Power converter controlling apparatus and method providing ride through capability during power interruption in a motor drive system
First Claim
1. A power converter controlling apparatus for controlling a power converter of a motor drive system, said controlling apparatus comprising:
- a current controller, which outputs gating signals to said power converter as a function of a torque current reference and a flux current reference; and
a torque current reference generator, which generates the torque current reference used by said current controller, whereinsaid current controller controls said power converter during a first operating mode to create torque current flowing from said power converter to the motor to achieve desired motor speed;
controls the power converter in a second operating mode, initiated when power to said power converter is interrupted, so that negative torque current between said power converter and said motor draws mechanical energy from said motor and charges an element on a power supply side of said power converter; and
controls the torque current between said power converter and said motor to limit maximum transient bus voltage;
wherein said torque current reference generator;
monitors DC bus voltage between said power converter and the power supply;
compares the monitored DC bus voltage to a reference value; and
controls a torque current reference based on the result of said comparing step to limit a maximum DC bus voltage during transition between the first and second operating modes.
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Accused Products
Abstract
A method of controlling a power converter (20) of a motor drive system (10)controls the power converter (20) during a first operating mode by applying a current control scheme, which sets power converter commands to control torque current flowing from the power converter (20) to the motor (30) to achieve desired motor speed; and initiates a second operating mode when power supply to the power converter (20) is interrupted. The second operating mode includes controlling negative torque current between the power converter (20) and the motor (30) so that mechanical energy from the motor (30) charges an element (58) on a power supply side of the power converter (20). The first operating mode is resumed when the input power recovers. Torque current between the power converter (20) and the motor (30) is also controlled to limit a maximum transient DC bus voltage.
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Citations
13 Claims
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1. A power converter controlling apparatus for controlling a power converter of a motor drive system, said controlling apparatus comprising:
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a current controller, which outputs gating signals to said power converter as a function of a torque current reference and a flux current reference; and a torque current reference generator, which generates the torque current reference used by said current controller, wherein said current controller controls said power converter during a first operating mode to create torque current flowing from said power converter to the motor to achieve desired motor speed; controls the power converter in a second operating mode, initiated when power to said power converter is interrupted, so that negative torque current between said power converter and said motor draws mechanical energy from said motor and charges an element on a power supply side of said power converter; and controls the torque current between said power converter and said motor to limit maximum transient bus voltage; wherein said torque current reference generator; monitors DC bus voltage between said power converter and the power supply; compares the monitored DC bus voltage to a reference value; and controls a torque current reference based on the result of said comparing step to limit a maximum DC bus voltage during transition between the first and second operating modes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification