Matrix converter control using predicted output current

Patent metadata

Field	Value
Publication number	US-10958183-B2
Application number	US-201716466622-A
Country	US
Kind code	B2
Filing date	Oct 24, 2017
Priority date	Dec 5, 2016
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

There is provided a method of generating a control strategy based on at least three switching states of a matrix converter. The at least three switching states are selected based on at least a predicted output current, associated with each switching state, and a desired output current. In particular, mathematical transformations of a desired output current as well as output currents associated with each of a plurality of switching states are used to identify appropriate switching states.

First claim

The invention claimed is:

1. A method of generating a control strategy for a matrix convertor, the method comprising:
obtaining a target output transformation result representing a mathematical transformation result of a desired multi-phase output current of the matrix converter;
identifying a plurality of switching states of the matrix converter;
obtaining, for each switching state in the identified plurality of switching states, a predicted output transformation result representing a mathematical transformation result of a predicted output current for the switching state;
identifying from the plurality of switching states at least three switching states, wherein, when mapped using a Cartesian co-ordinate system, a position of the target output transformation result is contained by an area defined by the positions of the predicted output transformation results associated with the at least three switching states; and
generating the control strategy for the matrix converter based on the at least three switching states,
wherein the identifying the at least three switching states comprises:
obtaining, for each switching state in the identified plurality of switching state, a predicted output transformation result error representing a predicted error between the predicted output transformation result associated with the switching state and the target output transformation result; and
identifying the at least three switching states, wherein, when mapped using a Cartesian co-ordinate system, a position of the origin is contained by an area defined by the positions of the predicted output transformation result errors associated with the at least three switching states.

2. The method of claim 1 , wherein the obtaining, for each switching state in the identified plurality of switching states, the predicted output transformation result comprises:
obtaining, for each switching state, a predicted output transformation result from a simulated or mathematical model of the matrix converter and a load of the matrix converter.

3. The method of claim 1 , wherein the obtaining, for each switching state in the identified plurality of switching states, the predicted output transformation result comprises:
predicting, using a simulated or mathematical model of the matrix converter and a load of the matrix converter, an output current of the matrix converter associated with each switching state in the identified plurality of switching states; and
performing a mathematical transformation on the predicted output current associated with each switching state to thereby obtain a predicted output transformation result for each switching state in the identified plurality of switching states.

4. The method of claim 1 , wherein the identifying the at least three switching states comprises:
identifying a first switching state for which a voltage difference between all output terminals of the matrix converter operating according to the first switching state is substantially zero;
identifying a second switching state for which a voltage difference between at least two output terminals of the matrix converter operating according to the second switching state is non-zero; and
identifying a third switching state for which a voltage difference between at least two output terminals of the matrix converter operating according to the third switching state is non-zero.

5. The method of claim 1 , wherein generating the control strategy comprises:
calculating a duty cycle for the at least three switching states based on the target output transformation result; and
generating the control strategy for the matrix converter based on the calculated duty cycles.

6. The method of claim 1 , wherein the mathematical transformation is an alpha-beta transformation, such that the target output transformation result represents an alpha-beta transformation result of a desired multi-phase output current of the matrix converter and each predicted output transformation result represents an alpha-beta transformation result of a predicted output current for a respective switching state.

7. A method of generating a control strategy for a matrix convertor, the method comprising:
obtaining a target output transformation result representing a mathematical transformation result of a desired multi-phase output current of the matrix converter;
identifying a plurality of switching states of the matrix converter;
obtaining, for each switching state in the identified plurality of switching states, a predicted output transformation result representing a mathematical transformation result of a predicted output current for the switching state;
identifying from the plurality of switching states at least three switching states, wherein, when mapped using a Cartesian co-ordinate system, a position of the target output transformation result is contained by an area defined by the positions of the predicted output transformation results associated with the at least three switching states; and
generating the control strategy for the matrix converter based on the at least three switching states,
wherein the identifying the plurality of switching states comprises:
obtaining a target input transformation result representing a mathematical transformation result of a desired input current of the matrix converter;
obtaining, for each possible switching state of the matrix convertor, an input transformation result representing a mathematical transformation result of a current input of the matrix converter associated with the possible switching state;
identifying a plurality of input transformation results that are, when mapped using a Cartesian co-ordinate system, proximate to the position of the target input transformation result; and
identifying the plurality of switching states associated with the identified plurality of input transformation results.

8. A method of generating a control strategy for a matrix convertor, the method comprising:
obtaining a target output transformation result representing a mathematical transformation result of a desired multi-phase output current of the matrix converter;
identifying a plurality of switching states of the matrix converter;
obtaining, for each switching state in the identified plurality of switching states, a predicted output transformation result representing a mathematical transformation result of a predicted output current for the switching state;
identifying from the plurality of switching states at least three switching states, wherein, when mapped using a Cartesian co-ordinate system, a position of the target output transformation result is contained by an area defined by the positions of the predicted output transformation results associated with the at least three switching states; and
generating the control strategy for the matrix converter based on the at least three switching states,
wherein the identifying the plurality of switching states comprises:
obtaining, for each possible switching state of the matrix convertor, a second output transformation result representing a mathematical transformation result of a voltage output of the matrix converter associated with the possible switching state; and
identifying the at plurality of switching states based on a magnitude of the second output transformation results.

9. The method of claim 8 , wherein the identifying the plurality of switching states based on a magnitude of the second output transformation results comprises identifying the plurality of switching states associated with the second output transformation results of the largest magnitude.

10. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processor

Assignees

• Itt Mfg Enterprises Llc

Inventors

• Vijayagopal Manjusha
• Silva Jiménez César Armando
• Empringham Lee
• De Lillo Liliana Vittoria

Classifications

• H02M5/297 Primary

  for conversion of frequency · CPC title

• H02M5/293 Primary

  using semiconductor devices only · CPC title

• H02M7/53876

  based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times · CPC title

• H02M2007/53876

  Electricity · mapped topic