Method and arrangement for ascertaining a load flow map within an ac-voltage power supply grid

Patent metadata

Field	Value
Publication number	US-12334726-B2
Application number	US-202217831767-A
Country	US
Kind code	B2
Filing date	Jun 3, 2022
Priority date	Dec 6, 2019
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A method for ascertaining a load flow map within an AC-voltage power supply grid, wherein a plurality of grid subscribers are each arranged at a respective grid connection point in the power supply grid, includes ascertaining, by each of the plurality of grid subscribers, a respective value reflecting an individual phase angle (ϕ) of the AC voltage of the power supply grid at the respective grid connection point of each of the plurality of grid subscribers. The method also includes transmitting the respective values in the form of data from the respective plurality of grid subscribers to a superordinate data receiver; and evaluating the data and generating a load flow map based on the values reflecting the individual phase angles (ϕ).

First claim

What is claimed:

1. A method for ascertaining a load flow map within a power supply grid using a central evaluation circuit, wherein a plurality of grid subscribers are each arranged at a respective grid connection point in the power supply grid, comprising:
ascertaining, using a respective phase detector circuit by each of the plurality of grid subscribers, a respective value reflecting an individual phase angle (ϕ) of an AC voltage of the power supply grid at the respective grid connection point of each of the plurality of grid subscribers;
transmitting, using a respective transmitter circuit, the respective values in the form of data from the respective plurality of grid subscribers to a superordinate data receiver circuit of the central evaluation circuit; and
evaluating the data reflecting the individual phase angles (ϕ) and generating a load flow map using a processor circuit of the central evaluation circuit based on the values reflecting the individual phase angles (ϕ),
wherein ascertaining the respective value reflecting the individual phase angle (ϕ) of the AC voltage of the power supply grid at the respective grid connection point comprises:
providing a time signal that defines an absolute and common time for the power supply grid;
receiving the time signal from a reference signal transmitter and from the plurality of grid subscribers;
ascertaining a reference time which reflects a reference phase angle (ϕr) of an AC voltage in the power supply grid at the reference signal transmitter;
ascertaining, by the plurality of grid subscribers, a respective individual phase time which reflects an individual phase angle (ϕ) of the AC voltage of the power supply grid at the respective grid connection point for each of the plurality of grid subscribers;
transmitting the reference time and the individual phase times to the superordinate data receiver circuit; and
ascertaining a respective individual phase shift (Δϕ) based on the reference time and the individual phase times for each of the plurality of grid subscribers;
wherein the load flow map is generated based on the individual phase shifts (Δϕ).

2. The method as claimed in claim 1 , wherein the time signal is a GPS signal.

3. The method as claimed in claim 1 , further comprising transmitting the individual phase angles (ϕ) from the respective plurality of grid connection points to the superordinate data receiver, and thereupon averaging the individual phase angles (ϕ), establishing an average value as an individual phase reference angle, and ascertaining the respective individual phase shifts (Δϕ) is performed in the superordinate data receiver.

4. The method as claimed in claim 1 , wherein the time signal is a GPS signal, and wherein characteristic geographic coordinates are ascertained from the GPS signal.

5. A method for ascertaining a load flow map within a power supply grid using a central evaluation circuit, wherein a plurality of grid subscribers are each arranged at a respective grid connection point in the power supply grid, comprising:
ascertaining, using a respective phase detector circuit by each of the plurality of grid subscribers, a respective value reflecting an individual phase angle (ϕ) of an AC voltage of the power supply grid at the respective grid connection point of each of the plurality of grid subscribers;
transmitting, using a respective transmitter circuit, the respective values in the form of data from the respective plurality of grid subscribers to a superordinate data receiver circuit of the central evaluation circuit; and
evaluating the data reflecting the individual phase angles (ϕ) and generating a load flow map using a processor circuit of the central evaluation circuit based on the values reflecting the individual phase angles (ϕ),
wherein ascertaining the respective value reflecting the individual phase angles (ϕ) of the AC voltage of the power supply grid at the respective grid connection points of the plurality of grid subscribers comprises:
ascertaining, by each of the plurality of grid subscribers, an individual phase angle (ϕ) reflecting the AC voltage of the power supply grid at the respective grid connection points;
averaging the individual phase angles (ϕ) for each of the plurality of grid subscribers over a predetermined period of time and establishing an average value as an individual phase reference angle; and
ascertaining a respective individual phase shift (Δϕ) based on the individual phase reference angle and each of the respective individual phase angles;
wherein the load flow map is generated based on the individual phase shifts (Δϕ), and

wherein averaging the individual phase angles (ϕ), establishing an average value as the individual phase reference angle, and ascertaining the respective individual phase shifts (Δϕ) at the plurality of grid connection points are performed, whereupon the ascertained respective individual phase shifts (Δϕ) are transmitted to the superordinate data receiver.

Assignees

• Sma Solar Technology Ag

Inventors

• Falk Andreas

Classifications

• H02J2103/35

  Grid-level management of power transmission or distribution systems, e.g. load flow analysis or active network management · CPC title

• H02J13/12 Primary

  Monitoring network conditions, e.g. electrical magnitudes or operational status · CPC title

• Y04S10/30

  State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge · CPC title

• H02J3/0012

  characterised by the contingency detection means in AC networks, e.g. using phasor measurement units [PMU], synchrophasors or contingency analysis · CPC title

• H02J2203/10

  Electricity · mapped topic