Soft core based merging unit of photoelectric current transformers

Abstract

The invention discloses a soft core based merging unit of photoelectric current transformers, which consists of an FPGA (Field Programmable Gate Array) chip of a main processor and a peripheral circuit. The peripheral circuit consists of a power supply module, an ARM chip, an LCD display screen, a PS2 keyboard, an EPCS16 chip, a JTAG downloading interface, a JTAG debugging interface, an FLASH chip, an SDRAM (Synchronous Dynamic Random Access Memory) chip, an Ethernet controller, an Ethernet driver, a crystal oscillator and an optical fiber interface. The FPGA chip of the main processor is used for receiving current and voltage signals transmitted through the optical fiber interface and sending the current and voltage signals with an FT3 frame format specified in the IEC 60044-8 through the optical fiber interface and with an IEC 61850-9-2 format through the optical fiber interface after interpolation calculation, digital filtering, digital integral and digital calibration operation.

Description

technical field [0001] The invention belongs to the technical field of power system measurement, and relates to a photoelectric current transformer used in a power system, in particular to a novel method for realizing a combination unit of a photoelectric current transformer, that is, a method based on a soft core. Background technique [0002] In recent years, research on electronic transformers has achieved certain results. Technologically developed countries such as the United States, France, and Japan have successively announced various optical power transformers developed by them and advertised their products. Some domestic companies have also developed The photoelectric current transformer has been put into the grid for trial operation, but the conditions for large-scale application in digital substations are not yet mature. Both IEC 60044-8 and IEC61850-9-2 have given the definition of the merging unit, and the difference between the two is that the output part is sli...

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Problems solved by technology

[0002] In recent years, research on electronic transformers has achieved certain results. Technologically developed countries such as the United States, France, and Japan have successively announced various optical power transformers developed by them and advertised their products. Some domestic companies have also developed The photoelectric current transformers have been connected to the grid for trial operation, but the conditions for large-scale application in digital substations are not yet mature

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