POWER SUPPLY SYSTEM AND METHOD FOR ELECTRONIC CONVERTERS

• US 20160118797A1
• Filed: 05/17/2013
• Published: 04/28/2016
• Est. Priority Date: 05/17/2013
• Status: Active Grant

• Current Assignee: Ingeteam S.A.
• Original Assignee: Ingeteam S.A.
• Inventors: BALDA BELZUNEGUI, Julin, GONZLEZ SENOSIIN, Roberto, PREZ NICUESA, Luis
• Granted Patent: US 10,256,634 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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. 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), characterized in that it 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).

2. Power supply system for electronic converters according to claim 1, further comprising a first AC/DC converter (10) the input of which is connected to the AC output for critical loads (7) and the output of which is connected to the output for DC loads (6).

3. Power supply system for electronic converters according to claim 1, further comprising

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), and

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

4. Power supply system for electronic converters according to claim 3, further comprising 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).

5. 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).

6. Power supply system for electronic converters claim 1, wherein the DC power source (1) is a photovoltaic generator or a storage system.

7. Power supply system for electronic converters according to claim 6, where the storage system is selected from batteries, ultracapacitors, and fuel cells.

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

9. Method according to claim 1, characterized in that it comprises the following steps:

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).

10. Method according to claim 3, characterized in that it comprises the following steps:

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 the second selector (13) in a 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 a 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).