US 12,334,726 B2
Method and arrangement for ascertaining a load flow map within an ac-voltage power supply grid
Andreas Falk, Kassel (DE)
Assigned to SMA Solar Technology AG, Niestetal (DE)
Filed by SMA Solar Technology AG, Niestetal (DE)
Filed on Jun. 3, 2022, as Appl. No. 17/831,767.
Application 17/831,767 is a continuation of application No. PCT/EP2020/081539, filed on Nov. 9, 2020.
Claims priority of application No. 10 2019 133 405.5 (DE), filed on Dec. 6, 2019.
Prior Publication US 2022/0294263 A1, Sep. 15, 2022
Int. Cl. H02J 13/00 (2006.01)
CPC H02J 13/00002 (2020.01) [H02J 2203/10 (2020.01)] 5 Claims
OG exemplary drawing
 
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).