Research On Testing Analytic Mechanism And Controlling Technology Of Harmonic Wave In Power System

With the rapid development of the industrial manufacture and electronic technology, the electronic equipment and trading devices become more prevalent in the various fields. The interference of some non-linearity loads as frequency conversion, commutate equipment, transfuses a large quantity of harmonic wave into the power system. The growing tendency of the abnormity and accident which caused by the harmonic wave has already become the social harmfulness in the power system.Combining the situation of the power system and various electro-equipments in the steel industry of our country, this dissertation summarizes the cause and the source of the harmonic wave in the power system, analyzes the possible harmfulness to the electric devices and expounds the necessity and significance of inspection and comprehensive control in the system.This thesis explores an applied testing analytic mechanism and its controlling technology of harmonic wave in steel industrial power system by an introduction of the producing background and status of harmonic wave in electric system of the steel industry, a contrast analysis between the main restraining technology of the harmonic wave and current controlling technologies in the power system, and a further study of harmonic wave controlling devices which includes setting composing, controlling strategy, controlling principle, technology actualization. And it proposes a united compensation principle based on wave form, i.e. regards the reactive current, harmonic wave and negative current in the system as an aberrance wave form, adopt a synthesis control technology linking APF compensation with PF compensation. Therefore it offers a scientific foundation for the future systematic reconstruction, equipment selection and plan and administration of the power system.Studies tell that this compensation measure is an effective way to improve the quality of the power system. It reduces the influence of interfering load, increases the quality of power system in steel industry, decreases the circulating malfunction of the system, lessens the affect of the harmonic wave to electro-equipments, ensures the normal processing and depresses the economic expense of enterprises.