synchronously collecting grid data in multiple channels; and step 4, performing discrete Fourier transform for signal processing. The device corresponding to the method comprises a main control chip, an acquisition chip, a GPS module, an external crystal oscillator and a front-end drive differential amplifier, wherein the main control chip updates the crystal oscillator output frequency in real time by determiningthe jitter condition of the external crystal oscillator and the GPS, thereby making the sampling frequency and the sampling data more accurate. The grid synchronous acquisition method provided by theinvention detects and adjusts the crystal oscillator output frequency in time when the GPS jitters or the external crystal oscillator has signs of aging or the external environment influence is deviated, so that the grid synchronous data collection is more accurate.

Description

technical field [0001] The invention relates to the field of synchronous distributed testing instruments, in particular to a method for synchronizing a power grid phasor measurement terminal, and in particular to a power grid synchronous collection method for real-time detection and adjustment of the output frequency of a crystal oscillator and a collection device thereof. Background technique [0002] The smart grid is a distributed power grid that needs to solve the grid-connected power generation of various energy sources distributed in different locations. It will put forward more requirements for the safety test and control of the entire grid. The power generation-transformation-distribution stations located in different locations Synchronous monitoring and control between is one of the problems that must be solved. Remote synchronization technology used radio signals earlier. With the emergence of GPS synchronization technology, it began to use the PPS timing pulse pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R19/25G01R25/02G01R23/163G01S19/25H03L7/18H03L7/113G08C17/02G06F15/78
CPCG01R19/2509G01R23/163G01R25/02G01R31/086G01S19/256G01S19/258G06F15/781G08C17/02H03L7/113H03L7/18
Inventor 陈健赵建洋刘建戈胡恒箫周玉明沈志辉孙成富单劲松张志鹏
Owner 国网江苏省电力有限公司淮安供电分公司
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