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The modeling of harmonic source based on harmonic measurement is put forward for the first time. Three-phase fundamental and harmonic models of the whole power system are built in the paper. Then, the power system harmonics penetration (PSHP) software package is developed on VC++ circumstance. Zhengzhou, Luoyang and Sanmengxia electric power system in Henan grid are studied, and the harmonics and...
Direct current through directly-grounded neutrals of nearby AC transformers may induce DC biases of transformers when high voltage direct current transmission (HVDC) system operates on ground return mode, thus producing negative impact on the AC system. This paper introduced the influence of DC bias to transformer and its research efforts. The suppression measures of DC bias were analyzed .
Two kinds of different arrangements on harmonic-suppressed winding with LC filters is studied in this paper, based on the principle of CRT with simplex control winding. According to the analysis of Equivalent circuit of three-winding transformer, the effect of harmonic-suppressed is optimum when harmonic-suppressed winding is placed between control winding and work winding.The Simulation model of...
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