Central Japan Railway Company

Fuji Electric Co., Ltd.

Toshiba Infrastructure Systems & Solutions Corporation

Hiroki Shimoyama

Kotaro Nakamura

Yuichi Ahiko

Hirokazu Kato

Kei Sakanoue

Yasushi Matsumoto

Hiroaki Otani

Tomoyuki Makino

Manato Mori

Tomotaka Nishijima

Toshiyuki Uchida

Junichi Ishii

Toshie Kikuchi

Provided is a collected current monitoring device enabling an analysis of collected current in each current collector while allowing a reduced equipment cost. The collected current monitoring device of the present disclosure is installed in a railroad vehicle including current collectors, main transformers, and main converters. The collected current monitoring device includes: a supply current sensor configured to measure a current supplied to a freely-selected one of the main transformers, at least one current-sensor-between-current-collectors disposed in each communication path connecting two adjacent ones of the current collectors and configured to measure a current flowing in the communication path, and a processor configured to calculate a current flowing in each of the current collectors based on the current measured by the supply current sensor and the current measured by the at least one current-sensor-between-current-collectors, and on a distribution ratio of the currents supplied to the main transformers.

Collected current monitoring device

Provided is a collected current monitoring device. A transformer current acquisition unit acquires a current value Iof a current flowing through a part of a plurality of transformers. A total collected current calculation unit calculates a current value Iof a collected current supplied by a plurality of current collectors from the current value Iby using a following Equation (1): I=I&#xd7;(M/M). A collected current acquisition unit acquires a current value Iof a collected current supplied by the current collector(s) other than one current collector. The collected current calculation unit calculates a current value Iof a collected current supplied by the one current collector by subtracting the current value Ifrom the current value I.

A collected-current monitoring device includes a current-value obtaining unit for obtaining current values Iand I; a first RMS-calculation unit for calculating a root mean square (RMS)of the current value Iat a window width W; a second RMS-calculation unit for calculating a root mean square (RMS)of the current value Iat the window width W; a determining unit for determining whether a combination of the RMSand the RMSsatisfies an abnormality condition; an abnormality-signal output unit for outputting an abnormality signal when the abnormality condition is satisfied; an information-obtaining unit for obtaining railway vehicle information; and a setting unit for setting a set-parameter that includes at least one of the window width W or the abnormality condition depending on the railway vehicle information.

Collected-current monitoring device

An electric vehicle control device includes: a plurality of motors capable of transmitting motive power to a wheel of an electric vehicle; an inverter that supplies electric power to drive the motors; and a controller that controls the inverter and compares, when the electric vehicle drives under a certain velocity condition, a q-axis voltage feedforward value VqFF and a q-axis voltage command value Vq* used for controlling driving of the motors, to detect an occurrence of miswire between the motors and the inverter when the following inequation is satisfied: VqFF&#x2265;1.5&#xb7;Vq*.

Electric vehicle control device

A controlling apparatus includes a storage unit for storing, for each sampling period, a combination of a primary frequency of connected induction motors and the amplitude of a voltage command value, and a gradient detection unit for calculating a value corresponding to an increase in the amplitude of the voltage command value divided by an increase in the primary frequency, and for outputting a failure signal upon determining, when a result of the division is less than a predetermined reference value, that the plurality of induction motors include at least one induction motor having a phase sequence that includes incorrect wiring with respect to the power converter.

Power system, power converter controlling apparatus, and electric vehicle having the power system

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Nagoya, Japan

Hiroki Shimoyama