JP3433285B2 - Variable speed generator motor system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable speed generator / motor system, and more particularly to a means for controlling an AC voltage and an active power of a generator / motor which is operated at a variable speed by applying an alternating current having a variable frequency from a secondary side. .

[0002]

2. Description of the Related Art As a conventional technique of this type, for example, as disclosed in Japanese Patent Laid-Open No. 2-146996, a method of operating an active power command value in response to an abnormality detection in an AC power system is known. is there.

[0003]

In the above-mentioned prior art, when the abnormality occurs on the AC power system side, the active power is taken into consideration, but the AC voltage fluctuation is insufficiently considered. In the secondary excitation power generation system, voltage control is performed to increase the AC voltage while the AC voltage is reduced due to an abnormality in the AC system that ends in several cycles of the power supply cycle.
The exciting current on the secondary side rises to the maximum value. As a result, immediately after the abnormality of the AC system is removed, the AC voltage of the generator motor may rise abnormally, and the response of the AC voltage control cannot be sufficiently speeded up.

Further, when attempting to construct a system that stabilizes the system by using such a generator motor and suppresses fluctuation, there is a problem that optimum control cannot be realized due to the restriction of the control response speed.

FIG. 1 is a voltage vector diagram for explaining the operation of the secondary excitation power generation system when an abnormality occurs on the AC power system side. FIG. 1A shows a voltage vector in a normal state. E0 is an induced voltage vector of the generator motor, VG is a generator motor terminal voltage vector, and VL is an AC system voltage vector. ZGI is
ZTI is the voltage drop due to the leakage reactance of the generator motor, and ZTI is the voltage drop due to the leakage reactance due to the main transformer.

FIG. 1B shows a voltage vector in the case where a three-phase short-circuit accident or the like occurs in the AC system and the voltage VL of the AC system drops. When the voltage VL of the AC system decreases due to such an abnormality, the generator motor terminal voltage VG decreases, the flowing current increases, and the voltage drops ZGI and ZTI increase. In general, such a state cannot be left unattended for a long time. Therefore, the power transmission line in which the abnormality has occurred is disconnected, and the AC system voltage V
L is returned to the original state, and returns to the state of FIG.

The AC voltage control system uses a generator motor terminal voltage V
The excitation current on the secondary side of the generator motor is controlled so that G is detected and the voltage VG is kept constant. However, when the control response speed is faster than several cycles of the power supply cycle, the exciting current on the secondary side of the generator motor is increased faster than the abnormality of the AC system is eliminated, and as shown in FIG. 1 (c). Voltage vector. In the state of FIG. 1 (c), the magnitude of the exciting current is increased to the limit value, so the generator motor induced voltage VG
Is the maximum.

FIG. 1 (d) shows that the transmission line in which an abnormality has occurred is cut off and the voltage V
The voltage vector immediately after L returns to the original state is shown. In this state, the induced voltage E0 of the generator motor is high, so that the generator motor terminal voltage VG is high, which is higher by dV than in the normal state.

In the secondary excitation power generation system, FIG.
If the exciting current is increased during the occurrence of an AC system abnormality such as that shown below, the AC system will have a voltage close to zero, so the generator motor will absorb active power to the power system side. / It cannot be discharged, most of the current works as a reactive component, and when the AC voltage control works or the active power control works, the voltage relationship as shown in FIG. turn into.

An object of the present invention is to, when an abnormality occurs in an AC system, suppress the AC voltage or active power from becoming excessive with respect to a normal value immediately after removing the abnormality, and immediately restore the original state. (EN) A variable speed generator-motor system having means for returning.

[0011]

In order to achieve the above object, the present invention provides a generator motor in which one of a rotor winding and a stator winding is connected to an AC power supply system, and power is supplied from an AC power supply. The excitation means for outputting the variable frequency alternating current to the other side of the winding to excite the alternating current, and the AC excitation current from the excitation means by the slip phase detected based on the voltage phase of the rotor of the AC power supply and the generator motor as the excitation component current. A means for converting into a torque component current, an AC voltage control means for determining the command value of the excitation current component based on the detected value of the AC voltage for controlling the AC voltage of the generator motor, and the active power of the generator motor is controlled. For this purpose, active power control means for determining the command value of the torque component current based on the calculated value of the active power, and the excitation component current and torque of the exciter based on the excitation component current command value and the torque component current command value. In the variable speed generator-motor system comprising a current control means for controlling a click component current, an AC system abnormality detecting means for detecting the removal of the abnormality and the abnormality of the AC power supply system provided, when an abnormality occurs in the AC power system Excitation component current holding means for holding the excitation component current command value at the input value immediately before the abnormality detection, and torque component current that holds the torque component current command value at the input value just before the abnormality detection when an abnormality occurs in the AC power system. A holding means is provided to eliminate abnormalities in the AC power supply system.
Excitation current holding means and torque current holding when released
A variable speed generator-motor system is proposed which is provided with a holding release means for releasing the holding function of the means .

In order to achieve the above object, the present invention also provides a generator motor in which one of a rotor winding and a stator winding is connected to an AC power supply system, and a variable frequency generator which is supplied with power from an AC power supply. An exciting means for outputting alternating current to the other side of the winding to excite the alternating current, and an alternating exciting current from the exciting means by the slip phase detected based on the voltage phase of the rotor of the alternating current power supply and the generator motor. To control the AC voltage of the generator motor, and AC voltage control means that includes an integral element for controlling the AC voltage of the generator motor to determine the command value of the exciting current based on the detected value of the AC voltage, and to control the active power of the generator motor. Active power control means for determining the command value of the torque component current based on the calculated value of active power including an integral element in
In a variable speed generator-motor system equipped with a current control means for controlling the excitation current component and the torque component current of the exciter on the basis of the excitation current component command value and the torque component current command value, the AC power supply system abnormality and the elimination of the abnormality are eliminated . An AC voltage error accumulation suppressing means for preventing an input to the AC voltage control means including an integration element of the detected value of the AC voltage when an abnormality occurs in the AC power supply system, and an AC power supply. When an abnormality occurs in the system, an active power error accumulation suppression unit that prevents an input to the active power control unit including an integral element of the calculated value of the active power is provided, and
When the abnormality is removed, it has a means to suppress ac voltage error accumulation.
Cancel the error accumulation suppression function of the effective power error accumulation suppression means
We propose a variable speed generator-motor system with release means .

The AC system abnormality detecting means is configured to obtain a fundamental wave component obtained by an integral operation during the fundamental wave period from the three-phase AC voltage.
It can be used as means for judging the presence / absence of abnormality on the side of the AC power supply system based on the detected amplitude value of the minute .

Solution of holding release means or error accumulation suppression function
The voltage level at which the removing means operates depends on the holding means or the error storage.
It is desirable to have a hysteresis characteristic that is higher than the voltage level at which the product suppression function starts operating .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a variable speed generator-motor system according to the present invention will be described with reference to FIGS.

<< Embodiment 1 >> FIG. 2 is a block diagram showing the control configuration of Embodiment 1 of the variable speed generator-motor system according to the present invention, and FIG. 3 is an AC system abnormality detector in Embodiment 1 of FIG. 18 is a block diagram showing an example of a configuration of 18.
FIG. 4 shows an AC system abnormality detector 1 according to the first embodiment shown in FIG.
8 is a block diagram showing another example of the configuration of FIG.

In the first embodiment, the generator motor 14 is connected to the power system V0 via the main transformer Mtr. In addition, the exciter 15 is connected to the power system V0 via the exciter transformer Etr and the main transformer Mtr, and the exciter 15 generates alternating current of a variable frequency to excite the rotor winding of the generator motor 14 with alternating current. To do. The exciter 15 may use an indirect AC converter that converts an alternating current into a direct current and then converts the direct current into an alternating current having a desired frequency, that is, a conversion device including a forward converter and an inverse converter. A direct AC converter, that is, a cycloconverter, which directly converts AC into AC of a desired frequency without intervention may be used.

The power supply voltage phase detector 9 detects the phase of the power supply voltage. Rotor phase detector 10 of generator motor 14
Detects the phase of the rotor of the generator motor 14. As the rotor phase detector 10, a resolver device or the like that outputs a two-phase sine wave signal having a phase difference of 90 degrees in accordance with the rotational position of the rotor of the generator motor 14 can be used.

The slip phase detector 11 outputs a slip phase based on the phase signal of the power supply voltage detected by the phase detector 9 and the rotor phase signal detected by the phase detector 10.

The current detector 12 is a slip phase detector 11
By using the slip phase detected in step 1, the exciting current from the exciting device 15 is converted into the exciting bidirectional current Id and the torque bidirectional current Iq which are orthogonal biaxial currents of the rotating coordinate system. Excitation current Id
1 determines the generator motor terminal voltage VG of FIG. 1, and the torque component current Iq determines the active power of the generator motor.

The current controller 13 controls the torque component current Id so that the excitation component current Id matches the excitation component current command value Idc.
The exciter 15 is controlled so that q matches the torque current command value Iqc.

The AC voltage detector 7 detects the AC voltage VLa. The AC voltage detection value VLa is the three-phase AC voltage Vu,
In the case of Vv and Vw, the amplitude value of the voltage is detected by Expression 1. The amplitude value of the three-phase alternating current obtained by using Equation 1 is an instantaneous amplitude value. Occurs. On the other hand, if only the positive phase component is detected by using the discrete Fourier transform, the vibration component can be removed.

[0023]

[Equation 1]

Similarly, the three-phase AC voltages are Vu, Vv, Vw.
Assuming that the power supply cycle is T, the power supply frequency is ω, and the number of samplings in the cycle T is n, the AC voltage VLa can be obtained by the mathematical expression 2. When using Equation 2,
Since the harmonic component that is an integral multiple of the power supply frequency is removed, the positive phase component of the AC voltage can be stably obtained.

[0025]

[Equation 2]

The AC voltage controller 8 controls the AC voltage detection value VLa detected by the AC voltage detector 7 so as to match the AC voltage command value Vc. For example, a controller including a proportional-plus-integral element is used to determine the excitation current command value Idc so that the difference between the AC voltage command value Vc and the AC voltage detection value VLa becomes zero.

The active power detector 5 uses the output current of the variable speed generator / motor system and the terminal voltage of the generator / motor 14,
The active power P of the variable speed generator / motor system is detected. The active power P is Va, Vb obtained by the equation 1 and the three-phase current I
Using u, Iv, and Iw, it can be obtained from Ia and Ib obtained by Equation 3. The active power P obtained by Equation 3 is an instantaneous power, and becomes an oscillated detection value when an imbalance occurs in voltage or current.

[0028]

[Equation 3]

On the other hand, Vr, V obtained by the equation 2
i and Ir obtained based on the three-phase currents Iu, Iv, and Iw,
The active power P may be obtained by the equation 4 using Ii. According to Equation 4, the positive phase component of the active power P can be detected,
It is possible to remove the influence of the harmonic component of the positive multiple frequency of the power supply superimposed on the voltage or current and the direct current component, and it is possible to stably detect the active power even during the abnormality of the alternating current system.

[0030]

[Equation 4]

The active power controller 2 controls the active power P detected by the active power detector 5 so as to match the active power command value Pc. For example, the controller including the proportional-plus-integral element is used to determine the torque current command value Iqc so that the difference between the active power command value Pc and the active power P of the variable speed generator-motor system becomes zero.

The AC system abnormality detector 18 sets the abnormality detection signal F when the AC system voltage abnormally drops due to an abnormality in the AC system, and when the voltage returns to the normal state,
The abnormality detection signal F is cleared.

FIG. 3 is a block diagram showing an example of the configuration of the AC system abnormality detector 18 in the first embodiment shown in FIG.
The AC system abnormality detector 18 includes a voltage amplitude detector 40 and a voltage level determiner 41. Voltage amplitude detector 4
0 detects the amplitude of the AC voltage based on Formula 1 or Formula 2 and outputs the voltage amplitude detection value. The voltage level determiner 41 outputs the abnormality detection signal F by the abnormality detection signal set level signal Set when the output voltage amplitude detection value is lower than the voltage drop detection level Vd, and the voltage amplitude detection value detects the voltage return detection. When it is higher than the level Vup, the abnormality detection signal F is cleared by the abnormality detection signal clear level signal Clr.

When the voltage restoration detection level Vup is set to be larger than the voltage drop detection level Vd to have a hysteresis characteristic, a stable output can be obtained even when the output of the voltage amplitude detector 40 fluctuates near the detection level. can get.

FIG. 4 is a block diagram showing another example of the configuration of the AC system abnormality detector 18 in the first embodiment of FIG. In this example, when the voltage amplitude detector 40 detects the amplitude of the AC voltage based on Equation 1 for obtaining the instantaneous voltage amplitude, if the detected value fluctuates due to the influence of the unbalanced component of the voltage or the DC component, the abnormality detection signal The detector configuration is used to reliably obtain F. The detection value of the voltage amplitude detector 40 is input to the voltage level determiner 41 via the filter 42. That is, the fluctuation of the positive multiple component of the power supply frequency due to the unbalanced component of the AC voltage is attenuated by the filter 42 and input to the voltage level determiner 41. With this configuration, the abnormality detection signal F can be reliably obtained even in the voltage unbalanced state when the AC system is abnormal.

As already explained, the voltage amplitude detector 40
When Equation 2 is used as, since a stable voltage amplitude detection value can be obtained even in a voltage unbalanced state when the AC system is abnormal,
The configuration of FIG. 3 is sufficient.

The excitation current holding device 16 of FIG. 2 outputs the input excitation current command value Idc as it is when the abnormality detection signal F is not set, and when the abnormality detection signal F is set, The output value is held at the input value immediately before the abnormality detection signal F is set or at a predetermined value.

The torque component current holder 17 outputs the inputted torque component current command value Iqc as it is when the abnormality detection signal F is not set, and outputs the output value when the abnormality detection signal F is set. The input value immediately before the abnormality detection signal F is set or a predetermined value is held.

AC voltage controller 8 and active power controller 2
The control configuration including the control element of the integral system has a function of stopping the integral operation when the abnormality detection signal F is set in order to prevent the accumulation of errors while the AC system abnormality occurs.

According to the control device having such a configuration, as shown in FIG.
Even if the voltage state shown in (b) is reached, the exciting current is held constant, so the generator induced voltage E0 becomes constant, and the AC voltage controller 8 and active power controller 2 responded very quickly. In this case, the voltage relationship as shown in FIG. 1C is prevented, and immediately after the abnormality of the AC system is removed,
By controlling so as to return to the state of FIG. 1A, it is possible to prevent the generation of an excessive voltage.

The excitation component current holder 16 receives the abnormality detection signal F
If is not set, the input excitation current command value Idc is output as it is, and if the abnormality detection signal F is set, the output value is set to the input value immediately before the abnormality detection signal F is set or in advance. If a setting function of setting a predetermined value is provided, the excitation current command value Idc is narrowed to zero while an abnormality occurs in the AC system, and the AC voltage controller 8 immediately after the abnormality recovery. It is possible to quickly return to the output immediately before the abnormality detection held in.

Similarly, when the abnormality detection signal F is not set, the torque component current holder 17 also outputs the input torque component current command value Iqc as it is, and when the abnormality detection signal F is set, By providing a function of setting the output value to a predetermined value, the output immediately before the abnormality detection signal F is set can be immediately returned immediately after the abnormality recovery.

If the excitation current holder 16 and the torque current holder 17 are provided with such functions, the excitation current of the generator motor 14 is reduced and fixed while the abnormality continues in the AC system. It is possible to prevent an excessive current from flowing to the child side, and immediately after the abnormality recovery of the AC system, the output immediately before the abnormality detection held in the integration system by the abnormality detection signal F can be promptly returned to the abnormality of the AC system. The control performance immediately after the recovery is improved.

<Embodiment 2> FIG. 5 is a block diagram showing the control configuration of Embodiment 2 of the variable speed generator-motor system according to the present invention.

AC voltage error accumulation suppressor 21 of the second embodiment.
Is set to zero when the abnormality detection signal F which is the output of the AC system abnormality detector 18 is set, and the abnormality detection signal F
If is not set, the input value Ve is output as it is.

The AC voltage controller 24 is a controller including an integral element, and is composed of, for example, a proportional-integral controller. When an abnormality in the AC system is detected, the input of the AC voltage controller 24 becomes zero, so the excitation component current command value Idc accumulated in the control elements of the integration system up to that point is output, and the AC system is in an abnormal state. It is possible to prevent the accumulation of error.

The active power error accumulation suppressor 22 sets the output to zero when the abnormality detection signal F which is the output of the AC system abnormality detector 18 is set, and the input when the abnormality detection signal F is not set. The value Pe is output as it is.

The active power controller 23 is a controller including an integral element, and is composed of, for example, a proportional-integral controller. When the abnormality of the AC system is detected, the active power controller 23
Is zero, the torque current command value Iqc accumulated in the control element of the integral system up to that point is output, and it is possible to prevent the accumulation of errors during the AC system abnormality.

If the input error to the control system is zero when the AC system is abnormal as described above, the accumulated error accumulated in the control system is zero, so that a constant output state can be maintained and the state of the AC system is restored. At times, it is possible to return to the state before the abnormality occurred.

FIG. 6 shows an excitation current command value Idc,
It is a figure which shows a change of torque portion current command value Iqc and generator motor terminal voltage VG in comparison with a conventional system.

As described above, in the conventional AC voltage control system, the generator motor terminal voltage VG is detected, and the exciting current on the secondary side of the generator motor is controlled so as to keep this voltage VG constant. . However, when the control response speed is faster than several cycles of the power supply cycle, the exciting current on the secondary side of the generator motor is increased faster than the abnormality of the AC system is eliminated, and as shown in FIG. 1 (c). Voltage vector. Figure 1
In the state of (c), since the magnitude of the exciting current is increased to the limit value by changing the exciting current command value Idc and the torque current command value Iqc, the generator motor induced voltage VG is
It will be the maximum. Therefore, after that, overshoot and ringing occur in the generator motor induced voltage VG, and it took time to return to the state before the abnormality occurred.

On the other hand, in the present invention, when the abnormality detection signal F is set, the excitation value current command value Idc and the torque current value command value Iqc immediately before the abnormality detection signal F is set are output. Alternatively, the generator motor induced voltage VG is suppressed from overshooting or ringing because it is held at a predetermined value. Even if the AC voltage controller 8 or the active power controller 2 responds at a very high speed, FIG.
It is possible to prevent the occurrence of an excessive voltage by suppressing such a voltage relationship and controlling to return to the state of FIG. 1A immediately after the abnormality of the AC system is removed.

In the variable speed pumped storage power generation system and the variable speed flywheel power generation system to which the variable speed generator motor system according to the present invention is applied, the AC voltage control and the active power control are not disturbed during the abnormality of the AC system. Since it can be operated, it is not necessary to set the control response speed slower in consideration of such an AC system abnormality, and it becomes possible to set the optimum response for the system, and the high-speed AC voltage control response and active power control response It is possible to construct an optimum system for suppressing and stabilizing the fluctuation of the power system.

[0054]

According to the present invention, when an abnormality such as a three-phase short circuit occurs in an AC system of a fixed frequency, the abnormality is detected and the exciting current is set to an input value immediately before the abnormality is detected or a predetermined value. Therefore, the AC voltage or the active power does not become excessive with respect to the normal value immediately after the abnormality is removed, and the original state can be quickly restored.

Further, since the abnormality of the fixed frequency AC system is detected and the operation of the voltage adjusting means and the active power adjusting means of the stator winding of the generator motor is stopped, a three-phase short circuit or the like occurs in the AC system. If any abnormality occurs, the excitation current command and the torque current command can be kept constant, and immediately after the abnormality is removed, the AC voltage and active power do not become excessive and promptly return to the original state. I can return.

Further, since a means for detecting a voltage corresponding to the positive phase is provided when detecting an abnormality in the AC system,
Even when the AC voltage is unbalanced, the AC system abnormality can be detected stably.

As a result, the variable speed generator / motor system can be operated without disturbing the control of the AC voltage control and active power control during the abnormality of the AC system, and the optimum response setting as a system can be achieved, thereby enabling high-speed AC. A voltage control response and an active power control response can be realized, and an optimum system can be constructed for suppressing or stabilizing the fluctuation of the power system.

[Brief description of drawings]

FIG. 1 is a voltage vector diagram illustrating an operation of a secondary excitation power generation system when an abnormality occurs on the AC power system side.

FIG. 2 is a block diagram showing a control configuration of a first embodiment of a variable speed generator-motor system according to the present invention.

FIG. 3 is a block diagram showing an example of the configuration of an AC system abnormality detector according to the first embodiment of FIG.

FIG. 4 is a block diagram showing another example of the configuration of the AC system abnormality detector in the first embodiment of FIG.

FIG. 5 is a block diagram showing a control configuration of a second embodiment of the variable speed generator-motor system according to the present invention.

FIG. 6 is a diagram showing transitions of an excitation current command value Idc, a torque current command value Iqc, and a generator motor terminal voltage VG of the present invention in comparison with a conventional method.

[Explanation of symbols]

Clr Abnormal detection signal clear level Increase in dV generator motor terminal voltage VG E0 Generator motor induced voltage vector Etr Excitation transformer F Abnormality detection signal Id Excitation current detection value Idc Excitation current command value Iq Torque current detection value Iqc Torque current command value Mtr Main transformer P active power Pc active power command value Pe input value Set Abnormal detection signal set level V0 power system Vc AC voltage command value VG generator motor terminal voltage VL AC system voltage vector VLa AC voltage detection value Vu Three-phase AC voltage Vv three-phase AC voltage Vw Three-phase AC voltage Voltage drop due to leakage reactance of ZGI generator motor Voltage drop due to leakage reactance of ZTI main transformer 2 Active power controller 5 Active power detector 7 AC voltage detector 8 AC voltage controller 9 Power supply voltage phase detector 10 Generator motor rotor phase detector 11 Slip phase detector 12 Current detector 13 Current controller 14 generator motor 15 Exciter 16 Excitation current holder 17 Torque current retainer 18 AC system abnormality detector 21 AC voltage error accumulation suppressor 22 Active power error accumulation suppressor 23 Active power controller 24 AC voltage controller 40 Voltage amplitude detector 41 Voltage level determiner 42 filters

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuyuki Headquarters 7-1, 1-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Research Laboratory, Hitachi, Ltd. (72) Inventor Shigehiro Kasukawa 3-chome, 3-cho, Hitachi-shi, Ibaraki No. 1 Hitachi Ltd., Hitachi Factory (72) Inventor Akiyo Moka 3-1-1, Saiwaicho, Hitachi City, Ibaraki Prefecture Hitachi Ltd. (72) Inventor, Yuichi Kato Sanno Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Inc. 3-22 Kansai Electric Power Co., Inc. (72) Inventor Toru Nishio Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture 3-3 22 In Kansai Electric Power Co., Inc. (72) Akira Ryoman Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture 3-3-22 Kansai Electric Power Co., Inc. (56) Reference JP-A-9-331699 (JP, A) JP-A-3-155398 (JP, A) JP-A-10-28398 (J , A) JP-A-4-271226 (JP, A) JP-A-2-146996 (JP, A) JP-A-3-60400 (JP, A) JP-A-63-218000 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02P 9/14

Claims (4)

(57) [Claims] 1. One of the rotor winding and the stator winding is crossed.
The generator / motor connected to the
Power to the other side of the winding.
Excitation means for outputting and exciting an alternating current, the alternating current power source and the front
All of the detected values based on the voltage phase of the rotor of the generator motor.
The AC excitation current from the excitation means is
Means for converting the electric current and the torque component electric current,
In order to control the AC voltage of the machine,
AC voltage control hand that determines the command value of the excitation current based on
Stage, and to control the active power of the generator motor
Based on the calculated value of active power,
The active power control means to be decided and the excitation current command value and
And the torque distribution current command value
Current control means for controlling the flow and torque component current
In the variable speed generator motor system, Abnormality of the AC power supply systemAnd removal of anomaliesTo detect
Providing flow system abnormality detection means, When an abnormality occurs in the AC power supply system, the excitation component current
The command value immediately before the abnormality detectionInput valueExcitation distribution to hold
When an abnormality occurs in the flow holding means and the AC power supply system
The torque current command value immediately before the abnormality detection is set.Input value
Torque holding current holding meansAnd When the abnormality of the AC power supply system is removed, the excitation component
The holding function of the current holding means and the torque holding current holding means
A holding release means to release is provided Variable speed characterized by
Generator motor system. 2. One of the rotor winding and the stator winding is crossed.
The generator / motor connected to the
Power to the other side of the winding.
Excitation means for outputting and exciting an alternating current, the alternating current power source and the front
All of the detected values based on the voltage phase of the rotor of the generator motor.
The AC excitation current from the excitation means is
Means for converting the electric current and the torque component electric current,
AC including an integral element for controlling the AC voltage of the machine
Determine the command value of the excitation current based on the detected voltage value
AC voltage control means and control the active power of the generator motor
Based on the calculated value of the active power including an integral element
Active power control means for determining the command value of the torque current
And the excitation current command value and torque current command value
Based on the excitation current and torque current of the exciter,
Variable speed generator motor system with current control means for controlling
In the system Abnormality of the AC power supply systemAnd removal of anomaliesTo detect
Providing flow system abnormality detection means, When an abnormality occurs in the AC power supply system, the AC voltage
Input to the AC voltage control means including the integral element of the detected value
AC voltage error accumulation suppressing means for preventing
When an abnormality occurs in the grid, the calculated value of the active power
Yes to block input to active power control means including integral element
Effective power error accumulation suppression meansAnd When the abnormality of the AC power supply system is eliminated, the AC power
Of the pressure error accumulation suppressing means and the active power error accumulation suppressing means
Equipped with a release means to release the error accumulation suppression function Special
A variable-speed generator-motor system to be considered. 3. The variable speed generator-motor system according to claim 1 or 2 , wherein the AC system abnormality detecting means detects the three-phase AC voltage from the AC voltage.
Amplitude of fundamental wave component obtained by integral calculation during fundamental wave period
A variable speed generator-motor system, which is means for judging whether or not there is an abnormality on the side of the AC power supply system based on a detected value . 4. The variable speed generator-motor system according to claim 1 , wherein the holding release means or the release operation of the error accumulation suppressing function is released.
The voltage level at which the stage operates depends on the holding means or the erroneous
A variable-speed generator-motor system characterized by having a hysteresis characteristic that the difference accumulation suppression function is higher than the voltage level at which it starts operating .