Method for controlling a power drive system
First Claim
1. A method to control a variable-speed high-power drive system that comprises at least one three-phase motor that is designed for constant input power above a specified speed and is fed from an intermediate circuit converter with a variable intermediate circuit voltage, whereby the intermediate circuit converter is fed from a power line and whereby the intermediate circuit voltage in the speed range below the specified speed is reduced from its maximum value such that the intermediate circuit voltage is not reduced below a minimum voltage specified by the power supply voltage that occurs during operation, the method comprising the steps of:
- (a) transitioning the intermediate circuit voltage, in a speed dependent manner, from the reduced intermediate circuit voltage to the maximum intermediate circuit voltage in the speed range above the specified speed to a maximum speed; and
(b) above the specified speed and up to the maximum speed, and thereby in the lower range of the torque to be generated or braked by the drive motor, keeping the intermediate circuit voltage at least approximately at the low level that it has below the specified speed up to the maximum speed.
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Accused Products
Abstract
To minimize the energy required for operation of a rail vehicle, in a drive system that has an intermediate circuit converter 1 and a three-phase motor 7 fed by it, the intermediate circuit voltage in the intermediate circuit 12 and/or the magnetic flux in the drive motor 7 are optimized to correspond to the actual operating requirements, including, if necessary, the energy expenditure for the auxiliaries 9 that are provided to cool the components.
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Citations
20 Claims
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1. A method to control a variable-speed high-power drive system that comprises at least one three-phase motor that is designed for constant input power above a specified speed and is fed from an intermediate circuit converter with a variable intermediate circuit voltage, whereby the intermediate circuit converter is fed from a power line and whereby the intermediate circuit voltage in the speed range below the specified speed is reduced from its maximum value such that the intermediate circuit voltage is not reduced below a minimum voltage specified by the power supply voltage that occurs during operation, the method comprising the steps of:
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(a) transitioning the intermediate circuit voltage, in a speed dependent manner, from the reduced intermediate circuit voltage to the maximum intermediate circuit voltage in the speed range above the specified speed to a maximum speed; and
(b) above the specified speed and up to the maximum speed, and thereby in the lower range of the torque to be generated or braked by the drive motor, keeping the intermediate circuit voltage at least approximately at the low level that it has below the specified speed up to the maximum speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A control device to control a variable-speed high-power drive system comprising at least one three-phase motor that is designed for constant input power above a specified speed and is fed from an intermediate circuit converter with a variable intermediate circuit voltage, whereby the intermediate circuit converter is fed from a power line and whereby the intermediate circuit voltage in the speed range below the specified speed is reduced from its maximum value such that the intermediate circuit voltage is not reduced below a minimum voltage specified by the power supply voltage (contact line voltage) that occurs during operation, and in the speed range above the specified speed, starting from the reduced intermediate circuit voltage, there is a speed-dependent transition to the maximum intermediate circuit voltage at maximum speed, wherein, in the drive system, the intermediate circuit voltage at speeds of the drive motor in a block mode of the power inverter and thereby in the lower range of the torque to be applied or braked by the drive motor is controlled at least approximately to a value that corresponds to the intermediate circuit voltage in the intermediate circuit below the specified speed of the drive motor, and is set so that at each operating point, the result is a minimum overall power loss for the overall drive system.
Specification