复杂电网环境下的闪变包络提取与参数在线检测方法研究

Rapid and accurate detection of voltage flicker parameters in the complicated network parameters is a current difficult problem in the field of power quality analysis. The methods of online detection of voltage flicker parameters in the complex power grid environment are studied in this project. The specific details are as follows, ①The extraction error model and the correction factor of flicker envelope signal based on improved energy operator is established, and the calculations of improved energy operator are optimized, which can achieve the rapid and accurate extraction of the complex voltage flicker envelope signal;②The optimization window of Kaiser and Rife-Vincent mutual convolution with superior performance is constructed. An adaptive adjustment method of window coefficients which meets the requirements of the analysis of complex flicker envelope signal is established. The decision mechanism of main lobe of spectrum interference and spectrum correction methods is studied, which can achieve the rapid and accurate spectrum estimation of complex flicker envelope parameters; ③The quantitative relationship between inter-harmonics and RMS fluctuations, and the relationship between inter-harmonics and peak value fluctuations are studied. The extraction of inter-harmonics flicker fluctuation and the error correction are derived. The on-line detection method of inter-harmonics flicker parameters is established which is based on improved energy operator and the spectrum correction method of K-RV mutual convolution optimization window;④Each filtering process recommended by IEC flicker measurement is reasonable simplified, and the new simplified calculation method of flicker value is established. The project aims to provide new idea about the rapid detection of flicker, the prediction of flicker parameters and flicker elimination in the complex power grid environment.

如何在复杂网络参数下实现电压闪变参数的快速、准确检测是当前电能质量分析的难题。本项目拟研究复杂电网环境下的电压闪变参数在线检测方法，具体包括：①建立改进能量算子闪变包络提取误差模型及校正因子，优化改进能量算子计算过程，实现复杂闪变包络信号的快速、准确提取；②构建性能优越的Kaiser与Rife-Vincent互卷积优化窗，建立符合复杂闪变包络分析需要的窗系数自适应调节方法，研究主瓣频谱干扰判定机制及频谱校正方法，实现复杂闪变包络参数快速、准确谱估计；③研究间谐波与有效值波动及峰值波动的量化关系，推导间谐波闪变波动信号提取及误差校正方法，建立基于改进能量算子K-RV互卷积优化窗频谱校正的间谐波闪变参数在线检测方法；④合理简化IEC推荐的闪变测量各滤波处理流程，建立适用任意电压波动的闪变值简化计算新方法。项目研究为复杂电网环境下的闪变危害快速检测、闪变参数预估、闪变治理等提供新的研究思路。

随着新能源、电力电子设备的发展，各种非线性、冲击性负荷的不断增加，电网电压波动与闪变日趋严重，成因、波形变化也更加复杂。.本项目以复杂电网环境下电压闪变信号为研究对象，结合不同调制波形的电压闪变信号特点，构建了正弦波和矩形波调制下的电压闪变数学模型，优化能量算子性能，提出了基于数学形态学和改进能量算子的闪变包络信号提取方法以及基于解析模式分解的改进平方检波的非稳态闪变包络信号提取方法；.通过构建具有较窄主瓣且快速旁瓣衰减的K-RV互卷积自适应优化窗系数调节模型，建立了新型K-RV互卷积窗的三谱线改进FFT的调幅波闪变参数检测方法；.基于损失系数和能量差作为判断标准构建自适应确定变分模态分解方法，提出了一种基于改进平方检测和自适应变分模态分解的非稳态闪变参数检测方法，通过构建新型中心差分解析能量算子（NCD_AEO），建立了基于AVMD改进NCD_AEO动态电压闪变参数检测方法；.分析了间谐波与闪变之间的量化关系，从信号调制理论的角度出发，推导由电压波动导致的间谐波参数和由间谐波导致的电压波动参数，通过定量关系的研究，揭示两者之间的关系，并提出了一种基于动态模态分解的间谐波闪变参数检测与闪变值计算方法，针对IEC方法存在的局限性，简化了IEC灯-眼-脑闪变测量过程，构建了电压间谐波闪变值简化计算新方法；.最后构建了一种同步ADC+高性能DSP+ARM架构的复杂电压闪变参数检测与分析实验平台和一种基于PXI和LabVIEW的电压闪变参数检测实验平台，形成一套完整且结合嵌入式系统实现的复杂闪变包络实时提取与闪变值简化计算新技术。.本项目执行期间在国内外高水平学术刊物发表了学术论文25篇，被SCI收录6篇、EI收录9篇、核心论文19篇（均标注基金资助），授权国家发明专利1项、申请国家发明专利4项，获得软件著作权2项，获得省部级一等奖励1项、社会力量奖励1项，依托本项目研究，培养博士研究生2名，硕士研究生17名。.本项目的研究成果可为复杂闪变参数预估、探寻闪变污染源提供新的研究思路和科学依据，同时，对地震地质灾害检测、多频率调制信号分析领域提供新的借鉴。