PHASE CONTROL METHOD OF THYRISTOR CONVERTERS SIMULTANEOUSLY OPERATING FOR INDIVIDUAL LOADS

摘要

FIELD: electricity.SUBSTANCE: invention relates to electrical engineering and can be used on alternating-current electrically propelled vehicles. In a method of phase control of two or more thyristor converters simultaneously operating for individual loads and fed from one AC network, pulses of different converters are supplied with an offset between each other through angle ?? that is chosen as equal to maximum ??, if control pulses are in the middle part of the half-period of supply voltage, it is smoothly increased from zero to ??in the range of 0 electrical degrees of supply voltage between straight lines ??=?*??/18 and ??=?*??/54, where ? - angle of output of the first control pulse (electrical degrees), and it is smoothly decreased from ??to zero at control angles approaching to 180 electrical degrees between straight lines ??=(180-?)*??/18 and ??=(180-?)*??/54. Angle ??is chosen within 1-18 electrical degrees.EFFECT: increasing an angle of pulse delay up to 18 electrical degrees in the middle part of the half-period of voltage and reducing maximum capacity of full load of thyristor converters.1 dwg