Ultra-high-order harmonic measuring device and measuring method

Abstract

The invention relates to an ultra-high-order harmonic measuring device and a corresponding measuring method, and belongs to the technical field of electric energy quality detection. An analog input interface of a backboard of the device is respectively connected with corresponding input ends of an FPGA (Field Programmable Gate Array) through a group of filtering conversion circuits which are connected in parallel; each filtering conversion circuit consists of a band-pass filter and a digital-to-analog converter; the digital output interface is connected with the corresponding input end of the FPGA through the backboard network interface and the network physical layer interface; the band-pass filter is composed of analog front-end circuits connected in series and first and second filter circuits connected in paralle; and the output end of the digital-to-analog converter is connected with a corresponding input port of the FPGA. The method on the basis of the device actually realizes correction of a final harmonic calculation result according to actually measured amplitude-frequency characteristics, so that the harmonic measurement precision is improved. By the adoption of the method, measured data can have repeatability and consistency, and the requirements of IEC 61000-4-30 (edition 3.0) can be practically met.

Description

technical field [0001] The invention relates to a harmonic measurement device, in particular to an ultra-high harmonic measurement device, and also relates to a corresponding measurement method, which belongs to the technical field of power quality detection. Background technique [0002] With the massive access of distributed photovoltaic power generation, micro-grid, and electric vehicle charging piles to the distribution network, and the wide application of IGBT inverters with high switching frequency, although the power quality of conventional harmonic pollution has been improved due to the increase of switching frequency, But this brings the problem of higher harmonics. [0003] There is no accurate definition of high-order harmonics. From the perspective of the evolution of relevant international standards, in the IEC 61000-4-30 (version 2.0) (or IEC 61000-4-7) (version 08) standard, the high-order harmonics The definition of is the component of the harmonic frequency...

AI Technical Summary

Problems solved by technology

Although the technical solution of this patent refers to the processing method and calculation method of 2KHz~9KHz in part of IEC 61000-4-30 (version 2.0) for the measurement range and calculation method of high-order harmonics, it does not meet the requirements of IEC 61000-4- 30 (version 3.0), because IEC 61000-4-30 (version 3.0) defines standardized measurement and data processing specifications, only under this premise can the measurement results of different devices for the same measurement point have consistency, thereby laying the foundation for regional statistics

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