METHOD FOR CONTROLLING A POWER GRID AND GRID CONTROL ARRANGEMENT

Abstract

A method for controlling a power grid includes using a communication device to receive first data messages with first phasor measurement data from a first phasor measurement unit. A reference device is used to determine a deviation between the first phasor measurement data and reference data. The first phasor measurement data are recognized as plausible when the deviation lies below a previously defined upper threshold value and/or above a previously defined lower threshold value. A corresponding grid control arrangement is also provided.

Claims

1. A method for controlling a power grid, the method comprising: using a communication device to receive first data messages with first phasor measurement data from a first phasor measurement unit; using a reference device to determine a deviation between the first phasor measurement data and reference data; and recognizing the first phasor measurement data as plausible when the deviation lies at least one of below a previously defined upper threshold value or above a previously defined lower threshold value.

2. The method according to claim 1, which further comprises using a supervisory device to take the first phasor measurement data recognized as plausible into account for recognition of a critical system state and determining countermeasures.

3. The method according to claim 2, which further comprises: using the supervisory device to define at least one of control commands for protective devices or controllable operating equipment based on the countermeasures; and using the communication device to transmit second data messages with the control commands to at least one of the protective devices or the controllable operating equipment.

4. The method according to claim 1, which further comprises using the reference device to determine the reference data based on a digital twin of the power grid.

5. The method according to claim 1, which further comprises using a meter data management system to aid the reference device in determining the reference data.

6. The method according to claim 1, which further comprises using the reference device to determine the reference data based on a state estimation for the power grid.

7. The method according to claim 1, which further comprises using the reference device to determine the reference data based on measurement data originating from a measuring device.

8. The method according to claim 7, which further comprises: assigning both the first phasor measurement unit and a measuring device to one busbar; using the measuring device as a second measuring device; and checking the assignment to the one busbar by using the reference device and taking topological information about the power grid into account.

9. The method according to claim 8, which further comprises: locating the first phasor measurement unit and a second phasor measurement unit at different ends of a transmission line; using the second phasor measurement unit for the second measuring device; and using the reference device to take an electrical model of the transmission line into account.

10. The method according to claim 1, which further comprises: using the communication device to receive first data messages including at least one of a time stamp or geographical coordinates; and using the reference device to determine each respective deviation between at least one of the time stamp or the geographical coordinates of the first phasor measurement unit and reference data for at least one of the time stamp or the geographical coordinates.

11. The method according to claim 10, which further comprises determining the reference data for at least one of the time stamp or the geographical coordinates by using the reference device and taking a time delay in the time stamp into account.

12. The method according to claim 10, which further comprises determining the reference data for at least one of the time stamp or the geographical coordinates by using the reference device and taking a previously-known geographical position of the first phasor measurement unit into account.

13. A grid control arrangement for a power grid, the grid control arrangement comprising: a first phasor measurement unit; a communication device configured to receive first data messages with first phasor measurement data from said first phasor measurement unit; and a reference device configured to determine a deviation between the first phasor measurement data and reference data; the first phasor measurement data being recognized as plausible when the deviation lies at least one of below a previously defined upper threshold value or above a previously defined lower threshold value.

14. The grid control arrangement according to claim 13, which further comprises a supervisory device configured to take the first phasor measurement data recognized as plausible into account for recognition of a critical system state and to determine countermeasures.

15. The grid control arrangement according to claim 13, wherein said reference device is configured to determine the reference data based on a digital twin of the power grid.

Description

BRIEF DESCRIPTION OF THE FIGURE

[0045] The FIGURE of the drawing is a block diagram showing one preferred exemplary embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0046] Referring now in detail to the single FIGURE of the drawing, there is seen a grid control arrangement 1 for a power grid (not illustrated), which includes a communication device 2 and a reference device 5 as well as a supervisory device 6.

[0047] A first phasor measurement unit 4 uses a data communication connection 8 to transmit first phasor measurement data z with a first data message 3, which is received by the communication device 2. A second measuring device 10 is embodied as a second phasor measurement unit, which transmits second phasor measurement data x with a second data message 17 by using a data communication connection 9. Both phasor measurement units 4, 10 are for example connected to the same busbar or connected over a line. In the latter case, the reference device 5 can calculate what phasor measurement data should be expected by taking an electrical model of the line into account.

[0048] The reference device 5 serves to determine a deviation between the first phasor measurement data z and reference data, in this case the second phasor measurement data x. In the case where the deviation lies below a previously defined upper threshold value and/or above a previously defined lower threshold value, the first phasor measurement data are recognized as plausible by the reference device 5 and forwarded to the supervisory device 6.

[0049] The supervisory device 6 can take the first phasor measurement data z recognized as plausible into account for recognition of a critical system state and can determine countermeasures, which can be transmitted by the communication device 2 with the aid of a data message 18 with control commands s to controllable operating equipment 7 such as a circuit breaker, for example, and can be implemented. The supervisory device 6 can additionally have a “Supervisory Control and Data Acquisition” (SCADA) functionality and create a dedicated state estimation for the electrical power grid. Moreover, a functionality for disturbance recognition on the basis of the state estimation can be provided.

[0050] Another possibility for a plausibility check exists if different measuring systems such as a PMU 11, which supplies phasor measurement data, and an RTU 12, which supplies measurement values in terms of magnitude for voltage and current intensity, are used at the same location. In such a case, by using the RTU measurement data, the supervisory device can create a state estimation from which the expectable phasor measurement data of the PMU can be deduced. The reference data thus obtained can then be compared with the phasor measurement data of the PMU 11 by the reference device 5, as explained initially.

[0051] By way of example, a meter data management system 15 and a geoinformation database 16, in which geographical positions of the PMUs 4,10,11 and of the RTU 12 are stored, can serve as further data sources for determining reference data.