Power generation system

Abstract

The present invention provides a power generation system that reduces the backflow of exhaust gas discharged from the power generation unit. [Solution] The power generation system comprises a plurality of power generation units, a first discharge unit connected to each of the plurality of power generation units and which discharges the exhaust gas discharged from each of the plurality of power generation units together, and a control unit. The control unit controls at least one of the plurality of power generation units so that the exhaust gas flow rate discharged from the first discharge unit is equal to or greater than the exhaust gas flow rate when all of the plurality of power generation units have started generating power, after all of the plurality of power generation units have started generating power.

Description

Technical Field

[0007] , , [Figure 1]

[0001] The present disclosure relates to a power generation system.

Background Art

[0002] In recent years, power generation systems including a plurality of power generation units have been known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Regarding power generation systems, there is room for improvement in reducing the backflow of exhaust gas discharged from the power generation units.

Means for Solving the Problems

[0005] One aspect of the present disclosure includes a plurality of power generation units, a first discharge unit connected to each of the plurality of power generation units and discharging the exhaust gas discharged from each of the plurality of power generation units together, and a control unit. The control unit controls at least one of the plurality of power generation units so that the exhaust gas flow rate discharged from the first discharge unit is not less than the exhaust gas flow rate when all of the plurality of power generation units are generating power after all of the plurality of power generation units have started generating power.

Effects of the Invention

[0006] Compared with the case where the configuration of the present disclosure is not used, it is possible to reduce the backflow of exhaust gas discharged from the power generation units in the power generation system.

Brief Description of the Drawings

[0007] [Figure 1]Figure 1 shows the configuration of the power generation system according to the embodiment and modification example 1. [Figure 2] Figure 2 shows the configuration of a power generation unit according to an embodiment. [Figure 3] Figure 3 shows the configuration of the power generation system according to modification example 2. [Figure 4] Figure 4 shows the configuration of the power generation system according to modification example 3. [Figure 5] Figure 5 shows a power generation management method according to an embodiment. [Modes for carrying out the invention]

[0008] Embodiments will be described below with reference to the drawings. In the drawings, the same reference numerals are used for parts having the same configuration and function, and the drawings are schematic representations.

[0009] [Embodiment] (Power generation system) As shown in Figure 1, the power generation system 1 according to this embodiment includes a power conversion unit 2, an integrated control unit 10, a power generation unit 20, and a first discharge unit 40. In this embodiment, the power generation system 1 includes one power generation unit 20. However, the power generation system 1 may include a plurality of power generation units 20.

[0010] <Power Conversion Unit> The power conversion unit 2 converts the DC power supplied from the power generation unit 30 into AC power or DC power. The power conversion unit 2 includes, for example, a DC / DC converter or a DC / AC converter. DC power is supplied to the power conversion unit 2 from multiple power generation units 20.

[0011] <Integrated Control Unit> As shown in Figure 1, the integrated control unit 10 comprises a first communication unit 11, a first storage unit 12, and a first control unit 13. The integrated control unit 10 may remotely control multiple power generation units 20 or power generation units 30 via a communication line.

[0012] The first communication unit 11 communicates with the power generation unit 20 or the power generation unit 30. The first communication unit 11 receives, for example, drive information for the oxygen-containing gas supply unit 34, the fuel gas supply unit 35 or the reformed water supply unit 36, temperature information for the power generation unit 30, signals to execute the stop process for the power generation unit 30, and control signals. The first communication unit 11 transmits, for example, control signals. The first communication unit 11 includes a communication module capable of communicating with the power generation unit 20 or the power generation unit 30. The communication module is a module compliant with the communication standard between the integrated control unit 10 and the power generation unit 20, or between the integrated control unit 10 and the power generation unit 30. Communication between the integrated control unit 10 and the power generation unit 20, or between the integrated control unit 10 and the power generation unit 30, may be wired or wireless. The first communication unit 11 may also include a communication module capable of communicating with external devices such as a remote controller. The first communication unit 11 may have the functions of the first control unit 13.

[0013] The first storage unit 12 stores data related to the integrated control unit 10. The first storage unit 12 includes semiconductor memory, magnetic memory, optical memory, or a combination thereof. The first storage unit 12 may also function as a main memory, auxiliary memory, or cache memory.

[0014] The first control unit 13 controls the integrated control unit 10, the power generation unit 20, or the power generation section 30. The first control unit 13, for example, generates control signals. The first control unit 13 includes a processor, dedicated circuits, or a combination thereof. The processor is, for example, a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The processor may be a dedicated processor specialized for a specific process. The dedicated circuit may be, for example, an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit). The first control unit 13 may have the functions of the first communication unit 11.

[0015] <Power generation unit> As shown in FIG. 1, the power generation unit 20 includes a unit integrated control unit 21 and a power generation unit 30. Each of the plurality of power generation units 30 included in the power generation unit 20 is electrically connected in series.

[0016] First, the unit integrated control unit 21 will be described. As shown in FIG. 1, the unit integrated control unit 21 includes a second communication unit 22, a second storage unit 23, and a second control unit 24. The unit integrated control unit 21 may remotely control a plurality of power generation units 30 through a communication line.

[0017] The second communication unit 22 communicates with the integrated control unit 10 or the power generation unit 30. The second communication unit 22 receives, for example, drive information of the oxygen-containing gas supply unit 34, the fuel gas supply unit 35, or the reformed water supply unit 36, temperature information of the power generation unit 30, a signal for executing a stop process of the power generation unit 30, and a control signal. The second communication unit 22 transmits, for example, a signal for executing a stop process or a control signal. The second communication unit 22 includes a communication module capable of communicating with the integrated control unit 10 or the power generation unit 30. The communication module is a module compliant with the communication standard between the integrated control unit 10 and the power generation unit 20, or between the power generation unit 20 and the power generation unit 30. The communication between the integrated control unit 10 and the power generation unit 20, or between the power generation unit 20 and the power generation unit 30 may be wired or wireless. The second communication unit 22 may include a communication module capable of communicating with an external device such as a remote controller. The second communication unit 22 may have the function of the second control unit 24.

[0018] The second storage unit 23 stores data related to the unit integrated control unit 21. The second storage unit 23 includes a semiconductor memory, a magnetic memory, an optical memory, or a combination thereof. The second storage unit 23 may function as a main storage device, an auxiliary storage device, or a cache memory.

[0019] The second control unit 24 controls the power generation unit 20 or the power generation section 30. The second control unit 24, for example, creates a control signal. The second control unit 24 includes a processor, a dedicated circuit, or a combination thereof. The processor is, for example, a processor such as a CPU (Central Processing Unit) or a G PU (Graphics Processing Unit). The processor may be a dedicated processor specialized for specific processing. The dedicated circuit is, for example, an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), etc. The second control unit 24 may have the function of the second communication unit 22.

[0020] As shown in FIG. 2, the power generation section 30 includes a third communication unit 31, a third storage unit 32, a third control unit 33, an oxygen-containing gas supply unit 34, a fuel gas supply unit 35, a reformed water supply unit 36, and a power generation module 37.

[0021] The third communication unit 31 communicates with the integrated control unit 10 or the power generation unit 20. The third communication unit 31, for example, receives drive information of the oxygen-containing gas supply unit 34, the fuel gas supply unit 35, or the reformed water supply unit 36, temperature information of the power generation section 30, and a control signal. The first communication unit 11, for example, transmits a signal for executing a stop process of the power generation section 30. The third communication unit 31 includes a communication module capable of communicating with the integrated control unit 10 or the power generation unit 20. The communication module is a module compliant with the communication standard between the integrated control unit 10 and the power generation section 30, or between the unit integrated control unit 21 and the power generation section 30. The communication between the integrated control unit 10 and the power generation section 30, or between the unit integrated control unit 21 and the power generation section 30 may be wired or wireless. The third communication unit 31 may include a communication module capable of communicating with an external device such as a remote controller. The third communication unit 31 may have the function of the third control unit 33.

[0022] The third storage unit 32 stores data related to the power generation unit 30. The third storage unit 32 includes semiconductor memory, magnetic memory, optical memory, or a combination thereof. The third storage unit 32 may also function as a main memory, auxiliary memory, or cache memory.

[0023] The third control unit 33 controls each part of the power generation unit 30. The third control unit 33 generates, for example, a signal to execute a stop process. The third control unit 33 includes a processor, a dedicated circuit, or a combination thereof. The processor is, for example, a CPU (Central Processing Unit) or GP. This is a processor such as a U (Graphics Processing Unit). The processor may be a dedicated processor specialized for a specific process. The dedicated circuit may be, for example, an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit). The third control unit 33 may have the functions of the third communication unit 31.

[0024] The oxygen-containing gas supply unit 34 supplies oxygen-containing gas to the power generation module 37. The oxygen-containing gas supply unit 34 may supply air as the oxygen-containing gas. The oxygen-containing gas supply unit 34 controls the flow rate of oxygen-containing gas supplied to the power generation module 37 based on the control instructions of the third control unit 33. The oxygen-containing gas supply unit 34 is connected to the power generation module 37. The connection between the oxygen-containing gas supply unit 34 and the power generation module 37 may include piping or valves, etc. The oxygen-containing gas supply unit 34 includes a blower, etc. The oxygen-containing gas supply unit 34 is Alternatively, air taken in from the outside may be heated and supplied to the power generation module 37. This reduces the decrease in temperature inside the power generation module 37 due to the air taken in from the outside, which may improve the power generation efficiency of the power generation module 37.

[0025] The oxygen-containing gas supply unit 34 may communicate with the third control unit 33. The oxygen-containing gas supply unit 34 may transmit drive information of the oxygen-containing gas supply unit 34 to the third control unit 33, indicating the rotation speed or drive number of the blades of the oxygen-containing gas supply unit 34.

[0026] The oxygen-containing gas flow meter 341 measures the flow rate of oxygen-containing gas flowing through the piping or valves between the oxygen-containing gas supply unit 34 and the power generation module 37. The oxygen-containing gas flow meter 341 is attached to the piping or valves between the oxygen-containing gas supply unit 34 and the power generation module 37. The oxygen-containing gas flow meter 341 transmits the measurement result of the oxygen-containing gas flow rate to the third control unit 33.

[0027] The fuel gas supply unit 35 supplies fuel gas to the power generation module 37. The fuel gas supply unit 35 may supply methane-containing gas as fuel gas. The fuel gas supply unit 35 controls the flow rate of fuel gas supplied to the power generation module 37 based on control instructions from the third control unit 33. The fuel gas supply unit 35 is connected to the power generation module 37. The connection between the fuel gas supply unit 35 and the power generation module 37 may include piping or valves. The fuel gas supply unit 35 includes a pump or the like.

[0028] The fuel gas supply unit 35 may communicate with the third control unit 33. The fuel gas supply unit 35 may transmit drive information of the fuel gas supply unit 35 to the third control unit 33, indicating the rotational speed or drive number of the blades of the fuel gas supply unit 35.

[0029] The fuel gas flow meter 351 measures the flow rate of fuel gas flowing through the piping or valves between the fuel gas supply unit 35 and the power generation module 37. The fuel gas flow meter 351 is installed in the piping or valves between the fuel gas supply unit 35 and the power generation module 37. The fuel gas flow meter 351 transmits the measurement result of the fuel gas flow rate to the third control unit 33.

[0030] The reformed water supply unit 36 ​​supplies reformed water to the power generation module 37. Based on the control instructions of the third control unit 33, the reformed water supply unit 36 ​​controls the flow rate of reformed water supplied to the power generation module 37. The reformed water supply unit 36 ​​is connected to the power generation module 37. The connection between the reformed water supply unit 36 ​​and the power generation module 37 may include piping or valves. The reformed water supply unit 36 ​​includes a pump.

[0031] The reformed water supply unit 36 ​​may communicate with the third control unit 33. The reformed water supply unit 36 ​​may transmit drive information of the reformed water supply unit 36 ​​to the third control unit 33, indicating the rotation speed or drive number of the blades of the reformed water supply unit 36.

[0032] The reformed water flow meter 361 measures the flow rate of reformed water flowing through the piping or valves between the fuel gas supply unit 35 and the power generation module 37. The reformed water flow meter 361 is installed in the piping or valves between the fuel gas supply unit 35 and the power generation module 37. The reformed water flow meter 361 transmits the measured flow rate of the reformed water to the third control unit 33.

[0033] The power generation module 37 generates electricity by an electrochemical reaction using a hydrogen-containing fuel gas and an oxygen-containing gas supplied from the oxygen-containing gas supply unit 34. The power generation module 37 includes a fuel cell module. The power generation module 37 is not limited to one, but may consist of two or more modules. The power generation module 37 may also include a reformer. The reformer uses reformed water supplied from the reformed water supply unit 36 ​​and raw fuel gas supplied from the fuel gas supply unit 35. It generates a fuel gas containing hydrogen.

[0034] A fuel cell stack is a solid oxide fuel cell (SOFC). ) may also be used. However, the fuel cell stack is not limited to solid oxide fuel cells.

[0035] The power generation module 37 is equipped with a temperature sensor 371. The temperature sensor 371 detects the temperature of the power generation module 37. The temperature sensor 371 is located in a position where it can detect the temperature of the power generation module 37. The temperature sensor 371 transmits the temperature detection result of the power generation module 37 to the third control unit 33.

[0036] The temperature sensor 371 may transmit temperature information to the third control unit 33 indicating the detection result of the temperature of the power generation module 37.

[0037] <1st discharge section> As shown in Figure 1, the first discharge section 40 discharges exhaust gas from each of the power generation modules 37 included in the multiple power generation units 30. The first discharge section 40 is composed of exhaust gas discharge pipes 41 connected to each of the multiple power generation units 30. The first discharge section 40 is connected to each of the exhaust gas discharge pipes 41 of the multiple power generation units 30. The first discharge section 40 includes an outlet 42 for discharging exhaust gas to the outside.

[0038] The exhaust gas discharge pipe 41 includes, for example, piping. The exhaust gas discharge pipe 41 has two ends. Of the two ends included in the exhaust gas discharge pipe 41, one end is connected to the power generation unit 30 and the other end is connected to the first discharge unit 40.

[0039] (Processing by the integrated control unit) <External pressure> As shown in Figure 1, when the power generation unit 20 includes multiple power generation units 30, the exhaust gas flow rate discharged from the first discharge unit 40 remains constant from the time all of the multiple power generation units 30 start generating power. On the other hand, the exhaust gas flow rate through the first discharge unit 40 may change due to, for example, an increase in the amount of power generated by the power generation units 30, a rise in the temperature of the power generation units 30, a decrease in the flow rate of oxygen-containing gas supplied to the power generation module 37, or a decrease in the flow rate of fuel gas in the power generation module 37. As a result, the internal pressure of the first discharge unit 40 may become lower than the external pressure, which is the pressure from the outside. Consequently, the exhaust gas discharged from the first discharge unit 40 may flow back into the first discharge unit 40.

[0040] Therefore, the first control unit 13 increases the exhaust gas flow rate of at least one of the multiple power generation units 30 so that it is equal to or greater than the exhaust gas flow rate when all of the multiple power generation units 30 are generating power. Here, "all of the multiple power generation units 30 have started generating power" includes, for example, a state in which all of the multiple power generation units 30 start generating power simultaneously. Also, "all of the multiple power generation units 30 have started generating power" includes, for example, a state in which the multiple power generation units 30 generate power in stages and finally all of the power generation units 30 start generating power. As a result, in this embodiment, the exhaust gas flow rate that flows in the first direction toward the outlet 42 can be increased, and the backflow of exhaust gas discharged from the first outlet 40 into the first outlet 40 can be reduced. The first control unit 13 may, for example, increase the exhaust gas flow rate that flows in the first direction by reducing the exhaust gas flow rate discharged from some of the power generation units 30 that control the exhaust gas flow rate, while increasing the exhaust gas flow rate discharged from the remaining power generation units 30 whose exhaust gas flow rate has not been reduced.

[0041] <Power generation unit shutdown process> In the power generation system 1, for example, if some of the power generation units 30 among the multiple power generation units 30 stop In some cases, a shutdown process may be performed. When such a shutdown process is performed, the internal pressure of the first discharge section 40 may become lower than the external pressure.

[0042] Here, "stop" includes normal stop and abnormal stop. A normal stop is a state in which power generation by the power generation module 37 is stopped, but the oxygen-containing gas supply unit 34 is not stopped, and the operation of the power generation unit 30 is stopped while the temperature of the fuel cell stack is lowered using the oxygen-containing gas supply unit 34. A normal stop is a state that is performed, for example, during periodic maintenance of the power generation system 1. On the other hand, an abnormal stop is a state in which not only power generation by the power generation module 37 but also the entire operation of the power generation unit 30 is stopped immediately. An abnormal stop is a state that is performed, for example, in response to a relatively serious abnormality, or in a state that is performed when a normal stop cannot be performed. An abnormal stop may also be called a shutdown stop. Here, the stop process may be performed based on information from the outside and based on instructions from the first control unit 13, or based on instructions from the third control unit 33 depending on the state of the power generation unit 30.

[0043] When some of the multiple power generation units 30 perform a shutdown process, that is, when the multiple power generation units 30 include a first power generation unit that performs a shutdown process and a second power generation unit that does not perform a shutdown process. In such a case, the amount of power generated by the first power generation unit decreases during the shutdown process, and as a result, the exhaust gas flow rate discharged from the first power generation unit decreases. Therefore, the total amount of exhaust gas discharged from each of the multiple power generation units 30 decreases by the amount of the exhaust gas flow rate discharged from the first power generation unit. As a result, the exhaust gas discharged from the first discharge unit 40 may flow back into the first discharge unit 40.

[0044] Therefore, the first control unit 13 increases the exhaust gas flow rate of the second power generation unit so that it is equal to or greater than the exhaust gas flow rate when all of the multiple power generation units 30 are generating power. That is, the first control unit 13 increases the exhaust gas flow rate of at least one of the multiple power generation units 30 so that the total amount of exhaust gas flow rate discharged from the multiple power generation units 30 is equal to or greater than the total amount of exhaust gas flow rate immediately before the first power generation unit stops. The first control unit 13 may, for example, control the fuel gas supply unit 35 so that the flow rate of fuel gas supplied to the power generation module 37 increases in order to increase the exhaust gas flow rate of the power generation unit 30. The first control unit 13 may, for example, control the oxygen-containing gas supply unit 34 so that the flow rate of oxygen-containing gas supplied to the power generation module 37 increases in order to increase the exhaust gas flow rate of the power generation unit 30. The first control unit 13 may, for example, control the power generation unit 30 so that the temperature of the power generation unit 30 decreases in order to increase the exhaust gas flow rate of the power generation unit 30. As a result, the total amount of exhaust gas flow rate discharged from each of the multiple power generation units 30 does not decrease below the total amount of exhaust gas flow rate immediately before the first power generation unit stops. Therefore, the amount of exhaust gas flowing in the first direction toward the outlet 42 can be increased, thereby reducing the amount of exhaust gas discharged from the first discharge unit 40 flowing back into the first discharge unit 40. The first control unit 13 may, for example, increase the amount of exhaust gas flowing in the first direction by reducing the amount of exhaust gas discharged from some of the power generation units 30 whose exhaust gas flow rate is controlled, while increasing the amount of exhaust gas discharged from the remaining power generation units 30 whose exhaust gas flow rate is not reduced.

[0045] Here, the first control unit 13 may, for example, increase the exhaust gas flow rate to the first direction by controlling the oxygen-containing gas supply unit 34 of the second power generation unit so that the flow rate of oxygen-containing gas is higher than the flow rate of oxygen-containing gas when the first power generation unit is stopped. As a result, the amount of unreacted oxygen-containing gas discharged from the power generation module 37 of the second power generation unit to the combustion unit increases, and the amount of oxygen-containing gas burned in the combustion unit increases. Therefore, the exhaust gas flow rate to the first direction toward the outlet 42 can be increased, and the backflow of exhaust gas discharged from the first outlet 40 into the first outlet 40 can be reduced.

[0046] Furthermore, the first control unit 13 supplies, for example, oxygen to the power generation module 37 of the second power generation unit. The exhaust gas flow rate flowing to the first direction may be increased by controlling the oxygen-containing gas supply unit 34 of the second power generation unit so that the total flow rate of the contained gas is equal to or greater than the total flow rate of the oxygen-containing gas supplied to each of the multiple power generation units 30 immediately before the first power generation unit stops.

[0047] The third control unit 33 may increase the exhaust gas flow rate to the first direction by controlling the oxygen-containing gas supply unit 34 based on a control instruction from the first control unit 13 to change the flow rate of the oxygen-containing gas.

[0048] When the first control unit 13 changes the flow rate of the oxygen-containing gas, it may also control the flow rate of the fuel gas and the reformed water, as described later, so as not to change them.

[0049] The first communication unit 11 receives, for example, a signal indicating that the first power generation unit will perform a stop process, or a signal from each power generation unit 30 indicating that a stop process is in progress or that the unit is stopped. In such a case, the first control unit 13 creates a control signal to control the exhaust gas flow rate of the multiple power generation units 30. The first communication unit 11 transmits the control signal to the third communication unit 31. The control signal may be a signal instructing the power generation unit 30 to perform a stop process.

[0050] During the shutdown process, the internal pressure of the first discharge unit 40 may decrease. Therefore, the first control unit 13 may control the rate of increase of the flow rate of oxygen-containing gas supplied to the second power generation unit according to the rate of decrease in the internal pressure of the first discharge unit 40. Specifically, if the rate of decrease in the internal pressure of the first discharge unit 40 is low, that is, if the internal pressure of the first discharge unit 40 decreases gradually, the first control unit 13 may control the rate of increase of the flow rate of oxygen-containing gas supplied to the second power generation unit to increase gradually.

[0051] Furthermore, if the rate of decrease in the internal pressure of the first discharge section 40 is high, that is, if the internal pressure of the first discharge section 40 drops rapidly, the first control unit 13 may control the rate of increase in the flow rate of the oxygen-containing gas supplied to the second power generation section to be higher. This allows the control unit to more accurately track fluctuations in the internal pressure of the first discharge section 40, thereby reducing the backflow of exhaust gas discharged from the first discharge section 40.

[0052] <Temperature drop in power generation module> When the flow rate of oxygen-containing gas supplied to the power generation module 37 of the second power generation unit is increased in the power generation system 1, the temperature of the power generation module 37 supplied with oxygen-containing gas may decrease. This decrease in the temperature of the power generation module 37 may lead to misfires or a decrease in power generation efficiency.

[0053] Therefore, the first control unit 13 raises the temperature of the second power generation unit by controlling it so that the temperature obtained by the temperature sensor 371 is above a predetermined temperature. This reduces the possibility of the power generation module 37 misfiring.

[0054] Here, the first control unit 13 controls the fuel gas supply unit 35 of the second power generation unit so that, for example, the flow rate of fuel gas increases compared to the flow rate of fuel gas when the first power generation unit is stopped. The third control unit 33 controls the fuel gas supply unit 35 based on the control instructions from the first control unit 13. As a result, the amount of unreacted fuel gas discharged from the power generation module 37 of the second power generation unit to the combustion unit increases, and the amount of fuel gas burned in the combustion unit increases, causing the temperature of the power generation module 37 of the second power generation unit to rise. Therefore, even if the temperature of the power generation module 37 of the second power generation unit, which is supplied with oxygen-containing gas, decreases, the possibility of the power generation module 37 misfiring can be reduced.

[0055] Furthermore, the first control unit 13 controls, for example, the flow rate of the reformed water when the first power generation unit stops. The reformed water supply unit 36 ​​of the second power generation unit is controlled so that the flow rate is lower than that of the water. The third control unit 33 controls the reformed water supply unit 36 ​​based on the control instructions from the first control unit 13. As a result, the flow rate of reformed water supplied to the power generation module 37 of the second power generation unit is reduced, and the amount of reformed water reformed in the reformer is reduced, thereby reducing the heat of vaporization lost in the power generation module 37 of the second power generation unit. Therefore, when the temperature of the power generation module 37 of the second power generation unit, which is supplied with oxygen-containing gas, drops, the decrease in the temperature of the power generation module 37 can be reduced. This reduces the decrease in the power generation efficiency of the power generation module 37.

[0056] Here, the first control unit 13 may set priorities considering the impact on the power generation module 37 when ensuring that the temperature acquired by the temperature sensor 371 is above a predetermined temperature. For example, the first control unit 13 may prioritize the control to increase the flow rate of fuel gas in the power generation module 37 of the second power generation unit over the control to decrease the flow rate of reformed water. This makes it possible to maintain the temperature of the power generation module 37 above a predetermined temperature while reducing the decrease in power generation efficiency of the power generation module 37 due to the decrease in the flow rate of reformed water. For example, the first control unit 13 may decrease the flow rate of reformed water supplied to the power generation module 37 of the second power generation unit when the flow rate of fuel gas supplied to the power generation module 37 of the second power generation unit cannot be increased any further.

[0057] The first control unit 13 controls the multiple power generation units 20 such that the current value flowing through the multiple power generation units 30 when the first power generation unit stops is greater than the current value flowing through the multiple power generation units 30 when all of the multiple power generation units 30 are generating power. As a result, the amount of unreacted fuel gas discharged from the power generation module 37 of the second power generation unit to the combustion unit increases, and the amount of fuel gas burned in the combustion unit increases, causing the temperature of the power generation module 37 of the second power generation unit to rise. Therefore, even if the temperature of the power generation module 37 supplied with oxygen-containing gas decreases, the possibility of the power generation module 37 misfiring can be reduced.

[0058] Furthermore, the third control unit 33 described above may execute each control based on instructions from the first control unit 13, or it may execute each control based on a judgment made by each third control unit 33 according to the status of the power generation unit 30.

[0059] [Example of change 1] This section will primarily describe the differences between the first modified embodiment and the embodiment described above. In this modified embodiment 1, an example will be described in which the first control unit 13 increases the amount of exhaust gas flowing in the first direction at the connection point between the exhaust gas discharge pipe 41 of the first power generation unit and the first discharge unit 40. In addition, in this modified embodiment 1, an example will be described in which the first control unit 13 increases the amount of exhaust gas flowing in the first direction at the connection point between the exhaust gas discharge pipe 41 of the second power generation unit and the first discharge unit 40.

[0060] (Processing by the integrated control unit) <Shutdown procedure for the first power generation unit> As shown in Figure 1, when the power generation unit 20 includes multiple power generation units 30, the multiple power generation units 30 may include a first power generation unit that performs a stop process and a second power generation unit that is further from the outlet 42 than the first power generation unit and does not perform a stop process. In such cases, the pressure in the exhaust gas discharge pipe 41 connected to each of the multiple power generation units 30 may be lower than the pressure in the first discharge unit 40. As a result, exhaust gas discharged from the power generation units 30 may flow back from the first discharge unit 40 into the exhaust gas discharge pipe 41.

[0061] Therefore, the first control unit 13 controls, for example, the exhaust gas discharge pipe 41 of the first power generation unit and the first discharge unit 40 The exhaust gas flow rate of the second power generation unit is increased so that the exhaust gas flow rate in the first direction at the connection point increases. If there are multiple second power generation units, the first control unit 13 may consider the deterioration state of the second power generation units or the deterioration state of the oxygen-containing gas supply unit 34. For example, the first control unit 13 may reduce the exhaust gas flow rate discharged from some of the second power generation units while increasing the exhaust gas flow rate discharged from the remaining second power generation units whose exhaust gas flow rate has not been reduced. For example, the first control unit 13 calculates the deterioration state using the drive information of the oxygen-containing gas supply unit 34 or the temperature information of the power generation unit 30. For example, the first control unit 13 may increase the exhaust gas flow rate of the second power generation unit when the third control unit 33 creates a signal to execute a stop process. For example, the first control unit 13 may increase the exhaust gas flow rate of the second power generation unit when the third communication unit 31 receives a control signal from the first communication unit 11. The first control unit 13 may, for example, increase the exhaust gas flow rate of the second power generation unit so that the exhaust gas flow rate is higher than the exhaust gas flow rate immediately before the first power generation unit stops. This increases the exhaust gas flow rate toward the first direction. In other words, the flow velocity of the exhaust gas flowing through the first discharge unit 40 increases. Immediately before the first power generation unit performs the stop process, the exhaust gas flows outward from the first discharge unit 40. After the first power generation unit performs the stop process, the exhaust gas flowing through the first discharge unit 40 attempts to flow back into the first power generation unit. However, as shown in Figure 1, since the first discharge unit 40 and the exhaust gas discharge pipe 41 are connected vertically, a pressure loss occurs in the exhaust gas at the connection point between the first discharge unit 40 and the exhaust gas discharge pipe 41 of the first power generation unit when the exhaust gas flows from the first discharge unit 40 to the first power generation unit. Therefore, it becomes difficult for the exhaust gas to flow from the first discharge unit 40 toward the first power generation unit. In this case, increasing the flow velocity of the exhaust gas flowing into the first discharge section 40 increases the pressure loss, thereby reducing backflow from the first discharge section 40 to the first power generation section.

[0062] Here, the first control unit 13 may increase the exhaust gas flow rate by controlling the oxygen-containing gas supply unit 34 of the second power generation unit so that the flow rate of the oxygen-containing gas is greater than the flow rate of the oxygen-containing gas when the first power generation unit is stopped.

[0063] The multiple power generation units 30 may include a first power generation unit that performs a stop process, and a second power generation unit that is the closest to the first power generation unit among the power generation units 30 that are closer to the outlet 42 than the first power generation unit, and does not perform a stop process. The first control unit 13 increases the exhaust gas flow rate of the second power generation unit, for example, so that the exhaust gas flow rate in the first direction increases at the connection point between the exhaust gas discharge pipe 41 of the second power generation unit and the first discharge unit 40. The first control unit 13 increases the exhaust gas flow rate of the second power generation unit, for example, so that the exhaust gas flow rate is higher than the exhaust gas flow rate immediately before the first power generation unit stops. As a result, the flow velocity of the exhaust gas flowing in the first direction increases at the connection point between the exhaust gas discharge pipe 41 of the second power generation unit and the first discharge unit 40. After the first power generation unit performs the stop process, the exhaust gas flowing through the first discharge unit 40 attempts to flow back into the first power generation unit. However, immediately before the first power generation unit stops, the exhaust gas flows in the first direction at the connection point between the exhaust gas discharge pipe 41 of the second power generation unit and the first discharge unit 40. Therefore, increasing the flow velocity of the exhaust gas flowing in the first direction can reduce the backflow toward the first power generation unit against the flow toward the first direction.

[0064] Here, the first control unit 13 controls the oxygen-containing gas supply unit 34 of the second power generation unit so that the flow rate of oxygen-containing gas increases compared to the flow rate of oxygen-containing gas when the first power generation unit is stopped. As a result, the flow velocity of exhaust gas flowing in the first direction increases at the connection point between the exhaust gas discharge pipe 41 of the second power generation unit and the first discharge unit 40. Therefore, it is possible to reduce backflow towards the first power generation unit against the flow from the first discharge unit 40 toward the outside.

[0065] When the first control unit 13 changes the flow rate of the oxygen-containing gas, it may also control the flow rate of the fuel gas and the reformed water, as described later, so as not to change them.

[0066] The first communication unit 11 transmits a control signal to, for example, the third communication unit 31. This control signal may be a signal instructing the power generation unit 30 to perform a stop process. Alternatively, this control signal may be a signal instructing the exhaust gas flow rate through the first discharge unit 40 to increase.

[0067] [Example of change 2] Regarding the second modified embodiment, the differences from the embodiment described above will be explained primarily. In this second modified embodiment, an example will be described in which the first control unit 13 increases the exhaust gas flow rate in the first direction at the connection point where the first discharge unit 40 and the exhaust gas discharge pipe 41 of the first power generation unit are connected.

[0068] (Processing by the integrated control unit) <Shutdown procedure for the first power generation unit> As shown in Figure 3, when the power generation unit 20 includes multiple power generation units 30, the multiple power generation units 30 may include a first power generation unit that performs a stop process and a second power generation unit that does not perform a stop process. In such cases, the pressure in the exhaust gas discharge pipe 41 connected to each of the multiple power generation units 30 may be lower than the pressure in the first discharge unit 40. As a result, exhaust gas discharged from the power generation units 30 may flow back from the first discharge unit 40 into the exhaust gas discharge pipe 41.

[0069] Therefore, the first control unit 13 increases the exhaust gas flow rate of the second power generation unit, for example, so that the exhaust gas flow rate in the first direction increases at the connection point where the first discharge unit 40 and the exhaust gas discharge pipe 41 of the first power generation unit are connected. The first control unit 13 may increase the exhaust gas flow rate of the second power generation unit so that the exhaust gas flow rate in the first direction at the connection point where the first discharge unit 40 and the exhaust gas discharge pipe 41 of the first power generation unit are connected is higher than the exhaust gas flow rate immediately before the first power generation unit stops. As a result, the exhaust gas flow rate in the first direction increases at the connection point where the first discharge unit 40 and the exhaust gas discharge pipe 41 of the first power generation unit are connected. In other words, the flow velocity of the exhaust gas flowing in the first direction increases at the connection point where the first discharge unit 40 and the exhaust gas discharge pipe 41 of the first power generation unit are connected. Immediately before the first power generation unit performs the stop process, the exhaust gas flows from the first discharge unit 40 outwards. After the first power generation unit has performed the shutdown process, the exhaust gas flowing through the first discharge unit 40 attempts to flow back into the first power generation unit. However, as shown in Figure 3, since the first discharge unit 40 and the exhaust gas discharge pipe 41 are connected, a pressure loss occurs in the exhaust gas at the connection point between the first discharge unit 40 and the exhaust gas discharge pipe 41 when the exhaust gas flows from the first discharge unit 40 to the first power generation unit. Therefore, it becomes difficult for the exhaust gas to flow from the first discharge unit 40 towards the first power generation unit. Increasing the flow velocity of the exhaust gas flowing through the first discharge unit 40 increases the pressure loss, thus reducing the backflow from the first discharge unit 40 to the first power generation unit.

[0070] Here, the first control unit 13 controls the oxygen-containing gas supply unit 34 of the second power generation unit so that, for example, the flow rate of the oxygen-containing gas increases compared to the flow rate of the oxygen-containing gas when the first power generation unit is stopped. As a result, the flow velocity of the exhaust gas flowing in the first direction increases at the connection point between the exhaust gas discharge pipe 41 of the second power generation unit and the first discharge unit 40. Therefore, a pressure loss occurs in the exhaust gas as it flows from the first discharge unit 40 to the first power generation unit, thus reducing backflow from the first discharge unit 40 to the first power generation unit.

[0071] [Example of change 3] This section will primarily describe the differences between the three modified embodiments described above and the third modified embodiment. In this third modified embodiment, the power generation system 1 is described as having a second discharge unit 50 connected to each of the multiple first discharge units 40, which collects the exhaust gas discharged from each of the multiple first discharge units 40 and discharges it to the outside.

[0072] (Power generation system) As shown in Figure 4, the power generation system 1 according to the modified embodiment 3 comprises an integrated control unit 10, power generation units 20, a first discharge unit 40, and a second discharge unit 50. The power generation system 1 includes three power generation units 20. However, the power generation system 1 is not limited to including multiple power generation units 20, but may include one or any number of power generation units 20.

[0073] <Second discharge section> As shown in Figure 4, the second discharge section 50 discharges the exhaust gas from each of the multiple first discharge sections 40 together. The second discharge section 50 discharges the exhaust gas from each of the multiple first discharge sections 40 together. The second discharge section 50 is connected to each of the multiple first discharge sections 40. The second discharge section 50 includes an outlet 51 for discharging the exhaust gas to the outside.

[0074] (Processing by the integrated control unit) <External pressure> As shown in Figure 4, when the power generation unit 20 includes multiple power generation units 30, the exhaust gas flow rate discharged from the second discharge unit 50 remains constant from the time all of the multiple power generation units 30 start generating power. In such cases, changes in the exhaust gas flow rate through the second discharge unit 50 can cause the internal pressure of the second discharge unit 50 to become lower than the external pressure. As a result, the exhaust gas discharged from the second discharge unit 50 may flow back into the second discharge unit 50.

[0075] Therefore, the first control unit 13 controls the exhaust gas flow rate of at least one of the multiple power generation units 20 so that it is equal to or greater than the exhaust gas flow rate when all of the multiple power generation units 30 are generating electricity. As a result, the total amount of exhaust gas flow rate discharged from each of the multiple power generation units 20 does not decrease below the total amount of exhaust gas flow rate immediately before the exhaust gas flow rate flowing through the second discharge unit 50 changes. For this reason, in this embodiment, backflow of exhaust gas discharged from the second discharge unit 50 can be reduced. The first control unit 13 may, for example, increase the exhaust gas flow rate flowing to the second direction by reducing the exhaust gas flow rate discharged from some of the multiple power generation units 30 included in the power generation unit 20 whose exhaust gas flow rate is controlled, while increasing the exhaust gas flow rate discharged from the remaining power generation units 30 whose exhaust gas flow rate is not reduced.

[0076] <Shutdown procedure for the first power generation unit> When the first power generation unit performs a shutdown procedure, the internal pressure of the second discharge unit 50 may become lower than the external pressure.

[0077] Therefore, the first control unit 13 controls the exhaust gas flow rate of at least one of the multiple power generation units 20 so that it is equal to or greater than the exhaust gas flow rate when all of the multiple power generation units 30 are generating power. The third control unit 33 may increase the exhaust gas flow rate discharged from the first discharge unit 40 by reducing the exhaust gas flow rate discharged from some of the multiple power generation units 30 included in the power generation unit 20 whose exhaust gas flow rate is controlled, while increasing the exhaust gas flow rate discharged from the remaining power generation units 30 whose exhaust gas flow rate is not reduced. As a result, the total amount of exhaust gas flow rate discharged from each of the multiple power generation units 20 does not decrease below the total amount of exhaust gas flow rate immediately before the first power generation unit performs the stop process. Therefore, it is possible to reduce the backflow of exhaust gas discharged from the second discharge unit 50 into the second discharge unit 50.

[0078] Multiple power generation units 20 may include a first power generation unit which includes a first power generation section, and the first power generation unit may include a first power generation section which performs a shutdown process and a second power generation section which does not perform a shutdown process. In such cases, the amount of exhaust gas discharged from the first power generation section decreases during the process of performing the shutdown process. Therefore, the exhaust gas flow discharged from the first power generation section which performs the shutdown process As the amount decreases, the exhaust gas flow rate discharged from the first power generation unit, including the first power generation section, also decreases. Therefore, when the first power generation section performs a shutdown procedure, there is a risk that exhaust gas discharged from multiple power generation units 20 other than the first power generation unit to the second discharge section 50 may flow back into the first discharge section 40 of the first power generation unit.

[0079] Therefore, the first control unit 13 controls the exhaust gas flow rate of at least one of the multiple power generation units 20 so that the exhaust gas flow rates discharged from the first discharge section 40 of each of the multiple power generation units 20 are the same. Here, "the exhaust gas flow rates are the same" includes cases where the exhaust gas flow rates are the same or where they are considered to be the same. "Cases where they are considered to be the same" means, for example, when the exhaust gas flow rate is within an error range of ±5% from the reference value. Based on the control instructions from the first control unit 13, the third control unit 33 may increase or decrease the exhaust gas flow rate discharged from the first discharge section 40 by decreasing the exhaust gas flow rate discharged from some of the multiple power generation sections 30 included in the power generation unit 20 whose exhaust gas flow rate is being controlled, while increasing the exhaust gas flow rate discharged from the remaining power generation sections 30 whose exhaust gas flow rate is not being reduced. This reduces the backflow of exhaust gas discharged from the first discharge section 40 from the power generation unit 20 with a high exhaust gas flow rate to the power generation unit 20 with a low exhaust gas flow rate in the multiple power generation units 20.

[0080] Here, the first control unit 13 may, for example, control the exhaust gas flow rate of the multiple power generation units 20 according to the number of first power generation units included in the first power generation unit. The third control unit 33 may, based on the control instructions from the first control unit 13, increase or decrease the exhaust gas flow rate discharged from the first discharge unit 40 by reducing the exhaust gas flow rate discharged from some of the multiple power generation units 30 included in the power generation unit 20 whose exhaust gas flow rate is controlled, while increasing the exhaust gas flow rate discharged from the remaining power generation units 30 whose exhaust gas flow rate is not reduced. This makes it possible to make the exhaust gas flow rate discharged from each of the multiple power generation units 20 uniform among the multiple power generation units 20. As a result, it is possible to reduce the backflow of exhaust gas discharged from the first discharge unit 40 from the power generation unit 20 with a high exhaust gas flow rate to the power generation unit 20 with a low exhaust gas flow rate in the multiple power generation units 20.

[0081] Furthermore, the first control unit 13 may, for example, control the exhaust gas flow rate of power generation units 20 other than the first power generation unit, such that the exhaust gas flow rate of the power generation units 20 other than the first power generation unit, which has the largest number of first power generation units, is reduced to the exhaust gas flow rate of the first power generation unit. The third control unit 33 may, based on a control instruction from the first control unit 13, reduce the exhaust gas flow rate discharged from some of the power generation units 30 among the multiple power generation units 30 included in the power generation unit 20 whose exhaust gas flow rate is controlled, while increasing the exhaust gas flow rate discharged from the remaining power generation units 30 whose exhaust gas flow rate is not reduced, thereby reducing the exhaust gas flow rate discharged from the first discharge unit 40 of the first power generation unit.

[0082] The first control unit 13 may control the exhaust gas flow rate of power generation units 20 other than the first power generation unit 20, such that the exhaust gas flow rate of the power generation units 20 other than the first power generation unit which has the fewest first power generation units increases to the exhaust gas flow rate of the first power generation unit. The third control unit 33 may increase the exhaust gas flow rate discharged from the first discharge unit 40 by reducing the exhaust gas flow rate discharged from some of the power generation units 30 among the multiple power generation units 30 included in the power generation unit 20 whose exhaust gas flow rate is controlled, while increasing the exhaust gas flow rate discharged from the remaining power generation units 30 whose exhaust gas flow rate is not reduced. As a result, the exhaust gas flow rate discharged from each of the multiple power generation units 20 becomes uniform among the power generation units 20. This reduces the likelihood of exhaust gas discharged from 40 flowing back into the first discharge section 40 other than the first power generation unit.

[0083] The first communication unit 11 receives, for example, a signal indicating that some of the multiple power generation units 30 execute a stop process, or a signal from each power generation unit 30 indicating that a stop process is in progress or that it is stopped. In such a case, the first control unit 13 creates a control signal to control the multiple power generation units 30. The first communication unit 11 transmits the control signal to the third communication unit 31. The control signal may be a signal instructing the power generation unit 30 to execute a stop process. Alternatively, the control signal may be a control signal to control the multiple power generation units 20.

[0084] (Power generation management method) Figure 5 shows a power generation management method according to an example of an embodiment. In the following description, the case in which the first power generation unit shuts down will be used as an example.

[0085] In step S1, the first communication unit 11 receives a signal from the third communication unit 31 to execute the stop process for the first power generation unit.

[0086] In step S2, the first control unit 13 creates a control signal for controlling the second power generation unit of the power generation unit 20, which includes the first power generation unit.

[0087] In step S3, the first communication unit 11 transmits a control signal to the third communication unit 31 of the second power generation unit.

[0088] In step S4, the third control unit 33 controls the oxygen-containing gas supply unit 34 of the second power generation unit in accordance with the control signal received by the third communication unit 31. Specifically, the third control unit 33 controls the flow rate of oxygen-containing gas supplied to the power generation module 37 of the second power generation unit when the first power generation unit stops to increase to a level greater than or equal to the flow rate of oxygen-containing gas supplied to the power generation module 37 of the first power generation unit.

[0089] In step S5, the third control unit 33 acquires temperature information from the temperature sensor 371 of the power generation module 37 of the second power generation unit.

[0090] In step S6, the third control unit 33 controls the fuel gas supply unit 35 of the second power generation unit so that when the temperature in the power generation module 37 of the second power generation unit is below a predetermined temperature, the flow rate of the fuel gas increases to a level higher than the flow rate of the fuel gas when the first power generation unit is stopped.

[0091] In step S7, the third control unit 33 acquires temperature information and drive information for the fuel gas supply unit 35 from the power generation module 37 of the second power generation unit.

[0092] In step S8, the third control unit 33 acquires drive information for the fuel gas supply unit 35 if the temperature of the power generation module 37 of the second power generation unit remains below a predetermined temperature. If the drive of the fuel gas supply unit 35 is at its upper limit, the third control unit 33 controls the reformed water supply unit 36 ​​of the second power generation unit so that the flow rate of reformed water in the power generation module 37 of the second power generation unit increases to the flow rate of reformed water when the first power generation unit is stopped.

[0093] While this disclosure has been described based on the drawings and embodiments, it should be noted that those skilled in the art will find it easy to make various modifications or alterations based on this disclosure. Therefore, it should be noted that these modifications or alterations are within the scope of this disclosure. For example, the functions, etc., included in each functional part can be rearranged in a way that is logically consistent. Multiple functional parts, etc., may be combined into one or separated. Each embodiment relating to this disclosure described above will be explained separately. The embodiments described herein are not limited to being implemented strictly according to the respective embodiments, but can be implemented by combining features or omitting parts as appropriate. In other words, the contents of this disclosure can be modified and altered in various ways by those skilled in the art. Therefore, these modifications and alterations are included within the scope of this disclosure. For example, in each embodiment, each functional part, each means or each step can be added to or replaced with functional parts, each means or each step in other embodiments in a logically consistent manner. Also, in each embodiment, multiple functional parts, each means or each step can be combined into one or divided. Furthermore, the embodiments of this disclosure described above are not limited to being implemented strictly according to the respective embodiments described, but can also be implemented by combining features or omitting parts as appropriate. [Explanation of Symbols]

[0094] 1. Power generation system 2 Power Conversion Unit 10 Integrated Control Unit 11. First Communications Department 12 1st memory section 13. First Control Unit 20 power generation units 21 Unit Integrated Control Unit 22. Second Communications Department 23 2nd memory section 24 Second Control Unit 30 Power Generation Department 31. Third Communications Department 32 Third memory section 33 Third Control Unit 34. Oxygen-containing gas supply unit 341 Oxygen-containing gas flow meter 35 Fuel Gas Supply Unit 351 Fuel gas flow meter 36. Water Treatment Supply Department 361 Reformed Water Flow Meter 37 Power generation modules 371 Temperature Sensor 40 1st discharge section 41 Exhaust gas discharge pipe 42 Outlet 50 2nd discharge section 51 Outlet

Claims

1. Multiple power generation units, A first discharge unit is connected to each of the aforementioned multiple power generation units and discharges the exhaust gas discharged from each of the aforementioned multiple power generation units together, It comprises a control unit and, The control unit controls at least one of the plurality of power generation units so that the exhaust gas flow rate discharged from the first discharge unit is equal to or greater than the exhaust gas flow rate when all of the plurality of power generation units have started generating power, after all of the plurality of power generation units have started generating power.

2. When the plurality of power generation units include a first power generation unit that stops and a second power generation unit that does not stop, The power generation system according to claim 1, wherein the control unit controls the second power generation unit to increase the exhaust gas flow rate discharged from the second power generation unit to the first discharge unit.

3. Each of the aforementioned plurality of power generation units further comprises a power generation module and an oxygen-containing gas supply unit that supplies oxygen-containing gas to the power generation module. The power generation system according to claim 2, wherein the control unit controls the oxygen-containing gas supply unit of the second power generation unit so that the flow rate of the oxygen-containing gas supplied to the power generation module of the second power generation unit increases compared to the flow rate of the oxygen-containing gas supplied to the power generation module of the second power generation unit when the first power generation unit is stopped.

4. The power generation system according to claim 3, wherein the control unit controls the oxygen-containing gas supply unit of the second power generation unit so that the flow rate of the oxygen-containing gas supplied to the power generation module of the second power generation unit when the first power generation unit stops increases to or exceeds the flow rate of the oxygen-containing gas supplied to the power generation module of the first power generation unit.

5. Each of the aforementioned multiple power generation units is further equipped with a temperature sensor, The power generation system according to claim 3, wherein the control unit controls at least one of the plurality of power generation units so that the temperature obtained by the temperature sensor becomes equal to or equal to a predetermined temperature.

6. Each of the plurality of power generation units further comprises a fuel gas supply unit that supplies fuel gas to the power generation module. The power generation system according to claim 4, wherein the control unit controls the fuel gas supply unit of the second power generation unit so that the flow rate of the fuel gas supplied to the power generation module of the second power generation unit increases compared to the flow rate of the fuel gas supplied to the power generation module of the second power generation unit when the first power generation unit is stopped.

7. Each of the aforementioned multiple power generation units further comprises a reformed water supply unit that supplies reformed water to the power generation module. The power generation system according to claim 3, wherein the control unit controls the reformed water supply unit of the second power generation unit so that the flow rate of the reformed water supplied to the power generation module of the second power generation unit is less than the flow rate of the reformed water supplied to the power generation module of the second power generation unit when the first power generation unit is stopped.

8. Multiple power generation units including multiple power generation sections, A first discharge unit is connected to each of the aforementioned multiple power generation units and discharges the exhaust gas discharged from each of the aforementioned multiple power generation units together, A second discharge unit is connected to each of the multiple first discharge units and discharges the exhaust gas discharged from each of the multiple first discharge units to the outside in a combined manner, It comprises a control unit and, The control unit controls at least one of the plurality of power generation units such that the exhaust gas flow rate discharged from the second discharge unit is equal to or greater than the exhaust gas flow rate when all of the plurality of power generation units have started generating power, after all of the plurality of power generation units have started generating power.

9. The plurality of power generation units include a first power generation unit that stops and a second power generation unit that does not stop. When the plurality of power generation units include a first power generation unit that includes the first power generation section, The power generation system according to claim 8, wherein the control unit controls at least one of the plurality of power generation units so that the exhaust gas flow rate discharged from the first discharge section of each of the plurality of power generation units is the same.

10. The power generation system according to claim 9, wherein the control unit controls at least one of the plurality of power generation units according to the number of first power generation units included in the first power generation unit.

11. The power generation system according to claim 10, wherein the control unit controls the power generation units other than the first power generation unit with the largest number of first power generation units to reduce the exhaust gas flow rate of the power generation units other than the first power generation unit with the largest number of first power generation units to the exhaust gas flow rate of the first power generation unit with the largest number of first power generation units.

12. The power generation system according to claim 10, wherein the control unit controls the power generation units other than the first power generation unit with the fewest number of first power generation units to increase the exhaust gas flow rate of the power generation units other than the first power generation unit with the fewest number of first power generation units to the exhaust gas flow rate of the first power generation unit with the fewest number of first power generation units.

13. The power generation system according to claim 9, wherein the control unit controls the plurality of power generation units such that the current value flowing through the plurality of power generation units when the first power generation unit is stopped is greater than the current value flowing through the plurality of power generation units when all of the plurality of power generation units are generating power.

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