Author/Authors :
Yamada، نويسنده , , S and Kitagawa، نويسنده , , S and Chikaraishi، نويسنده , , H and Murai، نويسنده , , K and Mizuno، نويسنده , , Y and Saito، نويسنده , , F and Hayakawa، نويسنده , , A and Sawamura، نويسنده , , H and Ise، نويسنده , , T and Sato، نويسنده , , Y and Kaneko، نويسنده , , O and Nakamura، نويسنده , , Y and Satow، نويسنده , , T and Motojima، نويسنده , , O، نويسنده ,
Abstract :
In the early experiments of the LHD, the harmful third harmonic currents had been observed in the power line of the NIFS substation, when the fly-wheel motor generator (MG) for the neutral beam injection (NBI) reaccelerates between the plasma productions. The variable harmonic currents, which were estimated to be 1±6 and 1±12 ns, were induced through a Scherbius device. They extremely resonated to the circuit impedance of the power line. To stabilize electrical power in the site, following modifications were conducted: (1) reduction of the harmonic current from the Scherbius device; (2) reconnection of the power supplies of the SC coils and heating devices to suitable power feeders; (3) compensation of lagging reactive power of the MG. As a result, harmful harmonic currents were suppressed.
Keywords :
High-Pass Filter , LHD , Harmonic currents , Scherbius device
