基于通用信号延迟叠加算子的电能计量非正弦谐波信号检测

Non-sinusoidal Harmonic Signal Detection for Electric Energy Metering Based on Generalized Signal Delay Superposition Operator

非正弦负载电流作用下,电能表存在周期性谐波信号,对此,提出基于通用信号延迟叠加算子的电能计量非正弦谐波信号检测方法。基于通用信号延迟叠加算子,获取谐波频率信号和其对应正交信号,基于广义S变换处理获取的谐波频率信号后,可得出对应时间、频率采样点时信号的幅值和相位信息;通过三线谱插值计算谐波和间谐波参数,采用自适应噪声的完全集合经验模态分解,检测非正弦谐波信号。测试结果显示,所提方法变换性能良好,能够可靠完成谐波信号的变换处理并获取信号的IMF分量结果。频率、幅值和相位的检测误差结果最大值分别为0.00037、0.00042和0.00039,最高有效率达到99.54%,可有效实现电能计量非正弦谐波信号检测。

Under the action of non-sinusoidal load current,there is a periodic harmonic signal in the electricity meter,so the detection method of non-sinusoidal harmonic signal based on generalized delayed signal superposition operator is proposed.Based on generalized delayed signal superposition operator,the harmonic frequency signal and its corresponding orthogonal signal are obtained.After processing the harmonic frequency signal obtained by the generalized S transform,the amplitude and phase information of the signal at the corresponding time and frequency sampling point can be obtained.The harmonic and inter-harmonic parameters are calculated through the three-point line interpolation,and the complete ensemble empirical mode decomposition of adaptive noise is used to detect the non-sinusoidal harmonic signal.The test results show that the proposed method has good transformation performance,and can reliably complete the harmonic signal transformation processing and obtain the IMF component results of the signal.The maximum error results of frequency,amplitude and phase detection are 0.00037,0.00042 and 0.00039 respectively,and the maximum efficiency is 99.54%,which can effectively detect non-sinusoidal harmonic signal in electric energy metering.