New solutions for direct frequency converter as voltage regulator

摘要

The new working possibilities of a direct frequency and voltage converter have been studied in the new range of low value modulating frequency, and also the formation of output voltage from regularly modulated input voltage values which are summed in the load circuit with the help of a voltage regulator. This technical solution is based on the analysis of sinusoidal (ideal) process frequency conversion in the feasible frequency range with a subsequent real substitution of these processes in the intervals which provide maximum compliance with both the output voltage formation demands and line commutation conditions. It is implemented in composing computer management software and implementing it by microprocessor control in the converter. As a result, line commuted direct frequency converter output frequency can be increased up to its input frequency value, and output voltage value can be regulated effectively and with a small number of commutations, simultaneously ensuring the required output voltage quality for the purposes of AC regulated electric drive.