Converter control strategies for reactive power reduction and compensation in ITER

Abstract

A new method for reactive power compensation is proposed and applied to the ITER acldc converter units. It requires a capacitor bank permanently connected to the grid and rated for the peak reactive power absorbed from the converter units when controlled in sequential mode and a suitable control strategy which regulates the reactive power demand of the units in order to reduce that delivered by the HV grid. The description of the method and the results of its application to ITER converter units, obtained with a numerical simulation of the system, are reported in the paper.

Design and Analysis of the Main AC/DC Converter System for ITER

“…The associated active power and reactive power profiles absorbed from the grid vary accordingly. In particular, the reactive power should increase significantly with a decrease in converter output voltage [2] .…”

Reactive Power Compensation and Harmonic Suppression for Power Supply System of HT-7U Superconductive Tokamak

“…High power ac/dc converter systems, using 6-pulse or 12-pulse thyristor bridges, are often used in thermonuclear fusion experiments [l] [2]. Generally, AC power is delivered by a high voltage grid, so a high reactive power will bring about a large drop and a remarkable fluctuation of the grid voltage.…”