JP2021132472A - Control system and control method of energy storage facility - Google Patents

Abstract

To maximize economical advantage of, for example, electric power supply to an external power system while securing an amount of power required in operating and stopping a main power generation facility.SOLUTION: A control system of energy storage facility includes: an atomic power generation facility 11; a photovoltaic power generation facility 12 and a wind turbine generator system 13 which generate electric power derived from renewable energy; a power storage facility 14 that stores the electric power generated by the photovoltaic power generation facility and the wind turbine generator system; and control means 16 that controls storage of the electric power in the power storage facility 14 in accordance with an operation status of the atomic power generation facility and weather so that the power storage facility 14 stores electric power of a requested power storage amount corresponding to a requested power amount requested by the atomic power generation facility, and further controls how much of the electric power stored in the power storage facility 14 is to be discharged to the atomic power generation facility 11 or an external power system in accordance with external factors including the status of the atomic power generation facility 11 and weather prediction.SELECTED DRAWING: Figure 2

Description

An embodiment of the present invention relates to a control system for energy storage equipment and a control method for energy storage equipment.

At domestic nuclear power plants, the new regulatory standards established after the 2011 off the Pacific coast of Tohoku Earthquake require multiplexing of emergency power sources, and in response to this, domestic operators are required to use emergency power sources for restarting nuclear power plants. Equipment is being added. These emergency power supplies are on standby in case of loss of external power, and these power supplies are not used during standby except for regular surveillance tests. Therefore, the addition of these power sources is a factor that deteriorates the economic efficiency of the plant.

Furthermore, domestic operators not only comply with the new regulatory standards, but also call it voluntary improvement of nuclear safety, and in addition to the safety measures under the new regulatory standards, for the risks that remain even after complying with the new regulatory standards. We are obliged to voluntarily pursue safety measures. These activities are also a factor in deteriorating the economic efficiency of the plant.

Therefore, in a nuclear power plant that is restarted or newly constructed, there is a demand for a power source that has both improved safety and economic efficiency. Here, since the power source corresponding to the new regulatory standard generally has a high installation cost and is not used for power generation in normal times, it is not expected to recover the cost by selling the power. On the other hand, in the case of a power source that contributes to voluntary safety improvement, since there are no restrictions on the new regulatory standards, it is possible to raise profits by keeping the installation cost low and selling power at normal times.

Note that Patent Document 1 proposes a technique for a wind power plant that can continue power generation of a nuclear power plant without any trouble even if the external power source of the nuclear power plant is lost. In this technology, the wind power generation device is normally used as commercial power, and when the external power source is lost, it is used in combination with a storage battery to generate emergency power in a nuclear power plant.

Japanese Unexamined Patent Publication No. 2004-44508

Apart from the emergency power supply required by the new regulatory standards established for nuclear power plants, it can be used as a facility that contributes to voluntary safety improvement when an external power source is lost, and can be sold or sold in the facility. It is expected that an auxiliary power source capable of supplying electric power to the nuclear power plant will be installed on the premises of the nuclear power plant to improve the safety and economic efficiency of the nuclear power plant.

In addition, as a measure against the new regulatory standards mentioned above, it is necessary to invest hundreds of billions of yen to restart the nuclear power plant, and some nuclear power plants will be decommissioned because it is judged that the investment cannot be recovered. It has increased. However, the decommissioning of nuclear power plants also requires a cost of several hundred billion yen, which is expected to put pressure on the management of businesses. Furthermore, since decommissioning requires a construction period of about 30 years, a power source required for cooling the fuel stored in the fuel pool inside the reactor building is required until the reactor building is dismantled. .. Therefore, effective utilization of the above auxiliary power source is required for the decommissioning plant.

The embodiment of the present invention has been made in consideration of the above-mentioned circumstances, and can secure the required amount of electric power when the main power generation facility is operated and stopped, and has economic merits such as supplying electric power to an external power system. It is an object of the present invention to provide a control system and a control method of energy storage equipment capable of maximizing the above.

The control system for the energy storage equipment according to the embodiment of the present invention uses the main power generation equipment, the renewable energy power generation equipment that generates energy from the renewable energy that is natural energy, and the power generated by the renewable energy power generation equipment. According to the operating conditions and the weather of the main power generation equipment, the energy storage equipment is stored so that the energy storage equipment stores the required energy amount corresponding to the required power amount required by the main power generation equipment. How much energy is stored in the energy storage facility to the main power generation facility or the external power system according to external factors including the state of the main power generation facility and weather prediction, while controlling the energy storage in the facility. It is characterized in that it is configured to have a control means for controlling whether or not to release the energy.

The control method of the energy storage equipment according to the embodiment of the present invention is to use the main power generation equipment, the renewable energy power generation equipment that generates energy from the renewable energy that is natural energy, and the power generated by the renewable energy power generation equipment. The operating status of the main power generation equipment is such that the energy storage equipment is installed and prepared, and the energy storage equipment accumulates the required energy amount corresponding to the required power amount required by the main power generation equipment. And the energy storage in the energy storage facility is controlled according to the weather, and the energy stored in the energy storage facility is used for the main power generation according to the state of the main power generation facility and external factors including the weather prediction. It is characterized by controlling how much energy is released to equipment or an external power system.

According to the embodiment of the present invention, it is possible to secure the required amount of electric power when the main power generation facility is operated and stopped, and to maximize the economic merit of supplying electric power to the external power system.

The schematic vertical sectional view which shows the structure of the power plant to which the control system of the energy storage equipment which concerns on 1st Embodiment is applied. The schematic plan view which shows the power plant of FIG. 1 together with the control means of a control system. A graph showing the relationship between the amount of power generated by a photovoltaic power generation facility and the amount of electricity stored in a power storage facility when the weather is sunny, (A) showing the case without weather prediction, and (B) showing the case with weather prediction. .. The graph which compares and shows the required electric energy required at the time of loss of an external power source, etc., when the nuclear power generation facilities of FIGS. 1 and 2 are in operation and stopped. FIG. 5 is a flowchart showing a control procedure for a power storage facility or the like executed by the control means of FIG. FIG. 5 is a flowchart showing a procedure for determining a required power storage amount of the power storage equipment corresponding to the required power amount during operation and shutdown of the nuclear power generation equipment of FIGS. 1 and 2. The flowchart which shows the procedure that the control means in the control system of the energy storage equipment which concerns on 2nd Embodiment selects the power source which receives electric power in an emergency such as loss of an external power source. The flowchart which shows the procedure which the control means in the control system of the energy storage equipment which concerns on 3rd Embodiment selects the power source which receives electric power when the nuclear power generation equipment is stopped.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[A] First Embodiment (FIGS. 1 to 6)
FIG. 1 is a schematic vertical sectional view showing a configuration of a power plant to which a control system for energy storage equipment according to the first embodiment is applied. The power plant 10 shown in FIGS. 1 and 2 is a main power generation facility (nuclear power generation facility 11 in this embodiment) that serves as a main power source, and renewable energy that generates power from renewable energy that is a natural energy source and serves as a sub-power source. Power generation equipment (solar power generation equipment 12 and wind power generation equipment 13 in this embodiment), energy storage equipment that stores the power generated by the renewable energy power generation equipment as energy (storage equipment 14 in this embodiment), and a monitor. It is configured to include a device 15 and a control means 16. Of these, the monitor device 15 and the control means 16 constitute a control system 17 of the power storage equipment 14 as the energy storage equipment.

Here, the main power generation facility may be a thermal power generation facility or the like in addition to the nuclear power generation facility 11 having the reactor building 18 and the turbine building 19. Further, the renewable energy power generation facility may include a tidal power generation facility, a hydroelectric power generation facility, and the like, in addition to the solar power generation facility 12 and the wind power generation facility 13 installed in the vicinity of the nuclear power generation facility 11. In addition, the energy storage facility aims to equalize the amount of power generated by the renewable energy power generation facility by accumulating (storing) the power generated by the renewable energy power generation facility (solar power generation facility 12, wind power generation facility 13). It is a thing. In addition to the power storage equipment 14, the energy storage equipment may be an energy storage equipment such as storing electric power with hydrogen.

The power generated by the solar power generation facility 12 and the wind power generation facility 13 and the power stored in the power storage facility 14 are supplied to the nuclear power generation facility 11 in an emergency such as when the external power source of the nuclear power generation facility 11 is lost, and the nuclear power generation is performed. In addition to being supplied to the nuclear power generation facility 11 during normal operation or shutdown of the facility 11, it is also supplied to the external power system and sold. When the power generation plant 10 is used as an evacuation center in the event of a disaster, the solar power generation facility 12, the wind power generation facility 13, and the power storage facility 14 may be used as a power source for the evacuation center.

The monitoring device 15 monitors the states of the nuclear power generation facility 11, the solar power generation facility 12, the wind power generation facility 13, and the power storage facility 14. That is, the monitor device 15 monitors the operation and stoppage of the nuclear power generation facility 11, and further monitors the occurrence of an emergency event such as the loss of an external power source. Further, the monitoring device 15 monitors the operation and stop of each of the photovoltaic power generation facility 12 and the wind power generation facility 13, and also monitors the amount of power generated by each of the photovoltaic power generation facility 12 and the wind power generation facility 13. Further, the monitor device 15 monitors the amount of electricity stored in the electricity storage facility 14.

As a first function, the control means 16 of the nuclear power generation facility 11 so that the power storage facility 14 stores the required power storage amount corresponding to the required power amount required by the nuclear power generation facility 11 in an emergency such as when an external power source is lost. The storage (storage) of electric power in the power storage facility 14 is controlled according to the operating conditions and the weather. The amount of electricity stored in the electricity storage facility 14 is indicated by a curve C in FIG. 3, the maximum amount of electricity stored is indicated by a straight line D, and the required power required in an emergency such as when the external power source is lost in the nuclear power generation facility 11. The required electricity storage amount corresponding to the amount is displayed by the curve E. The power storage equipment 14 needs to secure this required power storage amount E.

As shown in FIG. 4, the required electric energy of the nuclear power generation facility 11 differs between when the nuclear power generation facility 11 is in operation and when it is stopped. That is, the amount of load used by the nuclear power generation facility 11 differs between the operating state and the stopped state in an emergency such as when an external power source is lost. The highest priority load in an emergency during operation of the nuclear power generation facility 11 is the equipment used for cooling the core during an emergency stop, but the highest priority load in an emergency during an emergency is the fuel in the fuel pool. It is a device used for cooling. For this reason, since the load amount is generally reduced when the nuclear power plant 11 is stopped, the required electric energy of the nuclear power generation facility 11 is lower when the nuclear power plant 11 is stopped than when the nuclear power plant 11 is operated. Therefore, the required electricity storage amount E of the electricity storage facility 14 corresponding to the required electric energy of the nuclear power generation facility 11 is set lower when the nuclear power generation facility 11 is stopped than when it is in operation.

The electric power stored in the power storage facility 14 is the power generated by the solar power generation facility 12 and the wind power generation facility 13, and the solar power generation facility 12 and the wind power generation facility 13 have weather (sunny, cloudy, rainy). , Atmospheric pressure difference, etc.) The amount of power generation changes. From these facts, the control means 16 controls the amount of electricity stored in the electricity storage facility 14 according to the operating status (operation, stoppage) and the weather of the nuclear power generation facility 11, and causes the electricity storage facility 14 to secure the required amount of electricity E. ..

Further, as a second function, the control means 16 transfers the electric power stored in the power storage facility 14 to the nuclear power generation facility 11 or the external power system according to external factors including the state of the nuclear power generation facility 11 and the weather prediction. Control whether to release (supply). Here, the state of the nuclear power generation facility 11 is an emergency event such as operation, stoppage, or loss of an external power source of the nuclear power generation facility 11. External factors include forecasts of weather (sunny, cloudy, rainy, atmospheric pressure difference, etc.) in which the amount of power generated by the photovoltaic power generation facility 12 and the wind power generation facility 13 fluctuates, as well as power demand that changes depending on the time of day. This is the power trading situation where the electricity price changes depending on the forecast of the day.

Specifically, the control means 16 predicts the amount of power generated by the photovoltaic power generation facility 12 and the wind power generation facility 13 according to the weather prediction. When this power generation amount is sufficient, the control means 16 transfers the power storage amount from the power storage facility 14 to the nuclear power generation facility 11 or the external power system, and the power storage amount of the power storage facility 14 corresponds to the required power amount of the nuclear power generation facility 11. The stored power is released (supplied) until it falls below E. When the power storage amount from the power storage equipment 14 is supplied to the external power system to sell the power, the control means 16 determines the release timing of the power storage amount from the power storage equipment 14 based on the power demand forecast, and the power demand is large and the power is insufficient. Determine the time zone when the electricity rate is high based on the electricity transaction status. It is preferable that the discharge of the stored power from the power storage equipment 14 and the determination of the release timing are carried out by the artificial intelligence (AI) provided in the control means 16.

FIG. 3 is a graph showing the relationship between the amount of power generated by the photovoltaic power generation facility 12 and the amount of electricity stored in the power storage facility 14, respectively, when (A) has no weather prediction and (B) has weather prediction. .. In FIG. 3, the amount of power generated by the photovoltaic power generation facility 12 is displayed by a curve A, the amount of power used (power demand) is displayed by a curve B, and the amount of electricity stored by the power storage facility 14 is displayed by a curve C. .. The required storage amount E of the power storage facility 14 is set lower than the maximum storage amount D, and changes depending on the operation and stop of the nuclear power generation facility 11 as described above. When the control means 16 does not perform weather prediction, as shown in FIG. 3A, an area (hatched area) surrounded by the required electricity storage amount E, the electricity storage amount C, and the generated power amount A of the electricity storage facility 14. Is the range in which power can be sold that can be supplied to the external power system.

By expanding the above-mentioned range in which electricity can be sold, it is possible to increase economic merits by increasing profits from selling electricity. For example, in the case of the photovoltaic power generation equipment 12, when sufficient storage of electricity in the storage equipment 14 can be expected after sunrise, as shown in FIG. 3B, the stored power stored in the storage equipment 14 before sunrise is stored. It is possible to sell electricity by discharging the amount C to a extent that it is less than the required storage amount E. That is, the control means 16 predicts the power generation amount (power generation amount A) of the photovoltaic power generation facility 12 based on the weather prediction, whereby the power storage amount C of the power storage facility 14 with respect to the required power storage amount E before sunrise. The stored power is released so that it is temporarily lowered. Even in this case, the power storage facility 14 is charged with power generated after sunrise by the photovoltaic power generation facility 12, and the power storage facility 14 secures the required electric energy E required in an emergency such as when the external power source of the nuclear power generation facility 11 is lost. , It becomes possible to supplement with the solar power generation equipment 12.

Therefore, it is possible to increase the amount of power sold to the external power system by discharging the stored power to the power storage facility 14 at night to the extent that the stored amount C is less than the required stored amount E. The range in which power can be sold that can be supplied to the external power system at this time is shown in the hatched area of FIG. 3 (B).

In addition, with the expansion of the introduction of photovoltaic power generation, the power supply becomes excessive in the daytime, but a phenomenon called "duck curve" occurs in which the power is insufficient during the time when the power demand is high after the evening. At present, the daytime electricity rate is the highest, but under the "duck curve" phenomenon, a reversal occurs, the daytime electricity rate becomes the cheapest, and the electricity rate after the evening becomes high. Therefore, as for the operation of the power storage equipment 14, it is economically advantageous to store power in the daytime and release (sell power) after the evening. The control means 16 discharges the stored power stored in the power storage facility 14 during a time period (for example, at night) when the power demand is high and the electricity rate is high, in accordance with the power demand forecast and the power transaction status in consideration of the above circumstances. do.

Further, as a function belonging to the first function, the control means 16 first, as shown in FIG. 4, is an emergency (for example, an external power source) of the nuclear power generation facility 11 that changes depending on the operating status (operation, stop) of the nuclear power generation facility 11. The required amount of power required at the time of loss, etc.) is obtained in advance for each operating condition. Next, the control means 16 sets the required electricity storage amount E corresponding to the required electric energy E according to the operating condition of the nuclear power generation equipment 11 in the electricity storage equipment 14 for each operating condition of the nuclear power generation equipment 11 and stores the electricity.

For example, the required storage amount E of the power storage facility 14 is smaller when the nuclear power generation facility 11 is stopped than when it is in operation. Therefore, in the control means 16, after the nuclear power generation facility 11 is switched from the operation to the stop and the fuel is transported from the core to the fuel pool, the required storage amount E of the power storage facility 14 is set to the required storage amount E during the operation of the nuclear power generation facility 11. The nuclear power generation facility 11 is changed to the required storage amount E when the nuclear power generation facility 11 is stopped, which is lower than the amount E. As a result, while the nuclear power generation facility 11 is stopped, it is possible to supply the amount of electricity stored as the required amount of electricity stored to the external power system and sell it.

The functions of the control means 16 configured as described above will be further described with reference to the flowcharts of FIGS. 5 and 6.
As shown in FIG. 5, the control means 16 predicts the amount of power generated by the photovoltaic power generation facility 12 and the wind power generation facility 13 at night based on the weather prediction after sunrise (S1). Next, the control means 16 determines whether or not the weather after sunrise is good (for example, sunny) (S2), and if it is not sunny, the amount of electricity stored in the power storage facility 14 after sunrise cannot be expected to increase. , The use (release) of the stored amount stored in the power storage facility 14 at night is suppressed (S3).

When the weather after sunrise is sunny in step S2, it is expected that the power storage equipment 14 will be charged after sunrise, so that the control means 16 uses (releases) the stored power stored in the power storage equipment 14 at night (release). S4). As a result of step S4, in the power storage equipment 14, the power storage amount before sunrise temporarily sets the required power storage amount E corresponding to the required power amount to be prepared in an emergency such as when the external power source of the nuclear power generation equipment 11 is lost. The amount of electricity stored is less than (S5).

Next, the control means 16 determines whether or not an emergency event such as a loss of an external power source has occurred in the nuclear power generation facility 11 before sunrise (S6). When it is determined in step S6 that no emergency event has occurred, the control means 16 stores the electric power generated by the solar power generation equipment 12 and the wind power generation equipment 13 in the power storage equipment 14 after sunrise (S7). .. By this step S7, the amount of electricity stored in the electricity storage equipment 14 is recovered to the extent that it exceeds the required amount of electricity stored E.

In step S6, when the control means 16 determines that an emergency event has occurred in the nuclear power generation equipment 11, the amount of electricity stored in the power storage equipment 14 is supplied to the nuclear power generation equipment 11 as an emergency power source before sunrise (S8). ). Subsequently, the control means 16 supplies the power generated by the photovoltaic power generation facility 12 and the wind power generation facility 13 generated at sunrise to the nuclear power generation facility 11 as an emergency power source before the storage amount in the power storage facility 14 is exhausted (S9). ..

Before or during the execution of the control procedure shown in FIG. 5, the control means 16 first, as shown in FIG. 6, first, the required power storage amount E and the power sales amount of the power storage facility 14 based on the operation time of the nuclear power generation facility 11. Is set (S11). Next, the control means 16 determines whether or not the nuclear power generation facility 11 is currently in operation (S12). When the nuclear power generation facility 11 is in operation, the control means 16 corresponds to the required power storage amount E of the power storage facility 14 corresponding to the required power amount required by the operating nuclear power generation facility 11 in an emergency such as when the external power source is lost. It is determined that the required electricity storage amount E is secured (S13).

When the control means 16 determines in step S12 that the nuclear power generation facility 11 is not currently in operation but is stopped, the control means 16 sets the required power storage amount E and the power sale amount of the power storage facility 14 and stops the nuclear power generation facility 11. Change to the one based on the inside (S14). As a result, the control means 16 secures the required power storage amount E of the power storage equipment 14 at the required power storage amount E corresponding to the required power amount E required by the stopped nuclear power generation equipment 11 in an emergency such as when the external power source is lost. (S15).

The required storage amount E of the power storage equipment 14 secured in steps S13 and S15 is set to be larger when the nuclear power generation equipment 11 is in operation than when it is stopped (S16). Therefore, the amount of electricity generated by supplying the power generated by the solar power generation facility 12 and the wind power generation facility 13 and the stored power of the power storage facility 14 to the external power system is higher when the nuclear power generation facility 11 is stopped than when it is in operation. It becomes larger (S17).

Since it is configured as described above, according to the first embodiment, the following effects (1) to (3) are obtained.
(1) As shown in FIG. 2, the control means 16 causes the power storage equipment 14 to store the required power storage amount E corresponding to the required power amount required by the nuclear power generation equipment 11 in an emergency such as when the external power source is lost. It is assumed. Therefore, the nuclear power generation facility 11 can secure the electric power required for operation and stoppage including an emergency such as when the external power source is lost from the power storage facility 14, and further supplements from the solar power generation facility 12 and the wind power generation facility 13. be able to. As a result, the safety of the nuclear power generation facility 11 can be improved.

(2) As shown in FIGS. 2 and 3, the control means 16 responds to the state of the nuclear power generation facility 11 (operation, stoppage, occurrence of an emergency event) and external factors (weather forecast, power demand forecast, power transaction status). Therefore, it controls how much the stored power stored in the power storage facility 14 is discharged to the nuclear power generation facility 11 or the external power system. Therefore, for example, when the weather forecast after sunrise is sunny, the generated power of the photovoltaic power generation facility 12 after sunrise can be sufficiently expected, and this sufficient generated power can be stored in the power storage facility 14. Therefore, the stored power is temporarily released before sunrise until the stored power of the power storage facility 14 becomes less than the required power storage amount E corresponding to the required power amount of the nuclear power generation facility 11 and supplied to the external power system. (Power sale) is possible. As a result, it is possible to maximize the economic merit while maintaining the improvement of safety.

(3) As shown in FIGS. 4 and 5, the control means 16 receives the required power storage of the power storage facility 14 corresponding to the required power amount of the nuclear power generation facility 11 that changes depending on the operating status (operation, stop) of the nuclear power generation facility 11. The amount E is changed according to the operating condition of the nuclear power generation facility 11. The required storage amount E of the power storage equipment 14 is set lower when the nuclear power generation equipment 11 is stopped than when it is in operation. Therefore, the control means 16 can supply more electricity stored in the electricity storage facility 14 to the external power system than during operation when the nuclear power generation facility 11 is stopped, and can increase the economic merit. ..

[B] Second embodiment (FIG. 7)
FIG. 7 is a flowchart showing a procedure in which the control means in the control system of the energy storage equipment according to the second embodiment selects a power source to receive electric power in an emergency such as when an external power source is lost. In this second embodiment, the same parts as those in the first embodiment are designated by the same reference numerals as those in the first embodiment to simplify or omit the description.

The difference between the control system 20 (see FIG. 2) of the power storage equipment 14 as the energy storage equipment in the second embodiment is that the nuclear power generation equipment 11 becomes the power storage equipment 14 in an emergency such as when an external power source is lost. When using the stored stored power, the control means 21 (see FIG. 2) is configured to discharge and use the stored power based on the priority of the load of the use destination. In addition to the above-mentioned functions, the control means 21 also has the same functions as the control means 16 of the first embodiment.

In addition to cooling the core, the power storage equipment 14 is used in an emergency such as when the external power source of the nuclear power generation equipment 11 is lost, such as lighting an area used in an emergency and supplying power to infrastructure such as air conditioning. Of these, the highest priority is core cooling. Even if the above-mentioned emergency period is longer than expected, the power storage facility 14 does not run out of stored power by receiving power from the solar power generation facility 12 and the wind power generation facility 13.

Even in that case, by cutting off the power supply to the load other than the core cooling, it is possible to surely reduce the risk of the power storage equipment 14 running out of electric power. From this point of view, the control means 21 sets a priority for the load used in an emergency such as when the external power source of the nuclear power generation facility 14 is lost, and stores electricity in the power storage facility 14 based on the priority of the load at the destination. By sequentially supplying electric power to the load to be used, the risk of exhaustion of the stored electric power of the power storage equipment 14 is reduced.

Next, the emergency control procedure of the control means 21 in the second embodiment will be described with reference to FIG. 7.
First, the control means 21 determines that the nuclear power generation facility 11 is in an emergency such as when the external power source is lost (S20). At this time, the control means 21 determines whether or not the emergency power source of the nuclear power generation facility 11 can be used (S21), and if it can be used, causes the nuclear power generation facility 11 to receive power from the emergency power source (S22). ).

When the emergency power source cannot be used in step S21, the control means 21 causes the nuclear power generation facility 11 to start receiving power from the solar power generation facility 12 and the wind power generation facility 13 (S23). After this step S23, the control means 21 constantly determines whether or not the photovoltaic power generation facility 12 and the wind power generation facility 13 can generate power at the present time (S24), and if so, the nuclear power generation facility. 11 is continued to receive power from the solar power generation facility 12 and the wind power generation facility 13 (S25).

When the photovoltaic power generation equipment 12 and the wind power generation equipment 13 become unable to generate power in step S24, the control means 21 causes the nuclear power generation equipment 11 to start receiving power from the power storage equipment 14 (S26). At this time, the control means 21 determines whether or not the amount of electricity stored in the electricity storage facility 14 is equal to or greater than a certain amount of electricity required to supply power to the nuclear power generation facility 11 (for example, the required amount of electricity stored E) (S27). ).

If the amount of electricity stored in the electricity storage equipment 14 is equal to or greater than a certain amount of electricity in step S27, the control means 21 causes the nuclear power generation equipment 11 to continue receiving power from the electricity storage equipment 14 (S28). When the amount of electricity stored in the electricity storage facility 14 is less than a certain amount in step S27, the control means 21 sets a priority for the load used in an emergency such as when the external power source of the nuclear power generation facility 11 is lost. The stored power from the power storage equipment 14 is sequentially received from the destination load having a high priority (S29).

Since it is configured as described above, according to the second embodiment, in addition to the same effects as the effects (1) to (3) of the first embodiment, the following effects (4) are obtained.

(4) The control means 21 sets a priority for a load used in an emergency such as when the external power source of the nuclear power generation facility 14 is lost, and stores electricity in the power storage facility 14 based on the priority of the load at the destination. Electric power is sequentially supplied to the destination load. As a result, the amount of electricity stored in the electricity storage facility 14 avoids the risk of exhaustion of power supply to the load used for core cooling, for example, the load used for cooling the core, which is the highest priority load in an emergency such as when the external power source of the nuclear power generation facility 11 is lost. Long-term power supply to the priority load can be reliably realized.

[C] Third Embodiment (FIG. 8)
FIG. 8 is a flowchart showing a procedure in which the control means in the control system of the energy storage equipment according to the third embodiment selects a power source that receives electric power when the nuclear power generation equipment is stopped. In this third embodiment, the same parts as those in the first embodiment are designated by the same reference numerals as those in the first embodiment to simplify or omit the description.

The difference between the control system 30 (see FIG. 2) of the power storage equipment 14 as the energy storage equipment in the third embodiment is that the nuclear power generation equipment 11 is required when the nuclear power generation equipment 11 is stopped. When the purchase cost when purchasing power from an external power system and receiving power is high, the control means 31 (see FIG. 2) predicts the amount of power generated by the solar power generation equipment 12 and the wind power generation equipment 13 according to the weather forecast. Then, based on the prediction result of the amount of power generation, the storage power is controlled to be discharged from the power storage equipment 14, and the discharged power storage power is received by the nuclear power generation equipment 11. In addition to the above functions, the control means 31 also has the same function as the control means 16 of the first embodiment.

During normal operation, the nuclear power generation facility 11 supplies the external power system with the amount of power obtained by subtracting the amount of power consumed in the facility and sells the power. On the other hand, when the periodic inspection or the like is stopped, the nuclear power generation facility 11 needs to receive the amount of electric power consumed in the facility, though not as much as during operation. When the nuclear power generation facility 11 is stopped, the control means 31 causes the nuclear power generation facility 11 to receive power from the solar power generation facility 12 and the wind power generation facility 13. When it becomes impossible to receive power from the photovoltaic power generation equipment 12 and the wind power piezoelectric equipment 13, the control means 31 causes the nuclear power generation equipment 11 to be charged from the external power system or the power storage equipment 14. The power reception from the power storage equipment 14 is carried out when the electricity charge of the external power system is high.

When receiving power from the power storage facility 14 of the nuclear power generation facility 11, the control means 31 predicts the weather and predicts the amount of power generated by the photovoltaic power generation facility 12 and the wind power generation facility 13. This is, for example, when the amount of power generated by the photovoltaic power generation facility 12 after sunrise is predicted and the amount of power generated after this sunrise can be sufficiently expected, the nuclear power generation facility 11 requests the amount of electricity stored from the power storage facility 14 before sunrise. This is so that the amount of electricity stored can be less than the above.

The control procedure of the control means 31 described above will be described with reference to FIG.
First, the control means 31 determines that the nuclear power generation facility 11 is stopped (S30). When the nuclear power generation facility 11 is stopped, the control means 31 causes the nuclear power generation facility 11 to start receiving power from the solar power generation facility 12 and the wind power generation facility 13 (S31).

Next, the control means 31 constantly determines whether or not the photovoltaic power generation facility 12 and the wind power generation facility 13 can generate power at the present time (S32). When the photovoltaic power generation facility 12 and the wind power generation facility 13 can generate power, the control means 31 causes the nuclear power generation facility 11 to continue receiving power from the photovoltaic power generation facility 12 and the wind power generation facility 13 (S33).

When the solar power generation facility 12 and the wind power generation facility 13 become unable to generate power in step S32, the control means 31 determines whether or not the electricity charge purchased from the external power system is in a high time zone. (S34). When the electricity charge is not high in the time zone in step S34, the control means 31 causes the nuclear power generation facility 11 to receive power from the external power system (S35).

When the electricity charge is high in the time zone in step S34, the control means 31 causes the nuclear power generation facility 11 to receive power from the power storage facility 14 (S36). When receiving power from the power storage facility 14 of the nuclear power generation facility 11, the control means 31 predicts the amount of power generated by the solar power generation facility 12 and the wind power generation facility 13 based on the weather prediction, for example, after sunrise of the solar power generation facility 12. When the amount of power generation is expected to be sufficient, the power storage facility 14 releases stored power that is less than the required storage amount E before sunrise, and causes the nuclear power generation facility 11 to receive power.

Since it is configured as described above, according to the third embodiment, in addition to the same effects as the effects (1) to (3) of the first embodiment, the following effect (5) is obtained.

(5) If the electricity charge purchased by the nuclear power generation facility 11 from the external power system is high while the nuclear power generation facility 11 is stopped, the control means 31 causes the storage power of the power storage facility 14 to be supplied to the nuclear power generation facility 11. To receive power from the nuclear power generation facility 11. As a result, the economic burden on the nuclear power generation facility 11 can be reduced, and the economic merit can be maximized.

Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention, and their replacements and changes can be made. Is included in the scope and gist of the invention, and is also included in the invention described in the claims and the equivalent scope thereof.

For example, when the nuclear power generation facility is abolished (decommissioned), the decommissioning work time is long. Therefore, in order to cool the fuel pool of the nuclear power generation facility to be decommissioned for a long period of time, the present embodiment The operation when the nuclear power generation facility is stopped may be applied to a power plant including a nuclear power generation facility, a solar power generation facility, a wind power generation facility, and a power storage facility to be decommissioned.

11 ... Nuclear power generation equipment (main power generation equipment), 12 ... Solar power generation equipment (renewable energy power generation equipment), 13 ... Wind power generation equipment (renewable energy power generation equipment), 14 ... Power storage equipment (energy storage equipment), 16 ... Control means , 17 ... Control system, 20 ... Control system, 21 ... Control means, 30 ... Control system, 31 ... Control means, E ... Required storage amount (required energy amount)

Claims (6)

Main power generation equipment and
Renewable energy power generation equipment that generates electricity from renewable energy, which is natural energy,
An energy storage facility that stores the electric power generated by the renewable energy power generation facility as energy, and an energy storage facility.
The storage of energy in the energy storage facility is controlled according to the operating conditions and the weather of the main power generation facility so that the energy storage facility accumulates the required energy amount corresponding to the required power amount required by the main power generation facility. Further, a control means for controlling how much energy stored in the energy storage facility is released to the main power generation facility or the external power system according to external factors including the state of the main power generation facility and weather prediction. A control system for energy storage equipment, characterized in that it is configured with and. The external factors are weather forecasts, electricity demand forecasts, and electricity transaction status.
The control means predicts the amount of power generated by the renewable energy power generation facility according to the weather prediction, and releases energy from the energy storage facility to a level lower than the required energy amount corresponding to the required power amount of the main power generation facility. The control system for energy storage equipment according to claim 1, wherein the release time is determined according to the power demand forecast and the power transaction status. The control means is characterized in that when the main power generation facility uses the energy stored in the energy storage facility when the external power source is lost, the energy is released and used based on the priority with respect to the load of the user. The control system for energy storage equipment according to claim 1 or 2. The control means obtains the required power amount of the main power generation facility, which changes depending on the operating state of the main power generation facility, for each operating state, and the required energy corresponding to the required power amount according to the operating state of the main power generation facility. The control system for an energy storage facility according to any one of claims 1 to 3, wherein the amount is controlled so as to be stored in the energy storage facility. The control means predicts the amount of power generated by the renewable energy power generation facility according to the weather forecast when the main power generation facility is stopped and the purchase cost of purchasing the power required by the main power generation facility from an external power system is high. The control of the energy storage facility according to any one of claims 1 to 4, wherein the release of energy from the energy storage facility is controlled based on the prediction result and supplied to the main power generation facility. system. Prepare by installing the main power generation equipment, the renewable energy power generation equipment that generates power from renewable energy that is natural energy, and the energy storage equipment that stores the power generated by the renewable energy power generation equipment as energy. death,
The storage of energy in the energy storage facility is controlled according to the operating conditions and the weather of the main power generation facility so that the energy storage facility accumulates the required energy amount corresponding to the required power amount required by the main power generation facility. Further, it is possible to control how much the energy stored in the energy storage facility is released to the main power generation facility or the external power system according to the state of the main power generation facility and external factors including the weather prediction. A characteristic method for controlling energy storage equipment.

Images