Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Sumitomo Heavy Industries, Ltd.

Takeo Matsumoto

Yoshio Nagatsuka

Kotaro Matsuda

Takafumi Maruyama

Yoshitaka Ishikawa

Shouichi Kawamoto

An electric motor vehicle main circuit system includes an AC-DC switching circuit switching a supply destination of electric power according to a type of supplied power from an overhead wire, a transformer, a tap changer switching tap positions of the transformer, a CNV converting an output of the tap changer into a direct-current voltage, an AC contactor opening and closing a power supply path between the tap changer and the CNV, an FC accumulating an output of the CNV or the overhead wire, a CH stepping up an output of the FC, an FC accumulating an output of the CH, an INV converting an output of the FC into a desired alternating-current voltage, a DC contactor opening and closing a power supply path between the AC-DC switching circuit and the CH, and a control section controlling the tap changer, the AC contactor, the DC contactor, the CNV, and the CH.

Electric motor vehicle main circuit system

A control device for an AC electric vehicle that is applied to a configuration in which an SIV is connected to an intermediate DC circuit unit between a CONV that converts an AC voltage input through a main transformer to a DC voltage and an INV that converts the DC voltage to an AC voltage, in which a carrier frequency fc of the CONV is changed on the basis of initial temperature (initial value of Tcnv) of a converter main circuit element when a vehicle is stopped and input current Isiv of the SIV such that a temperature variation of a converter main circuit element when the vehicle is stopped is reduced.

Control device for AC electric vehicle

In a configuration in which an auxiliary power supply is connected to an intermediate link circuit of a main conversion unit, intermediate link voltage as input voltage of the auxiliary power supply is set at higher voltage depending on the main conversion unit as a main unit, and loss generated in a main circuit element of the auxiliary power supply increases; therefore, a problem has occurred that a cooling unit has to be increased in size. The main conversion unit recognizes a low-speed and stop state by monitoring a vehicle speed, and varies the intermediate link voltage corresponding to the vehicle speed; thereby, the loss generated in the main circuit element of the auxiliary power supply is reduced at the low-speed and stop state where cooling ability is decreased; as a result, small sizing and light weighting of the cooling unit is achieved.

Propulsion control apparatus

A power conversion device includes a converter-inverter controller for controlling a converter and an inverter. The power conversion device further includes a DC capacitor connected between the converter and the inverter and a DC capacitor voltage detector for detecting a DC capacitor voltage Efc between the connection ends of the DC capacitor. The converter-inverter controller provides variable control on the DC capacitor voltage Efc to the converter on the basis of the motor frequency of an AC motor, the DC capacitor voltage Efc, and a pulse mode. Within a predetermined range of motor frequencies, the converter-inverter controller fixes the PWM modulation factor of the inverter to a value mand provides operation control to the inverter, where the value mbeing to reduce a harmonic of a predetermined order included in the output voltage from the inverter.

Power conversion device

In a controller for an AC electric vehicle that includes a converter control unit controlling an operation of a PWM converter that converts an AC voltage inputted from an AC overhead line through a transformer into an DC voltage, arithmetic processing performed in the converter control unit is divided into at least first to sixth arithmetic processing blocks, the first to sixth arithmetic processing blocks are configured by an FPGA, and the first to third arithmetic processing blocks, and the fourth and fifth arithmetic processing blocks are configured to enable simultaneous parallel processing, respectively.

Controller for AC electric vehicle

A control apparatus for an AC electric motor vehicle including a converter that converts an AC voltage input from an AC overhead wire via a transformer into a DC voltage, an inverter that converts the DC voltage into an AC voltage, and a motor that is driven and controlled by the inverter includes: torque-command calculating units that calculate a torque command value of the motor and output the torque command value to the inverter; and a static inverter that supplies electric power to a load mounted on the AC electric motor vehicle.

Control apparatus for AC electric motor vehicle

In an electric car control apparatus for driving an induction motor, detection accuracy of a DC voltage is improved. A DC power supply device is provided which has a maximum potential terminal A, an intermediate potential terminal B, a minimum potential terminal C, an upstream side capacitorbetween the maximum potential terminal A and the intermediate potential terminal B, and a downstream side capacitorbetween the intermediate potential terminal B and the minimum potential terminal C. Also, an overvoltage suppression part is provided which includes a resistorand a thyristorbetween the maximum potential terminal A and the minimum potential terminal C. Further, provision is made for a downstream voltage sensorbetween the intermediate potential terminal B and the minimum potential terminal C, an upstream voltage sensorbetween a junction of the resistorand the thyristorand the intermediate potential terminal B, and a three level inverterconnected to the maximum potential terminal A, the intermediate potential terminal B and the minimum potential terminal C for supplying AC power to the induction motor. The three level inverteris controlled by using detected voltages of the downstream voltage sensorand the upstream voltage sensor

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Tokyo, Japan

Takeo Matsumoto