CAJ | 학술논문

谐波污染给电力系统带来多方面的危害，对污染责任进行定量划分已经成为电能质量管理中刻不容缓的问题。已有文献主要针对背景谐波不变的情况，而实际中背景谐波是随时间发生变化的。文章提出了细分复数域极大似然估计方法，实现了在背景谐波波动情况下等效谐波阻抗的准确计算，并进而定量确定关注谐波源对特定母线的谐波污染责任。通过将波动的背景谐波细分成变化分量和近似不变分量，推导得到了以矩阵语言表达的细分复数域极大似然估计方法。对IEEE 14节点系统进行仿真，结果表明所提方法在背景谐波波动情况下计算关注谐波源对特定母线的谐波污染责任是有效的。
해파오염급전력계통대래다방면적위해，대오염책임진행정량화분이경성위전능질량관리중각불용완적문제。이유문헌주요침대배경해파불변적정황，이실제중배경해파시수시간발생변화적。문장제출료세분복수역겁대사연고계방법，실현료재배경해파파동정황하등효해파조항적준학계산，병진이정량학정관주해파원대특정모선적해파오염책임。통과장파동적배경해파세분성변화분량화근사불변분량，추도득도료이구진어언표체적세분복수역겁대사연고계방법。대IEEE 14절점계통진행방진，결과표명소제방법재배경해파파동정황하계산관주해파원대특정모선적해파오염책임시유효적。
Harmonic pollution will cause many negative effects on the power system. Harmonic contributions determi-nation has become an urgent problem in the power quality management. Existing literatures on harmonic contributions determination mainly discuss the cases when the background harmonics remain constant, while the background har-monics fluctuate with time in the real power system. To achieve the accurate calculation of equivalent harmonic imped-ance in the case of background harmonics fluctuation, the subdivision complex maximum likelihood estimation method is proposed in the paper, by which harmonic contributions of the harmonic source of concern on the specific bus can be deduced. By dividing the background harmonic into changing component and approximate unchanging component, the matrix expression of subdivision complex maximum likelihood estimation method is derived. A case study based on the IEEE 14-bus test system is conducted, the results of which show that the proposed method is valid for harmonic contributions determination in the case of the background harmonics fluctuation.