US 11,855,454 B2
Power supporting arrangement for a power grid operated as a virtual synchronous machine
Theodore Soong, Västerås (SE); and Jean-Philippe Hasler, Västerås (SE)
Assigned to Hitachi Energy Switzerland AG, Baden (CH)
Appl. No. 17/920,693
Filed by Hitachi Energy Switzerland AG, Baden (CH)
PCT Filed Apr. 23, 2020, PCT No. PCT/EP2020/061265
§ 371(c)(1), (2) Date Oct. 21, 2022,
PCT Pub. No. WO2021/213655, PCT Pub. Date Oct. 28, 2021.
Prior Publication US 2023/0178996 A1, Jun. 8, 2023
Int. Cl. H02J 3/42 (2006.01); H02J 3/48 (2006.01)
CPC H02J 3/42 (2013.01) [H02J 3/48 (2013.01); H02J 2203/20 (2020.01); H02J 2300/20 (2020.01)] 12 Claims
OG exemplary drawing
 
1. A method of controlling a voltage source converter of a power supporting arrangement to act as a virtual synchronous machine, the method comprising:
obtaining a measured power level of the converter;
processing the measured power level using a differential equation of an angular velocity of the virtual synchronous machine in order to obtain a control contribution, wherein the differential equation is a swing equation defining a change in the angular velocity of the virtual synchronous machine over time comprising a moment of inertia term and a damping term;
providing a phase angle of a physical quantity used to control the converter based on the control contribution;
monitoring an ability of the converter to act as a virtual synchronous machine;
based on the monitoring, determining that the converter lacks the ability to act as a virtual synchronous machine; and
adjusting the control contribution by increasing the damping term and/or decreasing the moment of inertia term in response to determining that the converter lacks the ability to act as a virtual synchronous machine.