Apparatus for parallel operation of pulse-width modulation power converters

Patent metadata

Field	Value
Publication number	US-9257934-B2
Application number	US-201214371657-A
Country	US
Kind code	B2
Filing date	Dec 11, 2012
Priority date	Jan 12, 2012
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

To perform an anti-windup control without interference with a cross current compensating function even in case of voltage saturation.
There is provided a feedback value calculating section to calculate an average of voltage commands V 1 _cmd, V 2 _cmd after output limitation, as a feedback value. As a deviation used for an integral calculation of a current control section 6 a, 6 b , a sum obtained by adding a product to a deviation between a current command value Id_cmd, Iq_cmd and a current detection value Id_det, Iq_det is used. The product is a quantity obtained by multiplying a saturation quantity by a feedback gain Kfb. The saturation quantity is a saturation quantity of an operation quantity limited by a voltage command limiting section 3 a, 3 b , and the saturation quantity is a deviation or difference between a feedback value V_fb (Vd_fb, Vq_fb) and the voltage command Vd_cmd.

First claim

The invention claimed is:

1. A PWM power converter parallel running apparatus for synchronously operating a plurality of PWM power converters whose outputs are connected in parallel, the PWM power converter parallel running apparatus comprising:
a current control section to perform an integral calculation of a deviation between a current command value and a current detection value, and to output a voltage command;
a cross current compensating section to perform across current compensation to the voltage command in accordance with a deviation of output currents of the PWM power converters, and to output a voltage command of each PWM power converter;
a voltage command limiting section to impose output limitation on the voltage command of each PWM power converter; and
a feedback value calculating section to calculate an average of the voltage commands after the output limitation, as a feedback value;
the current control section being arranged to use, as the deviation used for the integral calculation, a sum obtained by addition, to the deviation between the current command value and the current detection value, of a product obtained by multiplying, by a feedback gain, a saturation quantity of an operation quantity limited by the voltage command limiting section which is a deviation between the feedback value and the voltage command.

2. The PWM power converter parallelrunning apparatus as recited in claim 1 , wherein a zero phase voltage is subtracted from the voltage command.

3. The PWM power converter parallelrunning apparatus as recited in claim 1 , wherein a dead time compensating value is added to the voltage command.

4. The PWM power converter parallelrunning apparatus as recited in claim 2 , wherein a dead time compensating value is added to the voltage command.

Assignees

• Meidensha Electric Mfg Co Ltd

Inventors

• Hamada Shizunori
• Takahashi Toshimichi

Classifications

• H02P27/085 Primary

  wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency · CPC title

• H02M7/493 Primary

  the static converters being arranged for operation in parallel · CPC title