電圧形インバータにおける直流リアクトルの媒介によるPWM電力回生制御の一方式

概要

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For the voltage source type inverters, it is easy to improve the output waveforms, and the influence to the switching devices by the surge voltage is small. For power regeneration, however, it is necessary to add another converter to the AC power source. Among such converters for regeneration, the PWM converters have been often reported, which are excellent circuits. For the weak points, however, high cost could not be avoided as the capacities increase, because three AC reactors, and relatively high speed GTOs or power transistors should be employed.From such a viewpoint, the authors have investigated how to accomplish that the thyristor rectifier could be used even for regeneration. In the proposed equipment, the usual rectifier bridge can be also used for inversion through the medium of the DC reactor. The commonly used current smoothing reactor for rectification could be also used for the operation of this DC reactor. In the proposed method, by using one transistor of self commutation and six thyristors of external commutation, the PWM waveform control can be accomplished.For the frequency analysis of output current waveforms, the authors have proposed a frequency analysis method which can give definite output equations. The validity of its theory has been confirmed experimentally.
社団法人電気学会の論文