A power harmonic analyzer based on fpga

Abstract

The invention relates to an FPGA (field programmable gate array)-based power harmonic analyzer, belonging to the technical field of power electronics. The power harmonic analyzer comprises a sensor circuit and an AD sampling circuit as well as a data acquisition module, a data caching module, a data type conversion module, a windowing module, an FFT (fast Fourier transformation) computation module, an operational result storing and interruption generating module, a Nios II soft core processor module and an LTM (long-term memory) display module which are arranged in an FPGA. In the invention, harmonic acquisition and processing at the front end are realized by adopting hardware, thus the acceleration advantage of hardware is fully played; and the processed data is further calculated and controlled by utilizing the Nios II soft core processor in the FPGA, the process is completed on an on chip bus of the FPGA, data transmission is realized, and speediness of hardware design and control flexibility of the Nios II soft core processor are given full play.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to an FPGA-based power harmonic analyzer. Background technique [0002] Harmonic analysis of power system is of great significance in power quality analysis and power system control. Fast and accurate detection of harmonics is the basis of harmonic suppression and reactive power compensation. [0003] At present, there are many methods for harmonic detection of power systems at home and abroad. The methods for harmonic detection and harmonic analysis of power systems at home and abroad mainly include the following: [0004] (1) Analog filter method [0005] The early harmonic detection methods were all based on the frequency domain theory, that is, the analog filtering principle was used. There are two types of analog filters, one is to filter out the fundamental current component through the filter to obtain the harmonic current component; the other is to obtain the fun...

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Problems solved by technology

But this detection method has its own shortcomings: large error, poor real-time performance, especially when the grid frequency changes, it is very sensitive to the parameters of circuit components, the detection effect is obviously worse when the parameters change, and it is difficult to obtain ideal amplitude-frequency and phase-frequency characteristics

However, the device has no specific system implementation, only a functional simulation, and the FFT processing accuracy of the device is 128 bits. Due to the use of synchronous sampling, in the actual system design and implementation, it is easy to cause inaccurate sampling

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