| It is common understanding that harmonic wave has public harmfulness to electric power system and other aspects on which electro-load's safety running is influenced. This article links with practice of Pangang Group power supply and distribution system, along with electro-equipments, analyzes the capital equipments and reasons which harmonic wave is caused, sets forth harmonic's harmfulness to power supply and distribution system, as well as to electro-equipments.It summarizes and analyzes the main harmonic restraining technology at home and abroad in this article, probes the advanced harmonic restraining technology which shall be applicable to Pangang Group power supply and distribution system. It shall also provide scientific explains for electro-equipments' selection, reconstruction and management of power supply and distribution system for Pangang Group in the near future.The electric power harmonic comprehensive control system with low cast and high security is applied in this article. It adopts that sourced compensation links with non-sourced compensation herewhich the former is realized by high frequency PWM control technology and the latter is carried out by crystal switch formed by non-flow and over-voltage. It can realize stepless modulation with imaginary power, mightiness compensation of harmonic and negative electricity, and circuitry consumption debasing are achieved.Via in-depth research on structure, principle, technology realization and tactic of the electric power harmonic comprehensive control system, it analyzes the effect of applications, explores the electric power harmonic comprehensive control system which is applicable to Pangang Group power supply and distribution system. Its utilization can improve power supply, reduce systematic troubles, decrease harmonic's effects on electro-equipments, guarantee regular running of production and enhance economic profits of the whole company.
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