JP2022109882A - Electric power system management device and electric power system management method - Google Patents

Abstract

To provide an electric power system management device and an electric power system management method that can appropriately monitor and operate an electric power system.SOLUTION: An electric power system management device has: acquisition means 12 that acquires output values from components connected to an electric power system; stability calculation means 12 that, based on the output values from the components acquired by the acquisition means 12, calculates a static stability index indicating the static stability of the electric power system; and display means 12 that displays the static stability index calculated by the stability calculation means 12. The stability calculation means 12 calculates a static stability index in the present configuration of the electric power system and a static stability index when the configuration of the electric power system is changed. The display means 12 draws displays indicating the static stability index in the present configuration of the electric power system and display indicating the static stability index when the configuration of the electric power system is changed, and displays them in a superimposed state.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power system management device and a power system management method for monitoring and operating a power system.

Conventionally, synchronous generators such as thermal power generation, nuclear power generation, and hydroelectric power generation, which have been the mainstream of power generation, rotate in synchronization with the frequency of the power system. It is known that even if the phase difference angle advances (or delays), a synchronizing force acts so as to return to the original operating state. Alternately, it is possible to shift to a different stable operating state by using synchronization power even in response to power supply and demand fluctuations due to changes in the load (demand) in the power system, or changes in interconnection reactance due to transmission line outages, etc. Are known. In addition, the synchronous generator has an inertial force, which mitigates abrupt changes in transient phenomena such as transmission line failures, and maintains the stability of the power system through appropriate control by protective relays and the like.

As a technology to combat global warming and realize a decarbonized society, there is a renewable energy power source, and various renewable energies such as small hydroelectric power generation, solar power generation, wind power generation, geothermal power generation, and tidal and wave power generation. related power generation technology is being developed. In addition, the use of storage batteries is also progressing as a technology that contributes to the adjustment of power supply and demand. Many of these renewable energy power sources and storage batteries are connected to the power grid via inverters (converters).
Many renewable energy power sources and storage batteries are connected to the power grid via inverters, and unless special control is performed, they do not have the above synchronization force and inertia force, so the ratio of renewable energy power sources to the total power supply There is concern that an increase in the power system will reduce the synchronizing force and inertial force of the entire system, making it impossible to maintain the stability of the power system.
In particular, in relatively depopulated areas such as rural areas, renewable energy power generation such as solar power and wind power generation is increasing, but power demand is decreasing, and power networks are weaker than urban areas. As a result, the frequency of reverse power flow, in which power is sent from a renewable energy source back up the transmission line to another area, is increasing, and the amount of power in the reverse power flow is also increasing.

Therefore, it is possible to visualize the stability and transmission limit of the power system in real time, including power demand, the amount of connected renewable energy sources, power line accidents, equipment stoppages for inspection, and changes in the power system configuration. , by diagnosing and monitoring, changing the operation plan, implementing measures to ensure stability by resupplying (switching) the power supply, etc., and implementing safe and secure power network operation.
For example, in Patent Document 1, the terminal voltage, active power, reactive power, and system voltage of a synchronous machine are used to display the latest stability margin with an illustration image that makes it easy to visually judge, and the stability margin becomes low. In addition, by inputting simulated data for changing the configuration of the power system before changing the operating state of the synchronous machine or changing the circuit configuration of the power system, the power system can be stabilized after the change. It is disclosed to present a degree.

JP-A-5-316656

However, in Patent Document 1, in order to present the stability when the configuration of the power system is changed, it is necessary to input simulated data after changing the configuration of the power system. It is not possible to compare the steady-state stability limit of the power system with the steady-state stability limit of the current configuration of the power system in real time. There was a problem that the administrator could not quickly grasp the index for determining whether the change should be made and measures to ensure stability such as re-supply of the power supply should be executed.

An object of the present invention is to provide a power system management device and a power system management method capable of appropriately monitoring and operating a power system.

A power system management apparatus according to the present invention includes acquisition means for acquiring an output value of each component connected to a power system; a stability calculation means for calculating a steady-state stability index indicating stability; and a display means for displaying the steady-state stability index calculated by the stability calculation means, wherein the stability calculation means is , calculating the steady-state stability index in the current configuration of the power system and the steady-state stability index when the configuration of the power system is changed, and the display means displays the current configuration of the power system A display showing the steady-state stability index and a display showing the steady-state stability index when the configuration of the electric power system is changed are drawn and superimposed for display.
Further, the acquisition means, which has a notification means and acquires the output value of each component connected to the power system, obtains the power generation value of a predetermined generator of the power system and the specified remote power station (equivalent to an infinite bus). It consists of a means to measure and transmit the relationship with the reference phase difference angle and a transmission means to measure the power generation amount of the renewable energy power source and the demand load status, and the stability calculation means is displayed on one screen or integrated. Based on the visualized information, the index for the administrator to take measures to ensure stability is displayed by superimposing the predicted value from the current value, and the notification means indicates that the steady-state stability is less than or equal to a predetermined value. Notification can be made when
The stability calculation means calculates the steady-state stability index in the current configuration of the power system and the steady-state stability index when the configuration of the power system is changed, and the display means calculates the power A display showing the steady-state stability index in the current configuration of the power system and a display showing the steady-state stability index when the configuration of the power system is changed are drawn and superimposed for display.
In the above electric power system management device, the stability calculation means uses, as the steady-state stability index, a power generation value (hereinafter referred to as power value) of a predetermined generator in the electric power system, which is specified as a remote electric station (to an infinite bus). equivalent), and the display means calculates the power phase difference angle curve in the current configuration of the power system and the power phase difference angle curve as the steady state stability index. It is possible to draw and superimpose a power phase difference angle curve when the system configuration is changed.
Further, as the steady-state stability index, the current power value and phase difference angle of the predetermined generator and the steady-state stability limit, which is the peak value of the power phase difference angle curve, are calculated, and the display means Further, as the steady-state stability index, a display showing the current power value and the phase difference angle of the predetermined generator, a display showing the steady-state stability limit in the current configuration of the power system, and the power system A display showing the steady state stability limit when the configuration of is changed can be drawn and superimposed for display.
With respect to changes in the configuration of the power system, a steady-state stability index is calculated when the output values of some components connected to the power system are changed, and the display means changes the configuration of the power system. Instead of the steady state stability index when the power system is changed, or in addition to the steady state stability index when the configuration of the power system is changed, the output value of some components connected to the power system is changed. The steady state stability index when the power system is set to be superimposed on the steady state stability index in the current configuration of the power system can be displayed.
For this reason, a database in which system constants are stored in advance is provided. and, based on the system constant stored in the database, the output value of the component for which the output value cannot be obtained is estimated, and the steady state stability index is calculated using the estimated output value can do.
In the above power system management device, the acquisition means acquires the output value and output time information from each component of the power system, and the stability calculation means calculates based on the output value output at the same time , to calculate the steady-state stability index.
In the power system management device, the steady state stability in the current configuration of the power system and the steady state stability when the configuration of the power system is changed are determined, and the steady state stability in the current configuration of the power system is determined. The power system may further include an informing means for informing when the degree of stability or the steady-state stability when the configuration of the electric power system is changed is equal to or less than a predetermined value.
In the above power system management device, the reporting means determines the steady state stability of the power system based on the steady state stability margin, the synchronization force margin, or the inertia constant of the power system based on the oscillation frequency. can be configured to
A power system management method according to the present invention acquires an output value of each component connected to a power system, and based on the acquired output value of the component, a steady state stability indicating a steady state stability of the power system. A power system management method for calculating a stability index and displaying the calculated steady state stability index, wherein the steady state stability index in a current configuration of the power system and when the configuration of the power system is changed and the steady state stability index in the current configuration of the power system and the steady state stability index in the case where the configuration of the power system is changed are superimposed and displayed. .
In this way, the present invention predicts the steady-state stability due to the effects of electrical changes such as increased power generation and decreased demand for renewable energy sources, and suspension of power transmission lines, and the effects on stability. Based on this, it is characterized by geometrically superimposing the current steady-state stability and visually expressing it.

According to the present invention, the current steady-state stability of the power system and the steady-state stability when the configuration of the power system is changed are superimposed and visually displayed so that the administrator can understand the power system can be properly monitored and operated.

1 is a configuration diagram of a power system management device according to this embodiment; FIG. It is a figure which shows an example of a structure of the electric power system which concerns on this embodiment. It is a figure which shows the other example of a structure of the electric power system which concerns on this embodiment. FIG. 5 is a diagram showing an example of a graph in which a power phase difference angle curve in the current configuration of the power system according to the present embodiment and a power phase difference angle curve when the configuration of the power system is changed are superimposed. 4 is a flowchart showing power management processing according to the embodiment; 1 is a diagram showing a configuration of a power system according to Example 1; FIG. 1 shows a part of a power phase difference angle curve C1 calculated using actual measurements and a part of a power phase difference angle curve C2 when the power system configuration is partially changed in the power system configuration of the first embodiment. graph. FIG. 10 is a diagram showing the configuration of a power system in Example 2; 8 is a graph obtained by using actual measurements of changes in the active power value and the phase difference angle when the power transmission line is stopped in Example 2. FIG. 7 is a graph obtained by using actual measurement values of changes in the active power value and the phase difference angle when the power generation amount of the generator is increased in Example 2. FIG. 10 is a graph obtained by using actual measurement values of changes in the active power value and the phase difference angle when the stopped power transmission line is restarted in Example 2. FIG. 10 is a graph obtained by changing the constituent elements based on Example 1 and obtaining the active power value and the phase difference angle when increasing the power generation amount of an existing generator in Example 3. FIG.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, a power system to be managed will be referred to as a "target power system", and a power system management apparatus for allowing the administrator to grasp the steady-state stability of the target power system will be described as an example. In addition, hereinafter, synchronous generators such as nuclear power, thermal power, and hydroelectric power are simply referred to as "generators", and renewable energy sources such as solar power and wind power and power systems via inverters such as storage batteries. Connected devices are collectively referred to as "renewable energy power sources" or "renewable energy power sources." Further, generators, renewable energy sources, stations and loads that connect to the power system are also collectively referred to simply as "components." In addition, when dealing with the phase difference angle inside the generator, it may be called an internal phase difference angle and used properly, but in this embodiment, it will be referred to as a "phase difference angle".

FIG. 1 is a configuration diagram of a power system management device 10 according to this embodiment. As shown in FIG. 1, the power system management device 10 according to the present embodiment includes a communication device 11, an arithmetic device 12, a storage device 13, a database 14, a display device 15, a notification device 16, and an input device 17. and have

The arithmetic device 12 executes a program stored in the storage device 13 to obtain a system constant in the target power system and an output value of each component of the target power system, and an acquisition function of each component of the power system. A stability calculation function that calculates the steady-state stability index of the power system based on the output value of the power system, a display function that displays the steady-state stability index calculated by the stability calculation function, and the steady-state stability of the power system and an informing function of judging and informing when the steady-state stability is low. Each function of the arithmetic unit 12 will be described below.

The acquisition function of the arithmetic unit 12 acquires system constants in the target power system. In this embodiment, system constants such as the impedance of transmission lines and transformers, generators and internal constants of generators are stored in advance in the database 14, and the acquisition function acquires these system constants of the target power system from the database 14. can be obtained from In addition, in this embodiment, the output values such as the voltage value, current value, and generated power value (hereinafter referred to as power value) of each component of the power system (generator, renewable energy power source, electrical station, load, etc.) are It is measured by a measuring device connected to the target power system, and the output value measured by the measuring device is transmitted to the power system management device 10 . Thereby, the acquisition function can acquire the output value of each component of the power system via the communication device 11 . In addition, in the present embodiment, the acquisition function acquires GPS information including output time information in addition to the output value of each component of the power system from each measuring device connected to the target power system. Information on the time when the output value of the element was output can also be obtained.

Here, FIG. 2 is a diagram showing an example of the configuration of the target power system according to this embodiment. In the target power system shown in FIG. 2, a generator G, a renewable energy power source P and an infinite bus IB are connected via transmission lines L1 and L2. In this case, the acquisition function can acquire the complex impedance r ₁ +jx ₁ of the transmission line L1 and the complex impedance r ₂ +jx ₂ of the transmission line L2 from the database 14 as system constants of the target power system. In addition, the acquisition function obtains the voltage value V _G and current value I _G of the generator G, the voltage value V _P of the renewable energy power supply P, the voltage value V _IB of the infinite bus IB via the communication device 11, the target electric power It can be obtained from a measuring device (not shown) connected to the system.

The stability calculation function of the arithmetic device 12 calculates a steady-state stability index of the target power system. Specifically, the stability calculation function first calculates the active power value P of the target generator based on the voltage value V and the current value I of the target generator. For example, in the example shown in FIG. 2, if the target generator is the generator G, the stability calculation function calculates the voltage value V _G and current value I _G of the generator G measured at the same sampling period, and Based on these phase angles, the current active power value PG of the generator _G is calculated. A value θ _G can be obtained.

The stability calculation function also calculates a steady state stability index indicating the steady state stability of the target power system using the output values of the components connected to the target power system. Specifically, the stability calculation function first uses the generated power value P of the target generator in the current configuration of the power system and the specified remote power station (for example, infinite bus) as the steady-state stability index. A power phase difference angle curve showing the relationship between the phase difference angle θ and the steady-state stability limit, which is the peak value of the power phase difference angle curve, are calculated.

For example, in the example shown in FIG. 2, if the target generator is the generator G, the stability calculation function indicates the relationship between the active power value PG of the generator _G and the phase difference angle θG of the generator _G. Calculate the power phase difference angle curve. Here, in the current configuration of the target power system shown in FIG. P _G and the phase difference angle θ _G theoretically have the relationship shown in the following formula (1). In the following formula (1), P _G + jQ _G is the complex power of the generator G, r ₁ + jx ₁ is the complex impedance of the transmission line L1, r ₂ + jx ₂ is the complex impedance of the transmission line L2, and V _G is the generator The voltage value of G, VP is the voltage value of the renewable energy power source _P , and θP is the phase difference angle of the renewable energy power source _P that can be obtained by the following equation (2). In addition, PP is the active power value of the renewable energy power supply _P in the following formula (2).

In the stability calculation function, the voltage value V _G of the generator G, the voltage value V _P of the renewable energy power source P, the voltage value V _IB of the infinite bus IB, the complex impedance r of the transmission line L1 are added to the above equation (1). ₁ +jx ₁ and the complex impedance r ₂ +jx ₂ of the transmission line L2, a power phase difference angle curve showing the relationship between the active power value P _G of the generator G and the phase difference angle θ _G can be calculated. Further, the stability calculation function calculates the phase difference angle at which the active power value PG peaks in the calculated power phase difference angle curve of the target generator _G as the steady-state stability limit.

Furthermore, in this embodiment, the stability calculation function also calculates the power phase difference angle curve and the steady-state stability limit when the current configuration of the target power system is changed. Here, FIG. 3 is a diagram showing an example in which the configuration of the target power system is changed. FIG. 3A shows the configuration of the target power system shown in FIG. 2 with the renewable energy power supply P removed, and FIG. 3B shows the current configuration of the target power system shown in FIG. It is the structure which added the renewable energy power supply P2. 3(C) is a configuration in which a renewable energy power supply P2 and a load B are added to the current configuration of the target power system shown in FIG. 2, and FIG. 3(D) is a configuration of the power system shown in FIG. This is a configuration in which the renewable energy power supply P is removed from the current configuration and a load B is added. In this embodiment, the stability calculation function is not only the power phase difference angle curve and steady state stability limit in the current configuration of the power system shown in FIG. 2, but also as shown in FIGS. Power phase difference angle curves and steady-state stability limits are also calculated for different current configurations of the target power system.

Note that the power phase difference angle curves in the configurations shown in FIGS. 3A to 3D can be calculated by a known method, and thus description thereof is omitted. In addition, when the configuration of the target power system is changed, the configuration of the power system after the change is not particularly limited. Alternatively, it may be determined automatically by the stability calculation function based on a certain rule. In addition, for the output values of components that cannot be measured in the target power system, the measured output values of other components and known transmission line impedances are used to correct the effects of power flows caused by renewable energy sources. You can also ask. Further, in the present embodiment, the stability calculation function uses GPS information (including output time information) transmitted from the measuring device to calculate the power phase difference angle curve based on the output values output at the same time. However, it is also possible to adopt a configuration in which the power phase difference angle curve is calculated by using measured values at different sampling times, such as a telemeter for a system control center, alone or in combination. For example, in a company's facility such as a renewable energy power source, it may not be possible to install a device that performs measurement in synchronization with a measuring device in another electrical station managed by a power system administrator. In such a case, without synchronizing the sampling times, calculations may be performed assuming that there are no large fluctuations in the amount of power generated by the renewable energy power source and the demand load, and the results may be displayed. In addition, since the loss due to the transmission line is small, it is also possible to adopt a configuration in which the active power value of non-measured power stations is replaced by the sum of the active powers of other power stations.

As shown in FIG. 4 , the display function of the arithmetic unit 12 displays the power phase difference angle curve in the current configuration of the target power system calculated by the stability calculation function, and the power when the configuration of the target power system is changed. The phase difference angle curves are superimposed and drawn on a graph, and displayed on the display of the display device 15 . In addition, the display function _draws a display (for example, a point _p in FIG. indicate. Note that FIG. 4 is a diagram showing an example of a graph in which the power phase difference angle curve in the current configuration of the target power system according to the present embodiment and the power phase difference angle curve when the configuration of the target power system is changed are superimposed. is.

For example, in the example shown in FIG. 4, FIG. 4C shows the power phase difference angle curves in the current configuration of the subject power system shown in FIG. In addition, FIG. 4A shows the power phase difference when the renewable energy power supply P is removed from the current configuration of the target power system (or when the power supply P is stopped) as shown in FIG. 4(B) shows the power phase difference angle curve when the renewable energy power supply P is removed from the current configuration of the target power system and the load B is added, as shown in FIG. 3(D). show. In addition, FIG. 4(D) shows a power phase difference angle curve when the renewable energy power source P2 is added to the current configuration of the target power system as shown in FIG. 3(B), and FIG. 4 shows a power phase difference angle curve when the output power of the renewable energy power source P is made higher than that of FIG. 4(D) in the current configuration of the target power system shown in FIG. The configuration shown in FIG. 3(C) is a combination of the configuration of FIG. 3(B) in which the renewable energy power sources P1 and P2 are connected and the configuration of FIG. 3(D) in which the load B is connected. and can be calculated depending on the respective parameters.

As shown in FIG. 4, the display function changes not only the power phase difference angle curve in the current configuration of the target power system (for example, the power phase difference angle curve in FIG. 4(C)), but also the configuration of part of the target power system. The power phase difference angle curves (for example, the power phase difference angle curves of FIGS. 4A, 4B, 4D, and 4E) are superimposed and drawn on the graph, and displayed on the display of the display device 15. do. Furthermore, as shown in FIG. 4, the display function displays the point p indicating the active power value PG and the phase difference angle _θG of the generator _G , which is the target generator, on the power phase difference angle curve of the current configuration of the target power system. (For example, the power phase difference angle curve in FIG. 4(C)).

Thus, in the present embodiment, the display function superimposes the power phase difference angle curve (C) in the current configuration of the target power system and the power phase difference angle curve when the configuration of the target power system is changed. Along with displaying, the generated power measured value P _G and measured value θ _G based on real-time measured values are plotted on the power phase difference angle curve (C) or near the power phase difference angle curve (C) due to the influence of measurement errors. This allows the administrator to visually grasp how the steady-state stability of the power system changes when the configuration of the target power system changes, using the current location as a reference. . For example, in the example shown in FIG. 4, the stability calculation function calculates the steady-state stability limit θ _C of the power phase difference angle curve (C) in the current configuration of the target power system to be 85.2°. Further, when the current active power value P _G of the generator G, which is the target generator, is 20 [pu] indicated by P ₀ in FIG. 4, the current phase difference angle θ _G of the generator G is θ ₁ is approximately 54°. Therefore, in the _{graph shown} in FIG. It can be grasped that _G does not exceed the steady-state stability limit θ _C , and it can be grasped that the steady-state stability in the current configuration of the target power system is high.

In this embodiment, the administrator uses the input device 17 to align the cursor displayed on the display of the display device 15 with the power phase difference angle curve (C) and the point p that are also displayed on the display. The display function displays the configuration of the target power system indicated by the power phase difference angle curve (C), the value of the steady state stability limit θc, the current power value PG of the generator _G indicated by the point p, and the value of the phase difference angle _θG . can be displayed. As a result, the administrator can determine the configuration of the power system indicated by the power phase difference angle curve (C), the value of the steady-state stability limit θc, the active power value PG and the phase difference angle _θG of the generator _G indicated by the point p. Values can be easily grasped. In addition, in the present embodiment, the display function allows the administrator to display the power phase difference angle curve by changing the line color and type (for example, wavy line, thick line, etc.) for each power phase difference angle curve displayed on the display device 15. can be easily distinguished.

In the example shown in FIG. 4, when the administrator uses the input device 17 to align the cursor displayed on the display with the power phase difference angle curve shown in FIG. It is possible to display the configuration of the target power system (which must be the configuration shown in FIG. 3A) and the numerical value of the steady-state stability limit θA that results in the power phase difference angle curve shown in ( _A ). As a result, when the administrator removes the renewable energy power supply P from the current configuration of the target power system shown in FIG. 2 and changes it to the configuration shown in FIG. It can be understood that the curve shown in (C) changes to the curve shown in FIG. 4(A). Also, in the power phase difference _{angle curve} shown in FIG. Since the angle θ ₀ is about 38°, the administrator can expect that the steady-state stability is higher than the current configuration of the target power system when the current configuration of the power system is changed to the configuration shown in FIG. becomes higher (increases stability).

Similarly, in the example shown in FIG. 4, when the administrator moves the cursor displayed on the display to the power phase difference angle curve shown in FIG. It is possible to display the configuration of the target power system that is the angular curve (the configuration shown in FIG. 3B) and the value of the steady-state stability limit _θC . As a result, when the administrator adds the renewable energy power source P2 to the current configuration of the target power system shown in FIG. 2 to change the configuration shown in FIG. It can be understood that the curve shown in (C) changes to the curve shown in FIG. 4(D). Moreover, in the power phase difference _{angle curve} shown in FIG. Since the phase difference angle θ ₂ with respect to is about 78°, when the current configuration of the power system is changed to the configuration shown in FIG. It can be seen that the stability is low and the steady-state stability is within the allowable range, but approaches the limit value asymptotically.

Furthermore, in the example shown in FIG. 4, when the administrator moves the cursor displayed on the display to the power phase difference angle curve shown in FIG. The configuration of the target power system to be the curve (the configuration in which the output value of the renewable energy power source P is increased in the configuration shown in FIG. 2) and the value of the steady-state stability limit θ _E are displayed on the display. As a result, the administrator can change the power phase difference angle curve from the curve shown in FIG. It can be grasped that it changes to the curve shown in E). Further, in the power phase difference angle curve shown in FIG. 4E, it is possible to obtain a phase difference angle equal to or less than the steady-state stability limit θ _E at the current active power value P ₀ (20 [p.u.]) of the generator G. Therefore, in the current configuration of the power system, if the output value of the renewable energy power source P is increased, the administrator will be concerned that the steady state stability will become unstable (beyond the steady state stability limit) and will exceed the allowable range. can grasp that.

Next, the notification function of the arithmetic device 12 will be described. The notification function determines the steady-state stability of the target power system, and notifies the administrator of a warning when the steady-state stability is equal to or less than a predetermined value. Specifically, the notification function first calculates the synchronizing force F of the target power system by measuring the power value P and the phase difference angle θ of the target generator in time series. More specifically, the notification function can obtain the synchronizing force F by the formula F=dP/dθ based on the time-series data of the power value P and the phase difference angle θ of the target generator. The synchronizing force F changes due to the influence of minute disturbances during operation of the target power system (for example, tap changes of interconnection transformers, turning on/off of transmission lines, system changes, system accidents involving remote locations, etc.). In this embodiment, the time-series data of the power value P and the phase difference angle θ of the target generator is accumulated in the database 14, and the reporting function refers to the database 14 to determine the power value P and the phase difference angle θ of the target generator. time series data can be obtained.

Then, the notification function determines the steady-state stability in the target power system by determining the conditions shown below. Specifically, the notification function determines that the steady-state stability of the target power system is low and issues a warning to the display device 15 or the notification device 16 when either of the following conditions (1) and (2) is satisfied. inform.

(1) Current phase difference angle θ of the target generator > steady-state stability margin M1 (steady-state stability margin M1 = steady-state stability limit in the current configuration of the target power system × margin coefficient C1)
(2) Synchronization force F of target power system < synchronization force margin M2 (synchronization force margin M2 = synchronization force F at steady state stability limit + margin coefficient C2)
In the above description, the synchronizing force F at the steady state stability limit is "0". In addition, the margin coefficient is a notification to the administrator when the phase difference angle θ of the target generator approaches the steady state stability limit of the target power even if it does not reach the steady state stability limit of the target power system. The margin coefficient C1 is set to a number greater than 0 and less than 1, such as 0.9, and the margin coefficient C2 is set to a number greater than 0, such as 0.2.

In addition, as shown in (3) and (4) below, the notification function predicts the output value of future generators, renewable energy power sources, electric stations, loads, etc., and based on the predicted output value, It can also be configured to determine the steady-state stability of the target power system.
(3) Phase difference angle θ after 1 hour of the target generator > Steady state stability margin M1 after 1 hour (Steady state stability margin M1 after 1 hour = Steady state in the configuration of the target power system after 1 hour Stability limit x Margin coefficient C1)
(4) Phase difference angle θ after n hours of the target generator > Steady state stability margin M1 after n hours (Steady state stability margin M1 after n hours = Steady state in the configuration of the target power system after n hours Stability limit x Margin coefficient C1)
In this case, the past performance data of each component of the target power system and the performance data of the output value of each component are stored in the database 14, and the notification function uses these performance data to It is possible to calculate the phase difference angle θ of the target generator after 1 hour or n hours and the steady-state stability limit of the target power system.

In addition, the notification function determines that the steady-state stability of the target power system is low when any one of the following (1') to (4') is satisfied instead of the above (1) to (4). Alternatively, the display device 15 or the notification device 16 may be configured to notify the alarm.
(1′) steady-state stability margin M1′ (steady-state stability margin M1′=steady-state stability limit in the current configuration of the target power system−current phase difference angle θ of the target generator)<predetermined value (2 ') Synchronization force margin M2' (Synchronization force margin M2' = Synchronization force F of target power system - Synchronization force F at steady state stability limit) < predetermined value (3') After 1 hour Steady-state stability margin M1′ (1-hour steady-state stability margin M1′=Steady-state stability limit in the configuration of the target power system after 1 hour−current phase difference angle θ of the target generator)<predetermined value (4') Steady-state stability margin M1' after n hours (Steady-state stability margin M1' after n hours = Steady-state stability limit in the configuration of the target power system after n hours - Current status of the target generator phase difference angle θ) < predetermined value

Furthermore, the notification function can be configured to determine the steady-state stability of the target power system as described below. That is, the notification function extracts the oscillation frequency f based on the time change of the phase difference angle θ of the target generator, and calculates the inertia constant of the target power system from the relationship between the oscillation frequency f and the synchronization force F. Then, the notification function may be configured to determine the steady-state stability of the target power system by comparing the calculated inertia constant of the target power system and the known inertia constant of each generator. Note that the period for obtaining the oscillation frequency f can be, for example, a period of 0.1 second to a period of 10 seconds.

Then, the notification function causes the display device 15 or the notification device 16 to issue an alarm when it is determined that the steady-state stability of the target power system is low. For example, when the notification function determines that the steady-state stability is low in the current configuration of the target power system, it issues a relatively strong warning because there is a high need to change the current configuration of the target power system. For example, the notification function can cause the display device 15 to display a warning message in an emphasized manner, and can cause the notification device 16 to output a warning sound. In addition, the notification function periodically determines the steady-state stability in the current configuration of the target power system, and when it is determined that the steady-state stability is low, it is configured to forcibly perform the above notification. can also

In addition, when it is determined that the steady-state stability will decrease when the configuration of the target power system is changed, the notification function can issue a relatively weak warning so as not to change the configuration of the target power system. can. For example, the notification function can be configured to display a predetermined warning message on the display device 15 . Further, in this case, the notification function is performed when the administrator operates the input device 17 and aligns the cursor displayed on the display with the power phase difference angle curve when the configuration of the target power system is changed. It can be configured to display a warning message.

In this way, the notification function judges the steady-state stability of the target power system with a certain margin, so that the administrator can make necessary changes before the steady-state stability of the target power system reaches the steady-state stability limit. It is possible to respond. In addition, by judging the steady-state stability for each configuration of the target power system, the notification function can tell the administrator how the steady-state stability will change when the configuration of the target power system is changed. You can figure out what to do.

Next, power management processing according to this embodiment will be described. FIG. 5 is a flowchart showing power management processing according to this embodiment. Note that the power management process according to the present embodiment is repeatedly executed at a predetermined cycle by the arithmetic device 12 of the power system management device 10 .

As shown in FIG. 5 , in step S101, the output value of each component of the target power system is acquired by the acquisition function of the arithmetic device 12 . Specifically, the acquisition function acquires the system constant of the target power system from the database 14, and acquires the output values such as the voltage value and current value of each component measured by the measuring device connected to the target power system. do.

In step S102, the stability calculation function of the arithmetic device 12 calculates the power value and the phase difference angle of the target generator based on the output value of the target generator obtained in step S101. Then, in step S103, by the stability calculation function, based on the system constant and the output value of each component acquired in step S101, and the power value and phase difference angle of the target generator calculated in step S102, the target power system Calculation of the power phase difference angle curve in the current configuration of is performed.

Further, in step S104, by the stability calculation function, based on the system constant and the output value of each component acquired in step S101, and the power value and phase difference angle of the target generator calculated in step S102, the target power system A power phase difference angle curve is calculated when the configuration of is changed. It should be noted that the configuration of the target power system after the change can be appropriately designated by the administrator via the input device 17, such as system change, equipment stoppage, and the like.

In step S105, the plurality of power phase difference angle curves calculated in steps S103 and S104 are superimposed and displayed on the display of the display device 15 by the display function. Further, in step S106, the point p indicating the power value and phase difference angle of the target generator calculated in step S102 is superimposed on the power phase difference angle curve drawn in step S105 and displayed on the display device 15 by the display function. be done.

In step S107, the current steady-state stability of the target power system is determined by the reporting function. For example, when the current phase difference angle of the target generator exceeds the steady-state stability margin M1 in the current configuration of the target power system, the notification function indicates that the steady-state stability in the current configuration of the target power system can be determined to be low. In addition, the notification function refers to the database 14, calculates the synchronizing force F based on the time-series data of the power value P and the phase difference angle θ of the target generator, and the synchronizing force F of the target power system is synchronized. It can also be determined that the steady-state stability in the current configuration of the target power system is low when it is lower than the force margin M2. Then, in step S108, when it is determined by the notification function that the steady-state stability in the current configuration of the target power system is low, the process proceeds to step S109, and an alarm is notified by the notification function. In this case, since it is necessary to change the current configuration of the target power system, the notification function causes the display device 15 to display the warning message in an emphasized manner, and also causes the notification device 16 to output a warning sound. If it is not determined in step S108 that the current configuration of the target power system has low steady-state stability, the process proceeds directly to step S110.

In step S110, determination of the steady-state stability when the configuration of the target power system is changed is performed by the notification function. In particular, in step S110, the notification function predicts the power generation and load conditions after 1 hour and n hours based on the past measurement data accumulated in the database 14, and takes into account the error rate of the prediction. , it is possible to determine the steady-state stability when the configuration of the target power system is changed due to equipment stoppage, system configuration change, or the like. Then, in step S111, if it is determined by the notification function that the steady-state stability will decrease when the configuration of the target power system is changed, the process proceeds to step S112, and an alarm is notified by the notification function. The notification function determines the steady-state stability in the configuration of the target power system indicated by the cursor when the administrator places the cursor on the power phase difference angle curve when the configuration of the target power system is changed. , when it is determined that the steady-state stability is low, a warning can be displayed in association with the power phase difference angle curve.

After performing the processing up to step S112, the processing returns to step S101, and the above processing is repeated. Thus, in this embodiment, based on the latest output value of each component, the steady state stability in the current configuration of the target power system and the steady state stability in the case where the configuration of the target power system is changed By judging the stability, it is possible for the administrator to grasp the steady-state stability in the current configuration and the steady-state stability in the case where the current configuration is changed in real time.

(Example 1)
Next, Example 1 of the power system management device 10 according to this embodiment will be described. Example 1 is an example in which the steady-state stability index in the current configuration is calculated in an existing electric power system. Specifically, in Example 1, the phase difference angle θ _G is calculated from the active power value P measured in the current configuration of the actual power system and the phase angle measured at the same sampling period, and the measured value is calculated. , the power phase difference angle curve in the current configuration and the power phase difference angle curve in the case of changing the constituent elements were calculated and displayed on the display device 15 . FIG. 6 is a diagram illustrating the configuration of a power system according to the first embodiment; Note that the power system of the first embodiment is an existing power system, and as shown in FIG. are connected via transmission lines L1-L3 and a transformer L4. The transmission line L3 is composed of transmission lines L3a and L3b, and the transformer L4 is also composed of transformers L4a and L4b.

In the power system shown in FIG. 6, output values such as power generation and demand (hereinafter also referred to as measured values) are measured for 24 hours, and based on the measured values, the generator in the configuration of the power system shown in FIG. The power phase difference angle curve C1 of G1 was calculated, and the active power value P _G1 and the phase difference angle θ _G1 of the generator G1 were calculated and plotted. 7 shows a part of the power phase difference angle curve C1 of the generator G1 in the configuration of the power system shown in FIG. 6, and the power phase difference angle of the generator G1 when the configuration of the power system shown in FIG. 6 is partially changed. It is a graph which shows a part of curve C2. In FIG. 7, R1 indicates a region in which the active power value P _G1 and the phase difference angle θ _G1 of the generator G1 changed during the actually measured 24 hours. Also, R2 indicates a simulated region of the active power value P _G1 and the phase difference angle θ _G1 when the output of the generator G1 is increased based on the actual measurement values over 24 hours. In the example shown in FIG. 7, since the active power value P of the target generator was calculated, the active power value P is displayed on a 1000 kVA basis in FIG. 7 (the same applies to FIG. 12 described later).

Here, the direction and magnitude of the current (power flow) depends on the configuration of the power system, the output of the generators G1 and G2, the magnitude of the demand of the loads B1 and B2, and the correlation between the power output of the renewable energy power sources P1 and P2. changes, and the phase difference angle θ changes. In Example 1, the power phase difference angle curve C2 of the generator G1 when the configuration of a part of the power system was changed was also calculated and displayed superimposed on the graph shown in FIG. Specifically, the power phase difference angle curve C2 when the transmission line L3b and the transformer L4b are stopped in the power system shown in FIG. , and superimposed on the graph shown in FIG. When the transmission line L3b and the transformer L4b are stopped in the power system shown in FIG. 6, the transformer L4 and the transmission line L3 change from a configuration of two units and two lines in parallel to a configuration of one unit and one line, The impedance in this section is approximately doubled, and the impedance from the generator G1 to the remote power station increases. In the electric power system shown in FIG. 6, when the output of the generator G1 is zero, the loads B1 and B2 form a power flow cross section in the receiving direction from the remote power station, so as shown in FIG. The phase difference angle θ at zero is in the lagging direction, and when the output of the generator G1 increases, the phase difference angle θ gradually changes in the leading direction. Further, when the demand of the loads B1 and B2 is larger than the power generation including the renewable energy power sources P1 and P2, when one transformer L4 and one transmission line L3 are stopped, the phase difference The angle θ changes in the direction lagging behind the phase difference angle in the current configuration. When one transformer L4 and one transmission line L3 are stopped, the phase difference angle θ changes in the leading direction more than the phase difference angle in the current configuration, and approaches the steady-state stability limit. In the first embodiment, the amount of power demanded by the loads B1 and B2 is greater than the amount of power generated by the renewable energy sources P1 and P2. As shown in FIG. 7, the power phase difference angle curve C1 was calculated in such a manner that it shifted to the power phase difference angle curve C2 in the lagging direction.

Thus, in the first embodiment, the power phase difference angle curve C1 in the current configuration of the power system is calculated using the actual measured values of the power system that actually exists, and in the region R1 on the power phase difference angle curve C1, this time It was possible to plot the active power value _PG1 and the phase difference angle _θG1 calculated from the measured values for 24 hours. In addition, the power phase difference angle curve C2 in a configuration in which one transformer L4 and one transmission line L3 are stopped was also able to be calculated and displayed in a superimposed manner. Thus, it was found that the power system management device 10 according to this embodiment is applicable to an existing electric system.

(Example 2)
In Example 2, the power phase difference angle curve is calculated when the configuration of the power system is changed from the current configuration, and then the configuration of the power system is actually changed, and the measured value in the configuration after the change is calculated. Based on this, the effective power value P and the phase difference angle θ were obtained, and it was verified whether the obtained effective power value P and the phase difference angle θ corresponded to the power phase difference angle curve in the configuration after the change. In an actual power system, it is difficult to intentionally change the state to a state where the steady-state stability is low. Measured by the same method as , and obtained the actual measurement results.

FIG. 8 is a diagram illustrating the configuration of a power system according to the second embodiment. 9 and 11 are graphs showing changes in the active power value PG and the phase difference angle _θG of the generator _G when the configuration of the power system shown in FIG. 8 is changed, and FIG. 2 is a graph showing changes in the active power value PG and the phase difference angle θG of the generator _G when the output of the generator _G is changed in the power system shown in FIG. In addition, in the examples shown in FIGS. 9 to 11, since a generator smaller than the target generator of the first embodiment shown in FIG. 7 is used, the active power value P is displayed on a 1 kVA basis in FIGS. is doing.

In the example shown in FIG. 9, the power phase difference angle curve of the generator G in the configuration of the power system shown in FIG. The retardation angle curve is shown as C4. In addition, in FIG. 9, the active power value PG and the phase difference angle of the generator _G obtained from the measured values before and after the transmission line L5b is stopped in the power system shown in FIG. θ _G is indicated by P1 to P4. Before the transmission line L5b is stopped in the power system shown in FIG. 8, the active power value PG and the phase difference angle _θG of the generator _G were the values indicated by P1 on the power phase difference angle curve C3. After that, when the power transmission line _L5b is _stopped in the power system shown in FIG. Compared to before stopping _L5b , only the potential power value PG has decreased. After that, the active power value PG and the phase difference angle _θG of the generator _G change along the power phase difference angle curve C4, while increasing the active power value PG, the phase difference angle _θG changes in the leading direction, and the phase difference angle _θG changes to P3. After passing through, it finally became _P4 , which is the same dominant power value PG as P1.

Also, the example shown in FIG. 10 shows changes in the active power value PG and the phase difference angle θG of the generator _G when the power generation amount of the generator _G is increased without changing the configuration of the electric power system. there is In the example shown in FIG. 10, only the power generation amount of the generator G is increased while the power transmission line L5b is stopped in the power system shown in FIG. The angle curve is indicated as C5, and the power phase difference angle curve of the generator G when the transmission line L5b is restarted is indicated as C6. In FIG. 10, the active power value PG and the phase difference angle θG of the generator _G before and after the power generation amount of the generator _G is increased are shown as P5 and P6. As shown in FIG. 10, the active power value P _G and the phase difference angle θ _G of the generator G were P5 on the power phase difference angle curve C5 before the power generation amount of the generator G was increased. After increasing the power generation amount of machine G, it changed to P6 on the same power phase difference angle curve C5. That is, when the power generation amount of the generator G is increased, it does not move to the power phase difference angle curve C6 when the configuration of the power system is changed, and power generation along the power phase difference angle curve C5 in the current configuration The active power value P _G of the aircraft G increased, and the phase difference angle θ _G changed in the leading direction.

Furthermore, in the example shown in FIG. 11, the power transmission line L5b is restarted in the power system shown in FIG. 3 shows the variation of active power value PG and phase difference angle _θG of generator _G based on values. In the example shown in FIG. 11, the power transmission line L5b is stopped in the power system shown in FIG. C8 is the power phase difference angle curve of the generator G when the Also, in FIG. 11, P7 to P10 show the active power value P _G and the phase difference angle θ _G of the generator G obtained from actual measurements before and after the transmission line L5b is restarted. In the power system shown in FIG. 8, when the transmission line L5b is stopped, the active power value PG and the phase difference angle _{θG of the generator G are} P7 on the power phase difference angle curve C7. After that, when the transmission line _L5b is restarted and the configuration of the power system is changed to that shown in FIG. 8, the active power value _PG and the phase difference angle θ It changed to P8 on the phase difference angle curve C8, and the dominant power value _PG increased while the phase difference angle _θG remained unchanged. Subsequently, the active power value _PG and the phase difference angle _θG of the generator _G gradually decrease along the power phase difference angle curve C8, and the phase difference angle _θG gradually lags. , P9, and finally changed to _P10 , which is the same dominant power value PG as P7.

As described above, in the second embodiment, when the configuration of the electric power system is actually changed, the active power value _PG and the phase difference angle _θG obtained from the actual measurement values are actually simulated based on the configuration after the change. It was confirmed that the value on the power phase difference angle curve was changed. Further, when the power generation amount of the generator G is changed without changing the configuration of the electric power system, the active power value PG and the phase difference angle _θG of the generator _G change on the power phase difference curve in the current configuration. I was able to confirm that. As a result, the phase difference angle curve in the current configuration of the power system, the active power value P and the phase difference angle θ in the current configuration of the power system, and the configuration of the power system can be obtained by the power system management device 10 according to the present embodiment. It was confirmed that it is possible to appropriately calculate the phase difference angle curve when changing.

(Example 3)
In the third embodiment, in the power system configuration shown in FIG. , the active power value P and the phase difference angle θ when the configuration of the power configuration is changed when the renewable energy power source exceeds the demand, were obtained based on the operation state of the actual system. FIG. 12 is a graph showing the active power value P and the phase difference angle θ of the generator when the power generation amount of the generator is increased in an existing electric power system. In FIG. 12, in an _actual electric power system that has the same configuration as that of FIG. The transition of θ _G1 is shown as C9, and the active power value _{PG and the phase difference angle θ G when} the power generation amount of the generator G1 is changed when one transmission line is stopped for inspection in the power system. is shown as C10. The transitions C9 and C10 shown in FIG. 12 are obtained by increasing the power generation amount of the generator _G1 by a predetermined amount, calculating and plotting the active power value PG and the phase difference angle _θG at each power generation amount.

As indicated by C9 in FIG. 12, in the configuration of the electric power system shown in FIG. 6, when the power generation amount of the generator _G1 is changed, the transition C9 of the active power value PG and the phase difference angle _θG based on the actual measurement values is , the active power value _PG1 gradually increased and the phase difference angle _θG gradually changed in the forward direction as the amount of power generation increased, showing changes similar to the power phase difference angle curve. Further, as shown in C10 in FIG. 12, in a configuration in which one transmission line is stopped, even when the power generation amount of the generator _G is increased, the active power value PG gradually decreases as the power amount increases. , the phase difference angle θ _G gradually changes in the advancing direction, showing a change similar to the power phase difference angle curve. In the electric power system illustrated in FIG. 12, the amount of demand is smaller than the amount of power generation. Therefore, when one transmission line is stopped, even if the active power value _PG is the same, the phase difference angle θ changes in the advancing direction, and as a result, the transition C10 of the active power value _PG and the phase difference angle _θG when one transmission line is stopped is the same as the transition C10 of the active power value _PG and the phase difference angle _θG during normal times. It was calculated in the advancing direction from C9.

In this way, according to Examples 1 to 3, the power system management device 10 according to the present embodiment has the power phase difference angle curve in the current power system configuration, and the power when the current power system configuration is changed. It was found that the retardation angle curve can be obtained as a curve that fits the measured values. Therefore, in the power system management device 10 according to the present embodiment, before changing the configuration of the power system, it is possible to visualize the steady-state stability in the configuration after the change and the future operation state with high accuracy. It was found that it is possible to have the administrator monitor and operate the system.

As described above, the power system management device 10 according to the present embodiment calculates the steady state stability index in the current configuration of the target power system and the steady state stability index when the configuration of the target power system is changed. By superimposing, it visualizes the steady-state stability in the current configuration of the target power system and the impact on the steady-state stability when the configuration of the target power system changes, such as the linkage of renewable energy power sources. can do. In particular, in the power system management device 10 according to the present embodiment, the power phase difference angle curve in the current configuration of the target power system and the power phase difference angle curve in the case where the configuration of the target power system has changed are displayed in a superimposed manner. , the administrator can more easily grasp the influence of the steady-state stability when the current configuration of the target power system changes. Further, in the power system management device 10 according to the present embodiment, by plotting and displaying the current active power value P and the phase difference angle θ of the target generator, the administrator can understand the steady-state stability of the target power system. It is also possible to monitor the margin. In addition, the multiple line segments that overlap indicate the current value and the assumed electromechanical state, and the method of diagramming is not limited to representation by line segments, such as planar color representation. .

As described above, the power system management device 10 according to the present embodiment determines the steady-state stability limit based on the actual measured value of the target power system, taking into consideration the power flow when the renewable energy power source and the load change. Real-time visualization makes it possible to contribute to the safe and secure operation of electric power networks. In addition, it will be possible to visualize the degree of inertial force reduction due to the increase in power sources that do not have inertial force, such as renewable energy power sources, and indicate it as an indicator of steady-state stability, contributing to power network operation. From the standpoint of steady-state stability, the phase difference between the equivalent infinite bus and the generator connection bus is affected when the output of a certain generator is changed, or when the tap of the interconnection transformer of the upper system is changed. By calculating ∂P/∂θ using measured values such as voltage change (a minute disturbance of about 1%), changes in steady-state stability can be visualized. Raising and lowering the tap of an interconnection transformer is easy to understand because it occurs frequently in daily operation. This analytical data can be used to support stable operation of the generator.
In addition, by charging the power generated by the renewable energy power source to a nearby storage battery, it is possible to apparently reduce the transmitted power and improve the steady-state stability, or to use a hydroelectric power plant such as a reservoir type or a dam type. In this system, by suppressing power generation and increasing the amount of water stored, transmission power is reduced and power is generated during times when there is a margin for steady-state stability. Similar to load response control, it supports stable operation and can contribute to a decarbonized society.

Although preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the description of the above embodiments. Various modifications and improvements can be added to the above-described embodiment examples, and forms with such modifications and improvements are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10... Power system control apparatus 11... Communication apparatus 12... Arithmetic apparatus 13... Storage device 14... Database 15... Display device 16... Notification device 17... Input device

Claims (9)

Acquisition means for acquiring an output value of each component connected to the power system;
Stability calculation means for calculating a steady state stability index indicating the steady state stability of the power system based on the output value of the component acquired by the acquisition means;
display means for displaying the steady-state stability index calculated by the stability calculation means;
The stability calculation means calculates the steady-state stability index in the current configuration of the power system and the steady-state stability index when the configuration of the power system is changed,
The display means draws and superimposes a display showing the steady state stability index in the current configuration of the power system and a display showing the steady state stability index when the configuration of the power system is changed. Display, power system management device. The stability calculation means calculates, as the steady-state stability index, a power phase difference angle curve indicating the relationship between the power value and the phase difference angle of a predetermined generator in the power system,
The display means draws a power phase difference angle curve in the current configuration of the power system and a power phase difference angle curve when the configuration of the power system is changed as the steady state stability index, and superimposes 2. The power system management device of claim 1, displaying. The stability calculation means further calculates, as the steady-state stability index, the current power value and the phase difference angle of the predetermined generator, and the steady-state stability limit, which is the peak value of the power phase difference angle curve. ,
The display means further displays, as the steady-state stability index, the current power value and the phase difference angle of the predetermined generator, and the steady-state stability limit in the current configuration of the electric power system. 3. The power system management apparatus according to claim 2, wherein , and a display showing the steady-state stability limit when the configuration of said power system is changed are drawn and displayed in a superimposed manner. The stability calculation means calculates a steady-state stability index when the output value of some components connected to the power system is changed,
The display means replaces the steady-state stability index when the configuration of the power system is changed, or in addition to the steady-state stability index when the configuration of the power system is changed, the power system The steady state stability index when the output value of some components connected to is changed is displayed superimposed on the steady state stability index in the current configuration of the power system. The power system management device according to any one of the above. Having a database in which system constants are stored in advance,
When the output value cannot be obtained from some of the components of the electric power system, the stability calculation means is based on the output value of the component whose output value can be obtained and the system constant stored in the database. 5. The power system management apparatus according to claim 1, further comprising: estimating an output value of a component for which said output value cannot be obtained, and calculating said steady-state stability index using said estimated output value. The acquisition means acquires the output value and output time information from each component of the power system,
6. The power system management apparatus according to claim 1, wherein said stability calculation means calculates said steady-state stability index based on said output values output at the same time. Determining the steady state stability in the current configuration of the power system and the steady state stability when the configuration of the power system is changed, the steady state stability in the current configuration of the power system, or the power system 7. The power system management apparatus according to any one of claims 1 to 6, further comprising notifying means for notifying when the steady-state stability is equal to or less than a predetermined value when the configuration of is changed. The electric power according to claim 7, wherein the reporting means determines the steady-state stability of the power system based on the steady-state stability margin, the synchronization force margin, or the inertia constant of the power system based on the oscillation frequency. System control device. Get the output value of each component connected to the power system,
calculating a steady state stability index indicating the steady state stability of the power system based on the obtained output values of the components;
A power system management method for displaying the calculated steady-state stability index,
Calculating the steady state stability index in the current configuration of the power system and the steady state stability index when the configuration of the power system is changed, and calculating the steady state stability index in the current configuration of the power system , and a steady-state stability index when the configuration of the power system is changed are superimposed and displayed.

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