H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/103
H02P 25/02 (2006.01)
Patent
CA 1193318
TERMINAL VOLTAGE LIMIT REGULATOR FOR A LOAD COMMUTATED INVERTER ABSTRACT OF THE DISCLOSURE A control system for a load commutated inverter AC synchronous motor drive provides an operational shift- in the event of an increase in motor terminal voltage VTERM above a preselected reference level. Under such an increase in terminal voltage, control is transferred from a condition where torque is controlled by current and the terminal voltage is uncontrolled to a condition where the load current, e.g., the DC link IL flowing between a source side thyristor converter (AC to DC) 12 and a load side thyristor inverter (DC to AC) 14 is utilized to control the motor terminal voltage while the firing angle of the thyristor inverter 14 is used to control the motor torque. This involves increas- ing the minimum load or motor drive current for a desired torque while adjusting the inverter firing angle from a previous value, so that the desired torque is provided than before. Such an operational shift, in effect, uses a component of the load current to demagnetize the motor field in order to maintain the motor terminal voltage at an acceptable level.
414546
Company General Electric
Eckersley Raymond A.
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