JP5693337B2 - Generator control device - Google Patents

Description

  The present invention relates to a power generation system connected to a power system, in particular, a generator capable of causing output power to stably follow a control amount command such as a power command even when an accident such as a voltage drop occurs in the power system. The present invention relates to a control device.

When a ground fault or an abnormality such as voltage or frequency occurs in the power system, for example, the wind power generation system takes measures such as stopping the power generation operation to protect the device. Moreover, a wind power generation system interrupts | blocks the main circuit and power system of a wind power generation system with the switch provided between an electric power system, a power converter, and a generator. However, in the case of a minor accident or a short-time accident of several seconds, it is required to continue the power generation operation by suppressing the output power without completely shutting off. In particular, in Europe and the United States, LVRT (Low Voltage Ride Through) or FRT (Fault Ride Through) function, which performs continuous operation without disconnecting wind power generators, is regarded as important, and the grid interconnection requirements are defined. ing.
Examples of a wind power generation system that pursues continuous operation without disconnecting a wind power generator even if an accident occurs in the power system include Patent Document 1 and Patent Document 2.

  By the way, in order not to disconnect the wind power generation system when an accident occurs in the power system, it is necessary to quickly suppress and process the power supplied by the generator and follow the power command zero while continuing the power generation operation. It is necessary to let In addition, it is necessary to take measures to consume the power sent from the generator during a period in which power cannot be supplied to the power system. At this time, in order to consume the electric power sent from the generator until the power generation system is restored, a load circuit such as a resistor may be installed, but depending on the power scale, a large resistance circuit is required. A problem of heat generation occurs.

JP 2010-035418 A Japanese Patent No. 3903967

However, in the configuration described in Patent Document 1 described above, an increase in the rotational speed of the windmill is suppressed by controlling the pitch angle of the blades. However, since the response of the pitch angle control is slow, power is required until the pitch angle control is performed. There is a problem that is output. During that period, since the wind power generation system cannot output power from the power converter, the windmill may rotate at a high speed or the DC voltage of the power converter may increase.
In the configuration described in Patent Document 2 described above, when the abnormality detection device detects an abnormality in rotational speed or voltage, reactive power is injected into the induction machine type wind power generator to induce induction machine type wind power generation. The rotation speed and voltage of the machine are controlled in a stable manner, but in a large-capacity wind power generation system using permanent magnets, all the electric power is input to the power converter, so it is not always possible to obtain a sufficient effect. There wasn't.

  This invention was made in order to solve the conventional problems as described above, without following up the generator promptly following a sudden change such as a power command accompanying the occurrence of a power system accident, It is an object of the present invention to obtain a generator control device that enables stable control operation.

The generator control device according to the present invention supplies the power to the power system by controlling the generator so that the detection control amount follows the control amount command,
A current detection circuit that detects a generator current and outputs a detected current, inputs a controlled variable command, detected power, and primary frequency command, calculates a controlled variable deviation between the controlled variable command and the detected controlled variable, and controls the controlled variable deviation A frequency command calculation circuit that calculates a frequency command based on the frequency command correction circuit that inputs a frequency command and a detection current, performs a correction calculation necessary for the frequency command, and outputs it as a primary frequency command, a primary frequency command and a detection current In a generator control device including a voltage command calculation circuit that calculates a voltage command and detected power based on the voltage command, and a power conversion circuit that converts the generated power of the generator based on the voltage command and outputs it to the power system ,
When detecting the accident of the power system, it is possible to suppress the control amount command for a predetermined time, the frequency command calculation circuit or a frequency command correcting circuit, switching to the high follow-up circuit to enhance the followability to the primary frequency command frequency reference Control circuit switching means is provided .

Generator control device according to the present invention, as described above, upon detection of the accident of the power system, it is possible to suppress the control amount command for a predetermined time, the frequency command calculation circuit or a frequency command correcting circuit, the frequency Control circuit switching means that switches to a high-following circuit that improves follow-up to the primary frequency command of the command, so there is an unstable phenomenon between the frequency command and the primary frequency command that can occur immediately after an accident in the power system Stable control characteristics that are suppressed and follow the control amount command promptly as a whole can be obtained.

It is a block diagram which shows the structure of the control apparatus of the generator of Embodiment 1 of this invention. It is a detailed block diagram which shows the internal structure of the frequency command calculating circuit 2 of FIG. It is a detailed block diagram which shows the internal structure of the voltage command calculating circuit 4 of FIG. It is a block diagram which shows the internal structure of the control block 22 of FIG. It is a block diagram which shows the structure of the generator control apparatus of Embodiment 2 of this invention. It is a block diagram which shows the structure of the control apparatus of the generator of Embodiment 3 of this invention. It is a block diagram which shows the structure of the control apparatus of the generator of Embodiment 4 of this invention. It is a detailed block diagram which shows the internal structure of the frequency command calculating circuit 40 of FIG.

Embodiment 1 FIG.
Embodiment 1 of the present invention includes a device for detecting a ground fault in a power system or an abnormality such as a voltage or a frequency in a wind power generation system. It is configured so that the generator can be continuously operated stably without disconnecting the generator.

Here, in particular, the wind power generation system is taken up in the power generation system using the rotational energy of the turbine, which is represented by nuclear power, thermal power, and hydropower, in accordance with the detection of the system abnormality, Although the water flow can be controlled to some extent by the regulating valve, the wind power generation system cannot control the wind that is the power source. When a grid fault occurs in a wind power generation system, there is a risk that the windmill will accelerate with over-torque power and rotate at overspeed.
In this sense, the present invention is particularly useful when applied to a wind power generation system, but it goes without saying that the present invention can also be applied to power generation systems other than wind power generation systems.

Hereinafter, a generator control apparatus according to Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a generator control apparatus according to Embodiment 1 of the present invention, including main circuit equipment such as a generator.
In FIG. 1, a frequency command calculation circuit 2 calculates a frequency command ωs based on a power command P * as a control amount command input via the input terminal 1. The frequency command correction circuit 3 performs a correction calculation necessary for the frequency command ωs and outputs the primary frequency command ω1 for the purpose of stabilizing the operation, such as preventing the step-out due to the frequency command ωs or a sudden change in load. The voltage command calculation circuit 4 calculates and outputs three-phase AC voltage command values Vu *, Vv *, Vw * from the primary frequency command ω1. The integrating circuit 5 integrates the primary frequency command ω1 and outputs a control phase θ. The coordinate conversion circuit 6 converts the three-phase alternating currents iu, iv, iw detected by the current detection circuits 10, 11, 12 into current values id, iq in the rotating coordinate system. The above described frequency command calculation circuit 2, frequency command correction circuit 3, voltage command calculation circuit 4 and integration circuit 5 constitute a control block 14 surrounded by a wavy line in the figure.

  The generator-side converter 9 is connected to a permanent magnet type synchronous generator 13 as a variable speed synchronous generator that rotates using wind energy as a motive power using a permanent magnet as a rotor, and AC power from the generator is converted into DC power. Convert. The system side converter 8 converts the DC power from the generator side converter 9 into AC power and outputs the AC power to the power system 7. The system side converter 8 and the generator side converter 9 constitute a power conversion circuit.

Next, the operation will be described. In each embodiment of the present invention, the voltage command value is calculated from the current values detected by the current detection circuits 10, 11, and 12 without using a rotation sensor or a position sensor, and sensorless control of the wind power generator 13 is stably performed. .
The power command P * is input to the input terminal 1 from the host system. The frequency command calculation circuit 2 calculates the frequency command ωs using the power command P *, the detected power P input from the voltage command calculation circuit 4 and the primary frequency command ω1 input from the frequency command correction circuit 3.

FIG. 2 shows an internal configuration of the frequency command calculation circuit 2. In FIG. 2, the subtracter 18 subtracts the detected power P input through the input terminal 16 from the power command P * input through the input terminal 15 and serving as a detected control amount in this case. The power deviation as the deviation is calculated. The divider 19 divides the output of the subtracter 18 by the rotation frequency ω input via the input terminal 17.
The above calculation is expressed by the following equation (1), and the divider 19 outputs a torque deviation ΔT.

  The integrator 20 integrates the output ΔT of the divider 19 by inverting the sign based on the following equation (2), and outputs the result to the output terminal 21 as the frequency command ωs.

  In the above formula (1), in the case of a synchronous generator, the frequency of the generator terminal voltage and the rotation frequency are the same, and the rotation frequency ω can be calculated using the primary frequency command ω1. In this way, the output power stably follows the power command by performing the frequency command calculation using the rotation frequency.

  The control block 22 is a block that controls the integrator 20 when an accident such as a voltage drop is detected in the power system 7, and is a main part of the present invention. For the sake of convenience, the contents will be described in detail after the description of the subsequent circuit.

  For example, the frequency command correction circuit 3 corrects the frequency command ωs for the purpose of stabilizing the operation. Since a synchronous generator does not slip like an induction generator, the frequency command value is corrected so as to prevent step-out due to a sudden change in the frequency command value or load. An example of this compensation method is shown in, for example, the well-known technique “performance enhancement of V / f control of a permanent magnet synchronous motor” described in IEEJ Transactions D Vol. 122, No. 3 (2002). . The detected current value iq is fed back to perform processing such as a high-pass filter, and the primary frequency command ω1 is calculated and output while suppressing the occurrence of rotational frequency deviation.

  The voltage command calculation circuit 4 calculates voltage commands Vd * and Vq * on the dq axis of the rotating coordinate system from the primary frequency command ω1, and further converts the voltage commands Vd * and Vq * to generate a three-phase AC voltage command. Vu *, Vv *, and Vw * are calculated. The voltage commands Vd * and Vq * on the dq axis can be calculated by, for example, equation (3) using the current values id and iq on the dq axis.

  At this time, R is the value of the primary winding resistance of the generator, and the terms R · id and R · iq correct the voltage drop when the current flows. In the V / f constant control method generally known as sensorless control, the primary frequency command ω1 and the amplitude of the primary line voltage value V1 are controlled to have a proportional relationship. It is possible to use the same K as the coefficient of V / f constant control. For example, the same value as the q-axis voltage command at no load is used.

  FIG. 3 shows an internal configuration of the voltage command calculation circuit 4. In FIG. 3, the multiplication circuit 27 multiplies the d-axis current id input via the input terminal 23 by the resistance value R. The multiplication circuit 28 multiplies the q-axis current iq input via the input terminal 24 by the resistance value R. The multiplication circuit 30 multiplies the primary frequency command ω <b> 1 input via the input terminal 25 by a coefficient K. The adder 29 adds the output of the multiplication circuit 28 and the output of the multiplication circuit 30. The coordinate conversion circuit 31 converts the voltage command values Vd * and Vq * of the rotating coordinate system into voltage command values Vu *, Vv *, and Vw * for three-phase alternating current, and outputs them to the output terminals 32, 33, and 34.

  The voltage command calculation circuit 4 converts the voltage command values Vd * and Vq * into three-phase AC Vu *, Vv *, and Vw * and outputs them. The voltage on the dq axis is expressed using the following equation (4). The command is converted into a three-phase AC voltage command of U-V-W.

  From the equation (4), the coordinate conversion circuit 31 calculates the equation (5) to calculate the three-phase voltage commands Vu *, Vv *, and Vw *.

  Further, the voltage command calculation circuit 4 calculates and outputs the detected power P by using the detected current values id and iq and the voltage command values Vd * and Vq * by the equation (6).

  Returning to FIG. 1, the integrating circuit 5 calculates the control phase θ. The control phase θ is synchronized with the rotation of the rotor of the wind power generator and indicates the control phase in the rotating coordinate system. The control phase θ can be obtained by integrating the primary frequency command ω1 according to equation (7).

  The coordinate conversion circuit 6 converts the current value of the three-phase alternating current detected by the current detection circuits 10, 11, and 12 into a current value on the dq axis and outputs the current value. A conversion formula from the three-phase AC coordinate system to the dq axis is expressed by the following formula (8).

  Therefore, the current values id and iq can be obtained from the equation (9).

  At this time, if iw = −iu−iv, it can be obtained simply by equation (10).

  The generator side converter 9 is connected to the wind power generator 13, converts the AC power generated by the generator 13 into DC power, and outputs the DC power to the DC link. In a DC link, smoothing is generally performed by a capacitor or the like. The system side converter 8 is connected to the power system 7 side, converts the DC power from the DC link into AC power synchronized with the frequency on the power system 7 side by PWM processing or the like, and outputs the AC power. A circuit breaker (not shown in FIG. 1) is installed between the electric power system 7 and the system side converter 8.

Next, returning to FIG. 2, the configuration and operation of the frequency command calculation circuit 2, particularly, the control block 22 which is a main part of the present invention will be described.
When an accident such as a voltage drop occurs in the power system, it is necessary to quickly suppress the power output from the wind power generation system. However, in general, the control response of the wind power generation system is not set so fast from the viewpoint of emphasizing the stabilization of the control, and thus the output power cannot be controlled in a short time.

When the occurrence of an accident in the power system is detected, the power command P * is rapidly suppressed to, for example, 0, but as described above, the control time constants of the frequency command calculation circuit 2 and the frequency command correction circuit 3 are Since it is set to a relatively large value, in particular, an unstable vibration or the like is unstable between the frequency command ωs output from the frequency command calculation circuit 2 and the primary frequency command ω1 output from the frequency command correction circuit 3. As a result, it is conceivable that stable control characteristics that promptly follow the power command as a whole cannot be obtained.
Therefore, in the present invention, the control block 22 that directly controls the output of the integrator 20 when a system fault is detected is provided so that the frequency command ωs can quickly follow the primary frequency command ω1.

  FIG. 4 is a block diagram showing the internal configuration of the control block 22. In order to improve the followability of the frequency command ωs to the primary frequency command ω1, a selector 51 and a selector 52 are provided as control circuit switching means for switching to the high follower circuit. Although not shown in FIG. 2, an abnormality detection signal from an accident occurrence detection sensor of the power system 7 is input to the selector 51 and the selector 52.

Next, the operation of switching to the high follower circuit that improves the followability of the frequency command ωs to the primary frequency command ω1 by the selectors 51 and 52 will be described.
When an abnormality detection signal is input, the selector 51 replaces the torque command ΔT from the divider 19 that has been sent to the integrator 20 for a period of one cycle of calculation by a microcomputer or the like. 3 to the primary frequency command ω1. The selector 52 outputs the primary frequency command ω1 from the frequency command correction circuit 3 as the frequency command ωs instead of the output from the integrator 20 so far. That is, the above-described high tracking circuit that operates based on the primary frequency command ω1 when the power command changes suddenly is formed. When one cycle of the calculation is over, the selectors 51 and 52 return their switching positions to the original positions.

  By the switching operation of both the selectors 51 and 52, the initial value of the integration operation in the integrator 20 is once reset by the primary frequency command ω1 and the integration operation is restarted from this initial value simultaneously with the occurrence of the system fault. Unstable phenomena such as unnecessary vibration are suppressed between ωs and the primary frequency command ω1, and the frequency command ωs can quickly follow the primary frequency command ω1. As a result, stable control characteristics that quickly follow the power command as a whole can be obtained.

As described above, the control time constant of the frequency command calculation circuit 2 that is set on the assumption that the power system 7 is normal, that is, the normal value of the turbine / wind power is generally considered in consideration of the stability of the control characteristics. It is necessary to set a time constant (first control time constant) equivalent to the inertia of the generator.
Therefore, as another modification of the control circuit switching means, a method of causing the frequency command ωs to quickly follow the primary frequency command ω1 by switching the control time constant of the frequency command calculation circuit 2 can be considered. That is, although not particularly illustrated, when an accident in the power system 7 is detected, the first control time constant of the frequency command calculation circuit 2 including the integrator 20 is set to a second value smaller than the first control time constant. Switching to a high-following circuit with a control time constant is set so that the response becomes faster only during a period in which output power is suppressed.

  Similarly to the frequency command calculation circuit 2, the frequency command correction circuit 3 also has a third control time constant that is normally set when an accident in the power system 7 is detected as a control circuit switching means. As a further modification, a control time constant switching means for switching to a high tracking circuit with a fourth control time constant smaller than the control time constant is provided, and the setting is made so that the response is accelerated only during the period in which the output power is suppressed. May be.

  As described above, in the first embodiment of the present invention, since the control circuit switching means for switching to the high tracking circuit is provided in order to improve the tracking performance of the frequency command ωs to the primary frequency command ω1, the frequency command ωs and the primary frequency Unstable phenomena such as unnecessary vibrations are suppressed between the command ω1 and the frequency command ωs can quickly follow the primary frequency command ω1, and the stable control characteristic can quickly follow the power command as a whole. Is obtained.

Embodiment 2. FIG.
FIG. 5 is a block diagram showing a generator control apparatus according to Embodiment 2 of the present invention. The difference from the first embodiment is that the AC side switch circuit 35 and the load circuit 36 are arranged between the generator side converter 9 and the wind power generator 13. When an accident occurs, control is performed so that a current flows through the load circuit 36, and power is consumed. 5, components that perform the same operations as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted, and the other portions will be described.

  The AC side switch circuit 35 is turned on when an abnormality in the power system is detected. The load circuit 36 includes a resistor that can consume power, and consumes the U-V-W three-phase current as heat. In the second embodiment, the control is performed in the same manner as in the first embodiment, and when the power system abnormality is detected, the load circuit 36 is turned on in parallel with suppressing the output power by setting the power command to zero. Thus, the power input to the generator-side converter 9 is suppressed.

  As described above, in the second embodiment of the present invention, even in a configuration in which power consumption is mainly performed by the load circuit 36 until the power system is restored, the control response is improved and the power command is promptly zeroed. Therefore, it is possible to suppress an increase in DC voltage.

Embodiment 3 FIG.
FIG. 6 is a block diagram showing a generator control apparatus according to Embodiment 3 of the present invention. The difference from the first embodiment is that the DC side switch circuit 37 and the load circuit 38 are arranged in the DC link between the system side converter 8 and the generator side converter 9. In the embodiment, the system is configured to consume power by controlling the current to flow from the DC link to the load circuit 38 when a system fault occurs. In FIG. 6, the same reference numerals are given to those performing the same operation as in FIG. 1, and the description thereof will be omitted while omitting those descriptions.

  The DC side switch circuit 37 is turned on when an abnormality in the power system is detected. The load circuit 38 includes a resistor that can consume power, and consumes the DC link current as heat. In the third embodiment, control is performed in the same manner as in the first embodiment, and when a power system abnormality is detected, the load circuit 38 is turned on in parallel with suppressing the output power by setting the power command to zero. Thus, the power input to the grid-side power converter 8 is suppressed.

  As described above, in the third embodiment of the present invention, similarly to the second embodiment, the control responsiveness can be achieved even in the configuration in which the power consumption is performed mainly by the load circuit 38 until the power system is restored. As a result, the power command can be made to follow zero quickly, and the load circuit can be configured with a smaller capacity than the conventional one, and the power consumption can be reduced.

Embodiment 4 FIG.
FIG. 7 is a block diagram illustrating a generator control apparatus according to Embodiment 4 of the present invention. The difference from the first embodiment is that it is controlled by a torque command. In this embodiment, the first embodiment has been described even in a situation where the torque command T * is given from the host. Similar effects can be obtained. 7, components that perform the same operations as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted, and the other portions will be described.

  In FIG. 7, a frequency command calculation circuit 40 calculates a frequency command ωs based on a torque command T * as a control amount command input via an input terminal 39. The above-described frequency command calculation circuit 40, frequency command correction circuit 3, voltage command calculation circuit 4 and integration circuit 5 constitute a control block 41 surrounded by a wavy line in the figure.

  Next, the operation will be described. In the embodiment of the present invention, as in the embodiment of FIG. 1, the voltage command value is calculated from the current value detected by the current detection circuits 10, 11, and 12 without using the rotation sensor or the position sensor, and is stable. Perform sensorless control of wind power generators. A torque command T * is input to the input terminal 39 from the host system. The frequency command calculation circuit 40 calculates the frequency command ωs using the torque command T *, the detected power P input from the voltage command calculation circuit 4 and the primary frequency command ω1 input from the frequency command correction circuit 3.

Next, details of the frequency command calculation circuit 40 will be described with reference to FIG. 8, components that perform the same operations as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted, and the other portions will be described.
The divider 43 calculates a detection torque as a detection control amount by dividing the detection power P input via the input terminal 16 by the primary frequency command ω1. The subtracter 44 subtracts the output of the divider 43 from the torque command T *.
The above calculation is expressed by the following equation (11), and the subtractor 44 outputs a torque deviation ΔT as a control amount deviation.

  The integrator 45 integrates the output ΔT of the subtractor 44 based on the following equation (12), and outputs it to the output terminal 46 as a frequency command ωs. In the above equation (11), in the case of a synchronous generator, the frequency of the generator terminal voltage and the rotation frequency are the same, and the rotation frequency can be calculated using the primary frequency command ω1. In this way, the output power stably follows the power command by performing the frequency command calculation using the rotation frequency.

  The control block 47 is a block that controls the integrator 45 when an accident such as a voltage drop is detected in the power system. In the fourth embodiment, the control described in FIG. 4 of the first embodiment is also performed. Similar to the block 22, the output of the integrator 45 is directly controlled when a system fault is detected. In other words, control circuit switching means for switching to the high tracking circuit is provided in order to improve the tracking performance of the frequency command ωs to the primary frequency command ω1. Specifically, as described in the first embodiment, a method of once resetting the initial value of the integrator using the selector and a method of switching the control time constant of the frequency command calculation circuit or the frequency command correction circuit are similarly adopted. It is possible and has the same effect.

  As described above, in the fourth embodiment of the present invention, since the control circuit switching means for switching to the high tracking circuit is provided in order to improve the tracking performance of the frequency command ωs to the primary frequency command ω1, the frequency command ωs and the primary frequency Unstable phenomena such as unnecessary vibration are suppressed between the command ω1 and the frequency command ωs can quickly follow the primary frequency command ω1, and the stable control characteristic that quickly follows the torque command as a whole. Is obtained.

  In each embodiment of the present invention, the case where it is applied to a permanent magnet type synchronous generator has been described as an example. Similarly, in the case of a configuration having a power converter on the power system side, secondary excitation type power generation The present invention can be similarly applied to wind power generation systems such as a power generator and a DC excitation type synchronous generator, and other power generation systems, and has the same effect. In addition, it is possible to realize the configuration shown in each embodiment by appropriately combining the configurations.

2,40 Frequency command calculation circuit, 3 Frequency command correction circuit, 4 Voltage command calculation circuit,
5 integration circuit, 6 coordinate conversion circuit, 7 power system, 8 system side converter,
9 Generator side converter, 10, 11, 12 Current detection circuit, 13 Permanent magnet type synchronous generator, 20, 45 Integrator, 22, 47 Control block.

Claims (11)

The generator is controlled so that the detected control amount follows the control amount command and power is supplied to the power system,
A current detection circuit that detects a current of the generator and outputs a detected current, inputs the control amount command, the detected power, and a primary frequency command, and calculates a control amount deviation between the control amount command and the detected control amount A frequency command calculation circuit that calculates a frequency command based on the control amount deviation, a frequency command correction circuit that inputs the frequency command and the detected current, performs a correction calculation necessary for the frequency command, and outputs a primary frequency command; A voltage command calculation circuit that calculates a voltage command and the detected power based on a primary frequency command and the detected current, and a power conversion circuit that converts the generated power of the generator based on the voltage command and outputs it to the power system In the generator control device comprising :
Upon detection of the accident before Symbol power system, it is possible to suppress the control amount command, a predetermined time, the frequency command calculation circuit or the frequency command correcting circuit, the follow-up of the primary frequency command of the frequency instruction A generator control device comprising control circuit switching means for switching to a high tracking circuit to be enhanced . The frequency command calculation circuit converts the control amount deviation into torque deviation, and uses the output of an integrator that operates with the torque deviation as input as the frequency command,
The control circuit switching means switches the input of the integrator from the torque deviation to the primary frequency command for one period of calculation as the predetermined time, and outputs the frequency command calculation circuit from the output of the integrator to the primary frequency command. The generator control device according to claim 1, wherein the frequency command calculation circuit is switched to the high tracking circuit by switching to a primary frequency command. The control circuit switching means has a first control time constant smaller than the first control time constant from a first control time constant set when the power system is normal for the control time constant of the frequency command arithmetic circuit for the predetermined time. The generator control device according to claim 1, wherein the frequency command calculation circuit is switched to the high tracking circuit by switching to a control time constant of 2. Before SL control circuit switching means, the third control time constant of the power system a control time constant of the predetermined time said frequency command correcting circuit is set when the normal, the third control time constant smaller than fourth, wherein it said frequency command correcting circuit by Rukoto includes a control time constant switching means for switching the control time constant in any one of claims 1 to 3, characterized in that switching to the high follow-up circuit Generator control device. The power conversion circuit controls a terminal voltage of the generator based on the voltage command and fixes a generator-side converter that converts variable-frequency generated power output from the generator into DC power and the DC power The generator control device according to any one of claims 1 to 4, further comprising: a system-side converter that converts the power into frequency AC power and outputs the power to the power system. Comprising an AC side load circuit connectable to a connecting portion between the generator and the generator side converter via an AC side switch circuit;
6. The generator control device according to claim 5, wherein when the occurrence of an accident in the power system is detected, the AC side switch circuit is switched from open to closed. A DC side load circuit that can be connected to a connection part between the generator side converter and the system side converter via a DC side switch circuit,
6. The generator control device according to claim 5, wherein when the occurrence of an accident in the power system is detected, the DC side switch circuit is switched from open to closed. The control amount command is a power command, and the frequency command calculation circuit receives the power command and the detected power as the detection control amount and the primary frequency command, and the power command as the control amount deviation. The generator control device according to claim 1, wherein a power deviation from the detected power is calculated, and the frequency command is calculated based on the power deviation. The control amount command is a torque command, and the frequency command calculation circuit inputs the torque command, the detected power, and the primary frequency command, and uses the detected power and the primary frequency command as the detected control amount. 8. A detected torque is calculated, a torque deviation between the torque command as the control amount deviation and the detected torque is calculated, and the frequency command is calculated based on the torque deviation. The generator control device according to any one of the above. 10. The generator control device according to claim 1, wherein the generator is a variable speed synchronous generator using a permanent magnet as a rotor. The generator control apparatus according to claim 1, wherein the generator is a wind generator using wind power as a power source.

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