Abstract: A method for control of a static valve converter consists of determining the difference between the actual and desired control pulse phases by the use of an equidistant pulse sequence, the frequency of which being equal to the coversion frequency, the pulse sequence phase being selected so that the mean difference between the equidistant pulse phase and the phase of the respective control pulses of all valves is equal to zero, and the pulse phase difference being determined for each individual valve. A control pulse automatic balancing unit incorporated in an apparatus for realizing the method of the present invention comprises an equidistant pulse sequence assembly, a shaping element, correcting signal circuits and logical AND elements equal in number to the number of conversion phases, and also logical circuits equal in number to the number of coversion phases. Each logical circuit comprises two logical AND elements, and a logical OR element connected to the outputs of the AND elements.

Abstract: The phase control arrangement of a valve converter according to the invention comprises a control signal former having one input connected to the valve converter and another input connected to a reference signal unit. The output pulse from the control signal former is fed, concurrently with the output signal of a sawtooth oscillator, to a zero element having its output connected, via a phase limiter, to the input of the control pulse generator. Control pulses are distributed among the converter valves by means of a pulse distributor. The sawtooth oscillator has two inputs of which one is connected to the input of the pulse distributor and the other is connected to the output of the control signal former. The arrangement provides for correspondence of performance parameters of the converter to the preset values and maximum response speed in transient conditions.