非整周期采样条件下有功电能计量的新算法
发布时间：2018-11-13 17:13
【摘要】：非整周期采样条件下,应用FFT算法对信号进行分析时,会产生频谱泄漏,从而使有功电能的计量产生误差。在明确基波有功电能和谐波有功电能的定义,并证明负载所消耗的总有功电能与电压电流信号的频谱之间存在一定关系基础上,提出一种基于谐波子组加窗FFT的有功电能计量新算法。类似于IEC标准中谐波子组的分组方法,对加窗信号的频谱进行分组,并基于加窗前后信号总有功电能保持不变而得到电能恢复系数;同时,应用谐波子组内谱线的参数信息测算出基波有功电能和谐波有功电能值。数值仿真分析和实际应用验证发现,若该新算法配合以Hanning窗进行信号处理,其在测算基波有功电能和谐波有功电能时均具有较高的准确度。
[Abstract]:Under the condition of non-integer periodic sampling, the spectrum leakage will occur when the signal is analyzed by the FFT algorithm, thus the measurement error of the active power can be caused. Based on the definition of fundamental active power and harmonic active power, it is proved that there is a certain relationship between the total active power consumed by load and the spectrum of voltage and current signal. A new algorithm for active energy measurement based on harmonic subgroup windowed FFT is proposed. Similar to the grouping method of harmonic subgroup in IEC standard, the spectrum of windowed signal is grouped, and the power recovery coefficient is obtained based on the total active power of the signal before and after windowed. At the same time, the fundamental active power and harmonic active power are calculated by using the parameter information of the spectrum line in the harmonic subgroup. Numerical simulation and practical application show that if the new algorithm is combined with Hanning window for signal processing, it has a high accuracy in measuring the fundamental and harmonic active power.
【作者单位】： 清华大学电力系统及发电设备控制和仿真国家重点实验室;
【基金】：国家高技术研究发展计划(863计划)(2015AA050404)项目资助
【分类号】：TM933.4
本文编号：2329806
[Abstract]:Under the condition of non-integer periodic sampling, the spectrum leakage will occur when the signal is analyzed by the FFT algorithm, thus the measurement error of the active power can be caused. Based on the definition of fundamental active power and harmonic active power, it is proved that there is a certain relationship between the total active power consumed by load and the spectrum of voltage and current signal. A new algorithm for active energy measurement based on harmonic subgroup windowed FFT is proposed. Similar to the grouping method of harmonic subgroup in IEC standard, the spectrum of windowed signal is grouped, and the power recovery coefficient is obtained based on the total active power of the signal before and after windowed. At the same time, the fundamental active power and harmonic active power are calculated by using the parameter information of the spectrum line in the harmonic subgroup. Numerical simulation and practical application show that if the new algorithm is combined with Hanning window for signal processing, it has a high accuracy in measuring the fundamental and harmonic active power.
【作者单位】： 清华大学电力系统及发电设备控制和仿真国家重点实验室;
【基金】：国家高技术研究发展计划(863计划)(2015AA050404)项目资助
【分类号】：TM933.4
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