Apparatus and method for controlling module switching of power converting system

Patent metadata

Field	Value
Publication number	US-9438098-B2
Application number	US-201214364494-A
Country	US
Kind code	B2
Filing date	Dec 12, 2012
Priority date	Dec 12, 2011
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A technology is disclosed for controlling switching of power converters included in a power converting system. Phase angles are allocated to a plurality of sub-units corresponding to the power converters, and the respective sub-units create local switching carriers based on the allocated phase angles. The sub-units compare a reference AC voltage with the local switching carriers, and switch the power converters according to the result of the comparison.

First claim

What is claimed is:

1. An apparatus for converting power comprising:
a central controller that generates a reference AC voltage;
a phase leg including a plurality of power converters; and
a plurality of sub-units,
wherein the central controller allocates respective different phase angles to the respective sub-units, and the respective sub-units individually create local switching carriers based on the allocated phase angles, and controls switching of the power converters corresponding to the respective sub-units according to a result of a comparison of the individually created local switching carriers and the reference AC voltage,
wherein the local switching carriers created by the respective sub-units are sinusoidal waves each having a same frequency and the respective different phase angle from each other allocated by the center controller, and
wherein, when the number of the power converters is M, a difference between any two of the allocated phase angles is a multiple of 2π/M.

2. The apparatus of claim 1 , wherein the power converters included in the phase leg are connected in series with each other.

3. The apparatus of claim 1 , wherein the phase leg is arranged between a DC connection terminal and an AC connection terminal.

4. The apparatus of claim 1 , wherein the respective sub-units control the switching of the power converters corresponding to the respective sub-unit when the local switching carriers intersect with the reference AC voltage.

5. The apparatus of claim 1 , wherein the power converters comprise a plurality of power electronic switches connected in series with each other, and a capacitor connected in parallel with the power electronic switches.

6. A method of converting power, comprising:
allocating different phase angles to a plurality of sub-units, respectively, by a central controller;
individually creating local switching carriers based on the allocated phase angles, by the respective sub-units; and
controlling switching of power converters included in a phase leg and corresponding to the respective sub-units according to a result of a comparison of the individually created local switching carriers and a reference AC voltage, by the respective sub-units,
wherein the local switching carriers created by the respective sub-units are sinusoidal waves each having a same frequency and the respective different phase angle from each other allocated by the center controller, and
wherein, when the number of the power converters is M, a difference between any two of the allocated phase angles is a multiple of 2π/M.

7. The method of claim 6 , wherein the power converters included in the phase leg are connected in series with each other.

8. A non-transitory computer readable recording medium in which a program for executing the method of claim 7 is recorded.

9. The method of claim 6 , wherein the phase leg is arranged between a DC connection terminal and an AC connection terminal.

10. A non-transitory computer readable recording medium in which a program for executing the method of claim 9 is recorded.

11. The method of claim 6 , wherein the controlling of the switching comprises:
controlling the switching of the power converters corresponding to the respective sub-unit when the local switching carriers intersect with the reference AC voltage.

12. A non-transitory computer readable recording medium in which a program for executing the method of claim 11 is recorded.

13. The method of claim 6 , wherein the power converters comprise a plurality of power electronic switches connected in series with each other, and a capacitor connected in parallel with the power electronic switches.

14. A non-transitory computer readable recording medium in which a program for executing the method of claim 13 is recorded.

15. A non-transitory computer readable recording medium in which a program for executing the method of claim 6 is recorded.

Assignees

• Hyosung Corp

Inventors

• Kim June-Sung
• Choi Jong-Yun

Classifications

• H02M1/081 Primary

  wherein the phase of the control voltage is adjustable with reference to the AC source · CPC title

• H02M1/082 Primary

  with digital control · CPC title

• H02M2001/007

  Electricity · mapped topic

• H02M1/088

  for the simultaneous control of series or parallel connected semiconductor devices · CPC title

• H02M1/0845

  digitally controlled (or with digital control) · CPC title