Selbstdiagnoseverfahren von Offener Schaltung für Modulare Allzweckwechselrichter

Details

Veröffentlichungs-Nr.

EP3923432

Aktenzeichen

EP20305639

Anmeldetag

11. Juni 2020

Veröffentlichung

1. März 2023

Erteilung

1. März 2023

Rechtsraum

EP

IPC

H02H5/04H02M7/538G01R31/00// H02M1/32H02M7/483

Abstract

Self-diagnostic method (100) of open-circuit fault, in power switching blocks of a modular inverter comprising a plurality (k=1 .. n) of blocks (31a, 32a, 33a, 34a, 31b, 32b, 33b, 34b, 31c, 32c, 33c, 34c) in parallel per phase leg (5, 5a, 5b, 5c), and being provided with temperature sensors (6), said method comprising:- sampling and storing (130) temperatures data Tkp of said n blocks (k=1 .. n) in a phase leg measured by said temperature sensors at relevant sampling times t_SD with a relevant sampling interval Δt_SD;- comparing (150) said temperature data Tkp of each (k) block with previously sampled and stored temperature data Tkp−1of said each (k) block and considering a possible fault (FF) on one of said blocks if the following condition is not fulfilled: Tkp∈Tkp−1±Thwhere Th is a predefined temperature deviation threshold ;or- comparing (250) current temperature data Tkp of each (k) block with current average temperature data 1n−1∑i=1nTip and considering a fault (OF) on one of said blocks if the following condition is not fulfilled: Tkp∈1n−1∑i=1nTip±ThAV,i≠kwhere Th_AV is a predefined average temperature deviation threshold.The invention concerns also a test comprising a shoot-through procedure to identify open circuits in a block.

Anmelder

Firmen

Mitsubishi Electric R&D Centre Europe B.V.
Mitsubishi Electric Corporation

Land

🇳🇱 Niederlande

Fachgebiete