US 10,797,515 B2Granted

Method for controlling an uninterruptible power supply and system for an uninterruptible power supply

AssigneeMaschinenfabrik Reinhausen GmbH

InventorsAndrey Gavrilov, Manfried Kruska, Alexander Reich

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Abstract

A method controls an UPS with a system having: first and second terminals, a switch having: first and second switch terminals respectively connected to the first and second terminals; first and second thyristors connected between the first and second switch terminals in anti-parallel; and an inverter connected to the second terminal and the energy store. Switch current and a first potential at the first terminal are detected. In a first fault, where the first potential drops past a first rule and the switch current rises above a second rule: a second potential at the second switch terminal is set using the inverter so the switch current becomes zero. Then the switch current is compared with a second threshold, and if it is exceeded, a first check result is positive, otherwise it's negative. When positive, the second potential is reversed.

Claims15

Dependent claims

A method of controlling an uninterrupted power supply with a system, wherein the system comprises:

a first connection terminal, which is connectable to an alternating current source;
a second connection terminal, which is connectable to an alternating current load;
a switch comprising:
a first switch terminal connected to the first connection terminal;
a second switch terminal connected to the second connection terminal;
a first thyristor connected between the first switch terminal and the second switch terminal;
and
a second thyristor connected between the first switch terminal and the second switch terminal in anti-parallel to the first thyristor;
an energy store;
and
an inverter connected to the second connection terminal and the energy store, and
wherein:
a switch current flowing through the switch is detected;
a first potential present at the first connection terminal is detected;
and
in a first fault case, in which an amount of the first potential drops so that an instantaneous value of the first potential infringes a first predetermined permissibility rule and an amount of the switch current rises so that an instantaneous value of the switch current infringes a second predetermined permissibility rule:
a second potential present at the second switch terminal is set using the inverter such that the switch current is driven to zero;
and
after setting the second potential, the switch current is checked in that:
the amount of the switch current is detected up to a predetermined first checking time after the setting of the second potential and is compared with a predetermined threshold value, and if this second threshold value is exceeded, a first check result is evaluated as positive, and otherwise as negative;
in the case of the positive first check result, the second potential is reversed;
in the case of the negative first check result, the switch current is detected at a predetermined second checking time at or after the first checking time and is compared with zero, and if there is a departure from zero, a second check result is evaluated as positive, and otherwise as negative;
and
in the case of the positive second check result, the second potential is reversed.

21 more elements

A system for uninterrupted power supply, the system comprising:

a first connection terminal which is connectable to an alternating current source;
a second connection terminal which is connectable to an alternating current load;
a switch comprising:
a first switch terminal connected to the first connection terminal;
a second switch terminal connected to the second connection terminal;
first thyristor connected between the first switch terminal and the second switch terminal;
and
a second thyristor connected between the first switch terminal and the second switch terminal in anti-parallel to the first thyristor;
an energy store;
an inverter connected to the second connection terminal and the energy store;
a current sensor configured to detect a switch current flowing through the switch;
a first voltage sensor configured to detect a first potential present at the first connection terminal;
and
a control device coupled to the switch, the inverter, the current sensor, and the first voltage sensor;
wherein the control device is configured to:
evaluate the switch current and the first potential;
and
recognise a first fault case, in which an amount of the first potential drops so that an instantaneous value of the first potential infringes a first predetermined permissibility rule and an amount of the switch current rises so that an instantaneous value of the switch current infringes a second predetermined permissibility rule, and the control device is configured such that in the first fault case:
the control device controls the inverter such that the inverter generates a second potential which is present at the second switch terminal and drives the switch current to zero;
and
the control device, after setting the second potential, checks the switch current by comparing the amount of the switch current up to a predetermined first checking time after the setting of the second potential with a predetermined threshold value, and if the predetermined threshold value is exceeded, the control device evaluates a first check result as positive, and otherwise as negative;
in the case of the positive first check result, the control device reverses the second potential;
in the case of the negative first check result, the control device compares the switch current at a predetermined second checking time at or after the first checking time with zero, and if there is departure from zero, the control device evaluates a second check result as positive and otherwise as negative;
and
in the case of the positive second check result, the control device reverses the second potential.

22 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/328,729Filed 25 Aug 2017
Priority: EP 161868721 Sep 2016
Published: US 2019/0199127 A127 Jun 2019
Granted: 6 Oct 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02J 9/062
With automatic change-over , e.g. UPS systems: for AC powered loads
H03K 17/79
Using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled: controlling bipolar semiconductor…
H10D 18/60
Thyristors: gate-turn-off devices
H02J 9/068
With automatic change-over , e.g. UPS systems: electronic means for switching from one power supply to another power supply, e.g. to avoid…