System and method for controlling bidirectional three-phase DC/DC converter

• US 7,259,542 B2
• Filed: 12/12/2005
• Issued: 08/21/2007
• Est. Priority Date: 12/23/2004
• Status: Expired due to Fees

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Song, Hong-Seok
• Primary Examiner(s): STERRETT, JEFFREY L
• Application Number:
  US11/302,068
• Publication Number:
  US 20060139979A1
• Time in Patent Office: 617 Days
• Field of Search: 323/282, 323/283, 323/351, 363/17, 363/78, 363/124
• US Class Current: 323/282
• CPC Class Codes: H02J 2300/30 The power source being a fuel cell
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel

Abstract

Disclosed are an apparatus and method for controlling a Direct Current (DC)/DC converter which controls energy flow between a first DC source and a second DC source to eliminate a high-frequency resonance. The apparatus for controlling the DC/DC converter includes a voltage controller, one or more subtractors, one or more fundamental component current controllers, a first coordinate transformer, a resonance current component extractor, a resonance frequency tracker, one or more resonance component current controllers, a second coordinate transformer, one or more adders and a Pulse Width Modulation (PWM) signal generation unit. The method implemented by the apparatus can effectively control any high-frequency resonance current components generated in the DC/DC converter.

Claims

1. An apparatus for controlling a Direct Current (DC)/DC converter which controls energy flow between a first DC source and a second DC source, comprising:

a voltage controller for generating a current command value for an input current of the second DC source;

one or more subtractors for generating differences between the current command value and measured currents of respective phases of the DC/DC converter;

one or more fundamental component current controllers for generating fundamental component control voltage command values of the respective phases of the DC/DC converter;

a first coordinate transformer for transforming the generated differences into values in an orthogonal stationary coordinate system;

a resonance current component extractor for extracting resonance current components from the transformed values in the orthogonal stationary coordinate system;

a resonance frequency tracker for estimating resonance frequency variation from the extracted resonance current components and feeding the estimated resonance frequency variation back to the resonance current component extractor;

one or more resonance component current controllers for generating voltage command values in the orthogonal stationary coordinate system;

a second coordinate transformer for generating resonance component control voltage command values for the respective phases of the DC/DC converter using the voltage command values in the orthogonal stationary coordinate system;

one or more adders for generating final voltage command values by adding each of the fundamental component control voltage command values of the respective phases to each of the corresponding resonance component control voltage command values; and

a Pulse Width Modulation (PWM) signal generation unit for generating a PWM signal for controlling the DC/DC converter based on the final voltage command values.

2. The apparatus of claim 1, wherein the current command value for the input current of the second DC source is used for offsetting a difference between a voltage command value for an output voltage of the first DC source and a measured output voltage of the first DC source.

3. The apparatus of claim 1, wherein the fundamental component control voltage command values are used for offsetting the differences between the current command values and measured currents of the respective phases of the DC/DC converter.

4. The apparatus of claim 1, wherein the voltage command values in the orthogonal stationary coordinate system are used for offsetting the extracted resonance current components.

5. The apparatus of claim 1, wherein the voltage command values in the orthogonal stationary coordinate system are inversely transformed into the resonance component control voltage command values in coordinate systems corresponding to the respective phases of the DC/DC converter.

6. A method of controlling a DC/DC converter which controls energy flow between a first DC source and a second DC source, comprising:

generating a current command value for an input current of the second DC source;

generating differences between the current command value and measured currents of respective phases of the DC/DC converter;

generating fundamental component control voltage command values of the respective phases of the DC/DC converter;

transforming the differences between the current command value and measured currents of respective phases of the DC/DC converter into values in an orthogonal stationary coordinate system;

extracting resonance current components from the transformed values in the orthogonal stationary coordinate system using a resonance current component extractor;

estimating resonance frequency variation from the extracted resonance current components and feeding the estimated resonance frequency variation back to the resonance current component extractor;

generating voltage command values in the orthogonal stationary coordinate system;

generating resonance component control voltage command values for the respective phases of the DC/DC converter using the voltage command values in the orthogonal stationary coordinate system;

generating final voltage command values by adding the fundamental component control voltage command values of the respective phases to the respective resonance component control voltage command values; and

applying a PWM signal to the DC/DC converter, the PWM signal being based on the final voltage command values.

7. The method of claim 6, wherein the current command value for the input current of the second DC source is used for offsetting a difference between a voltage command value for an output voltage of the first DC source and a measured output voltage of the first DC source.

8. The method of claim 6, wherein the fundamental component control voltage command values of the respective phases of the DC/DC converter are used for offsetting the differences between the current command values and currents of the respective phases.

9. The method of claim 6, wherein the voltage command values in the orthogonal stationary coordinate system are used for offsetting the extracted resonance current components.

10. The method of claim 6, wherein the voltage command values in the orthogonal stationary coordinate system are inversely transformed into the resonance component control voltage command values in coordinate systems corresponding to the respective phases of the DC/DC converter.

11. An apparatus for controlling a Direct Current (DC)/DC converter which controls energy flow between a first DC source and a second DC source, comprising:

means for generating a current command value for an input current of the second DC source;

means for generating differences between the current command value and measured currents of respective phases of the DC/DC converter;

means for generating fundamental component control voltage command values of the respective phases of the DC/DC converter;

means for transforming the generated differences into values in an orthogonal stationary coordinate system;

means for extracting resonance current components from the transformed values in the orthogonal stationary coordinate system;

means for estimating resonance frequency variation from the extracted resonance current components and feeding the estimated resonance frequency variation back to the means for extracting resonance current components;

means for generating voltage command values in the orthogonal stationary coordinate system;

means for generating resonance component control voltage command values for the respective phases of the DC/DC converter using the voltage command values in the orthogonal stationary coordinate system;

means for generating final voltage command values by adding each of the fundamental component control voltage command values of the respective phases to each of the corresponding resonance component control voltage command values; and

means for generating a PWM signal for controlling the DC/DC converter based on the final voltage command values.

12. The apparatus of claim 11, wherein the current command value for the input current of the second DC source is used for offsetting a difference between a voltage command value for an output voltage of the first DC source and a measured output voltage of the first DC source.

13. The apparatus of claim 11, wherein the fundamental component control voltage command values are used for offsetting the differences between the current command values and measured currents of the respective phases of the DC/DC converter.

14. The apparatus of claim 11, wherein the voltage command values in the orthogonal stationary coordinate system are used for offsetting the extracted resonance current components.

15. The apparatus of claim 11, wherein the voltage command values in the orthogonal stationary coordinate system are inversely transformed into the resonance component control voltage command values in coordinate systems corresponding to the respective phases of the DC/DC converter.