Harmonic assessment-based adjusted current total harmonic distortion

The Journal of Engineering

Ahmed M. Ibrahim¹  Ahmed F. Zobaa³  Shady H.E. Abdel Aleem⁴ 

[1] Life Sciences, 15th of May Higher Institute of Engineering, 15th of May City, Helwan, Cairo 11731, Egypt;College of Engineering, Design and Physical Sciences, Brunel University London, Uxbridge, Middlesex UB8 3PH, UK;Electrical Power and Machines, Faculty of Engineering, Cairo University, Giza 12613, Egypt;Mathematical, Physical &

关键词: harmonic mitigation;    power transmission;    THD;    power factor correction;    frequency-dependent losses;    ohmic losses;    balanced nonsinusoidal system;    harmonic assessment-based adjusted current total harmonic distortion;    optimal C-type passive filter design;    distribution equipment;   

DOI  :  10.1049/joe.2016.0002

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

Power systems suffer from harmonic distortion and extra ohmic losses associated with them. Moreover, all harmonic frequencies are mostly assumed to have the same effect on the system losses. However, the frequency-dependency of the resistances should be taken into account, so that the apparent power and the power factor have to considerably reflect power losses under non-sinusoidal conditions. In this study, the difference between unweighted and weighted non-sinusoidal losses is addressed. A new harmonic-adjusted total harmonic distortion (THD) definition is proposed for both voltage and current. Besides, a new formula that relates the proposed harmonic-adjusted THD and a generalised harmonic derating factor definition of the frequency-dependent losses of the power transmission and distribution equipment is derived. An optimal C -type passive filter design for harmonic mitigation and power factor correction based on the minimisation of the proposed harmonic-adjusted THD for a balanced non-sinusoidal system is introduced. A comparative study of the proposed filter design based on the new harmonic-adjusted definition, and a conventional filter design based on standard THD definition, is presented.

【 授权许可】

CC BY