Single-stage three-phase power supply conversion device and power line transmission device

• US 10,389,267 B2
• Filed: 08/03/2018
• Issued: 08/20/2019
• Est. Priority Date: 02/06/2016
• Status: Active Grant

• Current Assignee: Weilun Chen
• Original Assignee: Weilun Chen
• Inventors: Chen, Weilun, Chen, Steve Jun
• Primary Examiner(s): Patel, Rajnikant B
• Application Number:
  US16/054,876
• Publication Number:
  US 20180342962A1
• Time in Patent Office: 382 Days
• Field of Search: 363 16- 20, 363 2102, 363 37- 41, 363 65, 363 71, 363125, 363127, 363144, 363142
• CPC Class Codes: H02J 3/36 Arrangements for transfer of electric power between ac networks via a high-tension dc link
• CPC Class Codes: H02M 5/4585 having a rectifier with controlled elements
• CPC Class Codes: H02M 7/217 using semiconductor devices only
• CPC Class Codes: H02M 7/2173 in a biphase or polyphase circuit arrangement H02M7/2176 takes precedence; voltage multipliers H02M7/25
• CPC Class Codes: H02M 7/219 in a bridge configuration
• CPC Class Codes: H02M 7/48 using discharge tubes with control electrode or semiconductor devices with control electrode
• CPC Class Codes: Y02E 60/60 Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

A single-stage three-phase power supply conversion device includes a three-phase rectification and commutation module and a DC/DC conversion module; the three-phase rectification and commutation module has a three-phase AC connection end, a DC source first connection end, a DC source second connection end and a DC source third connection end, and the DC/DC conversion module has a first connection end, a second connection end, a third connection end, a DC source positive connection end and a DC source negative connection end; a three-phase AC source is connected to the three-phase AC connection end of the three-phase rectification and commutation module, the DC source first connection end of the three-phase rectification and commutation module is connected to the first connection end of the DC/DC conversion module, the DC source second connection end is connected to the second connection end of the DC/DC conversion module.

Claims

1. A single-stage three-phase power supply conversion device for achieving AC/DC or DC/AC conversion between a three-phase AC source and a DC source, comprising:

a three-phase rectification and commutation module and a DC/DC conversion module;

wherein, the three-phase rectification and commutation module has a three-phase AC connection end, a DC source first connection end, a DC source second connection end and a DC source third connection end, and the DC/DC conversion module has a first connection end, a second connection end, a third connection end, a DC source positive connection end and a DC source negative connection end;

the three-phase AC source is connected to the three-phase AC connection end of the three-phase rectification and commutation module, the DC source first connection end of the three-phase rectification and commutation module is connected to the first connection end of the DC/DC conversion module, the DC source second connection end is connected to the second connection end of the DC/DC conversion module, the DC source third connection end is connected to the third connection end of the DC/DC conversion module, a positive end of the DC source is connected to the DC source positive connection end of the DC/DC conversion module, and a negative end of the DC source is connected to the DC source negative connection end of the DC/DC conversion module;

wherein, the three-phase rectification and commutation module includes;

a three-phase rectification unit and a three-phase commutation unit;

the three-phase rectification unit and the three-phase commutation unit are connected to the three-phase AC connection end of the three-phase rectification and commutation module through respective three connection terminals and hence connected with the three phases of the three-phase AC source respectively;

the three-phase rectification unit is connected to the first connection end of the DC/DC conversion module through the DC source first connection end, and is connected to the second connection end of the DC/DC conversion module through the DC source second connection end;

the three-phase commutation unit is connected to the third connection end of the DC/DC conversion module through the DC source third connection end;

wherein, the DC/DC conversion module includes;

a first DC/DC conversion unit, a second DC/DC conversion unit and a third DC/DC conversion unit;

the first, second and third DC/DC conversion units each has a positive input end, a negative input end, a positive output end and a negative output end, respectively;

the positive input end of the first DC/DC conversion unit and the positive input end of the third DC/DC conversion unit are both connected to the first connection end of the DC/DC conversion module;

the negative input end of the second DC/DC conversion unit and the negative input end of the third DC/DC conversion unit are connected to the second connection end of the DC/DC conversion module;

the negative input end of the first DC/DC conversion unit and the positive input end of the second DC/DC conversion unit are connected to the third connection end of the DC/DC conversion module, the positive output ends of the first, second and third DC/DC comers are all connected to the positive end of the DC source, and the negative output ends of the first, second and third DC/DC conversion units are all connected to the negative end of the DC source.

2. The single-stage three-phase power supply conversion device according, to claim 1, wherein, the three-phase AC connection end of the three-phase rectification and commutation module has three connection terminals which are respectively connected to three phases of the three-phase AC source.

3. The single-stage three-phase power supply conversion device according to claim 1, wherein, when DC/DC conversion is performed, the three-phase rectification and commutation module is used for converting three-phase alternating current input by the three-phase AC source into a first DC source and a second DC source and the DC/DC conversion module performs power conversion on the first DC source and the second DC source into direct current to be output to the DC source.

4. The single-stage three-phase power supply conversion device according to claim 1, wherein, the three-phase rectification unit is used for converting three-phase alternating current into the first DC source;

and the three-phase commutation unit is used for converting three-phase alternating current into the second DC source.

5. The single-stage three-phase power supply conversion device according to claim 1, wherein, when DC/AC conversion is performed, the DC/DC conversion module converts the DC source into a first DC source and a second DC source, and the three-phase rectification and commutation module converts the first DC source and the second DC source into three-phase alternating current to be output to the three-phase AC source.

6. The single-stage three-phase power supply conversion device according to claim 1, wherein, the three-phase rectification unit is used for converting the first DC source into three-phase alternating current;

and the three-phase commutation unit is used for converting the second DC source into three-phase alternating current.

7. A power line transmission device for transmitting electric power from a first three-phase AC power grid to a second three-phase AC power grid, comprising:

two three-phase rectification and commutation modules;

wherein, the two three-phase rectification and commutation modules each has a three-phase AC connection end a DC source first connection end, a DC source second connection end and a DC source third connection end, respectively;

the three phase AC connection end of one three-phase rectification and commutation module is connected to the first three-phase AC power grid, the DC source first connection end of the three-phase rectification and commutation module is connected to the DC source first connection end of the other three-phase rectification and commutation module the DC source second connection end is connected to the DC source second connection end of the other three-phase rectification and commutation module, the DC source third connection end is connected to the DC source third connection end of the other three-phase rectification and commutation module, and the three-phase AC connection end of the other three-phase rectification and commutation module is connected to the second three-phase AC power grid;

wherein, the three-phase rectification and commutation module includes;

a three-phase rectification unit and a three-phase commutation unit;

the three-phase rectification unit and the three-phase commutation unit are connected to three phases of a three-phase AC power grid through respective three connection terminals;

the three-phase rectification unit is connected to the DC source first connection end and the DC source second connection end of the other three-phase rectification and commutation module through the DC source first connection end and the DC source second connection end;

the three-phase commutation unit is connected to the DC source third connection end of the other three-phase rectification and commutation module through the DC source third connection end.

8. The power line transmission device according to claim 7, wherein, the three-phase AC connection ends of the two three-phase rectification and commutation modules each has three connection terminals which are respectively connected to three phases of the first three-phase grid and the second three-phase AC power grid.