JPH0347042B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that when a compound-wound motor or a shunt-wound motor is used as a DC motor for driving an electric car in a DC electric railway, the DC current is The present invention relates to an electric vehicle control device that separately excites and controls the shunt field of an electric motor.

The details of the conventional system and the present invention will be explained below with reference to the drawings.

FIG. 1 is a circuit connection diagram showing an example of a constant voltage three-phase AC power supply device using a booster type inverter, which has been conventionally used in electric cars of DC electric railways.

In FIG. 1, 1 is a current collector, 2 is a current interrupter,
3 is a filter reactor, 4 is a filter capacitor, 5 is a separately excited current source inverter, 6 is a smoothing reactor for the separately excited current source inverter, 7 is a single phase voltage source inverter, 8 and 9 are the same power source for the voltage source inverter 7. 10 is a booster transformer, 11 is a primary winding of the booster transformer 10,
12 is a secondary winding of the booster transformer 10, 13 is a three-phase voltage type inverter, 14 is an AC filter for making the output voltage of the inverter 13 into a sine wave, 15
is the output transformer.

The separately excited current source inverter 5 and the single-phase voltage source inverter 7 are connected in series to constitute a booster section of a booster type inverter, and the DC output of the single-phase voltage source inverter 7 is input to the three-phase voltage source inverter 13.

The three-phase AC output of the three-phase voltage source inverter 13 is supplied via an AC filter 14 and an output transformer 15 as a low-voltage constant-voltage three-phase AC power source for auxiliary circuits such as heating and cooling systems of electric cars.

5a, 5b, 5c, and 5d are thyristors connected to a bridge circuit constituting a separately excited current source inverter (hereinafter referred to as a current source inverter) 5;
X′ is the connection terminal of the thyristor 5a, 5b arms;
Y' indicates the connection terminal of the thyristor 5c and 5d arms, and U' indicates the connection terminal of the gate turn-off thyristors 7a and 7b that constitute the single-phase voltage source inverter 7 (the feedback terminal connected in parallel to the gate turn-off thyristors 7a and 7b, respectively). ), V' is the connection terminal of the capacitors 8 and 9 connected in series, U ₀ , V ₀ , W ₀ are the three-phase output terminals of the three-phase voltage source inverter 13, U ₁ ,
V ₁ and W ₁ are the three-phase output terminals of the AC filter 14,
U ₂ , V ₂ , and W ₂ are three-phase output terminals of the output transformer 15. The following three-phase AC U ₀ , V ₀ , W ₀ , U ₁ , V ₁ ,
This will be explained as W ₁ , U ₂ , V ₂ , and W ₂ .

The connecting terminals U' and V' are connected to the primary winding 11 of the booster transformer 10, and the connecting terminals X' and Y' are connected to the secondary winding 12 of the booster transformer 10.

V _d1 is the DC voltage across the filter capacitor 4 , V _d2 is the DC output voltage of the single-phase voltage source inverter 7 , and V _b is the DC rectified voltage of the current source inverter 5 .

When the single-phase voltage source inverter 7 operates at a predetermined frequency, a square wave voltage _e1 with a peak value of V _d2 /2 is generated between terminals U' and V', and the AC input of the current source inverter 5 is A square wave voltage e ₂ transformed by the booster transformer 10 is connected between terminals X' and Y'.
occurs.

A positive or negative DC rectified voltage V _d is generated between points P and N by the AC output voltage e ₂ between terminals Occur.

Current source inverter 5 is controlled to keep the voltage V _d2 applied to capacitors 8 and 9 constant.

If the total voltage V _d2 to be applied to capacitors 8 and 9 is 1350V, then the DC voltage V _d1 is
When the voltage drops to 900V, the current source inverter 5 operates in the forward conversion region, and the voltage V _d becomes + at the N point with respect to the P point.
When the DC voltage V _d1 rises to 1800 V, the current source inverter 5 operates in the inverse conversion region and operates so that the voltage V _d becomes −450 V at the N point with respect to the P point.

That is, current source inverter 5 acts to keep the total voltage V _d2 of capacitors 8 and 9 constant,
The square wave AC voltages e 1 and e ₂ generated across the primary winding 11 and the secondary winding ₁₂ of the booster transformer are also kept constant.

The three-phase voltage source inverter 13 converts the DC voltage V _d2 , which is kept at a constant value, into three-phase AC outputs U ₀ , V ₀ , W ₀ , and the three-phase AC outputs U ₀ , V ₀ , W ₀ are supplied to the AC filter 1.
Due to the action of 4, three-phase AC U ₁ with a waveform close to a sine wave,
It is converted into V ₁ and W ₁ and used as a low-voltage constant-voltage three-phase AC power source for electric vehicle auxiliary circuits.

Fig. 2 is a main part connection diagram showing an example of a conventionally used DC compound motor control circuit for driving a DC electric vehicle, in which 1 is a current collector, 21 is a current interrupter, and 22 is a DC compound motor ( 22a is the armature of the motor 22, 22b is the series field of the motor 22, 22c is the shunt field of the motor 22, 23 is the resistance controller of the armature circuit of the motor 22, and 24 is the shunt field of the motor 22. This is a thyristor bridge that separately excites and controls the winding field 22c.

In FIG. 2, in order to simplify the explanation, one electric motor 22 is used as a representative, and illustrations of devices not directly related to the explanation are omitted.

The input power to the thyristor bridge 24 shown in FIG. 2 is supplied from the three-phase AC power supply U ₂ , V ₂ , W ₂ shown in FIG.

The operation in which the shunt field 22c is controlled by the variable voltage DC output (generated between terminals A and B) by phase control of six sets of thyristor arms constituting the thyristor bridge 24 is already well known. Since this is the case, we omit it.

When the three-phase AC power for the thyristor bridge 24 that controls the shunt field 22c of the electric motor 22 shown in FIG. 2 is supplied from the three-phase AC power supplies U ₂ , V ₂ , W ₂ shown in FIG. Since Tsuji 24 controls three-phase alternating current, the number of thyristors is large, and the inverter capacity is also large, so three-phase voltage source inverter 1
3. The AC filter 14 and output transformer 15 also have a capacity,
The shape becomes larger.

In addition, when the thyristor bridge 24 operates,
Three-phase AC power supply for thyristor bridge flow
The three-phase AC waveforms of U ₂ , V ₂ , and W ₂ are distorted, resulting in a problem that the operation of the three-phase AC load connected to the three-phase AC power supply U ₂ , V ₂ , and W ₂ is adversely affected.

Therefore, the present applicant filed an invention in Japanese Patent Application No. 58-89136 to solve the above-mentioned problems, which is shown in FIG.

FIG. 3 is a circuit connection diagram showing an example of an electric vehicle control device that combines a three-phase AC power supply device using a booster type inverter and a thyristor bridge for controlling the shunt field of an electric motor.

In FIG. 3, 30 is the booster transformer, 31 is the tertiary winding of the booster transformer 30, and 32 is the motor 2.
This is a single-phase thyristor bridge that controls the second shunt field 22c, and the other symbols are the same as those in FIGS. 1 and 2.

When the voltage e ₁ generated from the single-phase voltage type inverter 7 is input to the primary winding 11 of the booster transformer 30 as described above, the tertiary winding 31 receives a rectangular wave alternating current that is transformed in phase with the voltage e ₁ . A voltage e ₃ is generated.

The AC voltage _e3 is input to the thyristor bridge 32 as an AC power source, the thyristors constituting the thyristor bridge 32 are phase-controlled by a well-known method, and a variable voltage DC output (generated between terminals C and D) is generated. Therefore, the shunt field 22c of the motor 22 is separately excited controlled.On the other hand, the current source inverter 5, the single-phase voltage source inverter 7, the three-phase voltage source inverter 13, the AC filter 14, and the output transformer 15 are as shown in FIG. works similarly.

In FIG. 3, the shunt field 22c of the motor 22
The thyristor bridge 32, which controls ₂ ,
The negative effects on the load of V ₂ and W ₂ are almost eliminated.

Furthermore, since the three-phase voltage source inverter 13, the AC filter 14, and the output transformer 15 do not each require an output for the thyristor bridge 32, their capacities can be reduced and made smaller than in the case of FIG. 1.

Further, the thyristor bridge 32 can be made small in capacity by selecting the AC input voltage e ₃ to be a voltage suitable for controlling the shunt field 22c and reducing the number of thyristors required as a single-phase bridge.

However, in FIG. 3, the booster transformer 30
Since a current corresponding to the power required for the shunt field flows through the windings 11 and 31, the capacity of the booster transformer 30 increases, which reduces the advantages of the booster type inverter.

In addition, a thyristor bridge 32 for shunt field control
The effect of the overlap angle during commutation also appears on the winding 12, which may adversely affect the operation of the current source inverter 5.

The present invention has been made in order to eliminate such problems.

FIG. 4 is a circuit connection diagram showing an embodiment of an electric vehicle control device in which a three-phase AC power supply device using a booster type inverter according to the present invention is combined with a thyristor bridge for controlling the shunt field of an electric motor.

In FIG. 4, numeral 33 is a booster transformer, and the other symbols are the same as in FIG. 3.

In FIG. 4, the rectangular wave AC voltage e ₁ of the current source inverter 7 is directly input as the AC power supply for shunt field control, but the method of shunt field control is the same as in the case of FIG. 3.

In the booster type inverter, since the DC voltage V _d2 of the voltage source inverter 7 can be freely selected, the rectangular wave AC voltage e ₁ can also be arbitrarily selected.

Therefore, it is possible to set the AC voltage for shunt field control to a value suitable for the shunt field control circuit.

As explained above, by using the booster type inverter according to the present invention and the thyristor bridge for shunt field control of a motor that inputs the output of a single-phase voltage type inverter, it is possible to avoid increasing the capacity of the booster transformer. Also, the influence on the winding 12 due to the commutation effect of the shunt field control thyristor bridge 32 is eliminated.

If the DC voltage V _d2 is selected to be the optimal value that matches the conditions other than the shunt field control circuit, insert a single-phase transformer into the AC circuit for shunt field control, and select the power supply voltage for shunt field control to the optimal value. Needless to say, it can be done.

In this case, the sum of the capacities of the single-phase transformer and the booster transformer will be the same as the capacity of the booster transformer 30 in the case of FIG.

As explained above, the DC-
Provided is a constant voltage three-phase AC power supply device that inputs the DC output of a DC converter, and also provides a
By configuring a low-voltage small thyristor bridge for shunt field control of electric vehicle motors that receives the AC output of the voltage source inverter of the DC converter as input,
This has a great practical effect because it is possible to rationalize the overall equipment volume and improve the performance of the auxiliary circuit AC power supply device and the motor control device.

[Brief explanation of drawings]

Figure 1 is a circuit connection diagram showing an example of a three-phase AC power supply device using a booster type inverter used in electric cars of DC electric railways, and Figure 2 is an example of a DC compound motor control circuit for driving DC electric cars. 3 is a circuit connection diagram showing an example of an electric vehicle control device that combines a three-phase AC power supply using a booster type inverter and a thyristor bridge for controlling the shunt field of a DC compound motor. FIG. 4 is a circuit connection diagram showing an embodiment of an electric vehicle control device in which a three-phase AC power supply device using a booster type inverter according to the present invention is combined with a thyristor bridge for controlling the shunt field of a DC auxiliary motor. 1... Current collector, 2, 21... Current interrupter, 3...
Filter reactor, 4...Filter capacitor, 5...Separately excited current source inverter, 6...Smoothing reactor, 7...Single phase voltage source inverter, 8,
9... Capacitor, 10, 30, 33... Booster transformer, 11... Primary winding, 12... Secondary winding, 13... Three-phase voltage source inverter, 14... AC filter, 15... Output Transformer, 22... DC compound winding motor, 22a... Armature, 22b... Series winding field, 22c... Shunt winding field, 23... Resistance controller, 24, 32... Thyristor bridge, 31 …
...Tertiary winding.

Claims (1)

[Claims] 1. A separately excited current source inverter comprising a smoothing reactor and a plurality of controlled rectifying elements, a voltage source inverter comprising a plurality of controlled rectifying elements having an anti-parallel rectifier and a smoothing capacitor connected between DC terminals, and the above and others. The DC terminals of an excited current type inverter and a voltage type inverter are connected in series, the AC terminal of the voltage type inverter is connected to the primary winding of a transformer, and the secondary winding of the transformer is connected to the separately excited current type inverter. The electric vehicle is connected to an AC terminal of an inverter, and the AC output obtained from the AC terminal of the voltage type inverter is converted into DC by a control rectifier, and the field of the electric motor for driving the electric vehicle is pressurized and controlled. Control device.