Device for measuring and computing synchronous vector of power system based on field programmable gate array (FPGA)

Abstract

The invention discloses a device for measuring and computing a synchronous vector of a power system based on a field programmable gate array (FPGA). The device comprises a synchronous sampling module, a frequency computation module, an interpolation module and a discrete Fourier transform (DFT) computation module, which are designed on the basis of the FPGA. The device for measuring and computing the synchronous vector of the power system based on the FPGA provided by the invention has the advantages that according to the characteristic of high-speed parallel processing of parallel logic in the FPGA, the fixed-point sampling frequency of the power system is improved; and according to analog quantity frequency, synchronous sampling data of a complete cycle are taken for interpolation, corresponding DFT computation is performed, a high-accuracy synchronous vector is obtained, and high-accuracy synchronous vector data are provided for reliable and stable operation of the power system.

Description

technical field [0001] The present invention relates to power systems, in particular to a device for measuring and calculating synchronization vectors of power systems based on FPGA (Field-Programmable GateArray, or Field Programmable Gate Array), which provides higher-precision synchronization for more reliable and stable operation of power systems vector data. Background technique [0002] Generally, a mature method to realize the measurement and calculation of synchrotron vectors in power systems is to use DSP (Digital Signal Processing, that is, digital signal processing) to perform synchronous sampling of analog data, and use the synchronous sampling data to calculate based on Fourier operations. The calculation accuracy of synchro vector measurement is of great significance to the stable operation of power system, and the main factors affecting the calculation accuracy of synchro vector measurement are synchronization sampling accuracy and calculation method. Synchron...

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Problems solved by technology

Regardless of whether DSP adopts frequency adaptive sampling or fixed interval sampling, when the analog data is not power frequency, there is always the problem of frequency leakage when using DFT to calculate. Although there are various compensation algorithms for frequency leakage, the synchronization vector measurement and calculation Accuracy is always affected, and the compensation algorithm takes up a lot of DSP instruction cycles, which limits the sampling rate of analog quantities

Under the current technical conditions, in order to improve the measurement and calculation accuracy of the synchronous vector of the power system, the sampling rate of the analog quantity must be further increased. However, increasing the sampling rate reduces the DSP operation processing time, while the calculation amount increases geometrically. , so continuing to use DSP to perform higher-precision calculations for synchronous vector measurements in power systems cannot meet the requirements

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