US 12,362,564 B2
Adaptive power oscillation damping controller for a grid-forming converter
Rasool Heydari, Västerås (SE); Hongyang Zhang, Stockholm (SE); Jean-Philippe Hasler, Västerås (SE); and Pinaki Mitra, Västerås (SE)
Assigned to Hitachi Energy Ltd, Zurich (CH)
Appl. No. 18/869,967
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed May 3, 2024, PCT No. PCT/EP2024/062251
§ 371(c)(1), (2) Date Nov. 27, 2024,
PCT Pub. No. WO2024/231273, PCT Pub. Date Nov. 14, 2024.
Claims priority of application No. 23171854 (EP), filed on May 5, 2023.
Prior Publication US 2025/0174998 A1, May 29, 2025
Int. Cl. H02J 3/24 (2006.01); H02J 3/38 (2006.01)
CPC H02J 3/241 (2020.01) [H02J 3/38 (2013.01); H02J 2300/28 (2020.01)] 12 Claims
OG exemplary drawing
 
1. A method for controlling a power unit connected at a connection point to a power grid, the method comprising:
obtaining, from a power oscillation damping (POD) controller, a POD signal based on a power oscillation in the power grid;
determining a gain value based on:
a difference between a first voltage measurement, measured at the connection point, and a first voltage reference, or
an estimated short circuit ratio (SCR) of the power grid;
adding the POD signal to an input signal of a power unit regulator to obtain an intermediate reference signal from the power unit regulator, wherein the input signal is based on a reference value for the power grid and a corresponding measured value of the power grid;
determining a combined reference signal based on adding the POD signal, multiplied by the gain value, to the intermediate reference signal; and
operating the power unit using the determined combined reference signal to damp said power oscillation in the power grid.