Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
2000-02-29
2000-12-26
Han, Jessica
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 40, 363 44, 363 84, 363 95, H02M 7155
Patent
active
061669296
ABSTRACT:
A multi-motor drive in which the resonance existing between one or more output filter capacitors of a current source inverter and an a.c. induction motor is reduced. The inverter features a switching pattern generator which controls the power switches of the inverter based on a reference current. A control loop, connected to the switching pattern generator, measures the load current or voltage and generates a nominal reference current based on an error therein; determines a damping current based on the voltage at the terminal; and determines the reference current supplied to the switching pattern generator by subtracting the damping current from the nominal reference current. The invention essentially simulates the use of a physical damping resistor connected in parallel with each output filter capacitor, but without the corresponding energy loss. This form of active damping control is also applied to a resonance mode existing between the input filter capacitors of a PWM-based rectifier and the system inductance of a power source.
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Ma Daming
Rizzo Steven C.
Wu Bin
Zargari Navid R.
Han Jessica
Horn John J.
Porat Alex
Rockwell Technologies LLC
Walbrun William R.
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