Power supply system and method for electronic converters

• US 10,256,634 B2
• Filed: 05/17/2013
• Issued: 04/09/2019
• Est. Priority Date: 05/17/2013
• Status: Active Grant

• Current Assignee: Ingeteam S.A.
• Original Assignee: Ingeteam S.A.
• Inventors: Balda Belzunegui, Julian, Gonzalez Senosiain, Roberto, Perez Nicuesa, Luis
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Vu, Toan
• Application Number:
  US14/891,503
• Publication Number:
  US 20160118797A1
• Time in Patent Office: 2,153 Days
• Field of Search: 307 26
• CPC Class Codes: H02J 2300/20 The dispersed energy generation being of renewable origin
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 9/062 for AC powered loads
• CPC Class Codes: H02J 9/068 Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
• CPC Class Codes: H02M 3/04 by static converters
• CPC Class Codes: H02M 7/44 by static converters
• CPC Class Codes: Y02B 10/70 Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

The object of the invention is to provide a power supply system and method for the various elements forming DC/AC electronic power converters that assures the operation of the converters during normal operating conditions and anomalous operating conditions, being specially designed for photovoltaic systems connected to the power grid and capable of providing direct current and alternating current voltages at the output thereof from at least one DC power source (1) and at least one AC power source (2), which basically comprises an output for DC loads (6) connected to the output of a DC/DC converter (3) the input of which is connected to the DC power source (1), an AC output for critical loads (7) connected to a first selector (5) configured for alternating between a first position where said AC output for critical loads (7) is connected to the output of a first DC/AC converter (4) the input of which is connected to the DC power source (1), and a second position where said AC output for critical loads (7) is connected to the AC power source (2), an AC output for non-critical loads (8) connected to the AC power source (2) and a control unit (9) controlling the operation of said first selector (5).

Claims

1. A power supply system for electronic converters capable of providing at their output direct current and alternating current voltages from at least one DC power source (1) and at least one AC power source (2), the DC power source being a photovoltaic generator and the power supply system comprising:

an output for DC loads (6) connected to an output of a DC/DC converter (3) an input of which is connected to the DC power source (1),

an AC output for critical loads (7) connected to a first selector (5) configured for alternating between a first position where said AC output for critical loads (7) is connected to and output of a first DC/AC converter (4) the input of which is connected to the DC power source (1), and a second position where said AC output for critical loads (7) is connected to the AC power source (2),

an AC output for non-critical loads (8) connected to the AC power source (2),

a control unit (9) controlling the operation of said first selector (5); and

a first AC/DC converter (10), an input of which is connected to the AC output for critical loads (7) and an output of which is connected to the output for DC loads (6).

2. The power supply system for electronic converters according to claim 1, wherein the control unit (9) is integrated in the first DC/AC converter (4), in the second DC/AC converter (15), in the DC/DC converter (3), or in the second AC/DC converter (12).

3. The power supply system for electronic converters according to claim 1, wherein the AC power source (2) is the power grid.

4. A method for operating the system according to claim 1, the method comprising:

in normal operating conditions, the control unit (9) keeps the first selector (5) in a first position corresponding to the power supply of the AC output for critical loads (7) from the DC power source (1) through the first DC/AC converter (4); and

in anomalous operating conditions, the control unit (9) operates the first selector (5) to go to a second position corresponding to the power supply of the AC output for critical loads (7) directly from the AC power source (2).

5. A power supply system for electronic converters capable of providing at their output direct current and alternating current voltages from at least one DC power source (1) and at least one AC power source (2), the DC power source being a photovoltaic generator and the power supply system comprising:

an output for DC loads (6) connected to an output of a DC/DC converter (3), an input of which is connected to a DC power source (1),

an AC output for critical loads (7) connected to a first selector (5) configured for alternating between a first position where said AC output for critical loads (7) is connected to an output of a first DC/AC converter (4), an input of which is connected to the DC power source (1), and a second position where said AC output for critical loads (7) is connected to the AC power source (2),

an AC output for non-critical loads (8) connected to the AC power source (2),

a control unit (9) controlling an operation of said first selector (5),

a DC output for critical loads (11) connected to a second selector (13) configured for alternating between a first position where said DC output for critical loads (11) is connected to the output of the DC/DC converter (3) the input of which is connected to the DC power source (1), and a second position where said DC output for critical loads (11) is connected to the output of a second AC/DC converter (12) the input of which is connected to the AC power source (2),

a DC output for non-critical loads (14) connected to the output of the second AC/DC converter (12),

where the control unit (9) further controls the operation of said second selector (13); and

a second DC/AC converter (15) the DC side of which is connected to the output of the DC/DC converter (3) and the AC side of which is connected to the AC output for critical loads (7).

6. A method for operating the system according to claim 5, comprising:

in normal operating conditions, the control unit (9) keeps the first selector (5) in the first position corresponding to the power supply of the AC output for critical loads (7) from the DC power source (1) through the first DC/AC converter (4), and the second selector (13) in the first position corresponding to the connection of the DC power source (1) with the DC output for critical loads (11) through the DC/DC converter (3); and

in anomalous operating conditions, the control unit (9) operates the first selector (5) to go to the second position corresponding to the power supply of the AC output for critical loads (7) directly from the AC power source (2), and the second selector (13) to go to a second position corresponding to the power supply of the DC output for critical loads (11) from the AC power source (2) through the second AC/DC converter (12).