MATRIX CONVERTER AND CONTROL METHOD THEREFOR

• US 20140254230A1
• Filed: 03/11/2014
• Published: 09/11/2014
• Est. Priority Date: 03/11/2013
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Yaskawa Denki
• Original Assignee: Kabushiki Kaisha Yaskawa Denki
• Inventors: MORIMOTO, Shinya, TAKASE, Yoshiyasu, INOMATA, Kentaro, TAKAKI, Mamoru
• Granted Patent: US 9,112,414 B2
• Time in Patent Office: Days
• US Class Current: 363/163
• CPC Class Codes: H02M 5/293 using semiconductor devices only
• CPC Class Codes: H02M 5/297 for conversion of frequency

Abstract

Provided is a matrix converter including a power converter, a commutation controller, and a compensator. The power converter includes a plurality of bidirectional switches. The commutation controller performs one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when an input terminal to be connected to an output terminal is switched by on/off control of the bidirectional switches. The compensator compensates for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on a potential difference before and after the switching of the input terminal to be connected to the output terminal, an output current of the output terminal, and capacitance between input and output terminals of unidirectional switches.

Claims

1. A matrix converter, comprising:

a power converter comprising a plurality of bidirectional switches disposed between, on a first end, a plurality of input terminals connected to phases of an AC power source and on a second end to a plurality of output terminals connected to phases of a load;

a commutation controller configured to perform one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when the input terminal to be connected to the output terminal is switched by on/off control of the bidirectional switches; and

a compensator configured to compensate for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on at least;

a potential difference before and after the switching of the input terminal to be connected to the output terminal,

an output current of the output terminal, and

capacitance between input and output terminals of unidirectional switches included in the bidirectional switches.

2. The matrix converter according to claim 1, wherein the plurality of bidirectional switches are each configured by an anti-parallel connection of series connections of the unidirectional switch and a diode.

3. The matrix converter according to claim 1, wherein the plurality of bidirectional switches are each configured by an anti-parallel connection of the unidirectional switches.

4. The matrix converter according to claim 1, wherein the compensator is configured to compensate for the output voltage error generated when the output current is positive and when the input terminal to be connected to the output terminal is switched from an input terminal connected to a high voltage phase to an input terminal connected to a low voltage phase, based on at least:

a potential difference between the high voltage phase and the low voltage phase,

the output current, and

the capacitance.

5. The matrix converter according to claim 1, wherein the compensator is configured to compensate for the output voltage error generated when the output current is negative and when the input terminal to be connected to the output terminal is switched from an input terminal connected to a low voltage phase to an input terminal connected to a high voltage phase, based on at least:

a potential difference between the high voltage phase

the low voltage phase,

the output current, and

the capacitance.

6. The matrix converter according to claim 1, wherein the compensator is configured to switch a method of calculating the output voltage error in accordance with whether or not a change of an output voltage of the output terminal due to the capacitance is completed in a step period in which the output voltage is changing due to the commutation operation.

7. The matrix converter according to claim 1, further comprising a calculator configured to perform one of measuring and adjusting of the capacitance,

wherein the compensator is configured to compensate for the output voltage error by using the capacitance calculated by the calculator.

10. The matrix converter according to claim 1, wherein said plurality of bidirectional switches consists of nine bidirectional switches.

11. The matrix converter according to claim 1, wherein said plurality of bidirectional switches comprises:

a first bidirectional switch, a second bidirectional switch, and a third bidirectional switch.

12. The matrix converter according to claim 11, wherein said plurality of bidirectional switches comprises:

a fourth bidirectional switch, a fifth bidirectional switch and a sixth bidirectional switch.

13. The matrix converter according to claim 12, wherein said plurality of bidirectional switches comprises:

a seventh bidirectional switch, an eighth bidirectional switch and a ninth bidirectional switch.

8. A matrix converter, comprising:

power converting means comprising a plurality of bidirectional switches disposed between, on a first end, a plurality of input terminals connected to phases of an AC power source and on a second end a plurality of output terminals connected to phases of a load;

commutation controlling means configured to perform one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when the input terminal to be connected to the output terminal is switched by on/off control of the bidirectional switches; and

compensating means configured to compensate for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on at least;

a potential difference before and after the switching of the input terminal to be connected to the output terminal,

an output current of the output terminal, and

capacitance between input and output terminals of unidirectional switches included in the bidirectional switches.

9. A method of controlling a matrix converter,

the matrix converter comprising power converting means comprising a plurality of bidirectional switches disposed between, on a first end, a plurality of input terminals connected to phases of an AC power source and, on a second end, a plurality of output terminals connected to phases of a load,

the method comprising:

performing one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when the input terminal to be connected to the output terminal is switched by on/off control of the bidirectional switches; and

compensating for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on at least;

a potential difference before and after the switching of the input terminal to be connected to the output terminal,

an output current of the output terminal, and

capacitance between input and output terminals of unidirectional switches included in the bidirectional switches.