JPH06351105A - Apparatus and method for controlling electric railcar - Google Patents

Abstract

PURPOSE:To connect three-phase output lines from an inverter to an induction motor at the same phases each other by individually controlling rotating direction of induction motor by an individual control system for controlling the one motor by the one inverter. CONSTITUTION:When forward.reverse commands for indicating rotating directions of induction motors 4a-4d are output as drive commands from an ordering unit and the reverse command is input to controllers 6a, 6c, an output voltage, an output frequency are operated, and switching elements in inverters 3a, 3c are controlled ON/OFF. And, ON/OFF control of the elements are so conducted as to replace phase sequences of V-phase and W-phase outputs of three-phase AC outputs of the inverters 3a, 3c. On the other hand, the forward command is input to controllers 6b, 6d, the output voltage, the output frequency are operated, ON/OFF control of the elements in inverters 3b, 3d are conducted, and phase sequences of three-phase AC outputs U, V, W are controlled to the same state as they are.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle control device and an electric vehicle control method for controlling an electric motor for driving an electric vehicle.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram of an electric vehicle control device for controlling four induction motors by one inverter device.
The DC power collected by the pantograph 1 from an overhead wire (not shown) is converted into AC power by the inverter device 3 via the circuit breaker 2 that supplies and cuts off the circuit at the rear. Four driving electric motors (an induction motor is used as an example) 4a to 4d are connected to the output end of the inverter device 3, and rotation speed detectors 5a to 5d are attached to the induction motors 4a to 4d. . The control device 6 receives as inputs the number of revolutions of the induction motors 4a to 4d detected by the number of revolutions detectors 5a to 5d and information from a voltage / current detector (not shown) in the inverter device 3. From this information, the control device 6 calculates the output frequency / output voltage of the inverter device 3 by adding / subtracting a predetermined slip frequency to / from the rotation speeds of the induction motors 4a to 4d, and the switching element in the inverter device 3 is calculated. ON / OFF control is performed to control rotation of the induction motors 4a to 4d. The command unit 7 manages the driving command of the electric vehicle and the state of the electric vehicle. When the driving command is input from the command unit 7 to the control device 6, the electric vehicle is driven with the vehicle performance according to the driving command. As described above, communication is performed with the control device 6.

FIG. 5 is a diagram showing an example of a general vehicle body structure of an electric vehicle, and FIG. 6 is a diagram showing an underfloor portion of the electric vehicle. The vehicle body 8 is connected to the motor drive wheels 41a to 41d via a dolly 9, and the motor drive wheels 41a to 41d are connected to the induction motors 4a to 41d via gears.
It is connected to 4d. The motor-driven wheels 41a to 41d accelerate and decelerate the electric vehicle by the torque generated by the induction motors 4a to 4d. When the electric vehicle travels in the F direction, the induction motors 4a and 4c rotate counterclockwise when viewed from the opposite direction of the gears,
The induction motors 4b and 4d rotate clockwise when viewed from the opposite direction of the gears. In this case, the phase sequence of the three-phase outputs U, V, W of the inverter device 3 is determined based on the operation command given from the command unit 7. Therefore, when the phase sequence of the three-phase outputs U, V, W of the inverter device 3 is U, V, W, the induction motor 4a ...
Do not directly connect to the four-phase inputs U, V, W of 4d. For example, as shown in FIG. 6, for the induction motors 4a, 4c, the V phase and the W phase are inverted and the V of the inverter device 3 is inverted.
The phase is the W phase of the induction motors 4a and 4c, and the inverter device 3
It is necessary to connect the W phase to the V phase of the induction motors 4a and 4c.

[0004]

As described above, according to the conventional technique, it is necessary to switch the phase sequence of the three-phase output line from the inverter device in accordance with each rotation direction of the induction motor, and the terminal block and the like are connected to the vehicle body side. It had to be installed, which was a disadvantage in terms of the equipment on the side of the vehicle body, which is a limited space. Since a current containing harmonic components due to the switching of the inverter device flows through the three-phase output line from the inverter device and becomes a source of inductive interference to the ground signal equipment, it is necessary to shield the three-phase output line. is there. Therefore, the same treatment is required for the terminal block, and the structure is complicated. In addition, it is necessary to read the V-phase and the W-phase for the wire number indicating the electrical connection, which complicates the structure of the electric vehicle and the wiring work at the time of testing, which may cause problems such as incorrect wiring. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electric vehicle control device which eliminates the above-mentioned problems, simplifies the wiring between the inverter device and the induction motor, and reduces the installation space.

[0006]

In order to achieve the above object, in the invention according to claim 1, a plurality of inverter devices for converting DC power into three-phase AC power and three-phase output terminals of the plurality of inverter devices are provided. A plurality of driving electric motors that are individually connected to each other, a plurality of control devices that individually control a plurality of inverter devices, and a command unit that individually outputs operation commands to these plurality of control devices, The three-phase output terminal of the inverter device and the three-phase input terminals of the plurality of driving electric motors are electrically connected to each other through terminals in the same phase. In the invention according to claim 2, a plurality of inverter devices for converting DC power into three-phase AC power, a plurality of driving electric motors connected to three-phase output terminals of the plurality of inverter devices, and a plurality of inverter devices. A plurality of control devices for individually controlling the electric motors and a command unit for individually outputting a driving command to the plurality of control devices, and one driving electric motor that rotates in the same direction with respect to the traveling direction of the electric vehicle. Of the inverter device, and the three-phase output terminal of the inverter device and the three-phase input terminal of the driving motor are electrically connected to each other in the same phase. Further, in the invention according to claim 3, among the operation commands output from the command unit, the operation command indicating the rotation direction of the driving electric motor is individually output to the control device, and the three-phase of the inverter device is output according to the operation command. Control the output phase order.

[0007]

With the configuration described above, the operation command from the command unit is individually output to the control device, and the inverter device is individually controlled. When information indicating the rotation direction of the driving electric motor is input to the control device as the operation command, the switching timing is changed with respect to the inverter device to control the phase sequence of the three-phase output. Although the three-phase output of the inverter device and the driving motor are connected to each other in the same phase, the rotation direction of the driving motor can be freely controlled by controlling the phase sequence of the three-phase output of the inverter device. You can

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of an electric vehicle controller showing an embodiment of the invention described in claim 1. 2 is a block diagram of the control device, and FIG. 3 is a functional block diagram. The DC power collected by the pantograph 1 from an overhead wire (not shown) passes through a circuit breaker 2 that supplies and cuts off a circuit at the rear, and is supplied to a variable voltage variable frequency inverter device (hereinafter abbreviated as inverter device) 3a to 3d. Converted to phase AC power. Induction motors 4a to 4d are provided at the output terminals of the inverter devices 3a to 3d, respectively.
4d is connected, and rotation speed detectors 5a to 5d are attached to the induction motors 4a to 4d. Then, the control devices 6a to 6d control the rotation speeds of the induction motors 4a to 4d detected by the rotation speed detectors 5a to 5d and the inverter device 3.
Information is received as an input from a voltage / current detector (not shown) in a to 3d. From this information, the control devices 6a-6
d is the inverter device 3a by adding / subtracting a predetermined slip frequency to / from the rotation speeds of the induction motors 4a to 4d.
Output frequencies and output voltages of 3d to 3d are calculated, ON / OFF control of switching elements in the inverter devices 3a to 3d is performed, and rotation control of the induction motors 4a to 4d is performed.
The command unit 7 manages the operation command of the electric vehicle and the state of the electric vehicle, and outputs the operation command individually to the control devices 6a to 6d. The command unit 7 is, for example, a master controller or a monitor device operated by a crew member of an electric vehicle, and the operation command output indicates the rotation directions of the induction motors 4a to 4d individually controlled by the control devices 6a to 6d. Information is also included. Three-phase output U of the inverter devices 3a to 3d,
The phase sequence of V and W is individually determined based on the information indicating the rotation directions of the induction motors 4a to 4d. Therefore, in this embodiment,
The three-phase outputs U, V, W of the inverter devices 3a-3d are directly connected to the three-phase inputs U, V, W of the induction motors 4a-4d. In the control devices 6a to 6d, when the driving command of the electric vehicle is input from the command unit 7, the calculation units 61a to 61d are operated so that the electric vehicle is driven with the vehicle performance according to the driving command.
Calculates the output voltage / output frequency of the inverter devices 3a to 3d. The arithmetic units 61a to 61d are composed of, for example, microcomputers, and perform predetermined arithmetic operations using control software stored in advance in ROM or RAM.

For example, as shown in FIG. 5, when the electric vehicle is about to travel in the F direction, a forward / backward command indicating the rotation direction of each induction motor is output as a driving command from the command unit 7. The reverse command is output to the control devices 6a and 6c.
Then, the output voltage / output frequency is calculated in the calculation units 61a and 61c, and ON / OFF control of the switching elements in the inverter devices 3a and 3c is performed. Then, among the three-phase AC outputs of the inverter devices 3a and 3c, the switching elements are turned ON / O so that the V-phase output and the W-phase output are exchanged in phase order.
FF control is performed. In addition, the forward command is issued to the control devices 6b and 6d.
Is output to. Then, in the calculation units 61b and 61d, the output voltage
The output frequency is calculated, and ON / OFF control of the switching elements in the inverter devices 3b and 3d is performed. Then, the phase sequence of the three-phase AC outputs U, V, W of the inverter devices 3b, 3d is controlled as it is. In this way, the switching elements in the inverter devices 3a to 3d are turned on and off.
By controlling the control individually based on the forward / backward commands from the command unit 7, the induction motors 4a, 4c connected to the output terminals of the inverter devices 3a, 3c to which the backward commands are given.
As shown in FIG. 6, c rotates counterclockwise when viewed from the opposite direction of the gear. Further, the induction motors 4b and 4d connected to the output terminals of the inverter devices 3b and 3d to which the forward command is given.
Rotates clockwise when viewed from the opposite direction of the gear. Therefore, as shown in FIG. 5, the electric vehicle travels in the F direction in the figure.

A forward command and a backward command that determine the rotation direction of the induction motor will be specifically described. 3A and 3B are diagrams showing ON / OFF timings of switching elements in the inverter device, FIG. 3A is a configuration diagram of the inverter device, and FIG. 3B is an ON / OFF time chart of the switching elements.
When a forward command is output from the command unit 7 to a control device 6, the switching elements S1 to S6 of the inverter device 3 connected to the control device are ON / OFF controlled in the order shown in FIG. 3 (b). Is done. Similarly, when a reverse command is issued, the switching elements S1 to S6 are similarly ON / OFF controlled in the order shown in FIG. Therefore, the induction motor 4 can rotate counterclockwise with a forward command, and can rotate clockwise with a reverse command.

As described above, by individually controlling the rotation direction of the induction motor by the individual control system in which one induction motor is controlled by one inverter device, the three-phase output line from the inverter device to the induction motor is controlled. In-phase can be connected to each other. Therefore, there is no need to consider re-reading the line number when wiring.

FIG. 4 is a block diagram of an electric vehicle controller showing an embodiment of the invention as defined in claim 2. In FIG. In this embodiment, two induction motors 4a and 4c are connected to one inverter device 3e.
In addition, when controlling the two induction motors 4b and 4d with one inverter device 3f, a reverse command is given to the control device 6e,
By giving a forward command to the control device 6f, it is not necessary to switch the phase sequence of the three-phase output lines from the inverter devices 3e and 3f to the induction motors 4a to 4d in accordance with the rotation directions of the respective induction motors. The same effect as the described invention can be expected.

In the embodiments described in detail, the case where the number of control devices is four has been described. However, since the present invention is concerned with each control device, the number of target control devices is arbitrary.

[0014]

As described above, according to the first to third aspects of the invention, the control device individually sets the phase sequence of the three-phase AC output of the inverter device in accordance with the rotation direction of each induction motor. By controlling, the inverter device and the induction motor can be connected in phase with each other, and the wiring can be simplified and the equipment space can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric vehicle control device according to a first aspect of the present invention.

FIG. 2 is a configuration diagram of a control device shown in FIG.

FIG. 3 is a functional block diagram.

FIG. 4 is a configuration diagram of an electric vehicle control device according to a second aspect of the invention.

FIG. 5 is a vehicle body configuration diagram of an electric vehicle.

FIG. 6 is a diagram showing an underfloor portion of an electric vehicle.

FIG. 7 is a configuration diagram of a conventional electric vehicle control device.

[Explanation of symbols]

 3a to 3f ... Inverter device 4a to 4d ... Induction motor 6a to 6f ... Control device 7 ... Command unit

Claims (3)

[Claims] 1. A plurality of inverter devices for converting DC power into three-phase AC power, a plurality of driving electric motors respectively connected to three-phase output terminals of the plurality of inverter devices, and the plurality of inverter devices. In an electric vehicle control device including a plurality of control devices that individually control each and a command unit that individually outputs an operation command to the plurality of control devices, a three-phase output terminal of the plurality of inverter devices and the plurality of inverter devices are provided. An electric vehicle control device characterized in that a three-phase input terminal of a drive motor is electrically connected to terminals of the same phase. 2. A plurality of inverter devices for converting DC power into three-phase AC power, a plurality of driving electric motors connected to the three-phase output terminals of the plurality of inverter devices, and the plurality of inverter devices individually. In a control device for an electric vehicle including a plurality of control devices that control the electric vehicle and a command unit that individually outputs a driving command to the plurality of control devices, the drive device that rotates in the same direction with respect to the traveling direction of the electric vehicle. An electric vehicle characterized in that an electric motor is connected to one inverter device, and a three-phase output terminal of the inverter device and a three-phase input terminal of the driving electric motor are electrically connected to each other in the same phase. Control device. 3. Inverter devices for converting DC power into three-phase AC power are connected in parallel in a plurality of stages, and driving motors are connected to the three-phase output terminals of these inverter devices, respectively. Based on the operation command indicating the rotation direction of each of the drive motors according to the direction, the phase order of the three-phase output of the inverter device is controlled, and the rotation direction of the drive motor to be controlled is individually controlled. An electric vehicle control method characterized by controlling.