Operating a load zone on a power grid

Patent metadata

Field	Value
Publication number	US-12021373-B2
Application number	US-201917424930-A
Country	US
Kind code	B2
Filing date	May 7, 2019
Priority date	Jan 24, 2019
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A method and switch module are for operating a load zone on a power grid. In an embodiment of the method, at least one load profile is captured and stored during setup operation of the load zone, documenting a temporal progression of a load zone current or voltage in a time window after closing of the current path. Based on the at least one load profile, a tolerance range for the temporal progression of at least one operating parameter of the load zone in the time window is defined. During normal operation of the load zone, the temporal progression of the at least one operating parameter in the time window after closing the current path is monitored and the load zone is disconnected from the power grid upon the temporal progression of an operating parameter in the time window, after closing the current path, being outside the tolerance range.

First claim

The invention claimed is:

1. A method for operating a load zone on a power grid, comprising:
defining a time window;
capturing and saving, in a set-up operation of the load zone, at least one load profile, the at least one load profile documenting a temporal characteristic of at least one of
a load zone current flowing in a current path connecting the load zone to the power grid, and
a load zone voltage between an electrical potential of the current path and a reference potential in the time window, further to closing of the current path;

defining, based upon the at least one load profile, a tolerance range for the temporal characteristic of at least one operating parameter of the load zone within the time window;
monitoring, during normal operation of the load zone, the temporal characteristic of the at least one operating parameter in the time window, further to the closing of the current path; and
opening the current path upon the monitoring, in the time window further to the closing of the current path, indicating the temporal characteristic of an operating parameter lies outside a tolerance range or departs from the tolerance range.

2. The method of claim 1 , wherein a current strength of the load zone current is employed as an operating parameter of the at least one operating parameters.

3. The method of claim 2 , wherein a first derivative of the current strength, of the load zone current after the time, is employed as an operating parameter of the at least one operating parameters.

4. The method of claim 2 , wherein the time window is shorter than 100 μs.

5. The method of claim 2 , wherein the current path is opened during the opening, and closed, via an electronic switch unit.

6. The method of claim 5 , wherein at least one tolerance range is defined, in the defining of the tolerance range, as compatible with a safe operating area of the electronic switch unit.

7. The method of claim 6 , wherein a temperature of the electronic switch unit is captured, and wherein at least one tolerance range is defined, in the defining of the tolerance range, in accordance with the temperature of the electronic switch unit.

8. The method of claim 5 , wherein a temperature of the electronic switch unit is captured, and wherein at least one tolerance range is defined, in the defining of the tolerance range, in accordance with the temperature of the electronic switch unit.

9. The method of claim 1 , wherein a magnitude of the load zone voltage is employed as an operating parameter of the at least one operating parameters.

10. The method of claim 9 , wherein a first derivative of the magnitude, of the load zone voltage after the time, is employed as an operating parameter of the at least one operating parameters.

11. The method of claim 1 , wherein the time window is shorter than 100 μs.

12. The method of claim 1 , wherein the current path is opened during the opening, and closed, via an electronic switch unit.

13. The method of claim 12 , wherein at least one tolerance range is defined, in the defining of the tolerance range, as compatible with a safe operating area of the electronic switch unit.

14. The method of claim 13 , wherein a temperature of the electronic switch unit is captured, and wherein at least one tolerance range is defined, in the defining of the tolerance range, in accordance with the temperature of the electronic switch unit.

15. The method of claim 12 , wherein a temperature of the electronic switch unit is captured, and wherein at least one tolerance range is defined, in the defining of the tolerance range, in accordance with the temperature of the electronic switch unit.

16. A switch module for operating a load zone on a power grid, the switch module comprising:
an actuatable electronic switch unit designed to open and close a current path between the load zone and the power grid;
a measuring unit designed to, in a time window further to closing of the current path, capture at least one of a temporal characteristic of a load zone current flowing in the current path and a temporal characteristic of a load zone voltage between an electrical potential of the current path and a reference potential;
a storage unit designed to save at least one load profile, captured by the measuring unit, documenting a temporal characteristic of the load zone current or the load zone voltage in the time window further to the closing of the current path, in a set-up operation of the load zone;
an evaluation unit designed, based upon the at least one load profile, to define a tolerance range for the temporal characteristic of at least one operating parameter of the load zone within the time window; and
a control unit, actuatable via the switch unit, designed to, in normal operation of the load zone, monitor the temporal characteristic of each operating parameter of the at least one operating parameter for which a tolerance range is defined, and to open the current path by actuation of the switch unit upon the temporal characteristic of an operating parameter, in the time window further to the closing of the current path, lying outside the tolerance range or departing from the tolerance range.

17. The switch module of claim 16 , wherein the evaluation unit is designed to define at least one tolerance range, compatible with a safe operating area of the electronic switch unit.

18. The switch module of claim 17 , further comprising:
a temperature sensor designed to capture a temperature of the electronic switch unit, wherein the evaluation unit is designed to define at least one tolerance range, in accordance with the temperature of the electronic switch unit.

19. A power grid comprising the switch module of claim 11 .

20. The switch module of claim 16 , further comprising:
a temperature sensor designed to capture a temperature of the electronic switch unit, wherein the evaluation unit is designed to define the at least one tolerance range, in accordance with the temperature of the electronic switch unit.

21. A power grid comprising the switch module of claim 10 .

22. The power grid of claim 21 , wherein the power grid is a DC power grid.

23. A switch module for operating a load zone on a power grid, the switch module comprising:
an actuatable electronic switch designed to open and close a current path between the load zone and the power grid;
a sensor designed to, in a time window further to closing of the current path, capture at least one of a temporal characteristic of a load zone current flowing in the current path and a temporal characteristic of a load zone voltage between an electrical potential of the current path and a reference potential;
a memory storage designed to save at least one load profile, captured by the sensor, documenting a temporal characteristic of the load zone current or the load zone voltage in the time window further to the closing of the current path, in a set-up operation of the load zone; and
at least one processor designed, based upon the at least one load profile, to define a tolerance range for the temporal characteristic of at least one operating parameter of the load zone within the time window; and
a controller, actuatable via the switch, designed to, in normal operation of the load zone, monitor the temporal characteristic of each operating parameter of the at least one operating parameter for which a tolerance range is defined, and to open the current path by actuation of the switch upon the temporal characteristic of a

Assignees

• Siemens Ag

Inventors

• Pfeifer Markus

Classifications

• H02J13/36

  specially adapted for protection systems · CPC title

• G05B2219/2639

  Energy management, use maximum of cheap power, keep peak load low · CPC title

• G05B19/042

  using digital processors (G05B19/05 takes precedence) · CPC title

• Y04S20/00

  Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof · CPC title

• Y02B90/20

  Smart grids as enabling technology in buildings sector (smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00) · CPC title