JPS6020703A - Controller for electric railcar - Google Patents

Abstract

PURPOSE:To enable to select the arbitrary value of a shunt field controlling AC voltage by directly inserting the rectangular AC voltage of a current type inverter of booster type as a shunt field controlling AC power source. CONSTITUTION:A booster type inverter is composed of a separately-excited current type inverter 5, a voltage type inverter 7, a capacitors 8, 9, and a booster transformer 10 having the primary winding 11 and the secondary winding 12, and the DC output of the inverter 7 is supplied through a 3-phase voltage type inverter 13, an AC filter 14 and an output transformer 15 to 3-phase output terminals V2-W2. Further, the rectangular AC voltage e1 of the inverter 7 is supplied through a thyristor bridge 32 to the shunt field 22C of a DC compound motor. Thus, the AC voltage for cntrolling the shunt field can be set to the value adapted for the shunt field controller.

Description

DETAILED DESCRIPTION OF THE INVENTION When the present invention uses a compound-wound motor or a shunt-wound motor as a DC motor for driving an electric car in a DC electric railway,
This relates to an electric vehicle control device that separately excites the shunt field of the DC motor using a thyristor bridge ξζ that receives a low-voltage AC power source as an input.The details of the conventional system and the present invention will be explained below with reference to the drawings. explain.

Figure 1 is a circuit connection diagram showing an example of a constant voltage three-phase AC power supply device using a booster type inverter that has been conventionally used in electric cars of DC electric railways. In Figure 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 of a separately excited current source inverter, 7 is a single phase voltage source inverter, 8 and 9 are voltage 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 source inverter, 14 is an AC filter for converting the output voltage of the inverter 13 into a sine wave, and 15 is an output transformer. The separately excited current source inverter 5 and the single-phase voltage source inverter 7 are connected in series. The DC output of the single-phase voltage type inverter 13 is input to the three-phase voltage type inverter 13, and the three-phase AC output of the three-phase voltage type inverter 13 is connected to the booster type inverter. 5a, 5b, 5c, and 5d are separately excited current-type in-tweeters (hereinafter referred to as current-type A thyristor is connected to a bridge concave constituting an inverter (referred to as an inverter) 5, where X' is a connection terminal of the arms of thyristors 5a and 5b, and Y' is a thyristor 5c.

5d shows the connection terminal of the arm, U' is the gate turn-off thyristor a and 7 that constitute the single-phase voltage type inverter.
b connection terminal (gate turn-off thyristor a and 7
bl is also the connection point of the feedback diodes 7C and 7d connected in parallel, respectively), Y' is the connection terminal of the capacitors 8 and 9 connected in series, and U61 Vo e W.

is the three-phase output terminal of the three-phase voltage source inverter 13, UllV
hWt is the three-phase output terminal of the AC filter 14, U2 #
V2yW2 is a three-phase output terminal of the output transformer 15. The following three-phase AC Uo-vo-Wo, U1/vl-Wl, U2
・■2・W2 will be explained.

The connecting terminals U' and U' 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 (Is is the DC voltage across the filter capacitor 4, V
dz is the DC output voltage of the single-phase voltage type inverter 7, and vb is the DC rectified voltage of the current type inverter 5. When the single-phase voltage type inverter operates at a predetermined frequency, the voltage between the terminals U' and V' is a square wave voltage C! with a peak value of vd2/2. occurs, and a square wave voltage e2 transformed by the booster transformer 10 is generated between the AC input terminals X' and Y' of the current source inverter 5.0 AC output voltage e2 and current between the terminals X' and Y' Thyristors 5a, 5b, 5c, 5d of type inverter 5
Due to the ignition action of , a positive or negative DC rectified voltage vb is generated between points P and N.

The current source inverter 5 is controlled to keep the voltage Vdz applied to the capacitors 8 and 9 constant. If the total voltage Vdz to be applied to the capacitors 8 and 9 is 135
In the case of 0V, when the DC voltage Vd1 decreases to 900V, the current source inverter 5 operates in the forward conversion region and the voltage Vd1 decreases to 900V.
b is controlled so that the N point is +450V with respect to the P point, and when the DC voltage Vdt rises to 1800V, the current source inverter 5 operates in the inverse conversion region, and the N point becomes 1450V with respect to the voltage Vbf - P point. It works as expected.

That is, the current source inverter 5 acts to keep the total voltage Vds+ of the capacitors 8 and 9 constant, and the rectangular wave AC voltages el and e2 generated across the primary winding 11 and the secondary winding 12 of the booster transformer. is also kept constant.

The three-phase voltage source inverter 13 is a direct current that is kept at a constant value.
The current voltage Vdz is converted into three-phase AC UO・■0・WO, and the three-phase AC output UO-Vo-Wo has a waveform close to a sine wave due to the action of the AC filter 14.
1C is converted and used as a low-voltage constant voltage three-phase AC power supply for electric vehicle auxiliary circuits.0 Figure 2 is a main part connection diagram showing an example of a conventionally used DC compound motor control circuit for driving DC electric vehicles. 21 is a current interrupter, 22 is a DC compound motor (hereinafter referred to as the motor), 22a is the armature of the motor 22, 22b is the series field of the electric motor 22, and 22c is the motor 22. 23 is a resistance controller of the armature circuit of the motor 22, and 24 is a thyristor bridge that separately controls the shunt field 22c.

In Fig. 2, one electric motor 2 is used to simplify the explanation.
2 is used as a representative, and illustrations of equipment not directly related to the explanation are omitted.

The input power source of the thyristor bridge 24 shown in FIG.
It is supplied from the three-phase AC power supply U2, v2, and W2 in the figure.

Variable voltage DC output (terminals A-B
The operation in which the shunt field 22c is controlled by 1ζ (which occurs between

Thyristor bridge 249 that controls the shunt field 22'c of the electric motor 22 shown in FIG. In order to control three-phase AC, the number of thyristors is large, and the inverter capacity is also large, so three-phase voltage source inverter 13. AC filter 14, output transformer 1
5 also has a larger capacity and shape.

In addition, when the thyristor bridge 24 operates, the three-phase AC power supply U2, v2,
The three-phase AC waveform of W2 is distorted, and the three-phase AC power supply U2・v2・
This causes a problem that the operation of other three-phase AC loads connected to W2 is adversely affected.

Therefore, in order to solve the above-mentioned problems, the present applicant has filed an invention of Japanese Patent No. 36 [-i1'=t, No. 58-89136, 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 a booster transformer, 31 is a tertiary winding of the booster transformer 30, and 32 is a shunt field 2 of the motor 22.
A single-phase thyristor bridge that controls 2c.Other symbols are the same as in Figs. 1 and 2.〇Booster transformer 3
When the voltage generated from the single-phase voltage type inverter i is input to the primary winding 11 of 0 as described above, the tertiary winding 3
1 is a rectangular wave AC voltage e3 that is transformed in the same phase as the voltage 0.
The @AC voltage e3 generated is input to the thyristor bridge 32 as an AC power source, and the phase of the thyristors constituting the thyristor bridge 32 is controlled by a well-known method to output a variable voltage DC (generated between terminals C and D). The shunt field 22c of the electric motor 22 is controlled by separately excitation.

On the other hand, current type inverter 5. Single-phase voltage source inverter 71 Three-phase voltage source inverter 13. The AC filter 14゜output transformer 15 operates in the same manner as in Fig. 1. In Fig. 09J3, the thyristor bridge 32 that controls the shunt field 22c of the motor 22 is separated from the output side of the output transformer 15. Since the capacitances of the capacitors 8 and 9 are large, there is almost no adverse effect on the load of the three-phase AC power source U2, v2, W2 due to the commutation action of the thyristor bridge 32.

Also, three-phase voltage type inverter 13. Since the AC filter 141 output transformer 15 does not require an output for the thyristor bridge 32, the capacity can be reduced and the size can be made smaller than in the case of FIG. By selecting a voltage suitable for controlling the shunt field 22c and using a single-phase bridge to reduce the number of required thyristors, the capacitance can be made small.

However, in FIG. 3 1, a current corresponding to the power required for the shunt field flows through the windings 11 and 31 of the booster transformer 3o, so the capacity of the booster transformer 30 increases and the booster type inverter It will reduce the advantages of

Furthermore, the influence of the overlapping angle during commutation of the thyristor bridge 32 for shunt field control 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 that combines a three-phase AC power supply device using a booster type inverter according to the present invention and a thyristor bridge for controlling the shunt field of an electric motor. 33 is a booster transformer, and the other symbols are the same as those in FIG. 3. In FIG. The method is the same as in the case of FIG.

In booster type inverters, voltage source inverter 7
Since the DC voltage Vd2 can be freely selected, the rectangular wave AC voltage e1 can also be arbitrarily selected.

Therefore, it is possible to set the AC voltage for shunt field control to a value that is compatible with the shunt field control circuit ζζ. By using the thyristor bridge for controlling the winding field, it is possible to avoid increasing the capacity of the booster transformer, and the commutation effect of the thyristor bridge 32 for controlling the shunt field does not affect the winding 12. .

If the DC voltage Vdz is selected at the optimum value that matches the conditions other than the shunt field control circuit, it is possible to insert an AC circuitized single-phase transformer for shunt field control and select the optimum value for the power supply voltage for shunt field control. It goes without saying that 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 described above, there is provided a constant voltage three-phase AC power supply device that receives as input the DC output of a DC-DC converter consisting of a current source inverter, a single-phase voltage source inverter, and a booster transformer, and also provides a By configuring a low-voltage compact silice bridge for shunt field control of an electric car motor that receives the AC output of a voltage source inverter as input, the overall equipment volume of the auxiliary circuit AC power supply device and motor control device can be rationalized. This has a great practical effect because it can improve performance.

[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 device using a booster type inverter and a thyristor bridge for controlling the shunt field of a DC compound motor. The figure 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 compound motor. 1... Current collector, 2.21... Current interrupter, 3.
...Filter reactor, 4...Filter capacitor, 5...Separately excited current source inverter, 6...
...Smooth sliding axle, 7...Single-phase voltage type inverter, 8,9...Capacitor, 10,30.33.
...Booster transformer, 11... -Next winding, 1
2-...Secondary winding, 13...Mountain/three-phase voltage type inverter, 14...AC filter, 15...
Output transformer, 22...DC compound motor, 22a...
...Armature, 22b...Series winding field, 22c.
...Shunt field, 23...Resistance controller, 24
, 32...thyristor bridge, 31...
Tertiary winding. Patent applicant Toyo Denki Seizo Co., Ltd. Representative Atsushi Doi

Claims (1)

[Claims] 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, a feedback rectifier, and a smoothing capacitor connected between DC terminals; A DC-DC converter in which four DC terminals of a voltage source inverter and a voltage source inverter are connected in series, and the AC terminals of each of the current source inverter and the voltage source inverter are connected to two sets of windings of a transformer.
In the converter, the AC output obtained from the AC terminal of the voltage source inverter is converted to DC by a control rectifier, and the field of the electric vehicle driving motor is pressurized and controlled.
Electric vehicle control device port with I characteristics