Universal analog computer model for three-phase controlled rectifier bridges

This work concerns an analog computer simulation of full-wave controlled rectifier bridges, which are fundamental for any conversion of alternating current to direct current. The control of rectifier bridges is realized with the aid of logical components. In spite of the comparative simplicity of the power scheme, the transitional processes in converters can be complicated, particularly when the converter is operated abnormally. The simulation of rectifier bridges presents some difficulty when using a potentially unstable model. Usually instability of a model occurs because of the presence of closed loop circuits which have an even number of amplifiers or because of inaccurate mathematical descriptions of the real system. Practically until recently there have been no universal analog computer diagrams to study the electromagnetical processes in converter bridges under stationary, transitional and emergency conditions of the rectifier bridge. A method akin to that used in servosystems is used for the simulation of the rectifier bridges. Only one analog computer diagram is obtained and it gives stable solutions for any condition of the bridge. The accuracy of the simulation was determined by comparing the computer outputs to recordings taken from an actual system used in The Institute of Machine Construction, Zaporozhje, U.S.S.R. The simulation resulted in good correlation between computer solutions and experimental data for a wide set of problems in the area of energy conversion systems.