Digital phase position checking device by using identical clock source for calibrating sampling time

Abstract

The invention discloses a digital phase position checking device by using an identical clock source for calibrating sampling time. The digital phase position checking device by using the identical clock source for calibrating the sampling time comprises an FPGA (field-programmable gate array) hardware unit used for front-end signal acquisition, a PowerPC microprocessor used for back-end data processing, an SDRAM (synchronous dynamic random access memory) and a FLASH, wherein the FPGA hardware unit is connected with the PowerPC microprocessor through a bus, and the SDRAM and the FLASH are connected with the bus. A synchronous pulse signal receiving interface, an A / D (analog / digital) sampling interface, two parallel FT3 data receiving interfaces and two parallel optical Ethernet data receiving interfaces are arranged at an input end of the FPGA hardware unit. The digital phase position checking device by using the identical clock source for calibrating the sampling time has the advantages of simple structure, convenience in manufacture and high practicality, phase position checking error caused by crystal oscillator error from different clock sources in the prior art can be eliminated, response consistency is guaranteed, and urgent demands of intelligent substations and digital substations on high precision of electrical quantity phase position checking can be satisfied.

Description

technical field [0001] The invention relates to a phase verification device used in an intelligent substation and a digital substation, in particular to a digital phase verification device that uses the same clock source to calibrate the sampling time, and belongs to the field of detection equipment for smart substations and digital substations in power systems. Background technique [0002] Smart substation is an indispensable part of smart grid construction. At present, the development of domestic smart substations and digital substations has entered the stage of large-scale engineering applications. With the large-scale application of electronic transformers, digital acquisition units, and merging units, the sampling signal between electrical equipment has changed from the traditional cable analog transmission method to the optical fiber digital transmission method. Correspondingly, new requirements are also put forward for the traditional substation electrical quantity ...

AI Technical Summary

Problems solved by technology

A type of hardware platform architecture based on a single embedded processor can only complete the phase verification of SMV messages in the form of Ethernet, and does not have the phase verification of FT3 and analog reference sources; a type based on FPGA and PowerPC dual processor architecture , but FPGA and PowerPC have their own clock crystal oscillator sources, the real-time difference in accuracy and response between the two will cause phase calibration errors

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