JP2001211550A - Starting method for power-interchange device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power-interchange device capable of reducing a loss at an operating time without the need for setting a startup rotating machine. SOLUTION: The power-interchange device comprises a first induction machine, which is mounted in between two power systems respectively having a different frequency, wherein a primary winding is connected to one power system and a secondary winding is connected to another power system, and a second induction machine wherein a primary winding is connected in parallel with the primary winding (or the secondary winding) of the first induction machine, wherein a secondary winding is connected to the secondary winding (or the primary winding) of the first induction machine through an electronic power converter, and wherein a rotor is mechanically connected to the rotor of the first induction machine. Then the device is started by feeding a variable frequency current to the secondary winding from a stationary power converter in such state that the primary winding of the first induction machine is short- circuited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for starting a power interchange device.

[0002]

2. Description of the Related Art FIG. 14 is a block diagram of an embodiment showing a method of starting a conventional power interchange device. In the figure, 1 and 2 are first and second systems linked to each other via a power interchange device 300. The power interchange device 300 is composed of a first attraction machine 3, a second attraction machine 4, a stationary power converter 5, and a starting rotating machine 10. The first inducer 3 has a primary winding P connected to the first system 1 via a switch 6 and a secondary winding S connected to a second system 2 via a switch 7, respectively. It is connected. The second induction machine 4 has its rotor mechanically coupled to the rotor shaft of the first induction machine 3, and its primary winding P is connected via a switch 8 to the first system. 1 and a secondary winding S are connected to the second system 2 via a static power converter 5 and a switch 9, respectively.

The static power converter 5 operates when the power interchange device is connected to the system and during the power interchange operation to supply a variable frequency current to the secondary winding of the second induction machine 4. It is. The starting rotating machine 10 is usually constituted by an electric motor, and the first induction machine 3 and the second induction machine 4 are used.
This is mechanically directly connected to the rotor and works when the power interchange device 30 is started.

[0004] The power interchange device 300 configured as described above.
Controls the rotation speed of the first induction machine 3 by performing secondary excitation control of the second induction machine 4 by means of the static power converter 5, and controls the rotation speed of the first induction machine 3 between the first system 1 and the second system 2. It is a system that controls the tide.

[0005] The starting method of the power interchange device 30 is as follows. That is, when starting the first induction machine 3 and the second induction machine 4, the switches 6 and 8 are opened, and the switches 7 and 9 are closed. The starting rotating machine 10 is controlled to start starting in this state. After the speed of the rotor has increased to a predetermined speed, a variable frequency current is passed from the static power converter 5 to the secondary winding S of the second induction machine 4 to cause the first system 1 and the second induction machine The switch 8 is closed by synchronizing the primary winding P of FIG. After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5,
The primary winding P of the induction machine 3 is synchronized with the first system 1 to close the switch 6 to complete the start.

[0006]

In the conventional starting method described above, a starting rotating machine is required, so that capital investment and maintenance costs are incurred. In addition, the starting rotating machine is always connected to the rotating machine. Therefore, there is a problem that not only the loss at the time of operation increases, but also it is difficult to increase the stability of the shaft system because the shaft length of the rotating portion is long.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and an object of the present invention is to provide a starting method of a power interchange device which does not require a starting rotating machine.

[0008]

According to the present invention, there is provided a power transmission system in which a primary winding is connected to one power system and a secondary winding is connected to the other power system. 1
And a primary winding connected in parallel with a primary winding (or a secondary winding) of the first induction machine, and a secondary winding connected to the first winding through a static power converter. Power interchange device comprising a second induction machine connected to the secondary winding (or primary winding) of the induction machine and mechanically coupling the rotor to the rotor of the first induction machine The first induction machine and the second induction machine which originally constitute the power interchange device without using the starting rotating machine.
Induction motors, static power converters and switches, transformers,
By connecting switches and the like and controlling those devices, the rotating unit is accelerated to near the synchronous speed, and the first induction machine and the second induction machine are arranged in parallel with the system. . By employing the above method, it is possible to start the electric power interchanger without starting a rotating machine.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the embodiment, the same elements as those in FIG. 14 described above are denoted by the same reference numerals, and description thereof will be omitted. In the following description, 3 is used for convenience.
Is described as a first inducer and 4 as a second inducer.
Either may be the first or the second.

FIG. 1 is a configuration diagram showing a first embodiment of the present invention. In FIG. 1, reference numeral 301 denotes a new power interchange device corresponding to the conventional power interchange device 300, and is provided between the first system 1 and the second system 2. Reference numeral 11 denotes a starting switch for three-phase short-circuiting the primary winding P of the second induction machine 4 when the power interchange device 301 is started.

In starting the power interchange device, when the switches 6 and 8 are open and the switches 7 and 9 are closed, the starting switch 11 is closed and the induction motor 4 is closed. Of 1
The next winding P is short-circuited in three phases. After that, the static power converter 5
Then, a variable frequency current is supplied to the secondary winding S of the second induction machine 4 to increase the speed of the rotor of the second induction machine 4 to near the synchronous speed. Then, once the supply of the variable frequency current from the static power converter 5 is stopped, the starting switch 11 is opened, and the static power converter 5 is again connected to the second induction machine 4.
A variable frequency current is supplied to the next winding S, and the switch 8 is closed by synchronizing the first system 1 and the primary winding P of the second induction machine 4. After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5, the primary winding P of the first induction machine 3 is synchronized with the first system 1, and the switch 6 is closed. To complete startup.

According to the embodiment of the present invention described above,
Since a starting rotating machine is not provided unlike the conventional device, not only can the capital investment cost be reduced, but also the operating costs can be reduced, and the rotor shaft length can be shortened, thus improving the stability of the shaft system. be able to.

Next, the second embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 2, reference numeral 302 denotes a power interchanger, which is provided between the first system 1 and the second system 2. Reference numeral 11 denotes a start switch for short-circuiting the secondary winding S of the second induction machine 4 in three phases, and 12 denotes a switch for connecting the secondary winding S of the second induction machine 4 to the static power converter 5. , 13 are switches for connecting the primary winding P of the second induction machine 4 and the static power converter 5.

In FIG. 2, when starting the power interchange device, the starting switch 11 is closed while the switches 6 and 8 are open, the switches 7 and 9 are closed, and the induction motor 4 is closed.
, The secondary winding S is short-circuited in three phases, the switch 12 is opened, and the switch 1 is opened.
3 is closed.

Thereafter, a variable frequency current is supplied from the stationary power converter 5 to the primary winding P of the second induction machine 4 to increase the speed of the rotor of the second induction machine 4 to near the synchronous speed. I do. Then, once the supply of the variable frequency current from the static power converter 5 is stopped, the starting switch 11 and the switch 1 are turned off.
3 and the switch 12 is closed, and the static power converter 5 is again turned on.
A variable frequency current is supplied to the secondary winding S of the second induction machine 4 to synchronize the first system 1 and the primary winding P of the second induction machine 4 to close the switch 8. . After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5,
The primary winding P of the induction machine 3 is synchronized with the first system 1 to close the switch 6 to complete the start. According to the second embodiment, effects similar to those of the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 3, reference numeral 303 denotes a power interchange device, which is provided between the first system 1 and the second system 2. In the figure, reference numeral 14 denotes one of the second attractors 4
A stationary starter 15 provided on the secondary winding P side is a switch connecting the primary winding P of the second induction machine 4 and the stationary starter 14. 3, when starting the power interchange device, the switches 6 and 8 are opened, the switches 7 and 9 are closed, the switch 15 is closed, and the stationary starter 14 is invited. It is connected to the primary winding P of the motive 4.
Thereafter, the stationary starting device 14 applies the primary winding P of the second induction machine 4 to the secondary winding S of the second induction machine 4 with a DC or low-frequency current applied to the secondary winding S of the second induction machine 4. , The rotor of the second induction machine 4 is accelerated to near the synchronous speed. Then, the supply of the variable frequency current from the static power converter 5 is temporarily stopped, and the switch 15
, The variable frequency current is again passed from the static power converter 5 to the secondary winding S of the second induction machine 4, and the primary winding of the first system 1 and the second induction machine 4 The switch 8 is closed by synchronizing the line P. After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5, and the first induction machine 3
The primary winding is synchronized with the first system 1 and the switch 6 is closed to complete the start. In this embodiment, the capital investment cost is increased by the installation of the stationary starter 14 as compared with the first and second embodiments, but compared with the conventional example in which the starting rotating machine is always connected. Since the loss during operation does not increase and the shaft length of the rotating portion does not increase, the stability of the shaft system can be improved.

Next, the fourth embodiment of the present invention will be described with reference to the block diagram of FIG.
An embodiment will be described. In FIG. 4, reference numeral 304 denotes a power interchanger, which is provided between the first system 1 and the second system 2. A starting resistor 16 connects the secondary winding S of the second induction machine 4 via the switch 15.

In FIG. 4, when starting the power interchange device, first, the switch 15, the switch 8, the switch 12, and the switch 12 are opened, and the switch 7 and the switch 9 are closed, and the switch 15 is closed. Then, the starting resistor 16 is connected to the secondary winding S of the second induction machine 4. Thereafter, the switch 8 is closed, and the rotating portion of the second induction machine 4 is accelerated to near the synchronous speed. Then, switch 1
After opening the switch 5, the switch 12 is closed, and a variable frequency current is supplied from the stationary power converter 5 to the secondary winding S of the second induction machine 4. After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5, the primary winding P of the first induction machine 3 is synchronized with the first system 1, and the switch 6 is closed. To complete startup. According to the fourth embodiment, the same effect as that of the first embodiment can be obtained.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 5, reference numeral 305 denotes a power interchanger, which is provided between the first system 1 and the second system 2. Reference numeral 17 denotes a transformer whose secondary winding connected to the primary winding P of the second induction machine 4 has a rated voltage or less, and 18 denotes a secondary winding of the transformer 17 and the primary winding of the second induction machine 4. This is a switch for connecting the winding P. In FIG. 5, when starting the power interchange device, the switch 15, the switch 8, and the switch 12 are opened, the switch 7 and the switch 9 are closed, the switch 15 is closed, and the second guidance is performed. The starting resistor 16 is connected to the secondary winding S of the machine 4. Thereafter, the switch 18 is closed, and the rotating part of the second induction machine 4 is started with the reduced voltage. After the rotation speed is increased, the switch 18 is opened, the switch 8 is closed, and the rotating portion of the second induction machine 4 is accelerated to near the synchronous speed. Then, switch 1
After opening the switch 5, the switch 12 is closed, and a variable frequency current is supplied from the stationary power converter 5 to the secondary winding S of the second induction machine 4. After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5, the primary winding P of the first induction machine 3 is synchronized with the first system 1, and the switch 6 is closed. To complete startup. According to the fifth embodiment, effects similar to those of the first embodiment can be obtained.

Next, the sixth embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 6, reference numeral 306 denotes a power interchanger, which is provided between the first system 1 and the second system 2. In the case of the present embodiment, the first induction machine 3-2
A starting resistor 16 is connected to the next winding S via a switch. In FIG. 6, when starting the power interchange device, the switch 6, the switch 8, and the switch 7 are opened, and the switch 11 is closed with the switch 9 closed, so that the first induction machine 3 The starting resistor 10 is connected to the next winding. Thereafter, the switch 6 is closed, and the rotating portion of the first induction machine 3 is accelerated to near the synchronous speed. After that, after the switch 15 is opened, a variable frequency current is supplied from the static power converter 5 to the secondary winding S of the second induction machine 4 so that the first system 1 and the second induction machine 4 Of 1
The switch 8 is closed in synchronization with the next winding. afterwards,
The rotational speed of the second induction machine 4 is adjusted by the static power converter 5 and the secondary winding S of the first induction machine 3 and the second system 2
, The switch 7 is closed to complete the start. According to the sixth embodiment, the same effect as that of the first embodiment can be obtained.

Next, the seventh embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 7, reference numeral 307 denotes a power interchanger, which is provided between the first system 1 and the second system 2. In the case of the present embodiment, the voltage reducing transformer 1
7 is connected in parallel to the primary side switch 6 of the first attractor 3 side,
Further, a starting resistor 16 is connected to a secondary side of the first attractor 3 via a switch. In starting the power interchange device in FIG. 7, when the switches 6, 8, and 7 are open and the switch 9 is closed, the switch 15 is closed and the secondary of the first induction machine 3 is started. The starting resistor 10 is connected to the winding S. Thereafter, the switch 18 is closed and the first voltage is reduced.
Of the induction machine 3 is started. After the rotation speed is increased, the switch 18 is opened, the switch 6 is closed, and the rotating portion of the first induction machine 3 is accelerated to near the synchronous speed. Then, the switch 15
Is opened, and the second induction machine 4
A variable frequency current is supplied to the secondary winding of the first system 1 to synchronize the primary winding P of the first system 1 and the second induction machine 4 to close the switch 8. After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5, the secondary winding of the first induction machine 3 is synchronized with the second system 2, and the switch 7 is closed. Complete startup. According to the seventh embodiment, the same effect as that of the first embodiment can be obtained.

Next, an eighth embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 8, reference numeral 308 denotes a power interchange device, which is provided between the first system 1 and the second system 2. In the case of the present embodiment, a starting switch for three-phase short circuit is connected to the primary winding side of the first induction motor 3, and further,
The connection point between the secondary winding of the first induction machine 3 and the secondary winding of the second induction machine 4 and the static power converter 5 is connected by a switch 19. In starting the power interchange device in FIG. 8, the starting switch 10 is closed with the switches 6, 6, 7, 8 and 12 open, and the switches 9 and 11 closed. To short-circuit the primary winding of the first induction machine 3 for three phases. Thereafter, a variable frequency current is supplied from the stationary power converter 5 to the secondary winding of the first induction machine 3 to increase the speed of the rotating part of the first induction machine 3 to near the synchronous speed. Once the energization of the variable frequency current is stopped, the starting switch 10 is opened, and the switch 11 is opened.
And the switch 12 is closed. Thereafter, a variable frequency current is supplied again from the static power converter 5 to the secondary winding of the second induction machine 4 to synchronize the first system 1 and the primary winding P of the second induction machine 4. Switch 8 is closed. After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5,
The starter is completed by synchronizing the primary winding P of the first induction machine 3 with the first system 1 to close the switch 6. According to the eighth embodiment, the same effect as that of the first embodiment can be obtained.

Next, a ninth embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 9, reference numeral 309 denotes a power interchange device, which is provided between the first system 1 and the second system 2. In the present embodiment, the primary winding P
Side is connected to the connection point between the static power converter and the switch 12 via the second starting switch 19, and the three-phase short circuit of the secondary winding S of the first attractor is performed at the time of starting. The first start switch 11 is connected.

In FIG. 9, prior to starting the power interchange device, the switch 6, the switch 7, the switch 8, and the switch 12 are open, and the switch 9 and the first starting switch 11 are closed. so,
The second starting switch 19 is closed and the first induction machine 3-2 is closed.
Three-phase short-circuit the next winding. Thereafter, a variable frequency current is supplied from the stationary power converter 5 to the primary winding of the first induction machine 3 to increase the speed of the rotating part of the first induction machine 3 to near the synchronous speed. Once the supply of the variable frequency current is stopped, the first starting switch 11 is opened, the second starting switch 19 is opened, and then the switches 7 and 12 are closed.
After that, the static power converter 5 returns to the second induction machine 4 again.
A variable frequency current is applied to the secondary winding to synchronize the first system 1 and the primary winding P of the second induction machine 4 to close the switch 8. After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5, the primary winding P of the first induction machine 3 is synchronized with the first system 1, and the switch 6 is closed. To complete startup. According to the ninth embodiment, the same effect as that of the first embodiment can be obtained.

Next, an eighth embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 10, reference numeral 310 denotes a power interchange device, which is provided between the first system 1 and the second system 2. In the present embodiment, at the time of starting, the primary winding P side of the second attraction motor is three-phase short-circuited by the starting switch 11, and the switch 15 is further connected to the secondary winding S side of the first attraction device 3. The starting resistor 16 is connected via the power supply.

In FIG. 10, when starting the power interchange device, the starting switch 10 is closed with the switch 6, the switch 7, and the switch 8 open and the switch 9 closed, and the second guidance is performed. The three-phase short circuit of the primary winding P of the machine 4
5 is closed, and the starting resistor 16 is connected to the secondary winding S of the first induction machine 3. Thereafter, the second power from the static power converter 5
The switch 6 is closed in parallel with the supply of the variable frequency current to the secondary winding S of the induction machine 4 to bring the rotating parts of the first induction machine 3 and the second induction machine 4 to near the synchronous speed. Speed up. Once the supply of the variable frequency current is stopped, the starting switch 11 and the switch 15 are opened and the static power converter 5
The variable frequency current is supplied to the secondary winding S of the induction machine 4 of
Of the system 1 and the primary winding P of the second induction machine 4 to close the switch 8. After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5, and the secondary winding of the first induction machine 3 and the second system 2 are synchronized to establish the switch 7
Is closed to complete startup. According to the tenth embodiment, the same effect as that of the first embodiment can be obtained.

Next, an eleventh embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 11, reference numeral 311 denotes a power interchange device, which is provided between the first system 1 and the second system 2. This embodiment is different from the seventh embodiment in the first embodiment.
This is realized in combination with the first embodiment. FIG.
In starting the power interchange device, the start switch 11 is closed while the switches 6, 7, and 8 are open and the switch 9 is closed. Winding P
Are short-circuited, the switch 15 is closed, and the starting resistor 16 is connected to the secondary winding S of the first induction machine 3. Thereafter, the switch 1 is switched in parallel with the passage of the variable frequency current from the stationary power converter 5 to the secondary winding S of the second induction machine 4.
8 is closed and the rotating parts of the first induction machine 3 and the second induction machine 4 are started. After the rotation speed increases, the switch 18 is opened and the switch 6 is closed. When the rotation speed reaches the vicinity of the synchronous speed, the starting switch 11 and the switch 15 are opened after the current of the variable frequency current is stopped, and then the static induction power converter 5 and the second induction machine 4 A variable frequency current is supplied to the secondary winding S to synchronize the first system 1 and the primary winding P of the second induction machine 4 to close the switch 8. After that, the rotational speed of the second induction machine 4 is adjusted by the static power converter 5, the secondary winding S of the first induction machine 3 is synchronized with the second system 2, and the switch 7 is closed. To complete startup. According to the eleventh embodiment, effects similar to those of the first embodiment can be obtained. Next, a twelfth embodiment of the present invention will be described with reference to the configuration diagram of FIG. In FIG. 12, reference numeral 312 denotes an electric power interchanger,
Are provided between the systems 2. Reference numeral 11 denotes a starting switch for short-circuiting the secondary winding of the second induction machine 4 in three phases. Reference numerals 112 and 13 denote the stationary power converter 5 and the secondary winding S of the second induction machine 2, respectively. A switch for connecting the power converter 5 and the primary winding P of the second induction machine 2, 16 is a starting resistor, 15 is a connection between the starting resistor 16 and the secondary winding S of the first induction machine 3. Switch.

In FIG. 12, prior to starting the power interchange device, the starting switch is opened when the switches 6, 7, 7, 8 and 11 are open and the switches 9 and 13 are closed. 1
1 is closed to short-circuit the secondary winding S of the second induction machine 4 in three phases, and the switch 14 is closed to connect the starting resistor 16 to the secondary winding S of the first induction machine 3. . Thereafter, the switch 6 is closed in parallel with the passage of the variable frequency current from the stationary power converter 5 to the primary winding P of the second induction machine 4,
The rotating parts of the first induction machine 3 and the second induction machine 4 are accelerated to near the synchronous speed. Once the supply of the variable frequency current is stopped, the starting switch 11, the switch 13, and the switch 15 are opened, and then the switch 12 is closed, and the static power converter 5 is closed again.
A variable frequency current is supplied to the secondary winding S of the second induction machine 4 to synchronize the first system 1 and the primary winding P of the second induction machine 4 to close the switch 8. . After that, the rotation speed of the second induction machine 4 is adjusted by the static power converter 5,
The secondary winding of the first induction machine 3 and the second system 2 are synchronized to close the switch 7 to complete the start. According to the twelfth embodiment, the same effect as that of the first embodiment can be obtained.

Next, a thirteenth embodiment of the present invention will be described with reference to FIG.
An embodiment will be described. In FIG. 13, reference numeral 313 denotes a power interchanger, which is provided between the first system 1 and the second system 2. This embodiment is based on the embodiment shown in FIG.
Are connected via a switch 18. In FIG. 13, prior to starting the power interchange device, the switch 6, the switch 7, the switch 8, the switch 11 are opened, and the switch 9, the switch 12 are opened.
Is closed, the first starting switch 11 is closed, the secondary winding S of the second induction machine 4 is short-circuited in three phases, and the switch 1 is closed.
5 is closed, and the second starting resistor 16 is connected to the secondary winding S of the first induction machine 3. Thereafter, the switch 18 is closed in parallel with the passage of the variable frequency current from the stationary power converter 5 to the primary winding P of the second induction machine 4 so that the first induction machine 3
Then, the rotating unit of the second induction machine 4 is started. Thereafter, after the rotation speed increases, the switch 18 is opened, the switch 6 is closed, and the speed is increased to near the synchronous speed. Once the supply of the variable frequency current is stopped, the starting switch 11, the switch 13, the switch 15
Is opened, and then the switch 12 is closed, and a variable frequency current is passed from the static power converter 5 to the secondary winding S of the second induction machine 4 again to cause the first system 1 and the second induction machine 4 primary winding P
, The switch 8 is closed. Thereafter, the rotational speed of the second induction machine 4 is adjusted by the static power converter 5, the secondary winding S of the first induction machine 3 is synchronized with the second system 2, and the switch 7 is closed. To complete startup. This thirteenth
According to this embodiment, the same effect as that of the first embodiment can be obtained.

[0030]

According to the present invention described above, since the power interchange device can be started without a starting rotating machine when starting the power interchange device, equipment costs and maintenance costs of the starting rotating machine are not required. In addition, the loss during operation is reduced, and the shaft length of the rotating part is shortened, so that the stability of the shaft system is improved.

In each of the first to thirteenth embodiments, when the primary winding and the secondary winding of the first induction machine are connected to the second system and the first system, respectively, A similar effect can be expected when the power supply of the power converter is taken from the first system or a system combining the two.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a power interchange device according to a first embodiment of the present invention.

FIG. 2 is a system configuration diagram of a power interchange device according to a second embodiment of the present invention.

FIG. 3 is a system configuration diagram of a power interchange device according to a third embodiment of the present invention.

FIG. 4 is a system configuration diagram of a power interchange device according to a fourth embodiment of the present invention.

FIG. 5 is a system configuration diagram of a power interchange device according to a fifth embodiment of the present invention.

FIG. 6 is a system configuration diagram of a power interchange device according to a sixth embodiment of the present invention.

FIG. 7 is a system configuration diagram of a power interchange device according to a seventh embodiment of the present invention.

FIG. 8 is a system configuration diagram of a power interchange device according to an eighth embodiment of the present invention.

FIG. 9 is a system configuration diagram of a power interchange device according to a ninth embodiment of the present invention.

FIG. 10 is a system configuration diagram of a power interchange device according to a tenth embodiment of the present invention.

FIG. 11 is a system configuration diagram of a power interchange device according to an eleventh embodiment of the present invention.

FIG. 12 is a system configuration diagram of a power interchange device according to a twelfth embodiment of the present invention.

FIG. 13 is a system configuration diagram of a power interchange device according to a twelfth embodiment of the present invention.

FIG. 14 is a system configuration diagram of a conventional power interchange device.

[Explanation of symbols]

 1: First system 2: Second system 301: Power interchanger 3: First induction machine 4: Second induction machine switch 5: Static power converter 6, 7, 8, 9: Switch 10: Static starter 11: Start switch 14: Static starter 16: Starting resistor

Claims (4)

[Claims] An electric power system is provided between two opposing power systems having different frequencies. The primary windings and the secondary windings are connected in parallel and connected to the opposing power systems. , A first and a second winding type induction motor having a rotor coaxially coupled thereto, and a stationary power converter inserted between a secondary winding of one of the induction motors and a power system. In a power interchange device in which the power flow between opposing power systems is controlled by controlling the rotation speed of an induction motor by a static power converter, one of the induction machines is used to start the power interchange device. In a state where the secondary winding or the secondary winding is short-circuited in three phases, a variable frequency current is supplied from the static power converter to the secondary winding or the primary winding of the machine, thereby rotating the rotor near the synchronous speed. Speed, and then the static power converter Thus by controlling the rotational speed, the starting method of the power interchange system, characterized in that parallel the first induction machine and the second induction machine by synchronizing to the grid. 2. A power supply provided between two opposing power systems having different frequencies, wherein the primary windings and the secondary windings are connected in parallel and then connected to the opposing power systems. , A first and a second winding type induction motor having a rotor coaxially coupled thereto, and a stationary power converter inserted between a secondary winding of one of the induction motors and a power system. In a power interchange device in which the power flow between opposing power systems is controlled by controlling the rotation speed of an induction motor by a static power converter, one of the induction machines is used to start the power interchange device. With DC or low frequency current applied from the static power converter to the secondary winding or secondary winding,
By passing a variable-frequency current from the stationary starter provided separately to the secondary winding or the primary winding, the rotating unit is accelerated to near the synchronous speed, and then the rotational speed is controlled by the static power converter. And the first induction machine and the second induction machine are synchronized.
A method for starting an electric power interchanger, wherein two induction machines are arranged in parallel with a system. 3. A power supply provided between two opposing power systems having different frequencies, wherein the primary windings and the secondary windings are connected in parallel and then connected to the opposing power systems. , A first and a second winding type induction motor having a rotor coaxially coupled thereto, and a stationary power converter inserted between a secondary winding of one of the induction motors and a power system. In a power interchange device in which the power flow between opposing power systems is controlled by controlling the rotation speed of an induction motor by a static power converter, when starting the power interchange device, one of the induction motors 2 In the state where the next winding is short-circuited in three phases via the starting resistor,
Apply a reduced voltage below the rated voltage through the transformer to the primary winding of the machine and start it. After the rotation speed rises, disconnect the transformer and switch to the rated voltage to speed up the rotating part to near the synchronous speed Then, the rotational speed of the rotor is adjusted by passing a variable frequency current from the static power converter to the secondary winding or the primary winding, and the first induction motor and the second induction motor are synchronized. A method for starting an electric power interchange device, comprising: setting an induction machine in parallel with a system. 4. A power supply provided between two opposing power systems having different frequencies, wherein the primary windings and the secondary windings are connected in parallel and then connected to the opposing power systems. , A first and a second winding type induction motor having a rotor coaxially coupled thereto, and a stationary power converter inserted between a secondary winding of one of the induction motors and a power system. In a power interchange device that controls the power flow between opposing power systems by controlling the rotation speed of an induction motor by a stationary power converter, a secondary power source of a first induction machine is used to start the power interchange device. In a state where the windings are short-circuited via the starting resistor, a voltage is applied to the primary winding of the first induction machine to start the motor, and the rotating part is accelerated to near the synchronous speed. The rotation speed is controlled by the power converter, and the first Method of starting power interchange system, characterized in that the induction machine and a second induction motor parallel to the system.