JPH099696A - Variable speed phase modifying motor-generator - Google Patents

Abstract

PURPOSE: To improve the starting control of a variable speed phase modifying motor-generator secondarily excited by a power converter. CONSTITUTION: The variable speed phase modifying motor-generator has a wound-rotor type AC machine 3 having a primary winding 4 and a secondary winding 5 connected to an AC system, and a cycloconverter 6 connected to the secondary winding to AC-excite the winding 5, and comprises exciting means 200 at the time of starting to DC-excite or AC-excite the one winding of the machine 3 by a low AC voltage at the time of starting, wherein the other winding of the machine 3 is driven by the cycloconverter 6 at the time of starting, and a rectangular wave drive mode and a sine wave drive mode are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a variable speed phase-change motor generator using a wire wound type AC machine, such as a variable speed generator, a variable phase generator, a variable speed electric motor and a variable speed phase adjuster.

[0002]

2. Description of the Related Art FIG. 11 is a circuit diagram showing an example of a conventional variable speed phase-controlled motor generator. In the figure, 1 is an AC system, 2 is a main transformer, 3 is a primary winding 4 and a secondary winding. A winding type AC machine having a wire 5 and its primary winding 4 connected to the secondary winding of the main transformer 2 via a switch 25a; 6 is a rectifying transformer 7;
a cycloconverter 100, which is composed of a to 7c and rectifying circuits 10a to 10l, and is connected to the secondary winding 5 of the winding type AC machine 3 is a starter. Note that 8a to 8c and 9a to 9f are the primary winding and secondary winding of the rectifying transformers 7a to 7c, respectively.

Next, the operation will be described. At the time of start-up, the start-up device 100, for example, an auxiliary electric motor accelerates the winding type AC machine 3 to near the synchronous speed, and then the primary winding 4 is connected to the AC system, and the cycloconverter 6 starts exciting the secondary winding 5. By setting the excitation frequency or the excitation angle to the slip frequency or the slip angle, the power generation operation, the electric operation, the phase adjustment in the range of ± maximum slip frequency (for example, about 3 to 50% of the AC system frequency) with the synchronous speed as the shift center. Operate (reactive power adjustment operation) or their integrated control operation. That is, there is a feature in that the operation is performed within a partial speed range by controlling the excitation of the slip.

[0004]

Since the conventional variable speed phase-modulated motor generator is constructed as described above, the starting device 100 is required and the starting auxiliary electric motor or the thyristor starting device is used. . The thyristor starting device is provided with a thyristor converter and a thyristor inverter in addition to the exciting cycloconverter, and starts up with a generator as an electric motor. The reason why the starting device 100 is separately required is that the excitation cycloconverter can operate only up to a frequency corresponding to a slip frequency lower than the frequency of the AC system. As described above, the secondary excitation method using the excitation cycloconverter has a problem that the starting device 100 is separately required.

In order to solve this problem, self
In some cases, the secondary excitation method using a self-excited inverter using an FF type element is adopted. In this case, the primary winding 4 is short-circuited, the secondary winding 5 is driven by the self-excited inverter, and the winding AC machine 3 can be accelerated as an induction motor to a speed close to the synchronous speed. However, similarly to the secondary excitation method using the cycloconverter, there is a problem that the operation control at the time of start-up and the secondary excitation operation control after becoming close to the synchronous speed are discontinuous.

The present invention has been made to solve the above problems, and an object thereof is to improve the starting control of a variable speed phase-controlled motor generator which is secondarily excited by a power converter.
A first object is to realize operation at a high frequency required at startup without damaging the excitation waveform during normal operation.

A second object is to realize a dual function at the time of starting the exciting cycloconverter during normal operation and to start the wire-wound AC machine as a non-commutator motor.

A third object of the present invention is to realize dual use at the time of starting the exciting AC / AC power converter during normal operation, and to start the wire-wound AC machine as a stationary selbyus or a kramer.

Cycloconverter AC to AC power converter
The fourth purpose is to configure the

A fifth object of the present invention is to realize a good sinusoidal wave excitation operation and a good rectangular wave operation at startup with a simple cycloconverter having a small number of arms.

A sixth object of the present invention is to realize, in the cycloconverter, good sine wave excitation operation at normal times and good operation at startup.

A seventh object is to improve the characteristics of the cycloconverter.

An eighth object is to improve the operating characteristics of the cycloconverter at startup.

A ninth object is to improve the characteristics of the cycloconverter during sinusoidal operation.

[0015]

According to a first aspect of the present invention, there is provided a variable speed phase-modulated motor generator comprising: a winding type AC machine having a primary winding and a secondary winding connected to an AC system. , In a variable speed phase-controlled motor generator equipped with a cycloconverter connected to the secondary winding to excite the secondary winding with an alternating current, in which one winding of the winding type AC machine is subjected to direct current excitation or An exciter that excites alternating current at the alternating current system frequency is provided, and the other winding of the winding type AC machine is driven by the cycloconverter at the time of starting, and the cycloconverter includes the current of the control rectifying arm constituting the same. ,
A direct current reactor is provided on the lines in which currents flow in the same direction.

According to a second aspect of the present invention, there is provided a variable-speed phase-modulated motor generator, which is a winding type AC machine having a primary winding and a secondary winding connected to an AC system, and the secondary winding. In a variable speed phase-modulated motor generator equipped with a cycloconverter connected to and exciting the secondary winding with an alternating current, a direct-current excitation means for direct-current exciting one winding of the winding-type alternating current machine at startup is provided, An energization control unit that drives the other winding of the wire-wound AC machine at the time of startup and controls energization of the cycloconverter in synchronization with the magnetic flux linkage number of the other winding or its corresponding amount. It is equipped with.

According to a third aspect of the present invention, there is provided a variable-speed phase-modulated motor generator, which is a winding-type AC machine having a primary winding and a secondary winding connected to an AC system, and the secondary winding. In a variable speed phase-controlled motor generator equipped with an AC to AC power converter that is connected to the AC to excite the secondary winding with AC, one winding of the winding type AC machine has a low voltage and the AC Equipped with low-voltage AC excitation means for exciting with AC voltage of system frequency,
At the time of starting, the other winding of the winding type AC machine is driven by the AC to AC power converter, and the AC to AC power conversion is performed in synchronization with the number of magnetic flux linkages of the other winding or its corresponding amount. An energization control means for energizing the container is provided.

According to a fourth aspect of the present invention, there is provided a variable speed phase-modulated motor generator, in which an AC / AC power converter is composed of a cycloconverter.

According to a fifth aspect of the present invention, there is provided a variable speed phase-modulated motor generator, wherein the cycloconverter is composed of 18 control rectification arms, and the AC power supply frequency of the cycloconverter is higher than the frequency of the AC system. To do.

According to a sixth aspect of the present invention, there is provided a variable speed phase-controlled motor generator, wherein the cycloconverter has the following (1) to
(1) A first-type bridge rectifier circuit comprising a plurality of control rectification arms connected in a bridge between a first-type DC terminal and a first-type AC terminal. ) A second-kind bridge rectifier circuit comprising a plurality of the first-kind bridge rectifier circuits connected by bridging between a second-kind DC terminal and a second-kind AC terminal; A first alternating current system connected to an alternating current terminal, (4) means for connecting between the second type direct current terminals, and the other side of the winding type alternating current machine to the second type alternating current terminal at the time of starting. To connect the windings.

According to a seventh aspect of the invention, there is provided a variable speed phase-modulated motor generator according to the sixth aspect, further comprising a reactor for connecting the second type DC terminals.

According to an eighth aspect of the invention, there is provided a variable speed phase-modulated motor generator according to the sixth aspect, further comprising a rectifying device for connecting between the second type DC terminals.

According to a ninth aspect of the present invention, there is provided a variable speed phase-modulated motor generator according to the seventh or eighth aspect, further comprising means for short-circuiting the second type DC terminals.

[0024]

The variable-speed phase-modulated motor generator according to the invention described in claim 1 operates up to a high frequency in the rectangular wave operation mode, and operates in the sine wave operation mode with a low frequency but little waveform distortion. It has the effect of smoothly starting from a low speed state.

In the variable-speed phase-modulated motor generator according to the invention as defined in claim 2, the winding type AC machine operates as a non-commutator motor, thereby having an action of starting from a low speed state.

The variable-speed phase-modulated motor generator according to the invention of claim 3 has the action of starting from a low speed state by operating the above-mentioned wire-wound AC machine as a stationary cellubius or a Kramer, and from start to normal operation. The transition to is extremely smooth.

In the variable speed phase-modulated motor generator according to the invention as defined in claim 4, since the AC-AC power converter is constituted by a cycloconverter, it is easy to increase the capacity and is excellent in starting. It is possible to realize simple rectangular wave operation.

In the variable-speed phase-modulated motor generator according to the invention of claim 5, the cycloconverter is constituted by 18 control rectification arms, and the AC power supply frequency of the cycloconverter is set higher than the frequency of the AC system. This has the effect of reducing the exciting current pulsation in the sine wave operation mode despite the small number of arms.

The variable speed phase-controlled motor generator according to the invention of claim 6 has a separately excited inverter converter function and a cycloconverter function.

According to a seventh aspect of the present invention, there is provided a variable-speed phase-modulated motor generator, wherein the reactor has a DC current smoothing function in the separately excited inverter converter operation, a circulating current smoothing operation in the cycloconverter operation, or a non-circulation cycloconverter. In operation, it has a function of limiting the short-circuit current from the AC power supply.

In the variable-speed phase-adjustment motor generator according to the present invention as defined in claim 8, by strengthening the function of the separately excited inverter converter, the range of operation by this function is expanded.

The variable-speed phase-controlled motor generator according to the invention of claim 9 functions as a conventional cycloconverter when the DC terminals of the thyristor converter are short-circuited.

[0033]

【Example】

Embodiment 1 FIG. FIG. 1 is a circuit diagram of a variable speed phase-modulated motor generator according to an embodiment of the present invention. In the figure, 11 is a rotating body such as a pump, turbine, turbine, prime mover, flywheel, and 12 is a winding AC machine. An excitation generator that is mechanically coupled to the motor and also operates electrically. Reference numeral 13 is an excitation motor generator that can be reversibly converted by being connected to an AC system through a switch. For example, the excitation motor generator 13 can also be operated electrically. It is composed of a motor 14 that can be operated, a generator 15 that can also electrically drive the exciting motor generator 13, and a rotary inertia body 16 of the exciting motor generator 13.

Reference numeral 17 is an alternating current power source switching means for the cycloconverter 6, 18 is a rotation detecting means of the winding type AC machine 3, 19 is a slip output means, 20 is a magnetic pole position information means, and 21a is an AC phase of the AC system 1. Information means, 21b
Is an AC phase information means of the wire-wound AC machine 3, 21 c is a phase information means of the cycloconverter 6 on the AC power supply system side, 2
Reference numeral 2a is a switching means for switching between the magnetic pole position information means 20 and the alternating current phase information means 21b according to the rotation speed of the winding AC machine 3, 23a and 23b are current detecting means capable of detecting even direct current, and 24 is a current detecting means. 25a to 25d are switching means such as a circuit breaker, an electromagnetic contactor, and a disconnector, and 26 is a transformer.

Reference numeral 200 denotes a DC excitation means, which is composed of, for example, a DC excitation rectifier 27, a DC excitation rectifier firing phase control means 28, a DC excitation current control means 29, and a DC excitation current command means 30. Reference numeral 31 is a representative value output means such as an absolute value, a peak value, an average value or an effective value, and 50 is an energization control means.

Although power and energy are converted between the rotating body 11 and the winding type AC machine 3, when the secondary excitation device 6 is a cycloconverter, the operation cannot be performed at the frequency of the AC system 1. Moreover, since the secondary excitation device 6 has only a voltage capacity corresponding to the operation within the range of ± 3 to 50% of slip around the synchronous speed, another starting device is required at the time of starting.

However, according to the configuration of the first embodiment,
At the time of start-up, the switching means 17 can be connected to the contact point a or the contact point b so that the cycloconverter 6 can be powered from the AC system 1 or the motor generator 13.

On the other hand, the switches 25b and 25c are turned on to operate the DC exciting means 200 to DC excite the primary winding 4. At this time, the direct-current excitation is made lower than the rated magnetic flux in advance, or, though not shown, it is inversely reduced as the speed increases. Besides, a representative value output means for detecting a secondary winding current corresponding to an armature or a cycloconverter input current proportional to the secondary winding current by the current detecting means 24 and outputting a representative value thereof, for example, an average value, an effective value, and a peak value. The DC exciting current command I _f ^* is changed according to the output of 31.

Further, the magnetic pole position information βm, which is the output of the magnetic pole position information means 20, is output in a stopped state or at an extremely low speed in order to give a current of an appropriate phase to the secondary winding 5 serving as an armature.
The AC phase information βv which is the output of the phase information means 21b is used at a speed equal to or higher than the speed at which a detectable internal electromotive force appears in the secondary winding. For this reason, the switching means 2 according to the speed
2a, magnetic pole position information means 20 and AC phase information means 2
1b is switched to give the phase reference βs of the current passing through the secondary winding 5. On the other hand, the phase reference .alpha.s for the power supply of the cycloconverter is given from the AC phase information means 21c, for example, the voltage transformer or the flux linkage number detecting means (for integrating the output of the voltage transformer).

The energization control means 50 has a phase reference βs of current flowing through the secondary winding 5 and a slip angle (phase angle of slip frequency) θ.
s, the phase reference αs for the power supply of the cycloconverter, and the detection output of the current detection means 23a are input, and the number of magnetic flux linkages or its corresponding amount (electromotive force, terminal voltage, integrated amount “flux linkage number”, magnetic flux axis). Energization control of the cycloconverter is performed in synchronism with the rotation angle of the.

By the above method, the winding type AC machine 3 is started as a commutatorless motor and accelerated. When the speed reaches or exceeds the lower limit of the normal operation speed, for example, near the synchronous speed of the AC system, the operation control of the cycloconverter 6 is stopped and the switches 25b and 25c are opened.

Next, the phase reference β as a commutatorless motor
Instead of s, control is performed by switching to control by a slip angle (phase angle of slip frequency) θs, and the switch 25a is turned on. As a result, an electromotive force of the slip frequency and an interlinkage magnetic flux appear in the secondary winding 5, so that energization of the cycloconverter is started in accordance with this phase. That is, the normal secondary excitation operation is started.

The slip angle (phase angle of slip frequency) θs
When the number of pole pairs of the winding AC machine 3 is p and the initial reference value determined by the device configuration is θ ₀ , θs = (θ ₀ + θe−pθ) from the output θe of the phase information means of the AC system and the rotation angle θr.
r) is obtained by the slip output means 19.

The power source of the cycloconverter 6 at the time of startup can be taken from the AC system 1 via the main transformer 2 or the motor generator 13. The power source of the dice converter during normal operation after startup can also be obtained from the excitation generator 12. Excitation generator 12 and motor generator 1
3 has a feature that it can supply an alternating current of a frequency convenient to the cycloconverter 6, that is, a higher frequency than the alternating current system. In addition, there is also a feature that a stable voltage can be supplied even in the event of a power failure or voltage drop in the AC system 1.

As can be understood from the above description, in the first embodiment, there is no need for a separate starting device, and it is possible to start as a commutatorless motor simply by providing the DC exciting means 200 with a small voltage capacity. is there. Therefore, there is an effect that the means for starting becomes economical.

Example 2. FIG. 2 is a circuit diagram showing another embodiment of the present invention. The same parts as those of the first embodiment shown in FIG. In FIG. 2, reference numeral 300 is an AC low voltage applying means (AC low voltage primary exciting means), which is constituted by, for example, a tap switching type auxiliary transformer 26 and a switch 25b.

In the structure of the second embodiment, the switch 25b is turned on when the switch 25a is opened at the time of start-up.
The first lowest AC voltage is applied to the primary winding 4. At this time, a secondary voltage when the slippage is 1 appears in the secondary winding 5, and a low voltage commensurate with the input voltage is applied to the terminals U, V, W of the cycloconverter 6. The secondary output is converted by the cycloconverter 6 into electric power corresponding to the voltage of the AC power supply terminals R, S, T and sent to the AC system 1. That is, the slip power is regenerated to the AC system.

The regeneration destination may be any one of the AC system 1 and the excitation motor generator 13 via the excitation generator (motor operation) 12 and the main transformer 2. At this time, if the secondary electric power is recovered to the excitation generator (motor operation) 12, the Kramer system is used and a large starting torque is obtained. If secondary power is recovered to the AC system 1 or the excitation motor generator 13 via the main transformer 2, the SELVIUS method is used.

Further, since the secondary frequency at the time of start-up starts from the AC system frequency, the cycloconverter 6 is set to the rectangular wave operation or the rectification mode of the secondary winding output. This operation mode signal Sw is switching means 22 according to the speed.
b, which switches the operation mode of the cycloconverter 6. However, slip angle (slip phase) θs
It goes without saying that is obtained from the slip output means 19.

If the speed further increases, the secondary winding 5
Since the slip frequency voltage of the switch decreases, the switching means 3
01 can switch the output voltage of the tap switching transformer 26 to the higher side. As a result, the secondary winding voltage rises and the number of flux linkages of the winding AC machine 3 increases, so that the acceleration torque can be increased. The switching means 301 sends a switching signal according to the speed and the slip frequency based on the rotation angle θr output from the rotation detection means 18, the slip θs output from the slip output means 19, the output voltage of the secondary winding, and the like. Output.

Next, when the speed is accelerated to near the synchronous speed, the switch 25b is opened and the switch 25a is turned on to apply the rated voltage to the primary winding 4. Along with this, the switching means 22b corresponding to the speed is switched to the sine wave operation mode to shift to the normal secondary excitation operation.

Further, an inverter converter 6'shown in FIG. 3 can be used in place of the cycloconverter 6 described above. When this inverter / converter 6'is used, the inverter 61b is operated in the converter mode (rectification mode) and the converter 61a is operated in the inverter mode (regeneration mode) at the time of startup. If the secondary voltage decreases as the speed increases, the inverter 61b is switched to PW.
Operate M and adjust to a low input voltage. Thereby, the low voltage can be converted into the high DC voltage. The converter 61a can receive the above-mentioned high DC voltage and can always regenerate electric power by slipping to a high AC voltage. In this document, the cycloconverter 6 and the inverter converter 6'are collectively referred to as an AC / AC power converter.

As described above, according to the second embodiment, since the operation can be performed by the Servius method or the Kramer method both at the time of starting and at the time of normal operation, there is a feature that the transition from the start operation to the normal operation can be made smoothly. Further, as compared with the first embodiment, the AC low voltage applying means 300, which is simpler than the DC exciting means 200, is advantageous.

Embodiment 3 FIG. FIG. 4 is a circuit diagram showing the details of the cycloconverter 6, and in FIG. 4, 32 is a control rectifying element, 33 (33 _UP , 33 _VP , 33 _WP , 3 _WP) .
3 _UN , 33 _VN , 33 _WN ) are magnetic coupling reactors, R,
S, T, U, N and W are input / output AC terminals.

The magnetic coupling reactor 33 may magnetically couple all the windings, magnetically couple 33 _UP , 33 _VP and 33 _WP, and magnetically couple 33 _UN , 33 _VN and 33 _WN into two groups. The magnetic coupling may be performed separately. These reactors have a current smoothing effect in square wave operation when high frequencies are required. Further, when the sine wave operation is performed at a low slip frequency, the circulating current can be smoothed, and the current can be limited against the AC power supply short circuit phenomenon via the controlled rectifying element. The action of these reactors 33 is the same in the embodiments described later.

The cycloconverter 6 having the structure shown in the third embodiment of FIG. 4 has an exciting generator 12 or an exciting motor generator 13 capable of producing a frequency higher than that of the AC system 1.
It is suitable to use in combination with. These have the advantage that good sine wave current can be obtained with a small number of arms.

Example 4. FIG. 5 is a circuit diagram showing other details of the cycloconverter 6 used in the present invention. In FIG. 5, 10a to 10h are bridge type rectifier circuits. Here, each of 10a to 10f is a first type bridge rectifier circuit, 401 to 403 is a second type bridge rectifier circuit, I _DC is a first type DC terminal, I _AC is a first type AC terminal, and II _DC is A second type DC terminal, II _AC is a second type AC terminal, III is a first AC system, and 404 is a means for connecting between the second type DC terminals.

The fourth embodiment can be operated in a rectangular wave mode in which commutation is performed by the internal electromotive force of the wire-wound AC machine 3 at startup. An equivalent circuit in the commutation operation mode by this internal electromotive force is shown in FIG. That is, when the switch 25d is opened and the AC voltage of the bridge rectifying circuits 10a to 10f is set to zero, the rectifying elements in the bridge rectifying circuits 10a to 10f form a rectifying arm connected in series and parallel. On the other hand, switch 25e
Is turned on, the bridge rectification circuits 10g and 10h are utilized. As a result, a separately excited commutation back-to-back reversible power conversion circuit is formed.

Now, when the current flows as shown by the arrow in the figure, if the electromotive force of the wire-wound AC machine 3 is like the +-sign,
The current i ₁ decreases and the current i ₂ increases to perform commutation, and finally the bridge rectifier circuit 10e is reverse-biased and extinguished. Hereinafter, it is understood that the commutation is performed in the same manner to operate as a separately excited converter / inverter. Therefore, it can be started as a non-commutator electric motor in FIG. 1 and as a SELVIUS method or a Kramer method.

Next, when the speed at which the normal secondary excitation operation is possible is reached, the switch 25e is opened and the switches 25f and 25d are opened.
Input. As a result, the bridge rectifier circuits 10a and 1
0b forms an antiparallel circuit, an antiparallel rectification circuit is similarly formed about other phases, and the Y-connected cycloconverter is formed. At this time, the node short-circuited by the switch 25f becomes the neutral point. At the time of short circuit by the switch 25f, the bridge rectifier circuit 10 as shown by the dotted line 41.
If only g and 10h are short-circuited and the reactor 33d is not short-circuited, the reactor 33d acts as a circulating current type cycloconverter operation reactor or a reactor for suppressing short-circuit current between AC terminals via a control rectifying element.

Furthermore, in order to improve the waveform during the operation of the cycloconverter, it can be used in combination with the excitation generator 12 or the motor generator 13 that can output a frequency higher than that of the AC system 1.

As described above, the fourth embodiment realizes both the separately excited inverter / converter operation in the rectangular wave operation mode and the cycloconverter operation in the sine wave operation mode.
The winding type AC machine 5 has a feature that it can be started and a normal operation can be realized.

Example 5. FIG. 7 is a circuit diagram showing other details of the cycloconverter 6, and in FIG.
a to 10n are bridge type rectifier circuits.

This figure shows that in the fourth embodiment of FIG.
One rectifier arm is configured by two bridge rectifier circuits connected in series, and when the separately excited converter / inverter is operating, the number of rectifier elements in the bridge rectifier circuit on the right side in FIG. The circuit when the container 25f is closed corresponds to FIG. 11 of the conventional example. Therefore, there is a feature that a good waveform can be obtained even in the cycloconverter operation in an AC system having a relatively low frequency.

Example 6. FIG. 8 is a circuit diagram showing still another detail of the cycloconverter 6, in which the auxiliary transformer 7d and the bridge rectification circuit 10 in the fourth embodiment of FIG.
g and 10h are omitted.

In the sixth embodiment, the cycloconverter itself is commutated by the internal electromotive force of the secondary winding 5 to start when the switch 25d is turned on. When the motor is started as a non-commutator motor, DC excitation is applied to the primary winding, and another excited commutation is performed by the internal electromotive force appearing in the secondary winding, which is an armature, and a rectangular wave current is supplied to the secondary winding. In the case of starting by the SELVIUS method or the Kramer method, a low AC voltage is applied to the primary winding, and another internal commutation is generated by the internal electromotive force of the secondary winding that appears at this time. At this time, the slip power is recovered and regenerated to the AC power supply system via the transformer 7a.

FIG. 9 shows a commutation operation explanatory diagram at the time of commutation operation by the internal electromotive force. AC power supply voltage e ₁ , e ₂ , e ₃
However, if the power source voltage of the same voltage as e ₁ = e ₂ is given from the transformers 9a to 9f, the combined voltage of the commutation loop is (e ₁ + e ₅ −e ₂₎ due to the internal electromotive force e _5. ) = E ₅
Becomes Therefore, when the current i ₁ decreases and the current i ₂ increases and i ₂ = i ₃ = I, the bridge rectifier circuit 1
A reverse bias voltage is applied to the controlled rectifying element of 0e to extinguish the controlled rectifying element. Hereinafter, the same operation is repeated. On the other hand, the commutation operation with respect to the power source is conventionally performed in each bridge rectification circuit.

After starting, the reactor 33d is connected to the switch 25f.
If it is short-circuited with, it becomes a normal cycloconverter. Even if the reactor 33d is left without the switch 25f,
It acts as a reactor for a circulating current type cycloconverter by suppressing current when a power supply is short-circuited via a controlled rectifying element.

As described above, in this embodiment, as compared with the fourth embodiment of FIG. 5, the starting rectifier circuits 10g and 10h and the auxiliary transformer 7 are used.
There is a feature that d can be omitted.

Example 7. FIG. 10 shows the cycloconverter.
FIG. 8 is a circuit diagram showing still another detailed example of the data inputting device 6, in which the auxiliary transformer 7d and the rectifying circuits 10m and 10n of the example 5 shown in FIG. 7 are omitted.

The seventh embodiment is obtained by increasing the number of bridge rectifier circuits in series in the sixth embodiment shown in FIG.
It is configured by two bridge rectification circuits in which one rectification arm is connected in series. When the separately-excited converter / inverter is operating, the serial number of the control rectifying element and the power supply in the bridge rectifying circuit on the right side in FIG. 9 is doubled, and the equivalent circuit when the switch 25f is closed corresponds to FIG. 11 of the conventional example. To do. Therefore, there is a feature that a good waveform can be obtained even in the cycloconverter operation in an AC system having a relatively low frequency.

The reactor 33 in the above fourth to seventh embodiments.
When d is provided, the reactor 33a inserted in each phase
~ 33c can be omitted. That is, there is a feature that the reactor for suppressing the current when the power supply is short-circuited via the controlled rectifying element and the reactor for the circulating current type cycloconverter can be integrated.

[0073]

As described above, according to the first aspect of the present invention, the sine wave operation mode and the rectangular wave operation mode are provided. Therefore, the excitation waveform during normal operation is not damaged, and at the time of start-up. There is an effect that operation at a required high frequency can be realized.

According to the invention described in claim 2, since the winding type AC machine is configured to be started as a non-commutator motor,
The effect is that the excitation cycloconverter during normal operation can also be used during startup.

According to the third aspect of the present invention, since the wire-wound AC machine is configured to be started up as a SELVIUS system or a Kramer system, both the startup and the normal operation can be performed by the SELVIUS system or the Kremer system. The transition from startup to normal operation becomes extremely smooth.

According to the invention described in claim 4, since the AC-AC power converter is constituted by the cycloconverter, there is an effect that the capacity can be easily increased and good rectangular wave operation at the time of starting can be realized. is there.

According to the invention described in claim 5, since the cycloconverter is constituted by 18 control rectification arms and the AC power supply frequency of this cycloconverter is set higher than the frequency of the AC system, the number of arms can be simplified. With such a cycloconverter, there is an effect that a good sine wave excitation operation and a good rectangular wave operation at start-up can be realized.

According to the invention as set forth in claim 6, since it has a configuration having a separately excited inverter converter action and a cycloconverter action, the cycloconverter performs good sine wave excitation operation during normal operation and good operation during startup. There is an effect that can be realized.

According to the invention described in claim 7, since the reactor is connected between the DC terminals of the cycloconverter, there is an effect that the characteristics of the cycloconverter are improved in the invention described in claim 6.

According to the invention described in claim 8, since the rectifier circuit is connected between the DC terminals of the cycloconverter, the operation characteristics at the time of starting of the cycloconverter of the invention described in claim 6 can be improved. There is an effect that can be done.

According to the invention of claim 9, since the means for short-circuiting the DC terminals of the cycloconverter is provided, the characteristics of the cycloconverter of the inventions of claims 7 and 8 during sine wave operation. Has the effect of being improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a variable speed phase-controlled motor generator according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a variable speed phase-controlled motor generator according to another embodiment of the present invention.

FIG. 3 is a circuit diagram of an AC-AC power converter used in the device of the present invention.

FIG. 4 is a circuit diagram showing an embodiment of a cycloconverter used in the device of the present invention.

FIG. 5 is a circuit diagram showing an embodiment of a cycloconverter used in the device of the present invention.

FIG. 6 is an equivalent circuit diagram related to commutation due to the internal electromotive force of FIG.

FIG. 7 is a circuit diagram showing an embodiment of a cycloconverter used in the device of the present invention.

FIG. 8 is a circuit diagram showing an embodiment of a cycloconverter used in the device of the present invention.

FIG. 9 is an explanatory diagram of commutation operation by the internal electromotive force of FIG.

FIG. 10 is a circuit diagram showing an embodiment of a cycloconverter used in the device of the present invention.

FIG. 11 is a circuit diagram showing a conventional variable speed phase-controlled motor generator.

[Explanation of symbols]

3 winding type AC machine, 4 winding type AC machine primary winding, 5
Secondary winding of winding type AC machine, 6 power converter, 200 DC excitation means, 300 low voltage AC excitation means, 10 (1
0a, 10b, 10c, 10d, 10e, 10f, 10
g, 10h, 10i, 10j, 10k, 10l, 10
m, 10n) Bridge rectifier circuit, 33 (33a, 33)
b, 33c, 33d) Reactor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Shiroji 1-2-1, Wadazakicho, Hyogo-ku, Kobe Sanrishi Electric Co., Ltd. Kobe Works

Claims (9)

[Claims] 1. A winding-type AC machine having a primary winding and a secondary winding connected to an AC system, and a cycloconverter connected to the secondary winding and AC-exciting the secondary winding. In a variable-speed phase-modulated motor generator equipped with, at the time of startup, one winding of the winding type AC machine is provided with an exciting means for performing DC excitation or AC excitation at the AC system frequency, and at the time of starting, the winding type AC machine The other winding is driven by the cycloconverter, and the cycloconverter is provided with a DC reactor in a line through which a current flows in the same direction among the control rectifying arms constituting the cycloconverter, and a rectangular wave operation mode and a sine wave operation mode are provided. A variable-speed phase-adjustment motor generator that is equipped with. 2. A winding type AC machine having a primary winding and a secondary winding connected to an AC system, and a cycloconverter connected to the secondary winding and AC-exciting the secondary winding. In a variable speed phase-modulated motor generator comprising: a DC exciting means for DC-exciting one winding of the wire-wound AC machine at startup, and the other winding of the wire-wound AC machine at startup. And a current-carrying control means for controlling current-carrying of the cycloconverter in synchronism with the number of magnetic flux linkages of the other winding or its corresponding amount, and starts the winding-type AC machine as a non-commutator motor. A variable-speed phase-controlled motor generator that is characterized. 3. A winding type AC machine having a primary winding and a secondary winding connected to an AC system, and AC AC power which is connected to the secondary winding and AC excites the secondary winding. In a variable-speed phase-modulated motor generator including a converter, a low-voltage AC excitation means for exciting one winding of the winding-type AC machine at a low voltage and an AC voltage of the AC system frequency at startup, and at the time of startup. The other winding of the winding type AC machine is driven by the AC / AC power converter, and the AC / AC power converter is energized in synchronization with the number of magnetic flux linkages of the other winding or its corresponding amount. A variable speed phase-controlled motor generator, comprising: a current control unit for controlling the winding type AC machine, and activating the winding type AC machine as a static cellu system or a Kramer system. 4. The variable speed phase-controlled motor generator according to claim 3, wherein the AC-AC power converter is a cycloconverter. 5. The cycloconverter is configured by 18 control rectification arms, and the AC power supply frequency of the cycloconverter is set higher than the frequency of the AC system. The variable speed phase-controlled motor generator according to Item 1. 6. The cycloconverter includes the following (1) to
(1) A first-type bridge rectifier circuit comprising a plurality of control rectification arms connected in a bridge between a first-type DC terminal and a first-type AC terminal, ) A second-kind bridge rectifier circuit composed of a plurality of the first-kind bridge rectifier circuits connected by bridging between a second-kind DC terminal and a second-kind AC terminal, (3) A first alternating current system connected to an alternating current terminal, (4) means for connecting between the second type direct current terminals, and the other of the winding type alternating current machine to the second type alternating current terminal at the time of starting The variable speed phase-controlled motor generator according to any one of claims 1, 2 and 4, characterized in that the windings are connected. 7. The variable speed phase-controlled motor generator according to claim 6, further comprising a reactor connecting between the second type DC terminals. 8. The variable speed phase-controlled motor generator according to claim 6, further comprising a rectifier circuit connecting between the second type DC terminals. 9. The variable speed phase-controlled motor generator according to claim 7, further comprising means for short-circuiting the second type DC terminals.