Аналіз енергоефективності активного випрямляча з покращеною гістерезисною системою керування

Abstract

The article describes the active three-phase boost rectifier with power factor correction, as known as active front-end rectifiers, with hysteretic control system in conditions of the ideal voltage and distorted voltage. In many industrial applications active front-end rectifiers (AFEs) have emerged as an attractive topology. When compared to traditional diode-based rectifiers, AFEs allow one to obtain sinusoidal input currents with low harmonic distortion, whilst at the same time providing an accurate rectifier voltage. Moreover, the amount of reactive power drawn from the source can be manipulated in order to reach a unity power factor in the input, or also to compensate a lack of reactive power in the source grid. Another area where AFEs play an important role is when a reduction of harmonic distortion is sought. In fact, this converter is widely used as an active filter in which case the AFE is connected in parallel to the nonlinear load thereby generating the harmonic currents necessary to reduce the pollution in the source. The research of the active rectifier was made in the Matlab R2011. Presented an improved hysteresis control system that allows improve the harmonic content generated by the phase currents and thus improve power factor in implementing the conditions of distortion of mains voltages.