JPH05184006A - Controller for electric vehicle - Google Patents

Abstract

PURPOSE:To realize quick and smooth starting by shortening the starting time of powering and regenerative braking even if a residual voltage exists in a DC coupling circuit, i.e., a capacitor. CONSTITUTION:Voltage on a DC stringing 2 is smoothed through a first filter 4, stepped down through a step-down chopper 6, and then smoothed through a second filter 8 thence it is fed through an inverter 9 to an induction motor 10. At the time of braking, energy generated from the induction motor 10 is fed through the inverter 9 to a booster chopper 7 which then returns a boosted voltage to the DC stringing 2. A voltage detector 12 detects the voltage on the DC stringing 2 and a voltage detector 13 detects the voltage of a capacitor 8b in the second filter 8. A controller 11A then controls the conduction rates at the time of starting the step-down chopper 6 and the booster chopper 7 based on thus detected voltages.

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 for controlling the speed of an electric vehicle, and more particularly to an electric vehicle control device for performing speed control at the time of power running start and regenerative braking start.

[0002]

2. Description of the Related Art FIG. 3 shows, for example, "Science of Electric Vehicle" (published by Electric Vehicle Research Society, February 1990, Vol. 43 No. 2, P1).
It is a circuit diagram which shows the conventional electric vehicle controller shown by 5-19). In the figure, 1 is a pantograph which is connected to a DC power supply (not shown) via a DC overhead wire 2 to supply DC power, and 3 is a switch which connects or disconnects the DC power supply and a circuit described below via the pantograph 1. ..

An inverse L-shaped filter 4 is connected to the switch 3 and is composed of a reactor 4a and a capacitor 4b. The inverted L-shaped filter 5 smoothes the input DC voltage. The output voltage of the filter 4 is connected to the filter 4 at the time of power running. Is a bidirectional chopper circuit composed of a step-down chopper 6 for stepping down and a step-up chopper 7 for outputting a voltage stepped up during regenerative braking to the filter 4. 8 is connected to this chopper circuit 5 and comprises a reactor 8a and a capacitor 8b, and a DC coupling circuit for smoothing the chopper output. 9 is connected to this DC coupling circuit 8 to convert the DC output of the DC coupling circuit 8 into a three-phase AC. It is a pulse width modulation inverter for conversion, and the filter 4, the chopper circuit 5, the series coupling circuit 8 and the inverter 9 are grounded.

Reference numeral 10 denotes an induction motor which is connected to the inverter 9 to convert electric energy into kinetic energy during power running to drive the electric vehicle and to reverse convert kinetic energy into electric energy during braking and output the same to the inverter 9. Reference numeral 11 denotes a control device that controls the opening and closing of the switch 3 and controls the switching of the step-down chopper 6, the step-up chopper 7, and the inverter 9 based on a power running command P or a braking start command B input from the outside.

Although a set of filters 4, a chopper circuit 5, a DC coupling circuit 8, an inverter 9 and an induction motor 10 is shown here, a plurality of sets may be connected in parallel.

Further, the step-down chopper 6 of the chopper circuit 5 has a control rectifying element whose anode is connected to the switch 3 via the reactor 4a, for example, a GTO thyristor 6a.
And a diode 6b which is connected in series with this thyristor 6a and whose anode is grounded. When the powering is performed, the control device 11 controls the conduction ratio to lower the output voltage of the filter 4 to a predetermined voltage and direct it to the DC coupling circuit 8. Output.

In the step-up chopper 7 of the chopper circuit 5, the cathode is connected to the switch 3 via the reactor 4a, the anode is connected to the connection point of the thyristor 6a and the diode 6b, and the anode is the above. GT with the cathode connected to the connection point and grounded
The O-thyristor 7b serves as the control device 11 during regenerative braking.
The duty ratio is controlled by the output voltage, and the output voltage of the DC coupling circuit 8 is raised to a predetermined voltage and output to the filter 4.

Further, the inverter circuit 9 is a three-phase bridge composed of a low voltage controlled rectifying element such as a series connection of transistors 9a and 9b, a series connection of transistors 9c and 9d, and a series connection of transistors 9e and 9f. Connection, the collectors of the transistors 9a, 9c and 9e are connected to the connection point of the chopper circuit 5 via the reactor 8, the emitters of the transistors 9b, 9d and 9f are grounded, and the direct current from the series coupling circuit 8 during power running Induction motor 1 by converting the output to an alternating voltage of variable voltage and variable frequency
By outputting 0, the speed of the electric car is controlled.

Next, the operation of the above-mentioned conventional example will be described.
First, the operation during powering will be described. When the power running command P is input to the control device 11 from a driver's cab (not shown), the control device 1
Reference numeral 1 closes the switch 3 to supply energy from the DC overhead wire 2 to the induction motor 10.

At the time of power running, the voltage of the DC overhead wire 2 such as DC
1500 V is supplied to the chopper circuit 5 via the pantograph 1, the switch 3 and the filter 4. In the chopper circuit 5, the step-down chopper 6 operates, and the step-down chopper 6 is
The controller 11 controls the conduction ratio to reduce the output voltage of the filter 4 to, for example, an average value of about 600V.

The conduction ratio of the step-down chopper 6 is determined by the thyristor 6
It determines the conduction time ratio of a, the voltage of the capacitor 4b is E _S , and the target value of the output voltage of the step-down chopper 6 is E _FC.
Then, the conduction ratio α of the step-down chopper 6 is α = E _FC / E
Controlled by _S.

The control device 11 calculates the above-mentioned flow rate α, converts the flow rate α into a switching state control signal G _ON1P , and commands the thyristor 6a of the step-down chopper 6 to switch according to the switching state control signal G _ON1P. To do. The output of the step-down chopper 6 is input to the DC coupling circuit 8, smoothed by DC, and then input to the inverter 9.

The inverter circuit 9 is switching-controlled by the control device 11, and converts the DC output of the DC coupling circuit 8 into an AC voltage having a variable voltage and a variable frequency to induce the induction motor 10.
Supply to. As a result, the induction motor 10 is controlled at a variable speed.

Next, the operation during regenerative braking will be described. When the braking start command B is input from the driver's cab, the control device 11 closes the switch 3 to operate the induction motor 10 as a generator, converts kinetic energy into electric energy, and the electric energy passes through the inverter 9. DC coupling circuit 8
Entered in. The DC coupling circuit 8 outputs the output voltage due to the charging of the capacitor 8b to the chopper circuit 5.

In the chopper circuit 5, the step-up chopper 7 operates, and the step-up chopper 7 is controlled in conduction ratio by the control device 11 to change the output voltage of the DC coupling circuit 8 to, for example, DC15.
Boost to 00V. Here, the conduction ratio β of the boost chopper 7
Is controlled to β = 1− (E _FC / E _S ).

The control device 11 calculates the above-mentioned flow rate β, converts the flow rate β into a switching state control signal G _ON2B , and commands the thyristor 7b of the step-up chopper 7 to _perform switching by the switching state control signal G _ON2B. .. Then, the output of the chopper circuit 5 is regenerated to the DC power source via the filter 4, the switch 3, the pantograph 1 and the DC overhead wire 2.

Thus, by using the step-down chopper 6 and the step-up chopper 7 for the voltage of the DC overhead wire 2,
The voltage of the capacitor 8b is kept low.

The operation of the step-down chopper 6 and the step-up chopper 7 by the controller 11 at the time of power running start and regenerative braking start will be described with reference to FIG. When powering (or regenerative braking) is started at time t _1, the conduction ratio is raised to a target value according to a predetermined exponential function as shown in FIG. The step-down chopper 6 or the step-up chopper 7 is controlled, and the output thereof rises to the target value according to the conduction ratio and is set to the target value 600V as shown in FIG. 4 (c). If the capacitor 8b has no residual voltage, the charging of the capacitor 8b starts at about time t ₁ .

However, when the residual voltage V ₀ is present in the capacitor 8b as shown in FIG. 4 (b) at the time of start-up at the time t ₁ , the step-down is performed by raising the conduction ratio as shown in FIG. 4 (a). Since the output voltage of the chopper 6 (or the input voltage of the boost chopper) is still 0V and smaller than the residual voltage V _{0 of} the capacitor 8b, the capacitor 8b is discharged. Then at time t ₂ ,
The voltage of the output voltage and capacitor 8b of the step-down chopper 6 is equal in V _1, a capacitor 8b begins to charge up to the target value. In addition, between the times t ₁ and t ₂ , for example, the conduction ratio when the step-down chopper 6 is activated ≦ (residual voltage V ₀ / E _{S of the} capacitor 8b).

[0020]

Since the conventional electric vehicle controller is constructed as described above, the output of the step-down chopper 6 when the residual voltage is present in the capacitor 8b at the time of power running start and regenerative braking start. Since the capacitor 8b is discharged until the voltage or the input voltage of the boost chopper 7 becomes equal to the residual voltage of the capacitor 8b, the charging of the capacitor 8b is delayed and the startup time becomes long. Therefore, there is a problem that it cannot start up quickly and smoothly.

The present invention has been made in order to solve such a problem, and when starting, even when there is a residual voltage in the capacitor of the DC coupling circuit, the starting time at the time of power running start and regenerative braking start can be reduced. An object of the present invention is to obtain an electric vehicle control device that can be shortened and can be started quickly and smoothly.

[0022]

An electric vehicle controller according to the present invention includes a first voltage detector for detecting a voltage of a DC overhead wire and a second voltage detector for detecting an output end voltage of a DC coupling circuit. And a control device for controlling the starting-time conduction ratio of the power converter provided between the filter and the DC coupling circuit based on the first and second detection voltages.

[0023]

In the present invention, the control device allows the first
By controlling the start-time conduction ratio of the power converter on the basis of the detection voltage of the DC overhead wire detected by the voltage detector and the output terminal voltage of the DC coupling circuit detected by the second detector,
Even if there is a residual voltage in the DC coupling circuit, power running and regenerative braking can be started quickly and smoothly.

[0024]

EXAMPLES Example 1. 1 is a circuit diagram showing a first embodiment of the present invention. In the figure, 1 to 10 are the same as those shown in FIG. 3, and 12 is connected to the pantograph 1.
A first voltage detector whose one end is grounded and detects the voltage of the DC overhead wire 2 is a second voltage detector 13 which is connected in parallel to the capacitor 8b and detects the voltage of the capacitor 8b.

Reference numeral 11A is a control device provided in place of the control device 11 shown in FIG.
Switching control of the inverter 9 as the electric power converter, and activation of the step-down chopper 6 and the step-up chopper 7 which constitute the chopper circuit 5 as the first electric power converter on the basis of the detection voltages of the voltage detectors 12 and 13. Controls the hourly flow rate.

Next, the operation of the above-described first embodiment will be described. A power running command P is input to the control device 11A from a driver's cab (not shown) during power running, and a braking start command B is input during regenerative braking. As a result, the control device 11A closes the switch 3 to form a circuit.

At the time of power running, a DC power source is supplied to the chopper circuit 5 via the DC overhead wire 2, the pantograph 1 and the filter 4. In the chopper circuit 5, the step-down chopper 6 controls the conduction ratio by the control device 11A to step down the output voltage of the filter 4. The reduced voltage is supplied to the induction motor 10 via the DC coupling circuit 8 and the inverter 9.

At the time of regenerative braking, the electric energy generated by the induction motor 10 is input to the chopper circuit 5 via the inverter 9 and the DC coupling circuit 8. In the chopper circuit 5, the boost chopper 7 operates and the boost chopper 7
Is controlled by the controller 11A to increase the output voltage of the DC coupling circuit 8. The boosted voltage is regenerated to the DC power source through the filter 4, the switch 3, the pantograph 1 and the DC overhead wire 2.

Further, the voltage detector 1 has a voltage E of the DC overhead wire 2.
_{The SO} is constantly detected, and the voltage detector 13 constantly detects the voltage E _{FCO of the} capacitor 8b.

Here, the control of the conduction ratio at the time of starting the control unit 11A will be described. Based on the voltage E _SO and the voltage E _FC0 , the control device 11A starts the step-down chopper 6 at the startup _conduction ratio α _0.
And the current flow rate β ₀ at startup of the boost chopper 7,
It is calculated that α ₀ = E _FC0 / E _S0 and β ₀ = 1- (E _FCO / E _SO ).

Therefore, at startup, the startup conduction ratios α ₀ and β ₀ have values that depend on the residual voltage of the capacitor 8b. Therefore, when the power running (or regenerative braking) is started at time t ₁ , the residual voltage V is applied to the capacitor 8b as shown in FIG. 2 (b).
_When there is _{0, the} starting flow rate α shown in FIG.
_{Since 0} (or β ₀ ) is calculated based on the residual voltage V ₀ , the output voltage of the step-down chopper 6 (or the input voltage of the step-up chopper 7) at time t ₁ is as shown in FIG. It becomes equal to the residual voltage V ₀ . As a result, the charging of the capacitor 8b is immediately started.

The steady operation after starting is the same as the conventional example.

As described above, in the first embodiment, the voltage detector 12 for detecting the voltage E _S0 of the DC overhead wire 2 and the capacitor 8b.
Of the step-down chopper 6 at the time of power running by controlling the _conduction ratio at startup of the chopper circuit 5 based on the voltages E _SO and E _FCO by the control device 11A. Since the output voltage or the input voltage of the boost chopper 7 at the time of regenerative braking becomes equal to the voltage of the capacitor 8b, the charging of the capacitor 8b will not be delayed even if the capacitor 8b has a residual voltage V ₀ . Therefore, the start-up time is shortened, and the start-up can be performed quickly and smoothly.

Example 2. Although the GTO thyristor is used as the controlled rectifying element of the chopper circuit in the first embodiment,
Similar effects can be obtained by using other switching elements.

Example 3. Although the induction motor is used in the first embodiment, the same effect can be obtained by using the DC motor.

[0036]

As described above, the present invention provides the first voltage detector for detecting the voltage of the DC overhead wire, the second voltage detector for detecting the output end voltage of the DC coupling circuit, and the first voltage detector. And a controller for controlling the starting-time conduction ratio of the power converter provided between the filter and the DC coupling circuit based on the detection voltage of the second voltage detector, whereby the DC coupling circuit has a residual voltage. Even if there is, there is an effect that the start-up time is shortened and the start-up can be performed quickly and smoothly.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a waveform diagram for explaining the operation of the first embodiment of the present invention.

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

FIG. 4 is a waveform diagram for explaining the operation of the conventional electric vehicle control device.

[Explanation of symbols]

 2 DC overhead wire 5 Chopper circuit 6 Step-down chopper 7 Step-up chopper 8 DC coupling circuit 9 Inverter 10 Induction motor 11A Control device 12 Voltage detector 13 Voltage detector

[Procedure amendment]

[Submission date] September 9, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Electric vehicle control device

[Claims]

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 for controlling the speed of an electric vehicle, and more particularly to an electric vehicle control device for performing speed control at the time of power running start and regenerative braking start.

[0002]

2. Description of the Related Art FIG. 3 shows, for example, "Science of Electric Vehicle" (published by Electric Vehicle Research Society, February 1990, Vol. 43 No. 2, P1).
It is a circuit diagram which shows the conventional electric vehicle controller shown by 5-19). In the figure, 1 is a pantograph which is connected to a DC power supply (not shown) via a DC overhead wire 2 to supply DC power, and 3 is a switch which connects or disconnects the DC power supply and a circuit described below via the pantograph 1. ..

[0003] 4 is connected to the switch 3, made of a reactor 4a and the capacitor 4b, first inverted L-shaped filter for smoothing the input DC voltage, the first full 5
The voltage boosted during regenerative braking and descending <br/> pressure chopper 6 made of controlled rectifiers such as GTO thyristors you down the output voltage of the first filter 4 is connected to the filter 4 first Fi
Controlled rectifier such as a GTO thyristor you output filter 4
It is a bidirectional chopper circuit formed by a boost chopper 7 made of. 8 is connected to the chopper circuit 5, chopper
Stable DC voltage and smoothing reactor 8a that smoothes output
A capacitor 8b as a direct current coupling circuit
2 of inverted L-shaped filter, 9 Yoko co of the second filter 8
The pulse width modulation inverter is connected to the capacitor 8b and converts a DC voltage into a three-phase AC .

Reference numeral 10 denotes an induction motor which is connected to the inverter 9 to convert electric energy into kinetic energy during power running to drive the electric vehicle and to reverse convert kinetic energy into electric energy during braking and output the same to the inverter 9. 11 constitutes a step-down chopper 6, step-up chopper 7 and the inverter 9 based on the power running command P or braking command B is input from the outside as well as controls the opening and closing of the switch 3 control
The control device controls the switching state of the control rectifying element .

[0005] Here, a set of the first filter 4,
Chopper circuit 5, the second filter 8, but shows a connection circuit of the inverter 9 and the induction motor 10, there is a case where a plurality of sets are connected in parallel.

The step-down chopper 6 of the chopper circuit 5 has a control rectifying element, for example, a GTO thyristor 6a whose anode is connected to the positive electrode side of the capacitor 4b, and this GT.
O thyristor is connected to 6a in series, the anode is in the connected diode 6b to the negative electrode side of the capacitor <br/> capacitors 4b, controlled conduction ratio by control device 11, the first fill
The output voltage of the filter 4 is reduced to a predetermined voltage and output to the second filter 8 .

Further, the step-up chopper 7 of the chopper circuit 5 has a cathode connected to the positive electrode side of the capacitor 4b,
The anode is the GTO thyristor 6a and the diode 6
The diode 7a connected to the connection point of b, the anode is connected to the connection point, and the cathode is the negative electrode of the capacitor 4b.
It is composed of a GTO thyristor 7b connected to the pole side , the conduction ratio is controlled by the controller 11 during regenerative braking,
The voltage of the service 8b is raised to the DC power supply voltage and the first filter 4
Output to.

Furthermore, the inverter circuit 9, Ri Na <br/> a three-phase bridge connection of low pressure controlled rectifier example transistors, and converts the time power line voltage of the capacitor 8b into an AC voltage of the variable voltage variable frequency The output of the induction motor 10 controls the speed of the electric vehicle.

Next, the operation of the above-mentioned conventional example will be described.
First, the operation during powering will be described. When the power running command P is input to the control device 11 from a driver's cab (not shown), the control device 1
1 that make up the circuit is closed and the switch 3.

[0010] Voltage for example DC1500V of dc overhead wire 2 is fed to the chopper circuit 5 via a pantograph 1, switch 3 and the filter 4. DC power line 2 during powering
For supplying energy to et the induction motor 10, Ji ® Tsu <br/> the path circuit 5, the step-down chopper 6 is operated, the step-down chopper 6, the control device 11 is controlled conduction ratio by the filter 4
Output voltage is reduced to, for example, an average value of about 600V.

The conduction ratio of the step-down chopper 6 is GTO
When the voltage of the capacitor 4b is E _S and the target value of the output voltage of the step-down chopper 6 is E _FC , the conduction ratio α of the step-down chopper 6 is α = E
It is controlled to _FC / _{E S.}

The control device 11 calculates the above-mentioned flow rate α, converts the flow rate α into a switching state control signal G _ON1P , and switches the GTO thyristor 6a of the step-down chopper 6 by the switching state control signal G _ON1P. Order. Then, the output of the step-down chopper 6 is input to the second filter 8 and DC-smoothed, and becomes the input of the inverter 9.

The inverter circuit 9 is switching-controlled by the control device 11, converts the voltage of the capacitor 8b into an alternating voltage having a variable voltage and a variable frequency, and supplies the alternating voltage to the induction motor 10. As a result, the induction motor 10 is controlled at a variable speed.

Next, the operation during regenerative braking will be described. When the braking command B is input from the driver's cab, the control device 11 closes the switch 3 and configures the circuit as in the power running mode. Induction
The electric motor 10 operates as a generator , converts kinetic energy into electric energy, and the electric energy is input to the capacitor 8b via the inverter 9 .

In the chopper circuit 5, the regenerative braking is started up.
The exciting current is supplied by the step-down chopper 6 only when
Post boost chopper 7 is operated, the boost chopper 7 is controlled conduction ratio by the control unit 11 boosts the voltage <br/> capacitor 8b for example DC1500V. Here, the duty ratio of the step-up chopper 7 beta is, beta = is controlled to _{1- (E FC / E S)} .

The control device 11 calculates the above-mentioned flow rate β, converts the flow rate β into a switching state control signal G _ON2B , and commands the GTO thyristor 7b of the step-up chopper 7 to _perform switching by the switching state control signal G _ON2B. To do. Then, the output of the chopper circuit 5 is regenerated to the DC power source via the filter 4, the switch 3, the pantograph 1 and the DC overhead wire 2.

Thus, by using the step-down chopper 6 and the step-up chopper 7 for the voltage of the DC overhead wire 2,
The voltage of the capacitor 8b is kept low.

The operation of the step-down chopper 6 and the step-up chopper 7 by the controller 11 at the time of power running start and regenerative braking start will be described with reference to FIG. When powering (or regenerative braking) is started at time t _1, the conduction ratio is raised to a target value according to a predetermined exponential function as shown in FIG. The step-down chopper 6 is controlled,
As shown in FIG. 4C, the output rises to the target value according to the current flow rate, and is set to the target value 600V. Capacitor 8
If there is no residual voltage in b, charging of the capacitor 8b starts at about time t ₁ .

However, when the residual voltage V ₀ is present in the capacitor 8b as shown in FIG. 4 (b) at the time of start-up at the time t ₁ , the step-down is performed by raising the conduction ratio as shown in FIG. 4 (a). since the output voltage of the chopper 6 is still smaller than the residual voltage V ₀ which is a capacitor 8b is 0V, the capacitor 8b is discharged. Followed by time t _2, the voltage of the output voltage and capacitor 8b of the step-down chopper 6 is equal in V _1, a capacitor 8b begins to charge up to the target value. Note that the times t _{1 to} t
Between the _two , for example, the conduction ratio at the time of starting the step-down chopper 6 ≤
A (residual voltage _V of the capacitor 8b 0 / _{E S).}

[0020]

Since the conventional electric vehicle controller is constructed as described above, the output of the step-down chopper 6 when the residual voltage is present in the capacitor 8b at the time of power running start and regenerative braking start. the capacitor 8b until voltage becomes equal to the residual voltage of the capacitor 8b is discharged, the charging of the capacitor 8b is delayed startup time becomes longer. Therefore, there is a problem that it cannot start up quickly and smoothly.

The present invention has been made in order to solve such a problem, and even at the time of starting, even when there is a residual voltage in the capacitor as the DC coupling circuit, the starting time at the time of power running starting and regenerative braking starting. It is an object of the present invention to provide an electric vehicle control device that can be started up quickly and smoothly.

[0022]

SUMMARY OF THE INVENTION An electric vehicle control device according to the present invention uses a step-down chopper of a first power converter for a direct current.
The voltage of the overhead wire is stepped down and this DC voltage is fed to the second power converter.
Supply and drive the output of this second power converter to the electric car
Supply to the load motor and
The power generated by the motive is transferred to the first through the DC coupling circuit.
Boosted by the boost chopper of the power converter of
In the electric vehicle control device that regenerates the above DC overhead line,
The first voltage detector for detecting the voltage of the DC overhead wire, and
A second voltage detector for detecting the voltage of the DC coupling circuit, and
Based on the detection voltage of the first and second voltage detectors,
No. 1 electric power converter, and a control device for controlling the starting-time conduction ratio .

[0023]

In the present invention, the control device allows the first
Controlling the start-time conduction ratio of the first power converter on the basis of the detected voltage of the DC overhead wire detected by the voltage detector and the output voltage of the DC coupling circuit detected by the second detector. Thus, even if there is a residual voltage in the DC coupling circuit, power running and regenerative braking can be started quickly and smoothly.

[0024]

EXAMPLES Example 1. 1 is a circuit diagram showing a first embodiment of the present invention. In the figure, 10 is similar to that shown in FIG. 3, 12 first voltage detector for detecting a voltage of the dc overhead line 2, 13 co down de <br/> as a DC coupling circuit A second voltage detector connected in parallel with the sensor 8b to detect the voltage of the capacitor 8b.

Reference numeral 11A is a control device provided in place of the control device 11 shown in FIG.
Passing along with controlling switching inverter 9 as a power converter, the voltage detector 12 and the first step-down chopper 6 and the boost chopper 7 constituting the chopper circuit 5 as the power converter based on the detection voltage of 13 Control the flow rate .

Next, the operation of the above-described first embodiment will be described. A power running command P is input to the control device 11A from a driver's cab (not shown) during power running, and a braking command B is input during regenerative braking. As a result, the control device 11A closes the switch 3 to form a circuit.

At the time of power running, a DC power source is supplied to the chopper circuit 5 via the DC overhead wire 2, the pantograph 1 and the filter 4. In the chopper circuit 5, the step-down chopper 6 controls the conduction ratio by the control device 11A to step down the output voltage of the filter 4. The reduced voltage is supplied to the induction motor 10 via the second filter 8 and the inverter 9.

During regenerative braking, the electric energy generated in the induction motor 10 is transferred to the inverter 9 and the second flap.
It is input to the chopper circuit 5 via the filter 8. In the chopper circuit 5, the step-up chopper 7 operates, and the step-up chopper 7 is subjected to conduction ratio control by the control device 11A, so
The voltage of the sensor 8b is boosted. The boosted voltage is regenerated to the DC power source through the filter 4, the switch 3, the pantograph 1 and the DC overhead wire 2.

Further, the voltage detector 1 has a voltage E of the DC overhead wire 2.
_{The SO} is constantly detected, and the voltage detector 13 constantly detects the voltage E _{FCO of the} capacitor 8b.

Here, the control of the conduction ratio at the time of starting the control unit 11A will be described. Based on the voltage E _SO and the voltage E _FC0 , the control device 11A starts the step-down chopper 6 at the startup _conduction ratio α _0.
And the current flow rate β ₀ at startup of the boost chopper 7,
It is calculated that α ₀ = E _FC0 / E _S0 and β ₀ = 1- (E _FCO / E _SO ).

Therefore, at startup, the startup conduction ratios α ₀ and β ₀ have values that depend on the residual voltage of the capacitor 8b. Therefore, when the power running (or regenerative braking) is started at time t ₁ , the residual voltage V is applied to the capacitor 8b as shown in FIG. 2 (b).
_When there is _{0, the} starting flow rate α shown in FIG.
_{Since 0} (or β ₀ ) is calculated based on the residual voltage V ₀ , the output voltage of the step-down chopper 6 (or the input voltage of the step-up chopper 7) at time t ₁ is as shown in FIG. It becomes equal to the residual voltage V ₀ . As a result, the charging of the capacitor 8b is immediately started.

The steady operation after starting is the same as the conventional example.

As described above, in the first embodiment, the voltage detector 12 for detecting the voltage E _S0 of the DC overhead wire 2 and the capacitor 8b.
Of the step-down chopper 6 at the time of power running by controlling the _conduction ratio at startup of the chopper circuit 5 based on the voltages E _SO and E _FCO by the control device 11A. Since the output voltage or the input voltage of the boost chopper 7 at the time of regenerative braking becomes equal to the voltage of the capacitor 8b, the charging of the capacitor 8b will not be delayed even if the capacitor 8b has a residual voltage V ₀ . Therefore, the start-up time is shortened, and the start-up can be performed quickly and smoothly.

Example 2. Although the GTO thyristor is used as the controlled rectifying element of the chopper circuit in the first embodiment,
Similar effects can be obtained by using other switching elements.

Example 3. Although the induction motor is used in the first embodiment, the same effect can be obtained by using the DC motor.

[0036]

As described above, the present invention provides the first voltage detector for detecting the voltage of the DC overhead wire, the second voltage detector for detecting the voltage of the DC coupling circuit, and the first and the second. Even if there is a residual voltage in the DC coupling circuit, it is possible to provide a control device that controls the starting-time conduction ratio of the first power converter based on the detection voltage of the second voltage detector. There is an effect that the startup time is shortened and the startup can be performed quickly and smoothly.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a waveform diagram for explaining the operation of the first embodiment of the present invention.

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

FIG. 4 is a waveform diagram for explaining the operation of the conventional electric vehicle control device.

[Explanation of Codes] 2 DC overhead wire 5 Chopper circuit 6 Step-down chopper 7 Step-up chopper 8b Capacitor 9 Inverter 10 Induction motor 11A Control device 12 Voltage detector 13 Voltage detector

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (1)

[Claims] 1. During powering, the voltage of a DC overhead wire is stepped down by a step-down chopper of a first power converter, and this step-down voltage is supplied to a second power converter via a DC coupling circuit, and this second power conversion is performed. The output of the power generator is supplied to the load motor that drives the electric car, and at the time of braking, the generated energy of the load motor is boosted by the boost chopper of the power converter through the DC coupling circuit and the boosted voltage is applied to the DC overhead wire. In a regenerative electric vehicle control device, a first voltage detector that detects the voltage of the DC overhead wire, a second voltage detector that detects an output end voltage of the DC coupling circuit, and the first and second An electric vehicle control device, comprising: a control device for controlling the starting-time conduction ratio of the first power converter based on the detection voltage of the voltage detector.