Kabushiki Kaisha Toshiba

Katsuhisa Inagaki

Kentaro Suzuki

Yosuke Nakazawa

Ryuta Hasegawa

Teruyuki Ishizuki

Satoshi Koizumi

Kazuaki Yuuki

Masayuki Nogi

Kiyoshi Kusunoki

Hiroki Miyajima

According to one embodiment, there is provided a generator excitation apparatus including a plurality of first power converters and a second power converter. The plurality of first power converters are electrically connected to windings of respective phases of rotors of a wound rotor type induction generator in which the windings of the rotors of the respective phases are electrically independent, and are configured to bidirectionally convert DC and AC. The second power converter is configured to bidirectionally convert DC and AC between DC sides of the first power converters and a three-phase DC power supply. The DC sides of the first power converters are electrically connected together to a DC side of the second power converter.

Generator excitation apparatus and power conversion system

In one embodiment, an electric power converting device includes a converter which converts a three-phase AC voltage output from a three-phase AC power source, into a DC voltage of each phase of a three-phase AC load, and an inverter which converts the DC voltage converted by the converter, into a single-phase AC voltage of each phase of the three-phase AC load. The converter includes for each phase of an electric power system a circuit which consists of a plurality of switching elements connected in series. The electric power converting device controls on/off of a switching element corresponding to one of phases of the electric power system in the converter such that a voltage which reduces fluctuation of a DC voltage applied between the converter and the inverter and corresponding to each phase of the three-phase AC load is output from the converter for each phase of the electric power system.

Electric power converting device and electric power converting method

A breakeris opened when a pantographis lowered. The pantographis connected to an overhead wire. Voltage and its phase of the overhead wire are detected by a detector. Power is supplied from a power storage deviceto a tertiary windingvia a power convertersuch that a primary side of the main transformerhas the same voltage and phase as the overhead wire so as to reversely excite the main transformer. When the voltage of the main transformerhas the same phase as the voltage of the overhead wire, the breakeris turned on and then the pantographis raised, to connect the overhead wireand the main transformerto each other, thereby preventing the occurrence of an excitation inrush current to the main transformer

Rolling stock system and control method thereof

Growing community of inventors

Higashiyamato, Japan

Katsuhisa Inagaki