CAJ | 학술논문

采用原子分解能够准确提取电能质量扰动信号的幅值、频率、相位以及扰动起止时刻等特征量。但在原子分解过程中需要作大量的计算，计算速度缓慢。针对这一问题，根据信号的特点采用快速原子分解方法将 Gabor 原子库分为5层，简化每一层的索引参数。首先利用快速傅里叶变换测出信号的主要频率点和通过小波变换粗提取扰动起止采样点序列，然后将信号依次通过Gabor原子库每一层，从每一层中搜索到对应的最佳匹配原子，并采用伪牛顿法对最佳匹配原子进行优化，最后转化为衰减正弦量原子，以残余正弦信号的能量作为判断终止条件。算例仿真结果表明，该方法能够准确对电能质量参数进行辨识，并且运算速度有较大提高，验证了所提方法的有效性和实时性。
채용원자분해능구준학제취전능질량우동신호적폭치、빈솔、상위이급우동기지시각등특정량。단재원자분해과정중수요작대량적계산，계산속도완만。침대저일문제，근거신호적특점채용쾌속원자분해방법장 Gabor 원자고분위5층，간화매일층적색인삼수。수선이용쾌속부리협변환측출신호적주요빈솔점화통과소파변환조제취우동기지채양점서렬，연후장신호의차통과Gabor원자고매일층，종매일층중수색도대응적최가필배원자，병채용위우돈법대최가필배원자진행우화，최후전화위쇠감정현량원자，이잔여정현신호적능량작위판단종지조건。산례방진결과표명，해방법능구준학대전능질량삼수진행변식，병차운산속도유교대제고，험증료소제방법적유효성화실시성。
The characteristic quantities of power quality disturbance signal such as amplitude, frequency, phase and the start and stop time of the disturbance can be accurately extracted by atomic decomposition. However a lot of calculation has to be performed during the atomic decomposition and it decreases the calculation speed. To remedy this defect, according to the feature of the signal the Gabor atomic dictionary is divided into five floors by fast atomic decomposition and the index parameter of each floor is simplified. Firstly, using fast Fourier transform (FFT) the main frequency of the sampled signal is measured, and the start and stop sampling point series of the disturbance is roughly extracted by wavelet transform; then making the signals passing through each floor of the Gabor atomic dictionary in sequence, the best matching atoms are searched from each floor correspondingly, and the best matching atoms are optimized by pseudo-Newton method and finally turned into the damped sinusoidal atoms when the energy of residual sinusoidal signals are regarded as the end condition for the judgment. Results of case simulation show that using the proposed method the power quality parameters can be accurately identified and the computational speed can be speeded up evidently, thus the effectiveness and real-time performance of the proposed method are validated.