JPH0561843B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides regenerative control of a shunt-wound motor using an armature chopper and a field chopper to improve transient response to disturbances during constant torque control by the field chopper. Regarding equipment.

[Background of the invention]

In general, regenerative braking control of a shunt motor at high speed using an armature chopper and a field chopper minimizes the current flow rate of the armature chopper and generates a constant torque because the voltage generated by the motor is high. , the field current is controlled by a field chopper.

FIG. 1 shows a block diagram of an example of a control device that performs this control.

In FIG. 1, the control device consists of an armature chopper control section A, a field chopper control section B, an armature current detection section C, and a field current detection section D. Consisting of a generator 1, an adder 2, an arithmetic unit 3, a phase shifter 4, and a gate amplifier 5, the field chopper control unit B includes a constant torque command generator 6, an adder 7, an arithmetic unit 8, and a phase shifter. 9 and a gate amplifier 10.

The computing unit 3 inputs the difference between the output of the armature current command generator 1 and the output of the armature current detector C,
Outputs the command value of the current flow rate of the armature chopper. At high speeds, the output of the armature current detector is larger than the output of the armature current command generator 1, so the conduction rate of the armature chopper is fixed to the minimum conduction rate, resulting in an uncontrolled state. Become.

At this time, the constant torque command generator 6 outputs a field current command value according to the output of the armature current detection section C so that a braking force determined by the operation is generated. The arithmetic unit 8 determines the conductivity of the field chopper so that the output of the constant torque command generator 6 and the output of the field current detector D match, and constant torque control is performed by the field chopper.

In this control device, when constant torque control is performed using the field chopper, if there is a fluctuation in the overhead wire, the field chopper is used for control. In general, field current control has a large inductance in the main circuit, so
The drawback was that fast response control could not be expected, and armature current fluctuations were large due to delays in field control.

In the figure, Mch is a chopper circuit, Fch is a chopper circuit, a is an armature, f is a field, Ia is an armature machine current, and If is a field current.

[Purpose of the invention]

The purpose of the present invention is to leave a control margin in the conduction rate without setting the armature chopper to the minimum conduction rate during high-speed regeneration, and to control the field by controlling the armature chopper with good responsiveness during catenary fluctuations. An object of the present invention is to provide a brake control device that compensates for the poor responsiveness of a brake pedal.

[Embodiments of the invention]

FIG. 2 shows a block diagram of the control device of the present invention. In FIG. 2, the difference from FIG. 1 is that the output of the adder 12 connected to the output of the duty ratio adjustment device 20 provided in the armature current control section and the output of the armature current command generator 1 is This point is used as an input signal to the arithmetic unit 2.

The conductivity rate monitor 11 in the conductivity rate adjusting device 20 is
When the conduction rate rm of the armature chopper reaches a predetermined conduction rate rt, it outputs a positive output. Adder 12 adds the output of duty ratio monitor 11 to the output of armature current command generator 1.

If this is input to the computing unit 2, the conduction rate rm of the armature chopper is set to the predetermined conduction rate.
It can be controlled to RT.

In addition, the time delay element 1 in the conduction rate adjusting device 20
3 is to delay detection for a certain period of time even if the armature chopper conductivity becomes smaller than the set value rt, and is a signal from another system that lowers the command value of the armature current due to a decrease in the overhead line voltage. When a certain armature current reduction command 15 is given, the conduction rate of the armature chopper is made smaller than the set value rt for a certain period of time.

If the set value rt of the current flow rate of the armature chopper is set to the minimum current flow rate plus the control margin when the overhead wire fluctuates, the current flow rate of the armature chopper during steady state will be constant rt, and when the overhead wire fluctuation By reducing the current flow rate of the armature chopper for a certain period of time, it is possible to suppress sudden changes in the armature current when the overhead wire fluctuates faster than before.

〔Effect of the invention〕

According to the present invention, since the conduction rate of the armature chopper can be controlled for a certain period of time, a quick response is possible when the overhead wire fluctuates, and the armature current can be stably controlled.

[Brief explanation of the drawing]

FIG. 1 is a conventional block diagram, and FIG. 2 is a block diagram of one embodiment of the present invention. A... Armature chopper control unit, B... Field chopper control unit, C... Armature current detection unit, D... Field current detection unit, X... Armature chopper current detection unit, Y... ...Field chopper conductivity adjustment device, Z...
...Brake command, Mch...Armature chopper, Fch
... Field chopper, 1 ... Armature current command generator, 6 ... Constant torque command generator, 15 ... Armature current reduction command, 20 ... Conductivity adjustment device.

Claims (1)

[Scope of Claims] 1. A braking control device for an electric vehicle having an armature chopper control section A and a field chopper control section B, wherein the electric vehicle is controlled by an armature chopper Mch and a field chopper Fch. Braking control is performed by regenerating electric power generated by a DC motor in which the armature current and field current are respectively controlled to the overhead wire, and the armature chopper control section A includes an armature current command generator 1 and , armature chopper current control device X,
It has a conduction rate adjustment device 20, and has a brake command Z.
By inputting the armature current reduction command 15 and the actual armature current detection value by the armature current detection section C, the armature chopper Mch is set so that the deviation between the armature current command and the actual armature current is reduced. The armature current command generator 1 inputs the brake command Z and outputs the armature current command, and the armature chopper current command generator X outputs the duty ratio command. The conduction rate adjustment device 20 outputs a conduction rate command according to the deviation between the value obtained based on the armature current command and the armature current reduction command 15 and the actual armature current detection value. A conductivity command, which is the output of the armature chopper conductivity control device The field chopper control unit B has a constant torque command generator 6 and a field chopper flow rate adjustment device Y,
By inputting the brake command Z, the actual armature current, and the actual field current detected value by the field current detector D, the field chopper Fch is set so that the deviation between the field current command and the actual field current decreases. The constant torque command generator 6 receives the brake command Z and the actual armature current and outputs the field current command, and the constant torque command generator 6 outputs the field current command by inputting the brake command Z and the actual armature current. The rate adjustment device Y is a braking control device for an electric vehicle that outputs a duty ratio command according to the deviation between a field current command and an actual field current detection value.