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CONTROL SYSTEM FOR THE VOLTAGE SOURCE DC LINK CONVERTER IN THE ROTOR CIRCUIT OF A SLIP RING INDUCTION MACHINE
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| Author(s) |
Helmut Weiss; Markus Lampersberger |
| Abstract |
The rotating system tie frequency converter of the German Railways, Hamburg-Harburg E2 incorporates a double-fed induction motor. Torque control is accomplished by a voltage
source PWM-inverter at the rotor circuit. The power transfer operation rotational speed of this machine set is within few percent fluctuation near synchronous speed. For such a system, only the slip power - according to slip only a few percent of actual active power - has to be transferred at the rotor by means of the PWM-inverter. Slip power is transferred from/to the DC-link via a line commutated inverter / rectifier. The same power electronics circuit enables
accelation of the machine set from zero to synchronous speed when the stator of the induction motor is short-circuited and the rotor is fed by the PWM-inverter. The control system has to accomplish
these quite different modes of operation including synchronization. Line failures cause extreme high machine currents. The control system failure reaction circuit is triggered by
these overcurrents, sets the system to a secure state without opening the circuit breakers and regaines standard operation automatically. The original control system for acceleration, regular
and transient operation has been tested at a laboratory model before ifs delivery to the plant. |
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| Filename: | Unnamed file |
| Filesize: | 611.2 KB |
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| Type |
Members Only |
| Date |
Last modified 2016-04-04 by System |
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