基于旋转因子变换插值的电压闪变检测算法

发布时间：2019-05-22 17:12

【摘要】：IEC 61000—4—15标准中的闪变仪是基于调幅波调制模型,需要经过一系列的二次方、滤波及统计等流程,其缺点是流程复杂,不利于数字闪变仪的设计。基于此,首先从数学模型上推导了IEC标准下闪变检测机理,为数字闪变仪的设计和校验提供理论依据;然后根据IEC闪变检测中存在的问题提出了基于旋转因子变换插值的闪变检测算法,通过对频谱进行旋转因子变换,再利用谱线叠加插值思想来抑制频谱泄漏和消除栅栏效应,实现了高精度估计间谐波参数,从而间接计算闪变参数。简化了闪变检测流程,减小了频谱泄漏的影响,使得闪变检测精度提高。所提方法还可以计算出多个调幅波分量的单独闪变贡献值,仿真和实际测量结果均验证了所提方法的准确性和有效性。
[Abstract]:The flicker in IEC 61000 / 4 / 15 standard is based on amplitude modulation model and needs to go through a series of quadratic, filtering and statistical processes. The disadvantage is that the process is complex and is not conducive to the design of digital flicker. Based on this, the flicker detection mechanism under IEC standard is deduced from the mathematical model, which provides a theoretical basis for the design and verification of digital flicker instrument. Then, according to the problems existing in IEC flicker detection, a flicker detection algorithm based on rotation factor transform interpolation is proposed. Through the rotation factor transformation of the spectrum, and then the spectral line superposition interpolation idea is used to suppress the spectrum leakage and eliminate the fence effect. The high precision estimation of inter-harmonic parameters is realized, and the flicker parameters are calculated indirectly. The flicker detection process is simplified, the influence of spectrum leakage is reduced, and the flicker detection accuracy is improved. The single flicker contribution values of multiple amplitude modulation wave components can also be calculated by the proposed method, and the accuracy and effectiveness of the proposed method are verified by simulation and practical measurement results.
【作者单位】：广东电网公司电力科学研究院;四川大学电气信息学院;
【分类号】：TM711

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