Matching loop full-digital type power quality monitoring device and method adopting three-tier architecture

Abstract

The invention provides a matching loop full-digital type power quality monitoring device and method adopting three-tier architecture. The matching loop full-digital type power quality monitoring device comprises a data processing unit, a DSP calculating unit and an FPGA front unit. The data processing unit is connected with the DSP calculating unit connected with the FPGA front unit. The device has the advantages that the three-tier architecture and reasonable task distribution based on the characteristics of platforms of all layers are adopted, the data processing ability of the full-digital type power quality monitoring device is improved, and monitoring of the power quality up to five hundred and twelve wave points of each cycle and sixteen loops to the maximum is achieved; by means of a resampling technology, the problem that system fundamental frequency can not be tracked in the sampling process of a digital mutual inductor is solved, frequency tracking of digital sampling is achieved, the problem that spectrum leakage occurs when a sampling value of an original digital mutual inductor is utilized for harmonic analysis is solved, and the problem of effective value fluctuations generated when effective value calculating is carried out is solved.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a device and method for all-digital power quality monitoring with a three-layer structure and a configurable loop. Background technique [0002] At present, digital substation has become the development trend of power system. At present, most of the domestic and foreign research focuses on the relay protection and integrated parts of digital substations. The research on power quality monitoring systems applied to digital substations is rare at home and abroad, and most power quality monitoring devices cannot be connected. The merging unit of the substation; the digital power quality online monitoring device has different access requirements from the traditional power quality device. At the hardware level, the ST multimode 100M fiber optic Ethernet interface to the digital substation process layer should be provided, and at the software level, it should be able to analyze the data f...

AI Technical Summary

Problems solved by technology

[0004] The current merging units output digital sampling signals at equal time intervals. At this time, if the grid frequency deviates (for example, to 50.1Hz), the cycle sampling time is not equal to the cycle time of the actual waveform due to the inability to track the hardware frequency. In this case, if the harmonic calculation algorithm of the conventional device is still used, serious spectrum leakage will occur. The higher the harmonic order, the greater the calculation error, and it is impossible to achieve accurate harmonic analysis.

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