基于2阶Hann自卷积窗的谐波电能高精度量测方法研究与实现

李冬; 艾黄泽; 尹领; 曾非同; 周峰

李冬,艾黄泽,尹领,曾非同,周峰.基于2阶Hann自卷积窗的谐波电能高精度量测方法研究与实现[J].电测与仪表,2024,61(3):167-176.
LI Dong,AIHuangze,Yin Ling,ZENG Feitong,ZHOU Feng.Research and implementation of high-precision measurement method of harmonic electric energy based on 2-order Hann self-convolution window[J].Electrical Measurement & Instrumentation,2024,61(3):167-176.

基于2阶Hann自卷积窗的谐波电能高精度量测方法研究与实现

Research and implementation of high-precision measurement method of harmonic electric energy based on 2-order Hann self-convolution window

DOI：10.19753/j.issn1001-1390.2024.03.023

中文关键词: 谐波电能计量 2阶Hann自卷积窗双谱线插值 ZYNQ

英文关键词:harmonic energy metering, second-order Hann self-convolution window, bispectral interpolation, ZYNQ

基金项目:国家重点研发计划资助项目（2022YFB2403800）

作者中文名	作者英文名	单位
李冬	LI Dong	华中科技大学电气与电子工程学院
艾黄泽	AIHuangze	华中科技大学电气与电子工程学院
尹领	Yin Ling	华中科技大学电气与电子工程学院
曾非同	ZENG Feitong	中国电力科学研究院有限公司
周峰	ZHOU Feng	中国电力科学研究院有限公司

摘要点击次数: 642

中文摘要:

分布式光伏发电根据全发电量进行补贴，无法约束其并网对配电网造成的高频次谐波污染和电压波动等电能质量问题。电能谐波含量是体现分布式光伏电能质量的因素之一，可作为并网电能定价的参考依据。为了对分布式光伏谐波电能进行准确计量和快速计算，基于ZYNQ实现了2阶Hann自卷积窗及其双谱线插值校正算法，设计了一种最低运算资源的顺序型谐波计算结构，在其基础上优化设计了一种多级流水线型的谐波计算结构，大幅提升了加窗插值FFT的实时计算效率；在模拟ADC量化的条件下，对2阶Hann自卷积窗及其双谱线插值校正算法的谐波分析效果进行仿真，提供了ADC位数、采样点数N与算法选择的思路，在此基础上设计了基于ZYNQ与LTC2358的谐波量测装置硬件架构。实验与测试结果表明，该分布式光伏谐波电能表的基本误差、频率偏移误差测试满足C级静止式有功电能表标准与0.5S级无功测量仪表检定标准。此外，3~21次谐波测量误差结果显示该装置的准确度满足A级谐波测量仪表检定标准。

英文摘要:

Distributed photovoltaic power generation is subsidized according to the total power generation, which cannot con-straint the power quality problems such as high-frequency harmonic pollution and voltage fluctuation caused by its grid connection to the distribution network. Harmonic content of electric energy is one of the factors reflecting the quality of distributed photovoltaic power, which can be used as a reference for grid-connected electric energy pricing. In order to accurately measure and quickly calculate distributed photovoltaic harmonic power, based on ZYNQ, the second-order Hann self-convolution window and its bispectral interpolation correction algorithm are implemented, and a sequential harmonic calculation structure with the lowest computing resources is designed. On the basis of it, a multi-stage pipeline harmonic calculation structure is optimized and designed, which greatly improves the real-time calculation efficiency of windowed interpolation FFT; under the condition of analog ADC quantization, the sec-ond-order Hann self-convolution window and its double The harmonic analysis effect of the spectral line interpolation correction algorithm is simulated, and the idea of ADC bit number, sampling point N and algorithm selection is provided. On this basis, the hardware architecture of the harmonic measurement device based on ZYNQ and LTC2358 is designed. Experimental and test results show that the basic error and frequency offset error test of the distributed photovoltaic harmonic energy meter meet the C-level static active energy meter standard and the 0.5S-level reactive power measuring instrument verification standard. In addition, the 3~21 harmonic measurement error results show that the accuracy of the device meets the verification standard for A-level harmonic measuring instruments.

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