JP3351631B2 - Electric car control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thyristor phase control type rectifier for converting AC power to DC power, and a variable voltage variable for converting DC power obtained from the rectifier into AC power and supplying the AC power to an induction motor. Frequency control device (VVVF
(Inverter device).

[0002]

2. Description of the Related Art Conventionally, a main circuit and a control circuit having a configuration as shown in FIG. 3 have been used as an electric vehicle control device including a rectifier of a thyristor phase control system and a VVVF inverter.

That is, as shown in FIG. 3, AC power is supplied from an AC overhead wire 1 to a primary side of a main transformer 4 via a pantograph 2 and a high-speed vacuum circuit breaker 3, and the voltage is reduced at a secondary side thereof. The AC power is supplied to a thyristor phase control type rectifier 5 to convert the DC power into DC power. The DC power is smoothed through a filter reactor 6, and a constant DC voltage is applied from a filter capacitor 7 to a VVVF inverter 8. ing.

The VVVF inverter device 8 converts DC power into AC power to convert a plurality of induction motors 9a to 9d.
The filter capacitor 7 is used to stably control each of the induction motors 9a to 9d.
It is important to control the rectifier 5 so that the voltage of the rectifier 5 is always constant.

On the other hand, as a recent electric vehicle control device, FIG.
As shown in FIG. 7, the DC power output from the rectifier 5 of the thyristor phase control method is applied to a plurality of VVVF inverters 8a to 8d provided in parallel, respectively, so that each VVV
A system is employed in which AC outputs obtained from the F inverter devices 8a to 8d are respectively supplied to induction motors 9a to 9d and individually controlled.

In this case, each VVVF inverter device 8a
8d are provided with filter reactors 6a to 6d and filter capacitors 7a to 7d, respectively.
Also in this system, it is important to control the control device 5 so that the voltage of the filter capacitor 7 is always constant for stably controlling the induction motors 9a to 9d as in the case of the collective control.

By the way, in the electric vehicle controller having the structure shown in FIGS. 3 and 4, in order to control the phase of each thyristor constituting the rectifier 5, the output voltage of the rectifier 5 itself is detected by the voltage detector 19. The detection signal is supplied to a pattern calculator 13 to generate an output voltage pattern signal based on the reference value 21. The output voltage pattern signal is processed by a firing angle calculator 16 to fire each thyristor. By doing so, the control is performed so that the output voltage of the rectifier 5 becomes constant.

[0008]

However, in the electric vehicle control device having the structure as shown in FIG. 3, since the filter reactor 6 exists between the rectifier 5 and the filter capacitor 7, load fluctuations and the like occur. Even if the filter capacitor voltage changes due to the occurrence of the above, there is a time delay from the detection of the voltage to the control of the control device 5, and even if the thyristor gates of the rectifier 5 are controlled, the filter capacitor 7
Is not instantaneously equal to the output voltage of the rectifier 5.

In particular, in the electric vehicle control device having the structure shown in FIG. 4, each VVV provided in parallel with the rectifier 5
The filter reactors 6a to 6d and the filter capacitors 7a to 7d are connected to circuits connecting the F inverter devices 8a to 8d.
Are provided, the voltage of each set of filter capacitors 7a to 7d not only does not become equal to the output voltage of the rectifying device 5, but also each of the filter capacitors 7a to 7d
Since the voltage of d is different, the filter capacitor with the highest voltage may be over-voltage, which may shorten the life of the filter capacitor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to eliminate the control delay caused by a filter reactor existing between a rectifier and a filter capacitor and to make each thyristor of the rectifier smaller. An object of the present invention is to provide an electric vehicle control device capable of directly controlling a phase and setting a filter capacitor voltage to an optimum value.

[0011]

SUMMARY OF THE INVENTION The present invention, in order to achieve the above object, comprises an electric vehicle control device using the following means. According to the invention corresponding to claim 1, a plurality of variable voltage variable frequency control devices are connected in parallel to a rectifier that converts AC power input from the overhead line through a current collector to DC power, and each variable voltage variable frequency The input side of the control device is configured to provide a filter capacitor for providing a DC output of the rectifier obtained through a filter reactor to a corresponding variable voltage variable frequency control device as a constant DC voltage, and each variable voltage variable frequency control device In an electric car control device that converts DC power into AC power and controls each induction motor individually,
A voltage detector for detecting the voltage of each of the filter capacitors, a voltage selector for selecting a maximum voltage among the capacitor voltages detected by the voltage detector, and a capacitor voltage selected by the voltage selector being a constant voltage. A pattern calculating means for calculating a voltage pattern as much as possible, and a phase control means for controlling the phase of each semiconductor element constituting the rectifier based on the voltage pattern generated by the pattern calculating means.

[0012]

[0013]

In the electric vehicle control device according to the present invention, even if the voltage of each filter capacitor changes due to a load change or the like, the voltage selection means of the capacitor voltages detected by each voltage detector is used. Since each thyristor of the rectifier is controlled by the selected maximum voltage, there is no control delay due to the filter reactor, and each thyristor of the rectifier can be phase-controlled immediately and each filter capacitor voltage can be optimized. Becomes

[0014]

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a first embodiment of a train control device according to the present invention, and the same parts as those in FIG.

In FIG. 1, reference numeral 4 denotes a main transformer in which AC power is supplied from an overhead line 1 to a primary side via a pantograph 2 and a high-speed vacuum circuit breaker 3, and a step-down converter which appears on the secondary side of the main transformer 4. The obtained AC power is supplied to a thyristor phase control rectifier 5 that converts the AC power into DC power. The DC output of the rectifier 5 is smoothed through a filter reactor 6, and a constant voltage V
It is input to the VVF inverter device 8.

The VVVF inverter 8 converts DC power into AC power and converts the DC power into a plurality of induction motors 9a to 9d.
, Which are collectively controlled. In the electric vehicle control device having such a configuration, in the first embodiment, a voltage detector 10 is connected in parallel with the filter capacitor 7, and a capacitor voltage 11 detected by the voltage detector 10 is connected.
Is input to the voltage pattern calculator 13.

The voltage pattern calculator 13 calculates a voltage pattern signal 14 such that the capacitor voltage becomes the capacitor voltage reference value 12, and inputs the voltage pattern signal 14 to the phase control circuit 15. Further, the phase control circuit 15 controls the rectifier 5 by outputting a gate signal of each thyristor of the rectifier 5 based on the voltage pattern signal.

With such a configuration, when the voltage of the filter capacitor 7 changes due to a load change or the like, the capacitor voltage at that time is detected by the voltage detector 10 and input to the voltage pattern calculator 13, and the phase control circuit Since the phase of each thyristor of the rectifier 5 is controlled by the thyristor gate signal 16 output from 15, the detection delay by the filter reactor 6 is eliminated, the control device 5 can be controlled instantaneously, and the voltage of the filter capacitor 7 is reduced. It can be a constant value.

In the first embodiment, the case where four induction motors 9a to 9d are collectively controlled by one VVVF inverter device 8 has been described. However, two, three, five or more induction motors are used. Even in the case of collective control, it can be implemented in the same manner as described above.

FIG. 2 is a circuit diagram showing a train control device according to a second embodiment of the present invention. The same parts as those in FIG. 4 are denoted by the same reference numerals. In FIG. 2, reference numeral 4 denotes a transformer in which AC power is supplied from the overhead line 1 to the primary side via the pantograph 2 and the high-speed vacuum circuit breaker 3, and the reduced AC power appearing on the secondary side of the transformer 4 is The power is supplied to a thyristor phase control type rectifier 5 for converting into DC power.

The output terminal of the rectifier 5 has a plurality of VVs.
The VF inverter devices 8a to 8d are connected in parallel, respectively, and the filter reactors 6a to 6d for smoothing the DC output of the rectifier 5 are provided on each input side thereof, and the VVVF inverter devices 8a to 8d are provided by providing the filter capacitors 7a to 7d respectively. The configuration is such that a constant voltage is input to 8d.

Each of these VVVF inverter devices 8a to 8
d is for converting DC power of a constant voltage provided from each of the filter capacitors 7a to 7d into AC power and individually controlling the corresponding induction motors 9a to 9d.

In the electric vehicle control device having such a configuration, in the second embodiment, each of the VVVF inverter devices 8a to 8c is used.
8d filter capacitor 7a provided on the input side
7d are connected in parallel with the voltage detectors 10a to 10d, and the capacitor voltages 11a to 11d detected by the voltage detectors 10a to 10d are supplied to the maximum voltage selector 17, respectively, and selected by the maximum voltage selector 17. The input capacitor voltage 18 is input to the voltage pattern calculator 13.

The voltage pattern calculator 13 calculates a voltage pattern signal 14 such that the capacitor voltage becomes the capacitor voltage reference value 12, and inputs the voltage pattern signal 14 to the phase control circuit 15. Further, the phase control circuit 15 controls the rectifier 5 by outputting a gate signal of each thyristor of the rectifier 5 based on the voltage pattern signal.

With this configuration, even if the voltages of the respective filter capacitors 7a to 7d are different from each other, the capacitor voltages 11a to 11d detected by the respective voltage detectors 10a to 10d become the maximum voltage. The voltage is input to the selector 17 and the maximum capacitor voltage is selected by the maximum voltage selector 17 so that the voltage pattern calculator 1
3 is input.

Accordingly, the voltage pattern calculator 13 generates a voltage pattern signal such that the maximum capacitor voltage becomes the capacitor reference value, and supplies the voltage pattern signal to the phase control circuit 15. The thyristor gate signal output from the phase control circuit 15 Since the phase of each thyristor of the rectifier 5 is controlled by 16, not only is there no delay in detection by the filter reactor 6, but also the voltages of the filter capacitors 7 a to 7 d can be set to optimal values.

As a result, each filter capacitor 7
Since a to d do not become overvoltage, the life of the filter capacitor can be extended. Note that the second
In this embodiment, four VVVF inverter devices 8a to 8
Although the case where the induction motors 9a to 9d are individually controlled by d has been described, the same can be applied to the case where each induction motor is individually controlled using two, three, five, or more VVVF inverter devices. Things.

[0029]

As described above, according to the present invention, the phase of each thyristor of the rectifier can be immediately controlled without the control delay caused by the filter reactor existing between the rectifier and the filter capacitor, and the filter capacitor voltage can be controlled. Can be provided with an electric vehicle control device that can make the optimal value.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of an electric vehicle control device according to the present invention.

FIG. 2 is a circuit diagram showing a second embodiment of the electric vehicle control device according to the present invention.

FIG. 3 is a circuit diagram showing a conventional electric vehicle control device using a collective control method.

FIG. 4 is a circuit diagram showing a conventional electric vehicle control device using an individual control method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... overhead wire, 2 ... pantograph, 3 ... vacuum breaker, 4 ... main transformer, 5 thyristor phase control rectifier, 6, 6a-6d ... filter reactors, 7, 7
a to 7d: filter capacitor, 8, 8a to 8d ...
VVVF inverter device, 9a to 9d ... induction motor,
10, 10a to 10d: voltage detector, 12: capacitor reference value, 13: voltage pattern calculator, 15: phase control circuit, 17: maximum voltage selector.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60L 9/24 H02M 7/155 H02M 7/48 H02P 7/74

Claims (1)

(57) [Claims] 1. A plurality of variable voltage variable frequency controllers are connected in parallel to a rectifier that converts AC power input from a power line through a current collector into DC power.
Each variable voltage variable frequency control device is provided on its input side with a filter capacitor for providing the DC output of the rectifier obtained through a filter reactor as a constant DC voltage to the corresponding variable voltage variable frequency control device, and each variable voltage In an electric car control device that individually controls each induction motor by converting DC power into AC power by a variable frequency control device, a voltage detector that detects a voltage of each filter capacitor, and a voltage detector that detects the voltage of each filter capacitor Voltage selecting means for selecting the maximum voltage among the capacitor voltages, pattern calculating means for calculating a voltage pattern so that the capacitor voltage selected by the voltage selecting means is a constant voltage, and voltage pattern generated by the pattern calculating means. Phase control of each semiconductor element constituting the rectifier based on the Electric control apparatus characterized by comprising a phase control unit.