Power generation system and control method

Abstract

A power generation system comprises a rotating electric machine, a plurality of storage batteries, a discharge control unit for controlling the discharging of the plurality of storage batteries, and an abnormality detection unit for detecting abnormalities in the storage batteries. When the power used to start the rotating electric machine is supplied from the plurality of storage batteries by the discharging from the multiple storage batteries and the abnormality detection unit has detected an abnormality in a storage battery, the discharge control unit increases the power discharged by other storage batteries having no abnormalities detected so as to cover the discharge portion from the storage battery having the abnormality detected, after the discharge portion from the storage battery having the abnormality detected has been supplied from a grid.

Description

[Technical Field]

[0001] This disclosure relates to a power generation system and a control method.This application claims priority to Japanese Patent Application No. 2022-076850, filed May 9, 2022, the contents of which are incorporated herein by reference. [Background technology]

[0002] Patent Document 1 describes a rotary machine (gas turbine power generator) in which a DC motor powered by a storage battery is used as a starter. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-150362 Summary of the Invention [Problem to be solved by the invention]

[0004] The rotary machine described in Patent Document 1 has a problem in that, for example, if an abnormality occurs in the storage battery, the rotary machine may not be able to start.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a power generation system and a control method that can appropriately respond to abnormalities in a storage battery that supplies power to a starting device of a rotating machine. [Means for solving the problem]

[0006] In order to solve the above problem, the power generation system of the present disclosure is a power generation system including a rotating machine, a plurality of storage batteries, a discharge control unit that controls the discharge of the plurality of storage batteries, and an abnormality detection unit that detects abnormalities in the storage batteries, wherein when the plurality of storage batteries are supplying power used to start the rotating machine by discharging from the plurality of storage batteries and the abnormality detection unit detects an abnormality in the storage batteries, the discharge control unit supplies the amount of power discharged from the storage battery in which the abnormality has been detected from the grid, and then increases the discharge power of the other storage batteries in which no abnormality has been detected to cover the amount of power discharged from the storage battery in which the abnormality has been detected.

[0007] The control method disclosed herein is a control method for a power generation system including a rotating machine, a plurality of storage batteries, a discharge control unit that controls the discharge of the plurality of storage batteries, and an abnormality detection unit that detects abnormalities in the storage batteries, wherein when the plurality of storage batteries are supplying power used to start the rotating machine by discharging from the plurality of storage batteries and the abnormality detection unit detects an abnormality in the storage batteries, the discharge control unit supplies the amount of discharge from the storage battery in which the abnormality has been detected from the grid, and then increases the discharge power of the other storage batteries in which no abnormality has been detected so as to cover the amount of discharge from the storage battery in which the abnormality has been detected. [Effects of the Invention]

[0008] According to the power generation system and control method of the present disclosure, it is possible to appropriately respond to an abnormality in a storage battery that supplies power to a start-up device of a gas turbine. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a configuration diagram illustrating a configuration example of a power generation system according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of operation of a power generation system according to an embodiment of the present disclosure. [Figure 3] FIG. 1 is a schematic diagram illustrating an example of a start-up process of a gas turbine according to an embodiment of the present disclosure. [Figure 4]FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 5] 4 is a flowchart illustrating an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 6] 4 is a flowchart illustrating an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 7] FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 8] FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 9] FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 10] 4 is a flowchart illustrating an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 11] 4 is a flowchart illustrating an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 12] FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 13] FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 14] FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 15] FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 16] FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 17] FIG. 2 is a schematic diagram for explaining an example of operation of the power generation system according to an embodiment of the present disclosure. [Figure 18] FIG. 1 is a schematic block diagram illustrating the configuration of a computer according to at least one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a power generation system and a control method according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 17. FIG. 1 is a configuration diagram illustrating an example of the configuration of a power generation system according to an embodiment of the present disclosure. FIG. 2 is a schematic diagram illustrating an example of the operation of a power generation system according to an embodiment of the present disclosure. FIG. 3 is a schematic diagram illustrating an example of the start-up process of a gas turbine according to an embodiment of the present disclosure. FIG. 4 is a schematic diagram for explaining an example of the operation of a power generation system according to an embodiment of the present disclosure. FIGS. 5 and 6 are flowcharts illustrating an example of the operation of a power generation system according to an embodiment of the present disclosure. FIGS. 7 to 9 are schematic diagrams for explaining an example of the operation of a power generation system according to an embodiment of the present disclosure. FIGS. 10 and 11 are flowcharts illustrating an example of the operation of a power generation system according to an embodiment of the present disclosure. FIGS. 12 to 17 are schematic diagrams for explaining an example of the operation of a power generation system according to an embodiment of the present disclosure. Note that the same or corresponding components in each drawing are designated by the same reference numerals, and description thereof will be omitted as appropriate.

[0011] (Power generation system configuration) As shown in FIG. 1 , a power generation system 1 according to this embodiment includes a power generation facility 2 and a power storage facility 3. An input / output line 11 for power of the power generation facility 2 is connected to a power transmission / distribution line 6 via a watt-hour meter 73. An input / output line 12 for power of the power storage facility 3 is connected to the power transmission / distribution line 6. An input / output line 13 for power of the production facility 4 is connected to the power transmission / distribution line 6. The power transmission / distribution line 6 is connected to a grid 5 via a transformer 72 and a watt-hour meter 71. The grid 5 is also referred to as a power system. In this embodiment, power input from the grid 5 to the power transmission / distribution line 6 is referred to as received power. Power output from the power generation facility 2 to the power transmission / distribution line 6 is referred to as generated power. Power input to the power generation facility 2 from the power transmission / distribution line 6 is referred to as power generation facility power consumption. Power output from the power storage facility 3 to the power transmission / distribution line 6 is referred to as discharged power. Power input to the power storage facility 3 from the power transmission / distribution line 6 is referred to as charged power. Power input to the production facility 4 from the power transmission / distribution line 6 is referred to as production facility power consumption. The production facility 4 is, for example, a facility in a factory, and consumes power supplied from a power transmission and distribution line 6 as a load. The system 5 is a system that generates, transforms, transmits, and distributes power. The part of the system 5 that transmits and distributes power is the grid 5a. The power transmission and distribution line 6 is also a grid. The power storage facility 3 is charged from the grid.

[0012] Figure 2 shows an example of daily changes in the received power supplied to the power generation system 1 and production facility 4 shown in Figure 1. The horizontal axis represents time, and the vertical axis represents received power. In the example shown in Figure 2, power generation facility 2 stops generating power at night and generates power only during the day. Until power generation facility 2 starts generating power, it receives power from the grid 5, including the startup power for power generation facility 2. Once power generation facility 2 has completed startup and starts generating power, power is supplied from power generation facility 2 to production facility 4, and the received power becomes zero.

[0013] (Configuration of power generation facilities) The power generation facility 2 includes a gas turbine combined cycle (GTCC) power generation system 20 (hereinafter referred to as the GTCC power generation system 20). The power generated by the power generation facility 2 is consumed, for example, as power consumed by production facilities or charging power, or is reversely flowed to the grid 5. The GTCC power generation system 20 includes a gas turbine 21, a generator 22, a steam turbine 23, a heat recovery steam generator 24, a condenser 25, an excitation thyristor rectifier 26, a GTCC control device 27, and auxiliary equipment (not shown). The generator 22 and the excitation thyristor rectifier 26 constitute a starting device 28. When starting the gas turbine 21, the starting device 28 drives the gas turbine 21 by using the generator 22 as a motor. The auxiliary equipment (not shown) includes, for example, pumps for delivering circulating water, feed water, lubricating oil, etc., a cooling fan, equipment in a monitoring room, etc.

[0014] The gas turbine 21 is one type of rotary machine, and includes an air compressor 211, a combustor 212, and a turbine 213. The gas turbine 21 is a prime mover that mixes air compressed by the air compressor 211 with natural gas fuel in the combustor 212, burns the resulting combustion gas, which is a fluid, and applies it to rotors in the turbine 213 to convert the kinetic energy of the fluid into rotational motion to obtain rotational power. The gas turbine 21 drives a generator 22. In this embodiment, the rotating machine is described as a gas turbine 21, but this is not limiting in other embodiments. In other embodiments, the rotating machine may be, for example, a gas turbine starter, a compressor, a turbo chiller, a pump, or the like.

[0015] The heat recovery boiler 24 generates steam by recovering exhaust heat from gas turbine exhaust gas 241 discharged from the gas turbine 21. The heat recovery boiler 24 also recovers exhaust heat from the gas turbine exhaust gas 241 and performs denitration treatment and the like, and then discharges the gas as heat recovery boiler exhaust gas 242, which is then discharged into the atmosphere from a chimney or the like (not shown).

[0016] The generator 22 is a synchronous electric machine, and is configured coaxially with the gas turbine 21 and the steam turbine 23. The generator 22 operates as a synchronous generator that converts the power of the gas turbine 21 and the steam turbine 23 into electric power and outputs it to the power transmission and distribution line 6. When the gas turbine 21 starts up, the generator 22 receives electric power supplied from the power transmission and distribution line 6 and operates as a synchronous motor.

[0017] The steam turbine 23 is a prime mover that applies steam generated in the heat recovery boiler 24 to a rotor to obtain rotational power.

[0018] The condenser 25 condenses the steam that has passed through the steam turbine 23. The water condensed by the condenser 25 is supplied to the heat recovery boiler 24 via a pump or the like.

[0019] The GTCC control device 27 receives detection signals from various sensors (not shown) and control signals from a higher-level control device (not shown) and controls various actuators in the power generation facility 2. For example, when the gas turbine 21 is started up, the GTCC control device 27 controls various parts of the gas turbine 21 and also controls the rotation speed and output torque of the starting device 28. The GTCC control device 27 also generates multiple types of signal signals in response to predetermined events that occur when the gas turbine is started up, and outputs these to a later-described power storage facility control device 34 in the power storage facility 3 via a communication line 81. Examples of predetermined events include the start of gas turbine startup, reaching a spin rotation speed, ignition, and a self-sustaining rotation speed. The signal signals include a gas turbine startup start signal, a spin rotation speed reach signal, an ignition signal, and a self-sustaining rotation speed signal, which correspond to the respective events, as well as a signal indicating the rotation speed (= rotational speed) of the gas turbine 21.

[0020] The start of gas turbine startup is an event in which the starting device 28 is started and begins to apply rotational torque to the gas turbine 21 in a turning state. The reaching of spin rotation speed is an event in which the gas turbine 21 in spin operation reaches a predetermined rotation speed suitable for purging the exhaust duct of the gas turbine 21. Here, spin operation, also known as cranking, is an operation in which the gas turbine 21 is driven only by the starting device 28 without fuel being supplied to the gas turbine 21. The purging operation is a spin operation for removing unburned fuel remaining in the combustor 212, ducts, etc. prior to ignition at startup. The ignition is an event in which fuel begins to burn due to the ignition operation. The self-sustaining rotation speed is an event in which the gas turbine 21 reaches or exceeds the rotation speed at which it can operate self-sustainably, i.e., maintain acceleration without receiving rotational torque from the starting device 28. The self-sustaining rotation speed indicates the completion of startup.

[0021] FIG. 3 schematically illustrates changes in the power generation equipment power consumption and gas turbine rotation speed when the gas turbine 21 is started. The horizontal axis represents time, and the vertical axis represents the power generation equipment power consumption and gas turbine rotation speed. The power generation equipment power consumption is indicated by a solid line. The gas turbine rotation speed is indicated by a dotted line. The power generation equipment power consumption includes the gas turbine startup power (power covered by discharge power) and auxiliary equipment power consumption. In FIG. 3, the gas turbine startup power amount (the area covered by discharge power) is indicated by a hatched area sloping upward to the right. The auxiliary equipment power consumption amount is indicated by a hatched area sloping downward to the right. The gas turbine startup power is the power consumed by the starting device 28. In the example illustrated in FIG. 3, startup of the gas turbine begins at time t1. The rotation speed of the gas turbine 21 reaches a predetermined spin rotation speed at time t2. Thereafter, the rotation speed of the gas turbine 21 is controlled to be approximately constant, and purge operation is performed. Then, ignition occurs at time t3. After ignition, the rotation speed of the gas turbine 21 increases and reaches the self-sustaining rotation speed at time t4. The gas turbine startup electric power increases at a generally constant rate from time t1 to time t2. The gas turbine startup electric power is generally constant from time t2 to time t3. The gas turbine startup electric power increases from time t3, becomes constant at a certain value, and then decreases from a certain time approaching time t4. At time t4, the electric power becomes zero. Note that the change at startup shown in FIG. 3 is an example, and application of this embodiment is not limited to this example.

[0022] (Configuration of the storage facility) The power storage facility 3 includes an AC / DC converter 31, three DC / DC converters 32, three storage battery packs 33, and a power storage facility control device 34. The AC / DC converter 31 is a bidirectional AC-DC converter that converts AC power input from the power transmission / distribution line 6 into DC power and outputs it to the DC / DC converter 32, and converts DC power input from the DC / DC converter 32 into AC power and outputs it to the power transmission / distribution line 6. The number of DC / DC converters 32 and storage battery packs 33 may be one each, or may be a multiple number other than three.

[0023] The DC / DC converter 32 is a bidirectional DC-DC converter that boosts or lowers the voltage of the DC power input from the AC / DC converter 31 and outputs it to the battery pack 33, and also boosts or lowers the voltage of the DC power input from the battery pack 33 and outputs it to the AC / DC converter 31. Furthermore, when discharging the DC power from the battery pack 33, for example, the DC / DC converter 32 controls the discharge power from the battery pack 33 in accordance with instructions from the power storage equipment control device 34, for example, by keeping the voltage of the DC power output to the AC / DC converter 31 at a constant value and changing the current. Each DC / DC converter 32 independently controls the discharge power from its corresponding battery pack 33 in accordance with instructions from the power storage equipment control device 34.

[0024] The battery pack 33 includes a circuit breaker 331, a storage battery 332, a sensor unit 333, and a monitoring device 334. The storage battery 332 is configured by combining a plurality of storage battery cells (single cells) or a storage battery module (battery assembly) including a plurality of storage battery cells. The storage battery cells are, for example, but not limited to, lithium-ion batteries. The storage battery 332 is discharged, for example, when the gas turbine 21 is started up. The circuit breaker 331 connects and disconnects the connection between the storage battery 332 and the DC / DC converter 32. The operation of the circuit breaker 331 is controlled by, for example, a monitoring device 334. The sensor unit 333 includes multiple types of sensors, detects the voltage, current, temperature, etc. of the storage battery 332, and outputs the detected results to the monitoring device 334. The monitoring device 334 acquires the detection results of the sensor unit 333, controls the circuit breaker 331, and calculates the SOC (State of Charge; charging rate or charging state) of the storage battery 332. Furthermore, the monitoring device 334 outputs the acquired detection results of the sensor unit 333 and information indicating the calculated SOC to the power storage equipment control device 34. Furthermore, when the monitoring device 334 detects a predetermined event such as overvoltage, overcurrent, or overheating based on the detection results of the sensor unit 333, it shuts off the circuit breaker 331 to protect the storage battery 332. At that time, the monitoring device 334 outputs a signal indicating that the circuit breaker 331 has been shut off to the power storage equipment control device 34. Furthermore, when the monitoring device 334 receives a predetermined instruction from the power storage equipment control device 34, it shuts off or connects the circuit breaker 331.

[0025] The power storage equipment control device 34 can be configured using, for example, a computer and its peripheral circuits and devices. The power storage equipment control device 34 has a functional configuration formed by a combination of hardware such as a computer and software such as a program, and includes a discharge control unit 341, a storage battery remaining energy calculation unit 342, a power difference calculation unit 343, and an abnormality detection unit 344.

[0026] The discharge control unit 341 controls the discharge of one or more storage batteries 332. In this embodiment, "controlling the discharge of the storage battery 332" means at least one of controlling the discharge power of the storage battery 332 and controlling the discharge power and amount of discharged power of the storage battery 332. When starting up the gas turbine 21, for example, if the remaining amount of power in the storage battery 332 is sufficient, the discharge control unit 341 controls the discharge power to a predetermined pattern to discharge the storage battery 332. Furthermore, when starting up the gas turbine 21, for example, if the remaining amount of power in the storage battery 332 is insufficient, the discharge control unit 341 changes the pattern to discharge the storage battery 332 so that the amount of discharged power does not exceed the remaining amount of power.

[0027] In this embodiment, the discharge control unit 341 controls discharge from the storage battery 332 in response to a predetermined event, for example, during startup of the gas turbine 21. The event includes at least one of the following events, which have been described above with reference to FIG. 3 : startup of the gas turbine 21, reaching the spin rotation speed, ignition, or the self-sustaining rotation speed. The discharge amount control unit 341 receives a signal indicating the event as a signal from the GTCC control device 27. The GTCC control device 27 is an example of a configuration of a control unit of the gas turbine 21.

[0028] In this embodiment, when starting up the gas turbine 21, the discharge control unit 341 controls the discharge from the storage battery 332 so that the power required to start up the gas turbine 21 can be covered by the power from the grid 5 and the discharge power from the storage battery 332.

[0029] In addition, when the power used to start the gas turbine 21 is supplied from multiple storage batteries 332 by discharging from the multiple storage batteries 332, if the abnormality detection unit 344 detects an abnormality in the storage battery 332, the discharge control unit 341 supplies the amount of discharge from the storage battery 332 in which the abnormality is detected from the grid 5a, and then increases the discharge power of the other storage batteries 332 in which no abnormality is detected to cover the amount of discharge from the storage battery 332 in which the abnormality is detected.

[0030] The battery remaining energy calculation unit 342 calculates the remaining energy of the storage battery 332. For example, the battery remaining energy calculation unit 342 acquires the SOC calculated by the monitoring device 334 and calculates the total remaining energy of the three storage batteries 332. Alternatively, the battery remaining energy calculation unit 342 calculates the remaining energy by calculating and integrating the charging power and discharging power based on the current and voltage detected by the monitoring device 334, for example.

[0031] The power difference calculation unit 343 calculates the power difference between the predicted value of received power from the grid 5 when the gas turbine 21 is started and the total power value available from the grid 5. For example, the power difference calculation unit 343 receives information indicating the predicted value of received power from a device that manages the production facility 4 via the communication line 81. FIG. 4 shows an example of calculating the power difference ΔMW. The horizontal axis represents time, and the vertical axis represents received power. In FIG. 4, the actual value of received power is represented by a solid rectangle, and the predicted value is represented by a dashed rectangle. The gas turbine startup power among the predicted values ​​is also indicated by a shaded area. In the example shown in FIG. 4, startup of the gas turbine 21 begins shortly after 8:30, and the received power peaks around 9:00, when the gas turbine startup power is at its maximum. The received power decreases from around 9:30, when the generator 22 starts outputting, and becomes zero after around 10:00. 4, the value of the maximum contracted power is set as the total available power value, and the power difference ΔMW is the value obtained by subtracting the predicted value MW of power received from the grid 5 at the time of startup of the gas turbine 21 from the value of the maximum contracted power. Note that the total available power value is not limited to the value of the maximum contracted power, and may be, for example, an upper limit value set to achieve a predetermined purpose.

[0032] The abnormality detection unit 344 detects an abnormality in the storage battery 332 based on information acquired from each monitoring device 334. An abnormality in the storage battery 332 may be, for example, when the monitoring device 334 shuts off the circuit breaker 331, or when the temperature of the storage battery 332 exceeds a predetermined temperature.

[0033] (Example of operation of power generation system 1) An example of operation at the start-up of the gas turbine 21 of the power generation system 1 shown in FIG. 1 will be described with reference to FIGS. 5 to 17. FIG. 5 shows a flow of basic operations at the start-up of the gas turbine 21. As shown in FIG. 5, in the power generation system 1, the power storage equipment control device 34 determines a discharge mode of the storage battery 332 at the start-up of the gas turbine 21 (step S1), and controls the discharge of the storage battery 332 in the determined discharge mode (step S2). In this embodiment, the discharge mode represents a manner of discharge from the power storage equipment 3. In this embodiment, as an example, the discharge modes are set to a mode in which no discharge is performed (discharge stop), a mode in which a relatively large amount of power from the storage battery 332 is used (large discharge mode), a mode in which the power of the storage battery 332 is used moderately (medium discharge mode), and a mode in which the power of the storage battery 332 is used only during peak times (small discharge mode), and any of these modes is used to perform or not perform discharge. The process shown in FIG. 5 may be started, for example, in response to a predetermined input operation by an operator, or may be started when a predetermined signal is received from the power generation facility 2 or the production facility 4, or when a preset time arrives.

[0034] Next, the process of determining the discharge mode (step S1) shown in FIG. 5 will be described. FIG. 6 shows the flow of step S1 for determining the discharge mode shown in FIG. 5. FIG. 7 shows an example of the large discharge mode. FIG. 8 shows an example of the medium discharge mode. FIG. 9 shows an example of the small discharge mode. FIGS. 7 to 9 show the same example of power generation equipment power consumption as shown in FIG. 3. However, in FIGS. 7 to 9, the gas turbine startup power amount shown by the diagonal hatching in FIG. 3 is divided into the diagonal hatching (area covered by discharge power) and the white area (area covered by received power). In the large discharge mode shown in FIG. 7, the areas covered by the gas turbine startup power and the discharge power match throughout the entire period from the start of startup to the self-sustaining rotation speed. In the medium discharge mode shown in FIG. 8, an area covered by received power is set for part of the period from ignition to the self-sustaining rotation speed. In the small discharge mode shown in FIG. 9, an area covered by received power is set for the entire period from the start of gas turbine startup to ignition and for part of the period from ignition to the self-sustaining rotation speed. In this operation example, it is assumed that before starting the gas turbine 21, an amount of electricity sufficient to cover at least the amount of discharge electricity in the small discharge mode (for example, enough to perform multiple startups) is stored in the power storage equipment 3.

[0035] 6, the power difference calculation unit 343 acquires the received power prediction value MW [W] (step S10) and calculates the power difference ΔMW (step S11). Next, the storage battery remaining energy calculation unit 342 calculates the remaining energy BR [Wh] of the storage battery 332 (step S12).

[0036] Next, the discharge control unit 341 determines whether the power difference ΔMW [W] is greater than "0" (step S13). If the power difference ΔMW [W] is greater than "0" (step S13: YES), the discharge control unit 341 determines the discharge mode to "discharge stop" (step S14) and ends the process shown in FIG. 6. If the power difference ΔMW [W] is not greater than "0" (step S13: NO), the discharge control unit 341 determines whether the remaining energy BR is greater than the discharge energy [Wh] in the large discharge mode (step S15). Here, the discharge energy [Wh] in the large discharge mode corresponds to the area of ​​the shaded portion sloping upward to the right in FIG. 7.

[0037] If the remaining power amount BR is greater than the discharge power amount [Wh] in the heavy discharge mode (step S15: YES), the discharge control unit 341 determines the discharge mode to be the "heavy discharge mode" (step S16) and ends the process shown in Fig. 6. If the remaining power amount BR is not greater than the discharge power amount [Wh] in the heavy discharge mode (step S15: NO), the discharge control unit 341 determines whether the remaining power amount BR is greater than the discharge power amount [Wh] in the medium discharge mode (step S17). Here, the discharge power amount [Wh] in the medium discharge mode corresponds to the area of ​​the shaded portion sloping upward to the right in Fig. 8.

[0038] If the remaining power amount BR is greater than the discharge power amount [Wh] of the medium discharge mode (step S17: YES), the discharge control unit 341 determines the discharge mode to be the "medium discharge mode" (step S18) and ends the processing shown in Fig. 6. If the remaining power amount BR is not greater than the discharge power amount [Wh] of the medium discharge mode (step S17: NO), the discharge control unit 341 determines the discharge mode to be the "small discharge mode" (step S19) and ends the processing shown in Fig. 6.

[0039] The determination processes in steps S13, S15, and S17 may be performed with a certain margin of error to determine the magnitude relationship. For example, in step S13, instead of determining whether the value is greater than "0," it may be determined whether the value is greater than a certain margin of error "α" (α>0).

[0040] Next, the discharge control process (step S2) shown in Fig. 5 will be described. Fig. 10 shows the flow of step S2 for controlling discharge shown in Fig. 5. Fig. 11 shows the flow of the process executed in the process for controlling discharge from the storage battery 332 in Fig. 10 (steps S23, S24, S26, and S28).

[0041] In the process shown in FIG. 10 , the discharge power from the power storage facility 3 is controlled in accordance with the patterns shown in FIGS. 7 to 9 , triggered by the reception of a predetermined signal. For example, in the large discharge mode shown in FIG. 7 , discharge from the power storage facility 3 is started after a gas turbine startup start signal is received at time t1. Thereafter, the discharge power is increased at a predetermined rate of increase according to the elapsed time from time t1. Thereafter, when a spin rotation speed reach signal is received at time t2, the discharge power is controlled to a predetermined constant value. Thereafter, when an ignition signal is received at time t3, the discharge power is gradually increased at a predetermined rate of increase according to the elapsed time from time t3. Then, when the discharge power reaches a predetermined value, the discharge power is controlled to a predetermined constant value. Thereafter, for example, when the elapsed time from time t3 reaches a predetermined value, the discharge power is decreased at a predetermined rate of decrease. Thereafter, when a self-sustaining rotation speed signal is received at time t4, the discharge from the power storage facility 3 is stopped. Note that the control of the discharge power is not limited to this, and the discharge power may be increased or decreased according to, for example, the rotation speed of the gas turbine 21.

[0042] In the process shown in FIG. 10 , first, the discharge control unit 341 determines whether the discharge mode is discharge stop (step S20). If the discharge mode is discharge stop (step S20: YES), the discharge control unit 341 ends the process shown in FIG. 10 without discharging from the power storage facility 3. If the discharge mode is not discharge stop (step S20: NO), the discharge control unit 341 waits for reception of a gas turbine startup start signal (repeatedly repeating step S21: NO). When the gas turbine startup start signal is received (step S21: YES), the discharge control unit 341 determines whether the discharge mode is a large discharge mode or a medium discharge mode (step S22). If the discharge mode is a large discharge mode or a medium discharge mode (step S22: YES), the discharge control unit 341 starts discharging from the storage battery 332 (step S23). Next, the discharge control unit 341 increases the discharge power at a predetermined increase rate according to the elapsed time since the gas turbine startup start signal was received (step S24). Next, the discharge control unit 341 determines whether or not a spin rotation speed reach signal has been received (step S25). If the spin rotation speed reach signal has not been received (step S25: NO), the discharge control unit 341 again increases the discharge power at a predetermined increase rate according to the elapsed time since the gas turbine startup start signal was received (step S24). The processes of steps S24 and S25 are executed at a fixed cycle (i.e., a fixed waiting time is set between repeated processes).

[0043] If the spin rotation speed reach signal has been received (step S25: YES), the discharge control unit 341 controls the discharge power at a constant predetermined value (step S26). Next, the discharge control unit 341 determines whether or not an ignition signal has been received (step S27). If the ignition signal has not been received (step S27: NO), the discharge control unit 341 continues to control the discharge power at a constant predetermined value (step S26). The processing of step S26 and the processing of step S27 are executed at regular intervals.

[0044] On the other hand, if the discharge mode is not the large discharge mode or the medium discharge mode (step S22: NO), the discharge control unit 341 waits for reception of an ignition signal (step S31: NO is repeated).

[0045] If an ignition signal is received in step S27 or step S31 (step S27: YES or step S31: YES), the discharge control unit 341 controls the discharge power in a predetermined pattern according to the discharge mode (step S28). Next, the discharge control unit 341 determines whether or not a self-sustaining rotation speed signal is received (step S29). If a self-sustaining rotation speed signal is not received (step S29: NO), the discharge control unit 341 continues to control the discharge power in a predetermined pattern according to the discharge mode (step S28). The processing of step S28 and the processing of step S29 are executed at regular intervals.

[0046] If the self-sustaining rotation speed signal has been received (step S29: YES), the discharge control unit 341 stops discharging from the storage battery 332 (step S30), and ends the process shown in FIG.

[0047] Next, the process shown in Fig. 11 will be described. As described above, the process shown in Fig. 11 is the process executed in steps S23, S24, S26, and S28 shown in Fig. 10. When the process shown in Fig. 11 starts, the discharge control unit 341 first determines the total discharge power of all the storage batteries (step S40).

[0048] When the process shown in FIG. 11 is executed in step S23, the total discharge power of all the storage batteries is determined only once, at a power appropriate for the start of discharge. When the process shown in FIG. 11 is executed in step S24, the total discharge power of all the storage batteries is determined so that the power increases at a predetermined rate each time the process is executed. When the process shown in FIG. 11 is executed in step S26, the total discharge power of all the storage batteries is always determined to a constant predetermined value. When the process shown in FIG. 11 is executed in step S28, the total discharge power of all the storage batteries is determined according to the patterns shown in FIGS. 7 to 9 each time the process is executed.

[0049] Next, the discharge control unit 341 allocates the total discharge power of all the storage batteries equally to each storage battery 332 (step S41). For example, if the total discharge power of all the storage batteries is P, in this embodiment, P / 3 of power is allocated equally to the three storage batteries 332.

[0050] Next, the discharge control unit 341 determines whether or not the abnormality detection unit 344 has detected an abnormality in the storage battery 332 (step S42). On the other hand, if no abnormality has been detected (step S42: NO), the discharge control unit 341 controls the discharge of each storage battery 332 so that the discharge power becomes the allocated discharge power (step S44), and ends the process shown in FIG.

[0051] On the other hand, if an abnormality is detected (step S42: YES), the discharge control unit 341 increases the discharge power of the other storage batteries 332 for which no abnormality has been detected so as to cover the amount of discharge from the storage battery 332 for which the abnormality has been detected (step S43). For example, if an abnormality is detected in one storage battery 332, the discharge control unit 341 sets the discharge power allocated to that storage battery 332 to "0" and increases the amount of discharge power allocated to the other storage batteries 332 to P / 2. Next, the discharge control unit 341 controls the discharge of each storage battery 332 to the allocated discharge power (step S44), and ends the process shown in FIG. 11.

[0052] As described above, the processes of steps S24, S26, and S28 are executed at regular intervals. Therefore, for example, in the case of an abnormality in which the circuit breaker 331 is tripped by the monitoring device 334, a delay of, for example, about the same period occurs between the tripping of the circuit breaker 331 and the increase in the discharge power of the other storage batteries 332. In this case, when the power used to start the gas turbine 21 is supplied from the multiple storage batteries 332 by discharging from the multiple storage batteries 332, if the abnormality detection unit 344 detects an abnormality in the storage battery 332, the discharge control unit 341 supplies the amount of power discharged from the storage battery 332 in which the abnormality was detected from the grid 5a (or the transmission / distribution line 6), and then increases the discharge power of the other storage batteries 332 in which no abnormality was detected to cover the amount of power discharged from the storage battery 332 in which the abnormality was detected.

[0053] 12 to 14 show an example of operation when the circuit breaker 331 of one of the three storage batteries 332 is tripped during startup of the gas turbine 21. In FIGS. 12 to 14, the three storage batteries 332 are designated as storage battery 332(A), storage battery 332(B), and storage battery 332(C). FIG. 12 shows a state in which storage battery 332(C) stops discharging when startup power P is supplied equally from storage battery 332(A), storage battery 332(B), and storage battery 332(C) by P / 3 each during startup of the gas turbine 21. In this case, as shown in FIG. 13, power of P / 3 is supplied from grid 5a before the discharge power of the other storage batteries 332(A) and 332(B) is increased. Thereafter, when the discharge power of the storage batteries 332(A) and 332(B) increases, the supply of power from the grid 5a stops, as shown in FIG. 14, and power supply to the starting device 28 continues only from the storage batteries 332(A) and 332(B).

[0054] 15 to 17 show examples of the discharge power and the change over time in the amount of discharged power from the storage battery 332(A), the storage battery 332(B), and the storage battery 332(C) when the gas turbine 21 is started up. The solid line represents the discharge power from the power storage facility 3. The dashed line represents the amount of discharged power from the power storage facility 3. The chain lines represent the amount of discharged power from each of the storage batteries 332(A), 332(B), and 332(C). FIG. 15 shows a case where the storage batteries 332(A), 332(B), and 332(C) are all normal. FIG. 16 shows a case where the storage battery 332(C) stops discharging at time t11. In this case, the storage batteries 332(A) and 332(B) increase their discharge power at time t12. In this case, the drop in discharged power from time t11 to time t12 is supplied from the grid 5a. 17 shows a case where the storage battery 332(C) stops discharging immediately before the start of startup. In this case, the storage batteries 332(A) and 332(B) increase their discharge power from the start of startup.

[0055] (Actions and Effects) As described above, in the power generation system 1 of this embodiment, when the discharge control unit 341 is supplying power used for starting up the gas turbine 21 from the plurality of storage batteries 332 by discharging from the plurality of storage batteries 332, if the abnormality detection unit 344 detects an abnormality in the storage battery 332, the discharge control unit 341 supplies the amount of discharge from the storage battery 332 in which the abnormality has been detected from the grid 5a (or the power transmission and distribution line 6 as the grid), and then increases the discharge power of the other storage batteries 332 in which no abnormality has been detected so as to cover the amount of discharge from the storage battery 332 in which the abnormality has been detected. Therefore, it is possible to appropriately respond to an abnormality in the storage battery 332 that supplies power to the start-up device 28 of the gas turbine 21.

[0056] The storage battery 332 is discharged during any period from the start of startup of the gas turbine 21 to the completion of startup of the gas turbine 21. According to this configuration, the capacity of the storage battery 332 can be set appropriately.

[0057] Furthermore, the storage battery 332 is discharged during any period from the ignition of the gas turbine 21 to the completion of the start-up of the gas turbine 21. According to this configuration, the capacity of the storage battery 332 can be set appropriately.

[0058] Furthermore, charging 332 of the storage battery is performed from the grid 5a (or the power transmission and distribution line 6 as the grid).

[0059] Furthermore, the discharge control unit 341 equally controls the discharge power from each of the multiple storage batteries 332. With this configuration, the capacity of the storage batteries 332 can be set appropriately.

[0060] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure. In the above embodiment, the discharge control unit 341, the battery remaining energy calculation unit 342, the power difference calculation unit 343, and the abnormality detection unit 344 are configured to be provided within the power storage equipment 3, but this is not limited to this, and they may also be provided within the GTCC control device 27, for example.

[0061] <Computer Configuration> FIG. 18 is a schematic block diagram illustrating the configuration of a computer according to at least one embodiment. The computer 90 includes a processor 91 , a main memory 92 , a storage 93 , and an interface 94 . The above-described power storage equipment control device 34 and GTCC control device 27 are implemented in a computer 90. The operations of the above-described processing units are stored in the form of programs in a storage 93. A processor 91 reads the programs from the storage 93, loads them into a main memory 92, and executes the above-described processes in accordance with the programs. The processor 91 also allocates storage areas in the main memory 92 corresponding to the above-described storage units in accordance with the programs.

[0062] The program may be for realizing some of the functions to be performed by the computer 90. For example, the program may be combined with other programs already stored in storage or other programs implemented in other devices to perform the functions. In other embodiments, the computer may include a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device) in addition to or instead of the above configuration. Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, some or all of the functions realized by the processor may be realized by the integrated circuit.

[0063] Examples of storage 93 include a hard disk drive (HDD), a solid state drive (SSD), a magnetic disk, a magneto-optical disk, a compact disc read-only memory (CD-ROM), a digital versatile disc read-only memory (DVD-ROM), and a semiconductor memory. Storage 93 may be an internal medium directly connected to the bus of computer 90, or an external medium connected to computer 90 via interface 94 or a communication line. Furthermore, when this program is distributed to computer 90 via a communication line, computer 90 that receives the program may load the program into main memory 92 and execute the above-described processing. In at least one embodiment, storage 93 is a non-transitory tangible storage medium.

[0064] <Additional Notes> The power generation system 1 described in each embodiment can be understood, for example, as follows.

[0065] (1) A power generation system 1 according to a first aspect includes a rotating machine (gas turbine 21), a plurality of storage batteries 332, a discharge control unit 341 that controls the discharge of the plurality of storage batteries, and an abnormality detection unit 344 that detects an abnormality in the storage batteries. When the abnormality detection unit detects an abnormality in a storage battery while the plurality of storage batteries are discharging power to be used for starting the rotating machine, the discharge control unit supplies the amount of power discharged from the storage battery in which the abnormality is detected from a grid (grid 5a, power transmission / distribution line 6), and then increases the discharge power of the other storage batteries in which no abnormality is detected to cover the amount of power discharged from the storage battery in which the abnormality is detected. According to this aspect and the following aspects, an abnormality in the storage battery 332 that supplies power to a starting device 28 of the rotating machine can be appropriately addressed.

[0066] (2) The power generation system 1 according to a second aspect is the power generation system 1 according to (1), in which the storage battery 332 is discharged during a period from the start of startup of the rotating machine to the completion of startup of the rotating machine. According to this aspect, the capacity of the storage battery 332 for supplying power to the start-up device 28 of the gas turbine 21 can be appropriately set.

[0067] (3) The power generation system 1 according to a third aspect is the power generation system 1 according to (1) or (2), in which the rotary machine is a gas turbine.

[0068] (4) The power generation system 1 according to a fourth aspect is the power generation system 1 according to (3), in which the storage battery is discharged during a period from ignition of the gas turbine to completion of startup of the gas turbine. According to this aspect, the capacity of the storage battery 332 for supplying power to the start-up device 28 of the gas turbine 21 can be appropriately set.

[0069] (5) The power generation system 1 according to a fifth aspect is the power generation system 1 according to any one of (1) to (4), wherein the storage battery is charged from the grid.

[0070] (6) The power generation system 1 according to a sixth aspect is the power generation system 1 according to any one of (1) to (5), wherein the discharge control unit controls the discharge power from each of the plurality of storage batteries equally. According to this aspect, the capacity of the storage battery 332 for supplying power to the starting device 28 of the rotating machine can be appropriately set. [Industrial Applicability]

[0071] According to the power generation system and control method of the present disclosure, it is possible to appropriately respond to an abnormality in a storage battery that supplies power to a starting device of a rotary machine. [Explanation of symbols]

[0072] 1...Power generation system 2...Power generation facilities 3...Electricity storage equipment 4. Production facilities 5...Strain 5a...Grid 6...Power transmission and distribution lines (grid) 20...GTCC power generation system 21...Gas turbine (rotating machine) 22...Generator 27...GTCC control device (control unit) 28…Starting device 332...storage battery 341...Discharge control unit 342...Battery remaining power calculation unit 343...Power difference calculation unit 344...Abnormality detection unit

Claims

1. A rotating machine; A plurality of batteries; a discharge control unit that controls discharge of the plurality of storage batteries; an abnormality detection unit that detects an abnormality in the storage battery; A power generation system comprising: When the abnormality detection unit detects an abnormality in a storage battery in a case where power used for starting the rotating machine is supplied from the plurality of storage batteries by discharging from the plurality of storage batteries, the discharge control unit supplies from the grid the amount of discharge from the storage battery in which the abnormality is detected, and then increases the discharge power of the other storage batteries in which no abnormality is detected so as to cover the amount of discharge from the storage battery in which the abnormality is detected. Power generation system.

2. The storage battery is discharged during any period from the start of startup of the rotary machine to the completion of startup of the rotary machine. The power generation system according to claim 1 .

3. the rotary machine is a gas turbine; The power generation system according to claim 1 or 2.

4. The storage battery is discharged during any period from the ignition of the gas turbine to the completion of startup of the gas turbine. The power generation system according to claim 3 .

5. The battery is charged from the grid The power generation system according to claim 4 .

6. The discharge control unit controls the discharge power from each of the plurality of storage batteries equally. The power generation system according to claim 5 .

7. A rotating machine; A plurality of batteries; a discharge control unit that controls discharge of the plurality of storage batteries; an abnormality detection unit that detects an abnormality in the storage battery; A control method for a power generation system comprising: When the abnormality detection unit detects an abnormality in a storage battery in a case where power used for starting the rotating machine is supplied from the plurality of storage batteries by discharging from the plurality of storage batteries, the discharge control unit supplies from the grid the amount of discharge from the storage battery in which the abnormality is detected, and then increases the discharge power of the other storage batteries in which no abnormality is detected so as to cover the amount of discharge from the storage battery in which the abnormality is detected. Control method.

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