JP2016092856A - Gas turbine power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas turbine power generator which allows for reduction of the impact on generators other than the failed one, even if at least one generator fails, out of a plurality of generators operating synchronously, while resuming power supply to the load quickly.SOLUTION: A gas turbine power generator includes a plurality of gas turbines (11, 12), a plurality of generators (21, 22), and a power generator controller (90). When a determination is made that at least one generator satisfies predetermined conditions, based on the rotational speeds of the generators (21, 22) detected by rotational speed sensors (31, 32), the power generator controller (90) controls all generator circuit breakers (41, 42) to open state, and controls the generator circuit breakers (41, 42) connected with a sound machine to closed state, when a determination is made that the rotational speeds of the generators (21, 22) satisfies predetermined reset conditions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas turbine power generator.

  Conventionally, as a gas turbine power generation device, there is one provided with a plurality of gas turbine power generation facilities (Japanese Patent Laid-Open No. 2009-275624 (Patent Document 1)). In this gas turbine power generation device, a plurality of gas turbine power generation facilities are connected in parallel and operated synchronously to supply power to a load.

JP 2009-275624 A

  By the way, when a plurality of gas turbine power generation facilities are operated synchronously, a failure of one gas turbine power generation facility among these gas turbine power generation facilities, for example, out of fuel or fuel of a gas turbine engine of the gas turbine power generation facility A combustion stoppage may occur due to a fuel supply failure due to a system equipment failure or a combustor failure.

  As shown in FIG. 9, the gas turbine engine generally includes a compressor 501, a combustor 502, and a turbine 503. Pressurized air pressurized by the compressor 501 is supplied from the compressor 501 to the combustor 502. The air flowing into the combustor 502 is mixed with fuel, and this mixture is burned. Hot combustion gas is supplied from the combustor 502 to the turbine 503, and the turbine 503 is driven. The compressor 501 naturally takes a large amount of combustion air from the outside by rotation and compresses it to a high pressure, so that a very large driving torque is required. Since the compressor 501 is driven by the power generated in the turbine 503, the output obtained by subtracting the driving torque of the compressor 501 from the output generated in the turbine 503 is the output taken out of the gas turbine engine.

  For this reason, when the combustion stop caused by the failure of the combustor 502 or the like occurs in one of the plurality of gas turbine power generation facilities in the synchronous operation and the output generated in the turbine 503 disappears, the failed gas turbine power generation The driving torque of the compressor 501 of the facility becomes the braking torque of the gas turbine power generation facility that performs another synchronous operation. This braking torque is a so-called motoring load.

  While the rotational speed of the faulty machine in which the combustion stop has occurred is reduced, the rotational speed of the healthy machine is also reduced by the motoring load. Thus, when one of a plurality of gas turbine power generation facilities that are operating synchronously stops burning, the other gas turbine power generation facilities are also affected by the gas turbine power generation facilities that have stopped combustion. There is.

  Further, if each of the stopped gas turbine power generation facilities is to be activated again, it takes a lot of time for confirmation of the cause of failure, recovery work, and the like. For this reason, there exists a problem that the state which cannot supply electric power to a load from a gas turbine power generator continues for a long time of about 10 minutes or more.

  Therefore, the problem of the present invention is that even if at least one generator out of a plurality of generators performing synchronous operation fails, the influence on generators other than the failed generator can be reduced, An object of the present invention is to provide a gas turbine power generator capable of quickly restarting the supply of electric power to a load.

In order to solve the above problems, the gas turbine power generator of the present invention is
A plurality of gas turbines;
A plurality of generators respectively driven by the plurality of gas turbines and connected in parallel to each other;
A plurality of generator breakers respectively connected to the plurality of generators;
A rotational speed detector for detecting the rotational speed of each of the plurality of generators;
If it is determined that the rotational speed of at least one of the generators satisfies a predetermined condition based on the rotational speeds of the plurality of generators detected by the rotational speed detection unit, the plurality of generators are shut off. When all of the generators are controlled to be open and when it is determined that the rotational speed of the generator is a healthy machine that satisfies a predetermined return condition, the generator breaker connected to the healthy machine is controlled to be closed. And a control unit.

  According to the gas turbine power generator having the above-described configuration, the control unit determines in advance the rotation speed of at least one of the generators based on the rotation speeds of the plurality of generators detected by the rotation speed detection unit. When it is determined that the predetermined condition is satisfied, all the plurality of generator breakers are controlled to be in an open state. At this time, the plurality of generators are all in a no-load state. For this reason, for example, even if at least one generator has failed, it is possible to prevent other healthy generators from being stopped due to the influence of the motoring load of the failed device. Also, a healthy generator can quickly return to its original rated operating state.

  Moreover, if the said control part judges that the rotational speed of the said generator is a healthy machine which satisfy | fills the predetermined return condition, it will control the said generator breaker connected to the said healthy machine to a closed state. For this reason, the said healthy machine and the load by the side of the output of a gas turbine power generator can be connected automatically.

  Therefore, it is not necessary to restart the healthy machine again, and it is not necessary to check the cause of failure or perform recovery work. Therefore, even if at least one generator fails, the influence on other generators can be reduced. The supply of power to the load can be resumed promptly.

The gas turbine power generator of the present invention is
A plurality of gas turbines;
A plurality of generators respectively driven by the plurality of gas turbines and connected in parallel to each other;
A plurality of generator breakers respectively connected to the plurality of generators;
A voltage detection unit for detecting a voltage of each of the plurality of generators;
If it is determined that the voltage of at least one of the generators satisfies a predetermined condition based on the voltages of the plurality of generators detected by the voltage detector, all the plurality of generator breakers are A controller that controls the generator breaker connected to the healthy machine to a closed state when it is determined to be a healthy machine that controls the open state and the voltage of the generator satisfies a predetermined return condition. It is characterized by providing.

  According to the gas turbine power generator having the above configuration, the control unit is configured such that the voltage of at least one generator is determined in advance based on the voltages of the plurality of generators detected by the voltage detection unit. If it is determined that the condition is satisfied, all the plurality of generator breakers are controlled to be opened. At this time, the plurality of generators are all in a no-load state. For this reason, for example, even if at least one generator is overvoltage, it is possible to prevent other healthy generators from being stopped due to the influence of the faulty machine. In addition, a healthy generator can quickly return to the original rated operation state in the above-described no-load state.

  Moreover, if the said control part judges that the voltage of a generator is a healthy machine which satisfy | fills the said reset condition, it will control the said generator breaker connected to the said healthy machine to a closed state. For this reason, the healthy machine and the load are automatically connected.

  Therefore, it is not necessary to restart the healthy machine again, and it is not necessary to check the cause of failure or perform recovery work. Therefore, even if at least one generator fails, the influence on other generators can be reduced. The supply of power to the load can be resumed promptly.

  In addition, since it is determined whether or not at least one generator is the above-mentioned faulty machine based on the respective voltages of the plurality of generators, an accurate judgment is made especially when a fault due to an overvoltage of the generator occurs. Can do.

In one embodiment,
If it is determined that the state in which the field current of the at least one automatic voltage regulator connected to each of the plurality of generators is equal to or less than the field current lowering determination value is a failure device that continues for a certain period of time, it is connected to the failure device. A faulty machine stop control unit that controls the generator breaker thus opened to an open state and controls the gas turbine of the faulty machine to stop.

  According to the above embodiment, in at least one generator, even when the excitation power supply of the automatic voltage regulator is cut off due to disconnection or the like and the generator function is lost, the generator breaker of the failed generator is opened. In all generators, abnormal fluctuations such as generator frequency, voltage, load, etc. do not occur due to the influence of the faulty machine.

  In other words, even if at least one generator out of a plurality of generators that are operating synchronously fails due to an excitation power interruption, the effect on generators other than the failed generator is reduced. In addition, the supply of power to the load can be resumed promptly.

  ADVANTAGE OF THE INVENTION According to this invention, even if a generator fails, while being able to reduce the influence on generators other than a failed generator, supply of the electric power to a load can be restarted rapidly.

It is a mimetic diagram showing a schematic structure of a 1st embodiment of a gas turbine power generator of the present invention. It is a figure explaining the state before starting the said gas turbine power generator. It is a figure explaining a state when the said gas turbine electric power generating apparatus starts. It is a flowchart which shows the flow of operation | movement of the said gas turbine power generation device when the 1st gas turbine power generation equipment of the said gas turbine power generation device stops combustion. It is a figure explaining the state of the said gas turbine power generator when the 1st gas turbine power generation equipment of the said gas turbine power generator stops combustion. It is a figure explaining the state of the said gas turbine power generation device when gas turbine power generation equipment other than the said 1st gas turbine power generation equipment is continuing driving | operation. It is a figure explaining a state when the said gas turbine electric power generating apparatus starts re-power supply to load. It is a schematic diagram which shows schematic structure of 2nd Embodiment of the gas turbine electric power generating apparatus of this invention. It is a flowchart which shows the flow of operation | movement of the said gas turbine power generation device when AVR detection is cut off by the 1st gas turbine power generation equipment of the said gas turbine power generation device. It is a schematic diagram which shows schematic structure of 3rd Embodiment of the gas turbine electric power generating apparatus of this invention. It is a flowchart which shows the flow of operation | movement of the said gas turbine power generator when the excitation power supply is cut off by the 1st gas turbine power generation equipment of the said gas turbine power generator. It is a schematic sectional drawing explaining the structure of a gas turbine engine.

  Hereinafter, the gas turbine power generator of the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 shows a first embodiment of a gas turbine power generator of the present invention. As shown in FIG. 1, the gas turbine power generator according to the first embodiment includes two gas turbines 11, 12, two generators 21, 22, two rotational speed sensors 31, 32, 1, a second generator breaker 41, 42, one feeder breaker 43, and a generator control device 90 are provided.

  The two generators 21 and 22 are driven by the two gas turbines 11 and 12, respectively, and are connected to each other in parallel. Here, the gas turbine 11 and the generator 21 constitute a first gas turbine power generation facility 51. In addition, the gas turbine 12 and the generator 22 constitute a second gas turbine power generation facility 52.

  The first generator breaker 41 is provided in the output line 61 of the generator 21. The second generator breaker 42 is provided in the output line 62 of the generator 22. The output lines 61 and 62 are each connected to the power system 60. The electric power system 60 is connected to the load via the feeder circuit breaker 43.

  The rotational speed sensor 31 is attached to the gas turbine 11, and the rotational speed sensor 32 is attached to the gas turbine 12. The rotational speed sensors 31 and 32 detect the rotational speeds of the gas turbines 11 and 12, respectively, and indirectly detect the rotational speeds of the generators 21 and 22 connected to the gas turbines 11 and 12. . The rotational speed sensors 31 and 32 are configured to send a signal representing the rotational speed of the generators 21 and 22 to the power generator control device 90.

  Two rotational speed sensors 31, 32, first and second generator breakers 41, 42, and a feeder breaker 43 are connected to the power generator control device 90. The power generation device control device 90 is based on signals representing the rotation speeds of the generators 21 and 22 from the two rotation speed sensors 31 and 32, and the first and second generator circuit breakers 41 under predetermined conditions. , 42 and the feeder circuit breaker 43 are controlled.

  FIG. 2A is a diagram illustrating a state before the gas turbine power generator is activated.

  As shown in FIG. 2A, the first and second gas turbine power generation facilities 51 and 52 are stopped during normal times, that is, when the commercial power source (not shown) has not failed. The first and second generator breakers 41 and 42 and the feeder breaker 43 are all open.

  FIG. 2B is a diagram illustrating a state after the gas turbine power generator is started.

  As shown in FIG. 2B, when an emergency occurs, that is, when a commercial power source (not shown) fails, the gas turbine power generator is started. At this time, the first and second gas turbine power generation facilities 51 and 52 are operating. The first and second generator breakers 41 and 42 and the feeder breaker 43 are all closed. The electric power generated by the first and second gas turbine power generation facilities 51 and 52 is supplied to the load via the first and second generator breakers 41 and 42 and the feeder breaker 43.

  Next, the operation of the gas turbine power generation device when the first gas turbine power generation facility 51 of the gas turbine power generation device configured as described above stops burning will be described with reference to FIG.

  FIG. 3 is a flowchart showing an operation flow of the gas turbine power generator.

  As shown in FIG. 3, first, in step S <b> 1, combustion is stopped in the first gas turbine power generation facility 51 among the first and second gas turbine power generation facilities 51 and 52 performing the synchronous operation.

  Next, proceeding to step S <b> 2, a motoring load is applied to the second gas turbine power generation facility 52 due to the combustion stop of the first gas turbine power generation facility 51.

  Next, it progresses to step S3, and the rotational speed of the failure machine (first gas turbine power generation equipment 51) is decreased, and the sound machine (second gas turbine power generation equipment 52) is generated by the generation of the motoring. Becomes overloaded, and the rotational speed decreases. Next, it progresses to step S4 and it is judged whether the rotational speed of any gas turbine power generation equipment is 95% or less of a rated rotational speed, ie, whether a circuit breaker should be opened. If it is determined that the breaker should be opened, it is confirmed in step S5 that the first and second generator breakers 41 and 42 are closed, and then the process proceeds to step S6.

  In step S6, all the circuit breakers are opened. Specifically, the first and second generator circuit breakers 41 and 42 and the feeder circuit breaker 43 are controlled to be opened, and the process proceeds to step S7.

  As a result, when it is determined that the rotational speed of any of the gas turbine power generation facilities is 95% or less of the rated rotational speed, the first and second generator breakers 41 and 42 and the feeder breaker 43 are all at the same timing. It can be opened.

  At this time, the healthy machine can be returned to the rated rotational speed because the motoring load caused by the failed machine is removed and the machine becomes unloaded.

  In step S7, it is determined whether or not the rotational speed of the gas turbine power generation facility is within a range of ± 2.0% of the rated rotational speed for 3 seconds or more, that is, whether or not a return condition is satisfied. If it is determined that the rotational speed of the gas turbine power generation facility has recovered, the process proceeds to step S8. If it is determined that the rotational speed of the gas turbine power generation facility has not recovered, the process proceeds to step S11.

  In step S8, the generator breaker and feeder breaker 43 of the healthy machine are turned on again, and the process proceeds to step S9. In step S9, power is resupplied from the gas turbine power generator to the load.

  On the other hand, for the gas turbine power generation facility whose rotational speed has not recovered, it is determined in step S11 whether or not the rotational speed of the gas turbine power generation facility is an abnormal decrease in rotational speed that is 90% or less of the rated rotational speed. If the rotational speed of the gas turbine power generation facility is determined to be an abnormal decrease in the rotational speed, the gas turbine power generation facility is determined to be a failure generator and is stopped due to a serious failure, and the process proceeds to step S12. In step S12, the fuel of the gas turbine power generation facility is shut off.

  FIG. 4A is a diagram illustrating the state of the gas turbine power generation device at the moment when the first gas turbine power generation facility 51 of the gas turbine power generation device stops burning (that is, the moment when the step S1 occurs).

  As shown in FIG. 4A, the second gas turbine power generation facility 52 is healthy and operating. The first and second generator breakers 41 and 42 and the feeder breaker 43 are all closed.

  FIG. 4B is a diagram illustrating a state of the gas turbine power generation device until the rotation speed of the healthy machine is restored (that is, steps S2 to S7).

  As shown in FIG. 4B, the second gas turbine power generation facility 52 continues to operate. The first and second generator breakers 41 and 42 and the feeder breaker 43 are all open.

  FIG. 4C shows a state where the rotational speed of the second gas turbine power generation facility 52 is within a range of ± 2.0% of the rated rotational speed for 3 seconds or longer and satisfies the above return condition, that is, the second generator is shut off. It is a figure explaining the state when the unit 42 and the feeder circuit breaker 43 are turned on again and the gas turbine power generator starts refeeding the load (that is, steps S9 to S10).

  As shown in FIG. 4C, the second gas turbine power generation facility 52 is operating. Moreover, the 2nd generator circuit breaker 42 and the feeder circuit breaker 43 are a closed state.

  According to the gas turbine power generator configured as described above, the power generator control device 90 has the rotational speed of at least one generator based on the rotational speeds of the generators 21 and 22 detected by the rotational speed sensors 31 and 32. When the rotational speed is reduced and it is determined that the rotational speed is 95% or less of the rated rotational speed, the first and second generator breakers 41 and 42 and the feeder breaker 43 are all controlled to be opened. At this time, the generators 21 and 22 are all in a no-load state. For this reason, for example, even if at least one generator has failed, it is possible to prevent other healthy generators from being stopped due to the influence of the motoring load of the failed device. Also, a healthy generator can quickly return to its original rated operating state.

  Further, when the generator control device 90 determines that the rotation speed of the generator is a healthy machine that satisfies the return condition, it controls the generator breaker connected to the healthy machine to be closed. For this reason, the said healthy machine and load can be connected automatically.

  Therefore, it is not necessary to restart the healthy machine again, and it is not necessary to check the cause of failure or perform recovery work. Therefore, even if at least one generator fails, the influence on other generators can be reduced. The supply of power to the load can be resumed promptly.

(Second Embodiment)
When a plurality of gas turbine power generation facilities are operated synchronously, a disconnection may occur in the generator of one gas turbine power generation facility among these gas turbine power generation facilities, resulting in an overvoltage state. Along with the overvoltage state of the generator, the generators of other gas turbine power generation facilities that are operating synchronously are also in the overvoltage state. In this way, when one of the plurality of gas turbine power generation facilities that are operating synchronously is in an overvoltage state, the effects of the generators in which the other gas turbine power generation facilities are also in an overvoltage state are affected. There is a problem of stopping after receiving.

  Therefore, even if at least one of the plurality of generators that are operating synchronously becomes an overvoltage state and fails, the influence on the generators other than the failed generator can be reduced, It is also an object of the present invention to provide a gas turbine power generation facility that can quickly resume the supply of power to the load. A second embodiment of the gas turbine power generator of the present invention that solves this problem will be described below.

  FIG. 5 shows a second embodiment of the gas turbine power generator of the present invention. The difference from the first embodiment will be described. As shown in FIG. 5, in the second embodiment, the gas turbine power generator further includes first and second AVRs (automatic voltage regulators). 101, 102, voltage detection circuits on the secondary side of first and second VT (measurement transformers) 71, 72, and secondary sides of first, second CT (current transformers) 73, 74 Current detection circuit and first and second excitation power supplies 81 and 82. Since other structures are the same as those of the first embodiment, description thereof is omitted.

  The first voltage detection circuit detects the voltage of the generator 21 from the output line 61 and sends a signal representing this voltage to the first AVR 101 and the power generation device controller 90. The second voltage detection circuit detects the voltage of the generator 22 from the output line 62 and sends a signal representing this voltage to the second AVR 102 and the power generation device controller 90.

  The first excitation power supply 81 is connected to the output line 61 and the first AVR 101 and serves as the excitation power supply for the first AVR 101. The second excitation power source 82 is connected to the output line 62 and the second AVR 102 and serves as the excitation power source for the second AVR 102.

  The first AVR 101 is connected to a first voltage detection circuit, a first current detection circuit, and a first excitation power supply 81. The first AVR 101 has a wiring 63 for flowing a field current for adjusting the voltage of the generator 21. The first AVR 101 receives a signal representing the voltage of the generator 21 from the first voltage detection circuit, and adjusts the field current for the generator 21 based on the detected voltage of the generator 21. The voltage of the generator 21 is adjusted.

  The second AVR 102 is connected to a second voltage detection circuit, a second current detection circuit, and a second excitation power supply 82. The second AVR 102 has a wiring 64 for flowing a field current for adjusting the voltage of the generator 22. The second AVR 102 receives a signal representing the voltage of the generator 22 from the second voltage detection circuit, and adjusts the field current for the generator 22 based on the detected voltage of the generator 22. The voltage of the generator 22 is adjusted.

  The power generator control device 90 is connected to first and second voltage detection circuits, first and second generator breakers 41 and 42, and a feeder breaker 43. The power generator control device 90 includes first and second generator circuit breakers under predetermined voltage conditions based on signals representing the voltages of the generators 21 and 22 from the first and second voltage detection circuits. 41 and 42 and the open / close state of the feeder circuit breaker 43 are controlled.

  When the power generation device control device 90 determines that the voltage condition is satisfied, the power generation device control device 90 opens the first and second generator breakers 41 and 42 and the feeder circuit breaker 43 and controls them to the open state. In addition, when determining that the charging condition is satisfied, the power generator control device 90 inputs the first and second generator circuit breakers 41 and 42 and the feeder circuit breaker 43 and controls them to the closed state.

  Next, in the first gas turbine power generation facility 51 of the gas turbine power generation device having the above configuration, for example, when a disconnection occurs in the wiring between the first AVR 101 and the first voltage detection circuit (voltage detection disconnection). The operation of the gas turbine power generator will be described.

  FIG. 6 is a flowchart showing an operation flow of the gas turbine power generator.

  As shown in FIG. 6, first, in step S <b> 101, of the first and second gas turbine power generation facilities 51 and 52 that are operating synchronously, an overvoltage is generated in the generator 21 of the first gas turbine power generation facility 51. Occur. This overvoltage is caused by an increase in the field current from the first AVR 101 to the generator 21 when the first AVR 101 determines that the set voltage of the generator 21 is lowered due to the voltage detection interruption. .

  Next, the process proceeds to step S <b> 102, and overvoltage is generated in the second gas turbine power generation facility 52 due to the overvoltage of the first gas turbine power generation facility 51.

  Next, it progresses to step S103 and it is judged whether the state where the voltage of any generator becomes more than an overvoltage determination value continues for 1 second, ie, whether a circuit breaker should be opened. If it is determined that the breaker should be opened, it is confirmed in step S105 that the first and second generator breakers 41 and 42 are closed, and the process proceeds to step S104.

  In step S104, all the circuit breakers are opened, and specifically, the first and second generator breakers 41 and 42 and the feeder circuit breaker 43 are controlled to be in an open state.

  The flow of operation of the gas turbine power generator when the overvoltage can be resolved by returning to the rated voltage in steps S106 to S109 will be described.

  In step S106, when the voltage of the generator of the gas turbine power generation facility is not more than the overvoltage determination value, the process proceeds to step S107.

  In step S107, it is determined whether or not the state where the voltage of the generator of the gas turbine power generation facility is not more than the overvoltage determination value continues for 3 seconds or more, that is, whether or not the return condition is satisfied. If it is determined that the generator voltage satisfies the return condition, the process proceeds to step S108. In step S108, the generator breaker and feeder breaker 43 of the healthy machine are turned on again, and the process proceeds to step S109. In step S109, the gas turbine power generator repowers the load. The sound machine is controlled based on these steps S101 to S109.

  On the other hand, the flow of operation of the gas turbine power generator when overvoltage continues in steps S110 to S112 will be described.

  When the overvoltage of the gas turbine power generation facility continues in step S110, the process proceeds to step S111.

  In step S111, it is determined whether or not the state in which the generator voltage of the gas turbine power generation facility is equal to or higher than the overvoltage determination value continues for 1 second. If it is determined that the state in which the generator voltage of the gas turbine power generation facility is equal to or higher than the overvoltage determination value has continued for 1 second, the process proceeds to step S112. In step S112, the malfunctioning machine stops due to a serious malfunction. The malfunctioning machine is controlled based on these steps S101 to S104 and steps S110 to S112.

  According to the gas turbine power generator having the above-described configuration, the power generator control device 90 is configured such that the voltage of at least one generator is based on the voltages of the generators 21 and 22 detected by the first and second voltage detection circuits. If it is determined that the state where the voltage becomes equal to or higher than the overvoltage determination value continues for 1 second, all the first and second generator breakers 41 and 42 are controlled to be in the open state. At this time, the generators 21 and 22 are all in a no-load state. For this reason, for example, even if at least one generator is overvoltage, it is possible to prevent other healthy generators from being stopped due to the influence of the faulty machine. In addition, a healthy generator can quickly return to the original rated operation state in the above-described no-load state.

  Further, when the power generator control device 90 determines that the voltage of the generator is a healthy machine that satisfies the return condition, it controls the generator breaker connected to the healthy machine to be closed. For this reason, the healthy machine and the load are automatically connected.

  Therefore, it is not necessary to restart the healthy machine again, and it is not necessary to check the cause of failure or perform recovery work. Therefore, even if at least one generator fails, the influence on other generators can be reduced. The supply of power to the load can be resumed promptly.

  Further, since it is determined whether or not at least one generator is the above-mentioned faulty machine based on the respective voltages of the generators 21 and 22, it is possible to make an accurate judgment particularly when a fault due to an overvoltage of the generator occurs. Can do.

(Third embodiment)
When a plurality of gas turbine power generation facilities are operating synchronously, in the generator of one gas turbine power generation facility among these gas turbine power generation facilities, when the excitation power supply is interrupted, etc. The load fluctuation (power swing) occurs in all the generators including the generator of the gas turbine power generation facility in the generator, and the generator current, the generator voltage, and the generator frequency fluctuate abnormally. There's a problem.

  Therefore, even if at least one generator out of a plurality of generators that are operating synchronously fails due to the excitation power interruption, the effect on generators other than the failed generator is reduced. It is also an object of the present invention to provide a gas turbine power generation facility capable of quickly restarting the supply of power to the load. A third embodiment of the gas turbine power generator of the present invention that solves this problem will be described below.

  FIG. 7 shows a third embodiment of the gas turbine power generator of the present invention. The difference from the second embodiment will be described. As shown in FIG. 7, in the third embodiment, the gas turbine power generator further includes first and second field current detection circuits 83, 84. Since other structures are the same as those of the second embodiment, description thereof is omitted.

  The first field current detection circuit 83 detects a field current flowing through the wiring 63 of the first AVR 101. The first field current detection circuit 83 sends a signal representing the detected field current to the power generator control device 90. The second field current detection circuit 84 detects a field current flowing through the wiring 64 of the second AVR 102. The second field current detection unit 84 sends a signal representing the detected field current to the power generation device control device 90.

  Next, in the first gas turbine power generation facility 51 of the gas turbine power generation apparatus having the above configuration, for example, when a disconnection occurs in the wiring between the first AVR 101 and the first excitation power supply 81 (excitation power supply disconnection). The operation of the gas turbine power generator will be described.

  FIG. 8 is a flowchart showing the operation flow of the gas turbine power generator.

  As shown in FIG. 8, first, in step S201, it is determined whether or not the state in which the field current of the first AVR 101 is equal to or less than the field current decrease determination value continues for 3 seconds. Here, the field current decrease determination value is, for example, 30% of the field current value during no-load operation. Further, the reason for setting it to 3 seconds is that the state where the field current becomes 0 A may continue for 2 seconds when the voltage detection is cut off, so that this state is not erroneously detected. If it is determined that the state in which the field current is equal to or less than the field current decrease determination value has continued for 3 seconds, the process proceeds to step S202. In step S202, it is determined that the field current of the first AVR 101 is abnormal, and the process proceeds to step S203. In step S203, the first gas turbine power generation equipment 151 stops due to a serious failure.

  In addition, this invention is not limited to the said 1st-3rd embodiment, The content described in the said 1st-3rd embodiment may be combined suitably.

  In the first embodiment, when the power generator control device 90 determines that the rotation speed of at least one generator is 95% or less of the rated rotation speed, the first and second generator circuit breakers 41 are provided. , 42 and the feeder circuit breaker 43 are all controlled to be in the open state, but is not limited thereto. For example, even when the rotation speed of at least one generator is 90% or less, 94% or less, or 96% or less of the rated rotation speed, all generator breakers and feeder circuit breakers are controlled to be opened. Good.

  In the first embodiment, the power generator control device 90 determines that the rotational speed of at least one generator is within a range of ± 2.0% of the rated rotational speed for 3 seconds or more. However, it is not limited to this. For example, the return condition may be within 3 seconds or more within the range of ± 5.0% of the rated speed or 5 seconds or more within the range of ± 2.0% of the rated speed. Good.

11, 12 Gas turbine 21, 22 Generator 31, 32 Rotational speed sensor 41, 42 Generator breaker 71 First VT
72 Second VT
90 Power generator control device

Claims (3)

A plurality of gas turbines;
A plurality of generators respectively driven by the plurality of gas turbines and connected in parallel to each other;
A plurality of generator breakers respectively connected to the plurality of generators;
A rotational speed detector for detecting the rotational speed of each of the plurality of generators;
If it is determined that the rotational speed of at least one of the generators satisfies a predetermined condition based on the rotational speeds of the plurality of generators detected by the rotational speed detection unit, the plurality of generators are shut off. When all of the generators are controlled to be open and when it is determined that the rotational speed of the generator is a healthy machine that satisfies a predetermined return condition, the generator breaker connected to the healthy machine is controlled to be closed. A gas turbine power generator comprising a control unit. A plurality of gas turbines;
A plurality of generators respectively driven by the plurality of gas turbines and connected in parallel to each other;
A plurality of generator breakers respectively connected to the plurality of generators;
A voltage detection unit for detecting a voltage of each of the plurality of generators;
If it is determined that the voltage of at least one of the generators satisfies a predetermined condition based on the voltages of the plurality of generators detected by the voltage detector, all the plurality of generator breakers are A controller that controls the generator breaker connected to the healthy machine to a closed state when it is determined to be a healthy machine that controls the open state and the voltage of the generator satisfies a predetermined return condition. A gas turbine power generator comprising: In the gas turbine power generator according to claim 1 or 2,
If it is determined that the state in which the field current of the at least one automatic voltage regulator connected to each of the plurality of generators is equal to or less than the field current lowering determination value is a failure device that continues for a certain period of time, it is connected to the failure device. A gas turbine power generator comprising: a faulty machine stop control unit that controls the generator breaker that has been opened to be in an open state and controls the gas turbine of the faulty machine to stop.

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