METHOD OF CONTROL OF TETRASQUARE CONVERTER WITH COMPUTATION OF SWITCHING PHASES AND MICROPROCESSOR DEVICE TO IMPLEMENT METHOD Russian patent published in 2008 - IPC H02M7/53862 H02P27/08 B60L9/16 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and may be used to control the electric train AC. The invention increases the accuracy in control of the converter and eliminates alarm operating conditions. The method of control of tetrasquare converter with computation of switching phases includes generating the data on the dependency of the gate switching intervals on the depth of modulation and inputting this data into the memory of the converter control system for the range of tolerable operating frequencies in compliance with the number of the PWM-intervals. The control system is used to preset the current voltage value at the converter output, the current circuit value and the value of phase difference between the circuit voltage and current. The circuit current value id regulated by varying the voltage modulation at the converter input. The intervals of the controlled gates switching are calculated and the voltage modulation value is varied by setting the control signal for cutting in- cutting off the gates. The method features the correction of the gates cutting in interval values allowing for certified data on controlled gates, operating conditions and the converter load nature. Here, in every half-cycle of the supply voltage, the maximum modulation frequency is limited by the gate switching duration. The microprocessor device to control the said converter incorporates a timer, a processor, an operating memory, a permanent memory, ANC, drivers' unit, current sender, synchroniser and the input current amplitude generator, timer inputs-outputs, those of the processor, permanent memory, operating memory. The drivers' unit inputs are coupled by the data-address bus. It also includes the converter operation parameters generator, voltage sender, gate switching phase computation unit, the unit of limiting switching intervals, the time interval I/O unit, the unit of communication with the converter load.

EFFECT: higher accuracy of control over converter, ruling our abnormal operating conditions.

2 cl, 3 dwg