Advanced current control method and apparatus for a motor drive system
First Claim
1. An apparatus for controlling a power converter of an AC motor drive system, said power converter outputting multi-phase AC current to an AC motor, said apparatus comprising:
- a state selecting unit for selecting an operation mode, from among a plurality of operation modes, for said AC motor based on system real-time operating conditions, the plurality of operation modes including a normal mode, a power interruption mode, a fault protection mode, and a power-up/down dynamic mode, said system operating conditions including DC voltage available to said power converter, motor load condition, and motor speed command; and
an advanced controller for controlling multi-phase AC current output from said power converter to said motor in accordance with the operation mode selected by said state selecting unit, said advanced controller generating a current control reference value that is based on the selected operation mode to achieve current control under various operating conditions of said motor drive system.
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Abstract
An apparatus controls a power converter of an AC motor drive system, the power converter outputting multi-phase AC current to an AC motor. The apparatus comprises: a state selecting unit; and an advanced controller. The state selecting unit selects an operation mode, from among a plurality of operation modes, for the AC motor based on system real-time operating conditions, the plurality of operation modes including a normal mode, a power interruption mode, a fault protection mode, and a power-up/down dynamic mode. The system operating conditions include DC voltage available to the power converter, motor load condition, and motor speed command. The advanced controller controls multi-phase AC current output from the power converter to the motor in accordance with the operation mode selected by the state selecting unit. The advanced controller generates a current control reference value that is based on the selected operation mode to achieve current control under various operating conditions of the motor drive system.
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Citations
21 Claims
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1. An apparatus for controlling a power converter of an AC motor drive system, said power converter outputting multi-phase AC current to an AC motor, said apparatus comprising:
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a state selecting unit for selecting an operation mode, from among a plurality of operation modes, for said AC motor based on system real-time operating conditions, the plurality of operation modes including a normal mode, a power interruption mode, a fault protection mode, and a power-up/down dynamic mode, said system operating conditions including DC voltage available to said power converter, motor load condition, and motor speed command; and an advanced controller for controlling multi-phase AC current output from said power converter to said motor in accordance with the operation mode selected by said state selecting unit, said advanced controller generating a current control reference value that is based on the selected operation mode to achieve current control under various operating conditions of said motor drive system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15)
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12. A method of controlling a power converter of an AC motor drive system, said power converter outputting multi-phase AC current to an AC motor, said method comprising:
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selecting an operation mode, from among a plurality of operation modes, for said AC motor based on system real-time operating conditions, said plurality of operation modes including a normal mode, a power interruption mode, a fault protection mode, and a power-up/down dynamic mode, said system operating conditions including DC voltage available to said power converter, motor load condition, and motor speed command; and controlling multi-phase AC current output from said power converter to said motor in accordance with the selected operation mode, said step of controlling including generating a current control reference value that is based on the selected operation mode to achieve current control under various operating conditions of said motor drive system. - View Dependent Claims (13, 16, 17, 18, 19, 20)
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21. An apparatus for controlling a power converter of an AC motor drive system, said power converter outputting multi-phase AC current to an AC motor, said apparatus comprising:
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a state selecting unit for selecting an operation mode, from among a plurality of operation modes, for said AC motor based on system real-time operating conditions, the plurality of operation modes including a normal mode, a power interruption mode, a fault protection mode, and a power-up/down dynamic mode, said system operating conditions including DC voltage available to said power converter, motor load condition, and motor speed command; and an advanced controller for controlling multi-phase AC current output from said power converter to said motor in accordance with the operation mode selected by said state selecting unit, said advanced controller generating a current control reference value that is based on the selected operation mode to achieve current control under various operating conditions of said motor drive system, wherein, during said fault protection mode, said controller generates a current control reference value to reduce torque current to substantially zero without shutting down operation of said power converter, wherein, during said power interruption mode, said controller generates a current control reference value to control said motor to operate as a generator for charging a DC bus.
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Specification