Verfahren und Steuerungsvorrichtung zur Impedanzschätzung eines Stromnetzes

Details

Veröffentlichungs-Nr.

EP4811592

Anmeldetag

20. März 2025

Veröffentlichung

23. September 2026

Rechtsraum

EP

IPC

H02J3/38, G01R27/02

Abstract

The present disclosure relates to a computer-implemented method for impedance estimation of an electrical power network, wherein a voltage source converter, VSC, is electrically connected to the electrical power network via a point of common connection, PCC, the method comprising: upon detecting a fault perturbing an impedance (Zg) of the electrical power network so that a per-unit impedance (Zg) of the electrical power network deviates from a pre-fault value, determining a set of data points (xk , yk ) based at least on a plurality of measurements of an active power (Pg) and a reactive power (Qg) being exchanged between the VSC and the electrical power network via the PCC; performing a circle fitting on the set of data points (xk , yk ) to estimate a center point (xc_est, yc_est) and a radius (rc_est) of a quasi-power circle (Cqp ); and determining an estimated impedance (Zg_est) of the impedance (Zg) of the electrical power network based on the coordinates of the center point and radius, wherein Rg_est corresponds to an estimated fundamental frequency resistance of the electrical power network and Xg_est corresponds to an estimated fundamental frequency reactance of the electrical power network. A control device implementing the method and a power supporting system are also disclosed.

Anmelder

Firma

Hitachi Energy Ltd

Land

🇨🇭 Schweiz

Fachgebiete