On the simulation of valve reactors

Abstract

A model of saturable valve reactor is investigated. Starting from the equivalent circuit diagram of a transformer, the relative differential permeability of the strip wound cores and the coefficient of coupling are identified as basic parameters. These parameters are determined with the help of impulse voltage measurements for a certain reactor with Silectron strip wound cores. Thereby new results are gained concerning the dynamic magnetization behavior of these cores. Simulation yields good agreement with measurement for impulse magnetization.

Valve saturable reactor iron losses of ultrahigh‐voltage direct current converter

“…Due to the complex non-linear characteristics of the valve saturable reactors and their interactions with the series connected power thyristors, approximate and experimental approaches were used historically for the studies of reactor iron losses [6][7][8][9][10][11]. Only after the development of computer aided simulation technologies, various numerical approaches were taken instead to simulate the non-linear characteristics of valve saturable reactors and the impact of the reverse recovery processes of series connected valve thyristors on valve saturable reactor iron losses [12][13][14][15][16][17][18][19][20][21].…”

“…In the long history of HVDC (high-voltage direct current), there has been a widespread view that the valve saturable reactor iron losses were mainly due to the discharging energy associated with the stray capacitances of the converter transformers and the valve hall wall bushings (referred as AC busbar stray capacitances hereafter), which in turn were associated with the turn-on voltage of the converter valves. The valve saturable reactor iron losses were not affected by the converter DC current of an HVDC scheme [17,[20][21][22][23].…”