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US 2016/0111953 A1Published application
Apparatus and method for restarting medium voltage inverter
AssigneeLsis Co., Ltd.
InventorsBEOM SEOK CHAE, SEUNG CHEOL CHOI
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Abstract
An apparatus for restarting a medium voltage inverter is disclosed, wherein the medium voltage inverter can be restarted by estimating a rotor speed when an input power returns from an instantaneous defective state to a normal state, whereby a time to restart the medium voltage inverter can be reduced by a simple configuration to dispense with the need to wait until the rotor speed reaches zero speed.
Claims11
An apparatus for restarting a medium voltage inverter, the apparatus comprising:
- a measurement unit configured to measure an input voltage of a motor;
- an estimation unit configured to estimate a rotor frequency of the motor using the input voltage;
- and
- a controller configured to controllably change an output voltage or an output frequency of the inverter in response to a first ratio corresponding to a frequency relative to a predetermined voltage using the input voltage and the rotor frequency, wherein
- the estimation unit includes,
- a generation unit configured to generate a first voltage applied to the motor by the inverter and a second voltage substantially lagging by 90° in phase from the first voltage,
- a determination unit configured to determine a control bandwidth for determining a frequency of the output voltage of the motor, and
- a second detection unit configured to determine the rotor frequency based on the control bandwidth.
5 more elements
A method for restarting a medium voltage inverter, the method comprising:
- generating a first voltage applied from an input voltage of a motor to the motor and a second voltage substantially lagging by 90° in phase from the first voltage;
- determining a control bandwidth to determine a frequency of an output voltage of the motor;
- and
- estimating a rotor frequency of the motor based on the control bandwidth.
1 more element
Dependencies are inferred from the claim text.