DEPENDENCE OF THE VOLTAGE ON THE POWER ELECTRIC DIODES OF THE COMPENSATION CONVERTER ON THE FREQUENCY OF THE TRANSISTOR REVERSALS OF THE COMMUTATING LINK

Abstract

Studies of compensation-type electrical energy converters, conducted both by the authors of the publication and by other scientists, show that their energy characteristics and operating conditions of power equipment depend on commutating voltages. The tested three-phase bridge compensation converter contains one commutating link consisting of a three-phase capacitor battery and a three-phase group of fully controlled devices. The latter are a capacitor bank switch, performing the functions of switching capacitors in such a way as to ensure the energy process of the converter, in which its reactive energy is compensated, or generated, if necessary. At the same time, the operating conditions of the power equipment of the converter also change. The main content of the study is the analysis of the components of the reverse voltage of the power electric diodes of the compensation part of the converter and the dynamics of its change at an increased frequency of control pulses of the transistors of the commutating link. This is required when determining the class of diodes in the case of introducing a converter according to the scheme under study into production. The question of the class of diodves is considered in the context of the energy capabilities of the converter when regulating the operating mode according to the requirements of the technological process. The results of the research relate to the control of transistors of the commutating link by pulses of double, quadruple and eightfold frequency. As a result, relationships were obtained for calculating the maximum instantaneous value of the reverse voltage of electric power diodes in various operating modes of the converter. The ranges of the delay in the moment of supply of control pulses to the transistors of the commutating link are revealed. The generalized conclusion shows that on the electric power diodes of the compensation part of the converter, the reverse voltage does not exceed the voltage on other valves. Refer. 11, fig. 12.