The Dynamic Operation Investigation of an Active Rectifier Control System with IGCT-Thyristor Switching Angle Table Selection Function

The paper investigates the dynamic operation modes of frequency converter active rectifiers with the previously proposed improved control system. This control system allows the use of IGCT thyristors switching angle tables with different switching frequencies depending on the operating mode of the frequency converter. The tables were changed when the equal control signals to the power switches of the active rectifier were generated using the current and the new tables. The research has been performed on the previously developed simulation model in the Matlab-Simulink software package. The analysis of the research results has shown the minimum disturbing effects on the regulated parameters of the active rectifier when changing the tables.

I. Introduction

In-plant power supply systems for industrial plants in Russia are often confronted with electromagnetic compatibility problems [1]–[5]. One of the main sources of electromagnetic interference is powerful frequency converters with active rectifiers (FC with AR) [1]–[6]. Operation of such converters can disrupt normal functioning of other power consumers in a power supply distribution system of an enterprise, lead to emergency modes or failure of electric receivers [1], [2]. Such problems are most brightly shown in existing power supply systems, where electric drives with AR drives appear as a modernization result of technological units [1], [2]. Insufficient power of power lines, connection of sensitive electric receivers in parallel with powerful converters, wrong choice or wrong adjustment of converters or their elements can lead to EMC problems in power supply systems with powerful FC with AR [1], [4].