JPH09312934A - Power system stabilizer for power system - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a power system stabilizing device for stabilizing a power system by minimizing the influence of power fluctuation on the system in a power system system using a DC power transmission facility as a means for absorbing and discharging AC power. provide. SOLUTION: First and second AC systems 10 and 20 are interconnected with a DC power transmission device 9 by AC power transmission lines 4 and 6, and each power converter of the DC power transmission device 9 is a converter control device 31 or 32. The DC transmission power Pdc is controlled to a commanded value. The electric power storage device 7 installed on the bus bar 5 has its electric power absorption and emission controlled by the electric power absorption and emission control device 41.
An electric power command to the electric power absorption / emission control device 41 is obtained by subtracting the output signal ΔPdc of the electric power fluctuation suppression control device 33 of the DC power transmission device 9 obtained via the information transmission device 50 from the electric power absorption / emission command value PesO in normal times. By creating the value Pes, it is possible to suppress fluctuations in the power flow supplied from the DC power transmission device 9 to the AC system 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system stabilizing device in a power system system in which a DC power transmission device is connected between a plurality of AC power systems, and more particularly to an AC power system by power conversion by the DC power transmission device. The present invention relates to an electric power system stabilizing device for stabilizing electric power.

[0002]

2. Description of the Related Art It is possible to suppress power fluctuations in an electric power system by absorbing and releasing active power in an AC electric power system. Conventionally, for example, when a DC power transmission facility is used as a means for absorbing and discharging AC active power, the converter converted power of the DC power transmission facility is controlled to stabilize the power system to which the converter is connected. It becomes possible. When a power storage device is used as a means for absorbing and releasing active power, by controlling the output of the power storage device,
It is possible to stabilize the power system. For example, as disclosed in Japanese Patent Laid-Open No. 5-153732, there is already known a device that improves the stability of a power system by using a variable speed synchronous machine that can absorb and release electric power.

However, when the power storage device is used, a dedicated energy storage device and power conversion device are required, resulting in a large size of the device, expensive construction cost, difficulty of daily maintenance, and further, constant loss. It has been pointed out that there are problems such as a decrease in the efficiency of the power system due to the above-mentioned problems.
As shown in Japanese Patent No. 6657, a DC system including a converter is provided between AC power systems in place of such an energy storage device, power fluctuations of a power system to which the converter is connected are detected, and a fluctuation is detected. There has already been proposed a control device that stabilizes the AC system by controlling the DC power transmission by means of the above.

In addition, as equipment for storing electric power,
For example, according to Japanese Patent Laid-Open No. 5-300658, a power storage device is provided in a direct current system interposed between two alternating current systems, and when these alternating current systems are healthy, electric power is stored. If an accident occurs in the AC system,
It is already known to control to send or absorb electric power.

[0005]

However, in the above-mentioned conventional technique, in particular, in the stabilization control method of the electric power system disclosed in Japanese Patent Laid-Open No. 5-316657, the converter converted electric power of the DC power transmission equipment is changed to change the system. When suppressing the power fluctuation, the converted power of the other converter also fluctuates via the DC transmission line. Therefore, in the electric power system to which the other converter is connected, there is a drawback that the electric power fluctuation may be enlarged. Further, it has been pointed out that if the converter conversion power is temporarily reduced due to a failure of the AC system or a failure of the DC system, it causes a power fluctuation in the AC system. Furthermore, in the power transmission equipment and the power storage equipment used for the equipment known from the above-mentioned Japanese Patent Laid-Open No. 5-300658, the main focus is on the storage of electric power, which is a problem in the prior art as described above. It does not eliminate power fluctuations and eliminates them.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional method, that is, to stabilize the power system to which each converter of the DC power transmission equipment is connected, and at the same time. An object of the present invention is to provide a power system stabilizing device in a power system system that can minimize the effect on the system even when the transmitted power of the DC power transmission facility temporarily changes.

[0007]

SUMMARY OF THE INVENTION The present invention provides at least two
In a power system stabilizing device of a power system system in which a DC power transmitting device is connected between two AC power systems, and the AC power system is stabilized by power conversion by the DC power transmitting device, the DC power transmitting device is one of A first power converter connected to the bus of the AC power system, a second power converter connected to the bus of the other AC power system, and a DC linking between the first and second power converters. And a power storage device that works by emphasizing the DC power transmission device, the power storage device being connected to one of the AC power transmission lines interconnecting the power conversion device and the AC system. A power system stabilizing device for a power system system is proposed.

Further, in the electric power system stabilizing device in the electric power system of the present invention, there is provided a power absorption / emission control device for controlling the absorption / emission power of the power storage device in accordance with the fluctuation of the power flow of the AC transmission line. Something has been proposed.

Further, in the electric power system stabilizing device in the electric power system of the present invention, the absorption / emission power by the electric power storage device is generated based on the fluctuation of the DC power converted from the one AC system by the DC power transmission device. A device provided with a power absorption / emission control device for controlling has been proposed.

In addition, in the electric power system stabilizing device in the electric power system of the present invention, a first electric power fluctuation suppressing device for forming a DC power control command for suppressing electric power fluctuation of the one AC system is provided. It is proposed that the electric power absorption / emission control device is configured to control the electric power absorption / emission power by the power storage device based on a DC power control command from the first power fluctuation suppressing device.

In the power system stabilizing device in the power system of the present invention, further, a second power fluctuation suppressing device for forming a DC power control command for suppressing power fluctuation of the other AC system. And the power absorption / release control device controls the power storage device based on a DC power control command from the first power fluctuation suppressing device and a DC power control command from the second power fluctuation suppressing device. It has been proposed to be configured to control the power absorbed and released.

Further, in the power system stabilizing device in the power system of the present invention, the first AC power value detecting means for detecting the AC power value of the first AC system is provided, and the first power fluctuation is provided. The suppression device is configured to form a DC power control command for suppressing power fluctuation of the first AC system based on the AC power detection value detected by the first AC power value detection means, In addition, second AC power value detecting means for detecting the AC power value of the second AC system is provided, and the second power fluctuation suppressing device is detected by the second AC power value detecting means. There has been proposed one that is configured to form a DC power control command that suppresses the power fluctuation of the second AC system based on the detected AC power value.

Further, in the electric power system stabilizing device in the electric power system of the present invention, the first electric power fluctuation suppressing device is provided between the first electric power fluctuation suppressing device and the electric power intake / discharge control device. It has been proposed to provide signal transmission means for transmitting the generated DC power control command to the power absorption / emission control device.

In the electric power system stabilizing device in the electric power system of the present invention, the deviation from the deviation calculating means is transmitted to the electric power intake / discharge control device between the deviation calculating means and the control device. It has been proposed to provide a signal transmission means for doing so.

Further, in the power system stabilizing device in the power system system of the present invention, the power fluctuation of the second AC system is based on the AC power supplied from the DC power transmitting device to the second AC system. It has been proposed to provide a power fluctuation suppression control unit that generates a power fluctuation suppression output that suppresses

In the electric power system stabilizing device in the electric power system of the present invention, a converter operating state detecting section for detecting the electric power converting operation of the DC power transmitting device is provided.
It has been proposed that the converter operation state detection unit is configured to interrupt the power absorption / release command output from the power fluctuation suppression control unit based on the power conversion operation state of the DC power transmission device.

In the electric power system stabilizing device in the electric power system of the present invention, the converter operation state detecting section further includes an abnormality detecting means for detecting a failure or an operation abnormality of the converter of the DC power transmitting device. It is proposed that the power absorption / emission control device is configured to control the absorption / emission power by the power storage device according to a failure or an operation abnormality of the converter detected by the abnormality detection means. .

According to an embodiment of the present invention, in the electric power system stabilizing device in the electric power system of the present invention, means for detecting a stop state of the electric power storage device, and the electric power storage device stoppage It has been proposed to provide means for limiting the amount of power conversion by the power converter based on a detection signal from the state detecting means.

In the power system stabilizing device of the power system system of the present invention, the power storage device is capable of absorbing and releasing electric power by exciting the rotor with alternating current. A secondary battery capable of absorbing and releasing electric power, a superconducting energy storage device equipped with a power converter for controlling electric power between a superconducting coil and an electric power system, an AC excitation type in which a reversible pump turbine is connected to a rotor. One of the variable speed pumped storage generators of at least one has been proposed.

As described above, by controlling the AC / DC converter and the power storage device in cooperation with each other, it becomes possible to perform independent control for different power fluctuation modes at both ends of the DC transmission line. Can be efficiently stabilized. That is, this means that the same stabilizing effect can be obtained as the independent energy absorption / emission control device is installed in each system at both ends of the DC power transmission facility.

Further, by controlling the output of the power storage device in cooperation with the converted power of the DC converter, the DC converted power may be caused by a cause such as a failure of the DC transmission line or a failure of the AC system near the converter. Is temporarily reduced, it is possible to compensate for the reduced conversion power and reduce the adverse effect on the AC system.

[0022]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an example of a case where the power system stabilizing device according to the present invention comprises a DC power transmitting device 9 and power storage equipment.
In this figure, a generator 11, a bus 12, a power transmission line 13,
The first AC system 10 including the load 14 and the second AC system 20 including the generator 21, the bus 22, the power transmission line 23, the load 24, and the like include the above-described DC power transmission device 9 and the power transmission line. It is connected via 4 and 6. The DC power transmission device 9 includes a first power converter 1, a second power converter 2, and a DC line 3, and each power converter is a converter control device 3.
DC transmission power Pd which is controlled respectively by 1 and 32
Keep c at the commanded value. The command value Pdc of the DC transmitted power to each power converter is such that the command value in the steady state (DC power command value) PO suppresses the AC power fluctuation when the power fluctuation occurs in the first AC system. Add a command value (power fluctuation suppression control signal) ΔPdc for DC power control (Pd
c = PO + ΔPdc). Further, the power detector 15 installed in the first AC system detects the power value of the system, and the power fluctuation suppression control device 33 creates a power fluctuation suppression control signal ΔPdc based on this signal. That is, the DC power is changed in accordance with the ΔPdc signal, so that the power fluctuation of the first AC system can be suppressed.

On the other hand, a power storage device 7 is installed on the bus bar 5 installed between the power transmission line 4 and the power transmission line 6 described above. The electric power storage device 7 is controlled by its electric power (P) absorption / emission control device 41. Further, the power command value Pes to the power (P) absorption / release control device 41
Is set to the normal power (P) absorption / release command value PesO
Of the power fluctuation suppression control device 33 that suppresses the power fluctuation when the power fluctuation occurs in the AC system, and further decreases the output value ΔPdc of the power fluctuation suppression control device 33 of the DC power transmission device 9. Created in.

That is, the power detector 25 installed in the second AC system detects the power value of the system, and the power fluctuation suppression control device 42 creates the control signal ΔPes based on this signal. Then, the electric power (P) absorption / release command value PesO is set to ΔP
By adding es, the absorption / emission power of the power storage device 7 is controlled so as to suppress the power fluctuation of the second AC system 20. Further, by reducing ΔPdc, the power flow P flowing from the second converter 2 of the DC power transmission device 9 to the second AC system is reduced.
The fluctuation of ac can be reduced. The above △
The Pdc signal is formed by transmitting the output (ΔPdc) from the power fluctuation suppression control device 33 that controls the DC power transmission device 9 to the control device of the power storage device 7 by the information transmission device 50. This information transmission device 50
As is clear from the figure, the transmitter 51 and the receiver 5
2, a signal transmission path 53, and a transmitter 5
A signal is transmitted between 1 and the receiver 52 via a signal transmission path 53. As the information transmission device 50, for example, a communication device using an optical cable or a communication device using a microwave may be used, or when the power storage device 7 and the DC power transmission device 9 are sufficiently close to each other, the information transmission device 50 may be directly connected. A signal line may be installed.

As described above, by operating the DC power transmission device 9 and the power storage device 7 in cooperation with each other, the influence of changing the DC power Pdc so as to reduce the power fluctuation of the AC system is different from that of the other AC system. It is possible to suppress the influence on. That is, in order to suppress the power fluctuation of the first AC system, the DC power transmission device 9 is controlled by the power fluctuation suppression control device 3
Although it is necessary to change the DC power Pdc according to the command of No. 3, the power Pac converted from the DC power transmission device 9 to the second AC system 2 also fluctuates, and the second AC system 2 is changed. May have adverse effects. Therefore, by canceling this power fluctuation using the power control function of the power storage device 7, the DC power transmission device 9 can change the DC power Pdc without adversely affecting the second AC system. . In addition, the power storage device 7 is connected to the second AC system 2
By operating so as to suppress the power fluctuation of
It is possible to independently suppress power fluctuations in the second AC system.

In the above embodiment, the DC power P
Although it has been described that dc is used, a DC voltage or a DC current can be used instead of the DC power Pdc. That is, when the DC current is constant, the DC voltage behaves similarly to the DC power Pdc, and when the DC voltage is constant, the DC current is the DC power Pdc.
By showing a movement similar to dc. In addition, the effective value of the AC voltage at either converter end can also be used because it shows the same movement as DC power if the AC current is constant when the converter operates normally. . Furthermore, the RMS value of the AC current at either end of the converter also behaves like DC power if the AC voltage is constant when the converter operates normally, so use these as well. You can also

Further, instead of directly detecting the DC power Pdc, it is possible to estimate the DC power Pdc from other detection signals. For example, if the DC current can be regarded as constant, the DC voltage may be detected and used instead of the DC power Pdc. Similarly, if the DC voltage can be regarded as constant, the DC current may be detected and used instead of the DC power Pdc. Also, it may be estimated from the AC voltage or AC current near the converter end or the power storage device installation point, or from the frequency fluctuation or phase fluctuation of the AC voltage or AC current near the converter end or the power storage device installation point. It may be estimated. Furthermore,
When the converter constituting the DC power transmission device 9 is a separately excited converter, it is estimated from the firing control angle or the phase margin angle, or when the converter is a self-excited converter, the converter voltage is calculated. It is also possible to estimate it from the command value or the actual measurement value of the magnitude or the phase.

Next, FIG. 2 shows an example of the operation of each device in the power system stabilizing device shown in FIG. First, the converted electric power Pac of the converter 2 of the DC power transmission device 9 is Δ
Consider a case in which Pdc is added to change as shown in the graph of FIG. Here, it is assumed that the power storage device 7 is provided with the fluctuation suppression control command value ΔPes as shown in the graph of FIG. 2C in order to suppress the fluctuation of the power of the second AC system 2. In this case, the power storage device 7 includes the converter 2
2 (b) in order to perform desired power control on the second AC system 2 while offsetting the fluctuations in the converted power Pac of
Electric power is absorbed and released like Pes shown in the graph. Thereby, the line power Pline to the second AC system 2 is
As shown in the graph of FIG. 2C, a waveform obtained by adding Pac and Pes (Pac + Pes) is obtained, and the power fluctuation as instructed by the power fluctuation suppression control device 42 is obtained. Here, the direction of the power flow is the positive direction of the arrow shown in FIG.
The output direction of the power storage device is positive when the power is discharged from the power storage device 7 to the bus 5 of the system.

In the above-mentioned FIG. 1, the output ΔP of the power fluctuation suppressing control device is used as the signal transmitted to the power storage device 7.
Although dc is used, any other signal may be used as long as this signal represents a fluctuation of DC power. For example, as shown in FIG. 3, the converted power Pac of the second converter 2 is detected by the power detector 8 and the deviation from the DC power command value PO is Δ.
By transmitting it as Pdc (ΔPdc = Pac−PO) to the power storage device 7, the same effect as that of the device shown in FIG. 1 can be obtained. Further, in this case, when the converter cannot operate normally and the converted power decreases due to a system failure such as a lightning strike in the AC system or the DC system, the power supplied from the DC power transmitting device 9 to the AC system decreases. It is also possible to supplement the amount by the power storage device 7.

FIG. 4 shows an example of the operation of each device when the control device shown in FIG. 3 is used. Consider a case where the conversion power Pac of the second converter 2 fluctuates as shown in the graph of FIG. 4A due to some disturbance to the system.
Here, it is assumed that the vibration suppression control command value ΔPes is always zero (0) as shown in the graph of FIG. Therefore, the electric power supplied from the converter 2 to the AC system 2 temporarily decreases. At this time, the amount of decrease in power is the deviation ΔPdc between the AC power Pac and the DC power command value PO.
(= Pac-PO), and the output of the power storage device 7 is controlled based on this signal as shown in the graph of FIG. As a result, the power supply P to the AC system 2
The fluctuation of the line can be suppressed to almost zero (0) as shown in the graph of FIG. Here, the direction of the power flow is positive in the direction of the arrow shown in FIG. 1, and the direction of the output of the power storage device is positive in the direction of discharging power from the power storage device 7 to the bus 5 of the grid.

Next, FIG. 5 shows a configuration in which no signal is transmitted between the DC power transmission device 9 and the power storage device 7. The power Pac supplied from the DC power transmission device 9 to the AC system 2 is detected by the power detection device 8 and becomes an input signal of the power fluctuation suppression control unit 60. The output of the power fluctuation suppression control unit 60 is added to the power (P) absorption / release command value PesO of the power storage device 7, and the output of the power storage device 7 is controlled so as to cancel the fluctuation of the line power. With such a configuration, even if the converted power of the DC power transmission device 9 suddenly changes, the fluctuation of the power supplied to the AC system 2 can be suppressed. That is, the power fluctuation suppression control unit 60 can be configured by, for example, the reset filter 61, the phase compensation block 62, the low-pass filter 63, and the gain block 64. According to such a configuration, the reset filter 61 accounts for fluctuations in power. Then, the phase compensation block 62 and the low pass filter 63 perform transmission delay compensation and high frequency removal. Further, the gain of the gain block 64 may be adjusted according to the system state and the like, and this gain needs to be a negative value.

As described above, the power storage device 7 is installed on a line in which the line power fluctuates due to the power fluctuation of the DC power transmission equipment 9, and the control is performed according to the fluctuation of the line power, thereby performing the DC power transmission. Even without transmitting a signal between the facility 9 and the power storage device 7, it is possible to reduce the influence of the power fluctuation of the DC power transmission device 9 and the temporary conversion power drop on the AC system. . Further, if the installation location of the power storage device 7 is installed on the bus in the converter station where the converter 2 is installed, the communication equipment can be simplified, the delay of signal transmission is small, and the DC transmission power fluctuation is most effective. The influence of can be reduced.

The control method of the power storage device 7 may be changed according to the operating state of the DC power transmission device 9. For example, as shown in FIG. 6, the converter operation state detection unit 34 detects the operation state of the converter of the DC power transmission device 9, and when the converter is stopped, the operation of the power fluctuation suppression control unit 60 is stopped. By doing so, unnecessary operation of the power storage device 7 can be avoided. Alternatively, an abnormality detection device for detecting a failure or operation abnormality of the DC power transmission device 9 is provided, and according to the type of abnormality detected by this abnormality detection device,
Electric power (P) for controlling the absorption / emission power of the electric power storage device 7
It is also possible to change the control of the absorption / emission control device 41.

In addition, for example, when the power storage device 7 is in a stopped state or the power controllable by the DC power transmission device 9 is limited, a device for detecting this is provided, and A control device for limiting the power fluctuation suppression control using the DC power transmission device 9 may be provided according to the state detected by the detection device.

It should be noted that the converter of the DC power transmission device described above has the same effect whether it is a self-excited converter, a separately excited converter, or a combination thereof. Further, the same effect can be obtained regardless of whether the first and second AC systems are separated or connected by the AC system.

Here, a specific example of a device applicable as the power storage device 7 will be described. In Figure 7,
An example of a device using a superconducting coil as the power storage device 7 will be shown. In the figure, the converter 7 is attached to the superconducting coil 72.
1 is connected to control the converter 71 to adjust the amount of current flowing through the superconducting coil. As a result, it becomes possible to transfer power to and from the AC system bus bar 5 via the step-up transformer 70.

Further, FIG. 8 shows an example of a device using a secondary battery as the power storage device 7. Ie 2
By connecting the secondary battery 74 to the converter 73 and controlling the converter 73, it is possible to transfer power to and from the AC system bus 5 via the step-up transformer 70. Note that this 2
As the secondary battery, for example, a battery capable of charging / discharging electric power, such as a lead storage battery, a NaS battery, a nickel-cadmium battery, or a lithium battery may be used.

FIG. 9 shows an example of another device using the variable speed synchronous machine as the power storage device 7. Here, the variable speed synchronous machine can store electric power by controlling the phase of the secondary excitation voltage and storing it as rotational energy of the rotor. That is, as illustrated, the variable speed synchronous machine 8
Reference numeral 1 includes a stator 82 and a rotor 83, and the three-phase primary winding of this stator 82 is connected to the AC system bus 5 via a step-up transformer 70. A flywheel 84 is connected to the rotor 83. In the variable speed synchronous machine having such a configuration, the three-phase secondary winding 85 (a, b, c) of the rotor 83 is AC-excited by the excitation controller 88. The excitation control device 88 includes an excitation amount setting means 87 and a phase conversion means 86 (a, b, c). Then, the excitation amount setting means 87 sets the excitation amount of the rotor 82 according to the active power command value so that the output of the variable speed synchronous machine 81 matches the command value. The flywheel 84 is connected for the purpose of increasing the amount of energy stored in the rotor 3, but is not particularly necessary if the rotor 3 alone can store sufficient energy. Also, this flywheel 8
Instead of 4, even with a variable speed pumped-storage generator with a turbine connected,
Similar to the above, it is possible to absorb and release electric power, and again, it can function as an electric power storage device in the electric power system stabilizing device of the present invention.

[0039]

As is clear from the above detailed description, according to the power system stabilizing device in the power system of the present invention, the power system using the DC power transmission equipment as the means for absorbing and discharging the AC active power is used. In the system, it is possible to stabilize the power system without expanding the power fluctuation to any of the power systems to which the converter of the DC power transmission equipment is connected. Even if the converter conversion power is temporarily reduced due to a failure of the DC system, it is possible to minimize the effect on the system, and it is possible to exert an extremely excellent effect technically. Become.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a power system system to which a power system stabilizing device according to the present invention is applied.

FIG. 2 is a waveform diagram for explaining a power system stabilizing operation in the power system stabilizing device.

FIG. 3 is a partial configuration diagram illustrating a power system stabilizing device according to another embodiment of the present invention.

FIG. 4 is a waveform diagram illustrating a power system stabilizing operation of a power system stabilizing device according to another embodiment.

FIG. 5 is a configuration diagram illustrating a power system stabilizing device according to still another embodiment of the present invention.

FIG. 6 is a configuration diagram illustrating a power system stabilizing device according to still another embodiment of the present invention.

FIG. 7 is a diagram showing a specific configuration example of a power storage device in the power system stabilizing device according to the present invention.

FIG. 8 is a diagram showing another specific configuration example of the power storage device in the power system stabilizing device according to the present invention.

FIG. 9 is a diagram showing still another specific configuration example of the power storage device in the power system stabilizing device according to the present invention.

[Explanation of symbols]

 1 1st power converter 2 2nd power converter 3 DC line 4, 6, 13, 23 Power transmission line 5, 12, 22 Bus 7 Power storage device 8, 15, 25 Power detector 9 DC power transmission equipment 10th 1 AC system 11, 21 Generator 14, 24 Load 20 First AC system 31, 32 Converter control device 33 Power fluctuation suppression control device 34 Converter operating state detection unit 41 Power absorption / release control device 42 Power fluctuation suppression control Device 50 Information transmission device 51 Transmitter 52 Receiver 53 Signal transmission path 60 Power fluctuation suppression control unit 61 Reset filter 62 Phase compensation block 63 Low-pass filter 64 Gain block 70 Boost transformer 71, 73 Converter 72 Superconducting coil 74 Secondary battery 81 Variable Speed Synchronous Machine 82 Stator 83 Rotor 84 Flywheel 85 Secondary Winding 86 Phase Converter 8 Excitation amount setting means 88 excitation control device

Claims (16)

[Claims] 1. A power system stabilizing device for a power system, wherein a DC power transmitting device is connected between at least two AC power systems, and the AC power system is stabilized by power conversion by the DC power transmitting device. The DC power transmission device includes a first power conversion device connected to a bus bar of one AC power system, a second power conversion device connected to a bus line of the other AC power system, and the first and second power conversion devices. A power storage device that is configured by a DC power transmission line that connects between power conversion devices, and further works on one side of the AC power transmission line that links between the power conversion device and the AC system by emphasizing the DC power transmission device. A power system stabilizing device for a power system, which is characterized in that 2. The electric power system stabilizing device for the electric power system according to claim 1, wherein the electric power absorption / emission control unit controls the absorption / emission power of the power storage device in accordance with fluctuations in the power flow of the AC transmission line. A power system stabilizing device for a power system, comprising a control device. 3. The power system stabilizing device for a power system according to claim 1, wherein the power storage device absorbs power based on a change in DC power converted from the one AC system by the DC power transmitting device. An electric power system stabilizing device for an electric power system, comprising an electric power absorption / emission control device for controlling emitted power. 4. The power system stabilizing device for a power system according to claim 3, wherein the first power fluctuation suppressing device forms a DC power control command for suppressing power fluctuation of the one AC system. And the power absorption / release control device is configured to control the absorption / discharge power by the power storage device based on a DC power control command from the first power fluctuation suppressing device. Power system stabilizer for power system. 5. The power system stabilizing device for a power system according to claim 4, wherein the second power fluctuation suppressing device forms a DC power control command for suppressing power fluctuation of the other AC system. And the power storage and release control device is configured such that the power storage device is based on a DC power control command from the first power fluctuation suppressing device and a DC power control command from the second power fluctuation suppressing device. A power system stabilizing device for a power system, wherein the power system stabilizing device is configured to control the power absorbed and released by the power system. 6. The power system stabilizing device for a power system according to claim 5, further comprising: first AC power value detecting means for detecting an AC power value of the first AC system; The power fluctuation suppressing device of the present invention forms the DC power control command for suppressing the power fluctuation of the first AC system based on the AC power detection value detected by the first AC power value detecting means. In addition, a second AC power value detecting means for detecting an AC power value of the second AC system is provided, and the second power fluctuation suppressing device is configured by the second AC power value detecting means. A power system stabilizing device for a power system, which is configured to form a DC power control command for suppressing power fluctuation of the second AC system based on the detected AC power detected value. . 7. The power system stabilizing device for a power system according to claim 4, wherein the first power fluctuation is provided between the first power fluctuation suppressing device and the power intake / discharge control device. A power system stabilizing device for a power system, comprising signal transmission means for transmitting a DC power control command generated by a suppressing device to the power absorption / emission control device. 8. The power system stabilizing device for a power system according to claim 3, wherein the power value of the AC power converted by the DC power transmitting device is detected by the AC power detecting device. Means for calculating a deviation between the electric power value and the DC power converted by the DC power transmission device is provided, and the power absorption / emission control device is configured to absorb / discharge the power storage device based on the deviation from the deviation calculation means. An electric power system stabilizing device for an electric power system, which is configured to control electric power. 9. The electric power system stabilizing device for the electric power system according to claim 8, wherein a deviation from the deviation calculating means is provided between the deviation calculating means and the control device. A power system stabilizing device for a power system, comprising a signal transmitting means for transmitting to a device. 10. The power system stabilizing device for a power system according to claim 1, wherein the power storage device absorbs power based on the AC power supplied from the DC power transmitting device to the second AC system. An electric power system stabilizing device for an electric power system, comprising an electric power absorption / emission control device for controlling emitted power. 11. The power system stabilizing device for the power system according to claim 10, wherein the second AC system is based on the AC power supplied from the DC power transmitting device to the second AC system. An electric power system stabilizing apparatus for a power system, comprising a power fluctuation suppressing control unit that generates a power fluctuation suppressing output that suppresses the power fluctuation of the electric power system. 12. The power system stabilizing device for a power system according to claim 11, further comprising means for detecting an AC output from the second power converter forming the DC power transmitting device, The fluctuation suppression control unit is configured to form a power absorption / release command that suppresses a power fluctuation of the second AC system, based on the power detection value detected by the AC power value detection unit. The power system stabilizer of the characteristic power system. 13. The power system stabilizing device for a power system according to claim 12, further comprising a converter operating state detecting unit for detecting a power conversion operation of the DC power transmitting device, the converter operating state detecting unit. An electric power system stabilizing device for an electric power system, wherein the electric power absorption / emission command output from the electric power fluctuation suppression control unit is configured to be intermittent based on the electric power conversion operation state of the DC power transmission device. 14. The power system stabilizing device for a power system according to claim 13, wherein the converter operation state detecting unit detects an abnormality or an operation abnormality of a converter of the DC power transmission device. The electric power absorption / emission control device is configured to control the electric power absorption / emission power by the power storage device according to a failure or an operation abnormality of the converter detected by the abnormality detection means. Power system stabilizer for power system. 15. The power system stabilizing device for a power system according to claim 1, wherein the power storage device has a unit for detecting a stop state of the power storage device, and a detection signal from the power storage device stop state detection unit. And a means for limiting the amount of power conversion by the power converter based on the above. 16. A power system stabilizing device for a power system according to claim 1, wherein the power storage device is capable of absorbing and releasing electric power by exciting the rotor with alternating current. A synchronous machine, a secondary battery capable of absorbing and releasing electric power, a superconducting energy storage device including a superconducting coil and a power conversion device for controlling electric power between electric power systems, and a rotor connected to a reversible pump turbine. At least one of the following AC-excited variable speed pumped storage generators
An electric power system stabilizing device for an electric power system, which is configured by two.