# US 2024/0204518 A1 · Redundant power supply, in particular for data centers, and method and computer program for the operation thereof

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- Number: US 2024/0204518 A1
- Document ID: US20240204518A1
- Status: Published application
- Kind: A1
- Application number: 17/910,748
- Filed: 2022-04-27
- Published: 2024-06-20
- Earliest claimed: 2021-05-03
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Yi Zhu; Shivansh Batra; Thomas Beckert; David Meulenbroeks
- Web page: https://patentgrep.com/patent/US20240204518A1

## CPC

- H02J 3/0012: characterised by the contingency detection means in AC networks, e.g. using phasor measurement units [PMU], synchrophasors or contingency analysis
- H02H 1/04: Arrangements for preventing response to transient abnormal conditions, e.g. to lightning {or to short duration over voltage or oscillations; Damping the influence of DC component by short circuits in AC networks}
- H02H 3/08: responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04)
- H02J 3/0073: by providing alternative feeding paths when the main path fails
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)

## Abstract

A redundant power supply has a first power supply, which is disconnectedly connected to a busbar by means of a first tie switch and is connectable to a first load without a tie switch, and having a second power supply, which is disconnectedly connected to the busbar by means of a second tie switch and is connectable to the first load without a tie switch, and having a third power supply, which is disconnectedly connected to the busbar by means of a third tie switch and is connectable to a second load without a tie switch, and having a fourth power supply, which is disconnectedly connected to the busbar by means of a fourth tie switch and is connectable to the second load without a tie switch. All of the tie switches are closed during trouble-free operation.

## Claims

### Claim 1

A redundant power supply comprising:
a first power supply, which is disconnectably connected to a busbar by means of a first tie switch is connectable to a first load without a tie switch;
a second power supply, which is disconnectably connected to the busbar by means of a second tie switch and is connectable to the first load without a tie switch;
a third power supply, which is disconnectably connected to the busbar by means of a third tie switch and is connectable to a second load without a tie switch; and
a fourth power supply, which is disconnectably connected to the busbar by means of a fourth tie switch and is connectable to the second load without a tie switch;
wherein all of the tie switches are closed during trouble-free operation.

### Claim 2 (depends on 1)

The redundant power supply as claimed in claim 1, comprising a controller that controls the tie switches in such a way that all of the tie switches are opened when a busbar disturbance is detected.

### Claim 3 (depends on 1)

The redundant power supply as claimed in claim 1, comprising a controller that, in an event of a disturbance on the line between one of the power supplies and the tie switch connected to this power supply or in the event of a disturbance on the line between one of the power supplies and the load connected to this power supply without a tie switch, opens the tie switch connected to this power supply.

### Claim 4 (depends on 2)

The redundant power supply as claimed in claim 2, wherein:
the tie switches comprise means for determining the current flowing through the respective tie switch and/or the arithmetic sign of the current flowing through the respective tie switch and means for transferring a current value and/or an arithmetic sign value to the controller;
the controller comprises means for receiving the current values and/or arithmetic sign values from all of the tie switches; and
the controller comprises means for identifying a busbar disturbance if the sum of the current values received from all of the tie switches is greater than a definable threshold value and/or arithmetic sign values that indicate a flow of current from the respective power supply to the busbar are received from all of the tie switches.

### Claim 5 (depends on 3)

The redundant power supply as claimed in claim 3, wherein:
the tie switches comprise means for determining the current flowing through the respective tie switch and/or the arithmetic sign of the current flowing through the respective tie switch and means for transferring a current value and/or an arithmetic sign value to the controller;
the power supplies comprise means for generating a signal that indicates whether the respective power supply is active, and means for transmitting this signal to the controller;
the controller comprises means for receiving the current values and/or arithmetic sign values from all of the tie switches and means for receiving the signals from all of the power supplies; and
the controller comprises means for identifying a disturbance on the line between one of the power supplies and the tie switch connected to the power supply or a disturbance on the line between one of the power supplies and the load connected to the power supply without a tie switch in response to signals being received from all of the power supplies indicating that the respective power supply is active and that the current value at one of the tie switches corresponds to the negative value of the sum of the current values of all of the other tie switches and/or the arithmetic sign value at one of the tie switches corresponds to the negative value of the arithmetic sign values of all of the other tie switches.

### Claim 6 (depends on 1)

A method for operating a redundant power supply as claimed in claim 1, comprising:
for each tie switch, determining the current flowing through the respective tie switch and/or the arithmetic sign of the current flowing through the respective tie switch; and
identifying a busbar disturbance if the sum of the current values received from all of the tie switches is greater than a definable threshold value and/or arithmetic sign values that indicate a flow of current from the respective power supply to the busbar are received from all of the tie switches.

### Claim 7 (depends on 6)

The method as claimed in claim 6, further comprising:
for each power supply, generating a signal that indicates whether the respective power supply is active;
identifying a disturbance on the line between one of the power supplies and the tie switch connected to the power supply or a disturbance on the line between one of the power supplies and the load connected to the power supply without a tie switch in response to signals being received from all of the power supplies indicating that the respective power supply is active and that the current value at one of the tie switches corresponds to the negative value of the sum of the current values of all of the other tie switches and/or that the arithmetic sign value at one of the tie switches corresponds to the negative value of the arithmetic sign values of all of the other tie switches.

### Claim 8 (depends on 6)

The method as claimed in claim 6, additionally comprising the following steps:
opening all of the tie switches in response to the identification of a busbar disturbance; and/or
opening the tie switch whose current value corresponds to the negative value of the sum of the current values and/or the arithmetic sign value of which corresponds to the negative value of the arithmetic sign values of all of the other tie switches in response to the identification of a disturbance on the line between one of the power supplies and the tie switch connected to the power supply or of a disturbance on the line between one of the power supplies and the load connected to the power supply without a tie switch.

### Claim 9 (depends on 6)

A computer program comprising machine-readable instructions for implementing the method as claimed in claim 6.

### Claim 10 (depends on 6)

A computer program product comprising a computer readable hardware storage device having computer readable program code stored therein, said program code executable by a processor of a computer system to implement the method of claim 6.