EMC IMPROVMENT RESEARCH OF THREE-PHASE ACTIVE RECTIFIERS WITH POWER FACTOR CORRECTION IN REGENERATIVE MODE
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2018, Vol 178, Issue 12
Abstract
One of promising areas of energy efficiency in railway transport is application of four-quadrant AC/DC converter with high power factor on the traction substations. The thyristor and diode three-phase rectifiers, which used on the AC/DC traction substations, have a number of drawbacks. In some cases, they do not provide the ability to recover energy, but also they are powerful source of current harmonic for general industrial electric grid. The presence of higher harmonics in power grid has the following negative consequences: distortion of the supply voltage; pickup in telecommunication and control circuits; heating and additional losses in transformers and electrical machines, which are powered from the power supply system; reducing the efficiency of the power supply system and technical devices. There are various topologies of active rectifier circuits for correction of power factor. However, it is worth noting that not all topologies of active rectifiers allow to implement bidirectional energy transfer. Neither VIAA rectifier circuit nor single-circuit three-phase rectifiers do not realize recovery. An optimal circuit for the recovery is the circuit of an active three-phase booster rectifier. The circuit allows to control the output voltage in the active rectifier mode, as well as the power factor close to one, both in the active rectification mode and in the recuperation mode. There are various control systems for active rectifier with correction of power factor. The most promising control systems are: hysteresis control system, vector control system and direct power control system. A significant advantage of a hysteresis control system is its relative simplicity of implementation, high reliability, high realized power factor. The disadvantage of hysteretic control system is the inability to implement the recovery process. In the work, the control system AB is proposed, which implements recovery with a high power factor. This article provides an overview of four-quadrant power conversion of active rectifier. This scheme allow implementation the following options: power factor correction, sinusoidal input current, eliminating harmonic in input current, regulation of the output voltage of the rectifier, energy recovery in the network. The article presents the optimal control scheme for three-phase four-quadrant AC/DC converter.
Authors and Affiliations
Volodymyr Nerubatskyi, Alexandr Plakhtiy, Angelina Gladka
Keywords
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- EP ID EP380171
- DOI 10.18664/1994-7852. 178.2018.138906
- Views 44
- Downloads 0
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