JP2018017196A - Control device of gas turbine generator, control method of gas turbine generator, and gas turbine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve both the electric power generation efficiency and the load follow-up performance.SOLUTION: A control device 4 of a gas turbine generator comprises: a driving mode setting part 403 for setting the driving mode of the gas turbine generator; an allocation electric power calculation part 404 that is adapted to the driving mode set in the driving mode setting part 403 and calculating the output power of the generator following the power generation command value and the output value of the electric motor on the basis of the power generation command value following the load of the electric power system, the output power of each of the generator and the motor at that time, and a model for estimating the internal state of the gas turbine generator; and a control command output part 405 for commanding the generator and the motor to output the calculated output power of the generator and the motor as the power to be generated, respectively.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a control device for a gas turbine power generation device, a control method for the gas turbine power generation device, and a gas turbine power generation device.

  The prediction of power generation output is uncertain, and with the widespread use of renewable energy power generation such as wind power generation and solar power generation with large output fluctuations, there is concern about destabilization of the entire power system. In order to solve this problem, it is necessary to change the output of the conventional thermal power generator according to the output of the renewable energy power generation, and level the total power generation output. Among thermal power generation, gas turbine power generation is expected to be able to level out fluctuations in the output of renewable energy because the startup time is shorter than that of coal thermal power generation and the load change rate can be increased.

  Patent Document 1 discloses an example of a two-shaft gas turbine power generation system as a power generation system with high followability to load fluctuations. The two-shaft gas turbine power generation system includes a high-pressure turbine driven by combustion gas generated in a combustor, a compressor that sends compressed air to the combustor, and a first rotating shaft to which the high-pressure turbine and the compressor are attached. An electric motor attached to the first rotating shaft, a low-pressure turbine driven by the combustion gas driving the high-pressure turbine, a generator driven by the low-pressure turbine, and a low-pressure turbine and a generator attached to the first generator 2 rotation shafts.

  In such a two-shaft gas turbine power generation system, when an output command for adjusting to load fluctuations is received, the generator of the gas turbine main body tries to generate electric power according to the command value. However, when the change in the output command value is fast, the electric power generated by the generator cannot always follow the output command value. Therefore, when the control device of the two-shaft gas turbine power generation system receives the output command, it takes into account the delay time from combustion of the combustion gas to driving the high pressure turbine to driving the low pressure turbine. Calculate the output of the generator that cannot follow. Then, this output amount is commanded as an output to the electric motor attached to the first rotating shaft. In this way, it is possible to follow the load fluctuation by the output obtained by adding the output of the generator and the output of the electric motor.

  Patent Document 2 proposes an example of a gas turbine control system that is not a power generation system but controls a fuel / air ratio to be constant using a real-time estimation model.

International Publication No. WO2015 / 079508 US Patent Application Publication No. 2014/0090392

  In order to level the power of the power system, it is necessary to change the generator output at high speed. In the two-shaft gas turbine power generation system disclosed in Patent Document 1, the output amount that cannot be followed by the generator of the gas turbine body is compensated by the output of the electric motor. As a result, the output of the two-shaft gas turbine power generation system can follow the load in the power system at high speed.

  By the way, if the flow rate of air in the compressor changes due to the operation of the electric motor and the ratio of fuel to air in the combustor exceeds the appropriate range, the combustion temperature becomes high and the output from the gas turbine body can be limited. There is sex.

  On the other hand, power producers who operate electric power systems are concerned about a decline in profits due to a decrease in the efficiency of their thermal power generators as renewable power generation increases. Therefore, it is possible to follow the fluctuation of the renewable energy power generation at high speed, and the development of a power generation system and its control technology in consideration of the efficiency of the generator has become an issue in the near future.

  The present invention has been made in view of the problems of the prior art as described above, and the object thereof is a gas turbine power generator capable of improving power generation efficiency while ensuring high-speed load following performance of power generation. It is providing the control apparatus of this, the control method of a gas turbine power generator, and a gas turbine power generator.

The present invention is driven by a compressor that pressurizes air to generate compressed air, a combustor that mixes and burns the compressed air and fuel, and a combustion gas obtained by the combustor, and a first one. A high-pressure gas turbine that drives the compressor via a rotary shaft of the gas turbine, a low-pressure gas turbine that is driven by combustion gas after driving the high-pressure gas turbine, a second rotary shaft, and the second rotary shaft A generator that is driven by the low-pressure gas turbine through a rotating shaft to generate electric power, an electric motor that assists the rotation of the compressor through the first rotating shaft, and that generates electric power separately from the generator; And a frequency converter that is electrically connected to the electric motor and the generator and performs power transfer and frequency conversion between the electric motor and the electric generator. A control apparatus for turbines power generator,
The operation mode setting unit that receives the operation mode input set by the operation manager via the input device, sets the operation mode of the gas turbine power generation device, the power generation command value that follows the load of the power system, and Based on the output power of each of the generator and the motor and a model for estimating the internal state in the gas turbine power generator, the operation mode set by the operation mode setting unit is met and the power generation command value is set. A distributed power calculating unit that calculates a set of distributed power including a first distributed power that is a new output power of the generator that follows and a second distributed power that is a new output power of the motor; The first distribution power and the second distribution power included in the calculated distribution power set are set as the power to be generated by the generator and the motor, respectively. Characterized in that it and a control command output section that command to.

  According to the present invention, there are provided a control device for a gas turbine power generation device, a control method for the gas turbine power generation device, and a gas turbine power generation device capable of improving power generation efficiency while ensuring high-speed load following performance of power generation. The

The figure which showed typically the example of the structure of the gas turbine electric power generating apparatus which concerns on embodiment of this invention. The figure which showed typically the example of the structure of the electric motor drive system which concerns on embodiment of this invention. The figure which showed typically the example of the structure of the two-shaft type gas turbine which concerns on embodiment of this invention. The figure which showed the example of the function structure of the control apparatus which concerns on embodiment of this invention. The figure which showed the example of the operation mode setting screen displayed on a display apparatus by the operation mode setting part. The figure which showed the example of the processing flow of the distribution power calculation process in the power generation efficiency priority mode performed by the distribution power calculation part. The figure which showed the example of the processing flow of the distribution power calculation process in the load follow-up priority mode performed by the distribution power calculation part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to a common component and the overlapping description is abbreviate | omitted.

  FIG. 1 is a diagram schematically showing an example of the configuration of a gas turbine power generator 1 according to an embodiment of the present invention. As shown in FIG. 1, a gas turbine power generator 1 includes an electric motor drive system 2, a two-shaft gas turbine 3, a control device 4 that controls the electric motor drive system 2 and the two-shaft gas turbine 3, and a two-shaft type And a generator 5 driven by the gas turbine 3.

  Here, the electric power generated by the generator 5 is supplied to the external power system 6 and is also supplied to the electric motor drive system 2. In addition, the electric motor drive system 2 receives supply of electric power from the generator 5, and supplies electric power generated by the electric motor 202 to the electric power system 6 according to instructions from the control device 4 as appropriate. Hereinafter, the electric motor drive system 2, the two-shaft gas turbine 3, and the control device 4 will be described in detail with reference to FIGS. 2 to 5 in addition to FIG.

  FIG. 2 is a diagram schematically showing an example of the configuration of the electric motor drive system 2 according to the embodiment of the present invention. As shown in FIGS. 1 and 2, the electric motor drive system 2 includes a frequency converter 201, an electric motor 202, and an electric motor output control device 203.

  The frequency converter 201 has a function of controlling the output direction of the electric motor 202 attached to the rotating shaft 311 and converting the frequency and voltage of power. As shown in FIG. 2, the frequency converter 201 includes a pair of AC / DC conversion circuits 2010 and 2011, and a DC circuit that is sandwiched between the two AC / DC conversion circuits 2010 and 2011 and includes a DC capacitor 2013 and the like. And 2012. Note that the AC / DC conversion circuits 2010 and 2011 are each configured by an insulated gate bipolar transistor (IGBT), a diode, or the like.

  When the motor output control device 203 receives the motor output command output from the control device 4, the motor output control device 203 acquires the drive frequency of the motor 202 at that time from the frequency converter 201, and sets a new drive frequency of the motor 202 according to a predetermined calculation. calculate. The frequency converter 201 drives the electric motor 202 using this new drive frequency. When the rotation speed of the electric motor 202 becomes slow due to the drive, the electric motor 202 functions as a generator for generating electric power, and when the rotation speed of the electric motor 202 becomes high, the electric motor 202 is driven. Functions as an electric motor that consumes electric power.

  As described above, the electric motor drive system 2 can change the output of the electric motor 202 (however, it is expressed as a positive number when functioning as a generator and is expressed as a negative number when functioning as an electric motor). Therefore, the power supplied from the generator 5 to the power system 6 can be increased or decreased depending on the output of the electric motor 202. The output change of the electric motor 202 can be greatly increased in comparison with the output change of the generator 5 driven by the two-shaft gas turbine 3. Therefore, even if the load of the power system 6 changes abruptly, stable power can be supplied to the power system 6.

  FIG. 3 is a diagram schematically showing an example of the configuration of the two-shaft gas turbine 3 according to the embodiment of the present invention. As shown in FIGS. 1 and 3, the two-shaft gas turbine 3 includes a compressor 301 that compresses air, a combustor 302 that mixes and burns fuel with compressed air, a high-pressure turbine 303, and a low-pressure turbine. 304 and a gas turbine control device 305. At this time, the high pressure turbine 303 obtains power from the combustion gas obtained by burning the fuel in the combustor 302, and the low pressure turbine 304 obtains power from the combustion gas discharged from the high pressure turbine 303.

  The high-pressure turbine 303 and the compressor 301 are both attached to the rotation shaft 311 and rotate with the rotation of the rotation shaft 311. Further, an electric motor 202 is attached to the rotating shaft 311, and the electric motor 202 assists the rotational driving of the rotating shaft 311 based on a command from the electric motor output control device 203, and one of rotational energy of the rotating shaft 311. Part to power. The low-pressure turbine 304 and the generator 5 are attached to a rotation shaft 312 that is different from the rotation shaft 311 and rotate around the rotation shaft 312.

  The gas turbine control device 305 controls the amount of air supplied to the compressor 301 and the amount of fuel supplied to the combustor 302 based on the gas turbine output command output from the control device 4, and outputs the output of the generator 5. Follow the gas turbine output command. The output of the two-shaft gas turbine 3, that is, the output of the generator 5 is used to drive the high-pressure turbine 303 with the combustion gas after the gas turbine controller 305 changes the amount of fuel input to the combustor 302. In addition, there is a time delay until the low-pressure turbine 304 is driven. The gas turbine output command output from the control device 4 is calculated in consideration of this time delay.

  In the control of the two-shaft gas turbine 3, the flow rate, pressure, and temperature are usually balanced at the following three locations. That is, (a) the air flow rate, pressure, temperature from the inlet A of the compressor 301 to its outlet B (or the inlet of the combustor 302), and (b) the inlet C of the high-pressure turbine 303 (or the outlet of the combustor 302). ) To its outlet (or low pressure turbine inlet D), combustion gas flow rate, pressure, temperature, and (c) exhaust gas flow rate, pressure, temperature at outlet E of the low pressure turbine 304.

  Further, in the control of the two-shaft gas turbine 3, the temperature limit in the turbine and the environmental regulation value of the exhaust gas are major control restrictions. The gas turbine control device 305 mainly controls the air flow rate and the amount of fuel at the inlet of the compressor 301 so as to meet these restrictions, and can keep the operating conditions of the two-shaft gas turbine 3 within an appropriate range.

  FIG. 4 is a diagram illustrating an example of a functional configuration of the control device 4 according to the embodiment of the present invention. The control device 4 calculates the electric power that each of the motor drive system 2 and the two-shaft gas turbine 3 should output based on the operation status of the motor drive system 2 and the two-shaft gas turbine 3 and various setting information. The calculation results are output as an electric motor output command and a gas turbine output command.

  As illustrated in FIG. 4, the control device 4 includes functional blocks such as a measurement data acquisition unit 401, an operation state display unit 402, an operation mode setting unit 403, a distributed power calculation unit 404, a control command output unit 405, and an information storage unit 411. It is comprised including. Further, the control device 4 includes a display device 421 such as a liquid crystal display device and an input device 422 such as a keyboard and a mouse.

  Here, the measurement data acquisition unit 401 includes an electric motor output value of the electric motor 202 measured by a measuring instrument (not shown), an output value of the generator 5 (that is, a gas turbine output value), a power generation command value given from the host system, and the like. Is acquired, and the acquired data is stored in the information storage unit 411. The operation state display unit 402 displays on the display device 421 the output value of the electric motor 202, the gas turbine output value, the power generation command value, and the time transition status graph of data related to these accumulated in the information storage unit 411, and the gas The operation manager is notified of the operation status of the turbine generator 1. The operation mode setting unit 403 sets an operation mode in the gas turbine power generator 1. In the present embodiment, as described later, the operation mode includes an efficiency priority mode and a load following priority mode.

  The distributed power calculation unit 404 outputs an output command (motor output command) to the motor drive system 2 and an output command to the two-shaft gas turbine 3 so that the power output from the gas turbine power generator 1 follows the power generation command value. (Gas turbine output command) is calculated. That is, the distributed power calculation unit 404 calculates the distribution of the instructed power generation command value between the output power of the generator 5 and the output power of the electric motor 202 and realizes the distribution. In the present embodiment, a model describing the dynamic characteristics of the two-shaft gas turbine 3 is used to calculate these output commands. This model may be expressed by a mathematical formula or may be described by a computer simulation language or the like.

  The control command output unit 405 outputs the motor output command and the gas turbine output command calculated by the distributed power calculation unit 404 to the motor output control device 203 (see FIG. 2) and the gas turbine control device 305 (see FIG. 3), respectively. To do.

  The control device 4 having the functional configuration as described above can be realized by a general computer including an arithmetic processing device (not shown) and a storage device (semiconductor memory, hard disk device, etc.). In that case, the arithmetic processing unit is stored in the storage device in advance for functional blocks such as the measurement data acquisition unit 401, the operation state display unit 402, the operation mode setting unit 403, the distributed power calculation unit 404, and the control command output unit 405. This is realized by executing a predetermined program. Further, the information storage unit 411 is embodied by a partial storage area of the storage device.

  FIG. 5 is a diagram illustrating an example of an operation mode setting screen 4211 displayed on the display device 421 by the operation mode setting unit 403. In the present embodiment, a power generation efficiency priority mode and a load following priority mode are assumed as operation modes. In the power generation efficiency priority mode, the distributed power calculation unit 404 (see FIG. 4) is configured so that the motor output command and the gas turbine maximize the power generation efficiency even if the followability to the load fluctuation of the power system 6 is somewhat sacrificed. Calculate the output command. Further, in the load follow-up priority mode, the motor output command and the gas turbine output command are calculated so as to maximize the followability to load fluctuations (load response performance) even if power generation efficiency is somewhat sacrificed.

  As shown in FIG. 5, the operation mode setting screen 4211 displays a radio button for selecting an operation mode and a data input box for setting parameters used in each operation mode. Incidentally, in the example of FIG. 5, the power generation efficiency priority mode and the load following priority mode are displayed as the operation modes, and here, the radio button of the power generation efficiency priority mode is selected.

  In the example of FIG. 5, for example, a data input box for setting a minimum power generation efficiency value desired by the operation manager is displayed as a parameter of the power generation efficiency priority mode. Similarly, in the load following priority mode, a data input box for setting the load response performance desired by the operation manager is displayed. However, the display of the data input box for the operation mode not selected with the radio button may be omitted.

  In the present embodiment, the power generation efficiency (efficiency) refers to the power generation output expressed in% when operating under the respective conditions with respect to the power generation output at the rated time. Further, it is assumed that the load response performance is a numerical value (output time change rate) represented by, for example, an electric energy that can change per unit time.

  FIG. 6 is a diagram illustrating an example of a processing flow of the distributed power calculation process in the power generation efficiency priority mode executed by the distributed power calculation unit 404. The distributed power calculator 404 uses the generator 5 and the motor 202 to determine the power to follow the power generation command value that is commanded from a host system such as a monitoring center that monitors the load fluctuation of the power system 6. To calculate in real time whether to generate electricity. Specifically, the distributed power calculation unit 404 outputs an output command value (gas turbine output command) to the generator 5, that is, the twin-shaft gas turbine 3, and the electric motor 202, that is, the electric motor, according to the commanded power generation command value. An output command value (motor output command) to the drive system 2 is calculated. For this calculation, a dynamic characteristic model of the two-shaft gas turbine 3 stored in advance in the information storage unit 411 is used.

  As shown in FIG. 6, the distributed power calculation unit 404 first initializes the model by appropriately setting values for parameters related to specifications such as the rated output of the two-shaft gas turbine 3 and environmental parameters such as ambient temperature. (Step S10). Next, the distributed power calculation unit 404 receives an input of a power generation command value to the gas turbine power generation device 1, further acquires a gas turbine output value and a motor output value at that time, and is necessary for the gas turbine power generation device 1. An output change is calculated (step S11). Note that the gas turbine output value and the motor output value are both measured values measured by a predetermined measuring device.

  Next, the distributed power calculation unit 404 appropriately adjusts the output value of the electric motor 202 within a range that can be adjusted with the assistance of the electric motor 202 with respect to the output change necessary for the gas turbine power generation device 1 calculated in step S11. The amount of change and the amount of change in the output value of the generator 5 are determined. In other words, the distributed power calculation unit 404 distributes power that is composed of power to be output by the generator 5 (hereinafter referred to as first distributed power) and power that is to be output from the motor 202 (hereinafter referred to as second distributed power). A plurality of sets are created (step S12). Here, the range that can be adjusted with the assistance of the electric motor 202 refers to the output limit of the electric motor 202.

  Next, the distributed power calculation unit 404 calculates the amount of change in the internal state of the gas turbine power generator 1 by the assist of the electric motor 202 for each set of distributed power created in step S12 (step S13).

  When the rotation speed of the rotating shaft 311 changes with the assistance of the electric motor 202, the flow rate and pressure in the high-pressure turbine 303 and the low-pressure turbine 304 change, and the internal state of the gas turbine power generator 1 changes. The internal state after the change must be within a range that can be adjusted by the assist of the electric motor 202 in step S12. The internal state includes, for example, the temperature of the high-pressure turbine 303 and the low-pressure turbine 304 and the discharge amount of harmful substances in waste gas. These are constraints for the gas turbine to operate safely and while meeting environmental regulations.

  Therefore, the distributed power calculation unit 404 determines whether or not the internal state of the changed gas turbine power generator 1 that has been changed by the assist of the electric motor 202 satisfies a predetermined constraint condition (step S14). As described above, the predetermined constraint condition refers to the range that can be adjusted by the assist of the electric motor 202 in step S12, the temperature limit value of the high-pressure turbine 303 or the low-pressure turbine 304, the environmental regulation value of exhaust gas, and the like.

  If it is determined in step S14 that the internal state of the gas turbine power generator 1 after the change does not satisfy the predetermined constraint condition (No in step S14), the allocated power calculation unit 404 returns to step S12, Create the distributed power pair again. It should be noted that it is only necessary to re-create a set of distributed power that is a set of distributed power when the constraint condition is not satisfied.

  On the other hand, when the internal state of the gas turbine power generation device 1 after the change satisfies a predetermined constraint condition (Yes in step S14), the distributed power calculation unit 404 determines each of the created distributed power sets. The power generation efficiency is calculated, and a set of distributed power that maximizes the power generation efficiency is selected (step S15). In addition, as power generation efficiency, the value of ratio of the electric power (1st distribution electric power) which the generator 5 should generate | occur | produce with respect to the rated output of the gas turbine power generator 1 can be used, for example. Alternatively, it may be a value obtained by subtracting the first distributed power from the rated output of the gas turbine power generator 1.

  Next, the distribution power calculation unit 404 uses the control command output unit 405 as the gas turbine output command and the motor output command by using the first distribution power and the second distribution power included in the selected set of distribution power as the gas turbine output command and the motor output command. To the gas turbine control device 305 and the motor output control device 203 (step S16).

  Next, the distributed power calculation unit 404 determines whether or not the operation mode has been changed, or whether or not the operation of the gas turbine power generator 1 has been stopped (step S17). As a result of the determination, when the operation mode is not changed and the operation of the gas turbine power generator 1 is not stopped (No in step S17), the allocated power calculation unit 404 returns to step S11, and step The processes after S11 are repeatedly executed. On the other hand, when the operation mode is changed or the operation of the gas turbine power generator 1 is stopped (Yes in step S17), the distributed power calculation unit 404 ends the output distribution calculation process of FIG.

  FIG. 7 is a diagram illustrating an example of a processing flow of output distribution calculation processing in the load following priority mode executed by the distribution power calculation unit 404. In the process flow of the output distribution calculation process shown in FIG. 7, priority is given to the load following response performance over the power generation efficiency.

  As shown in FIG. 7, the distributed power calculation unit 404 first initializes the model by appropriately setting values for parameters related to specifications such as the rated output of the two-shaft gas turbine 3 and environmental parameters such as ambient temperature. (Step S20). Next, the distributed power calculation unit 404 receives an input of a power generation command value to the gas turbine power generation device 1, further acquires a gas turbine output value and a motor output value at that time, and is necessary for the gas turbine power generation device 1. An output change is calculated (step S21). Note that the gas turbine output value and the motor output value are both measured values measured by a predetermined measuring device.

  Next, the distributed power calculation unit 404 appropriately adjusts the output value of the electric motor 202 within a range that can be adjusted with the assistance of the electric motor 202 with respect to the output change necessary for the gas turbine power generation device 1 calculated in step S11. The amount of change and the amount of change in the output value of the generator 5 are determined. That is, the distributed power calculation unit 404 creates a plurality of sets of distributed power composed of power to be output from the generator 5 (first distributed power) and power to be output from the motor 202 (second distributed power). (Step S22).

  Next, the distributed power calculation unit 404 calculates the amount of change in the internal state of the gas turbine power generator 1 by the assist of the electric motor 202 for each set of distributed power created in step S22 (step S23).

  Next, the distributed power calculation unit 404 determines whether or not the internal state of the changed gas turbine power generator 1 that has been changed by the assist of the electric motor 202 satisfies a predetermined constraint condition (step S24). Here, the predetermined constraint condition refers to a range adjustable by the assist of the electric motor 202 in step S22, temperature limit values of the high-pressure turbine 303 and the low-pressure turbine 304, environmental regulation values of the exhaust gas temperature, and the like.

  If it is determined in step S24 that the internal state of the gas turbine power generator 1 after the change does not satisfy the predetermined constraint condition (No in step S24), the allocated power calculation unit 404 returns to step S22, Create the distributed power pair again. It should be noted that it is only necessary to re-create a set of distributed power that is a set of distributed power when the constraint condition is not satisfied.

  On the other hand, when the internal state of the gas turbine power generation device 1 after the change satisfies a predetermined constraint condition (Yes in step S24), the distributed power calculation unit 404 sets each of the created distributed power sets. The load follow-up performance value is calculated, and a set of distributed power that maximizes the load follow-up performance value is selected (step S25). As the load following performance value, for example, the total value of the power to be generated by the generator 5 (first distributed power) and the power to be generated by the generator 5 (second distributed power) and the power generation command value The reciprocal of the difference amount can be used.

  Next, the distribution power calculation unit 404 uses the control command output unit 405 as the gas turbine output command and the motor output command by using the first distribution power and the second distribution power included in the selected set of distribution power as the gas turbine output command and the motor output command. To the gas turbine control device 305 and the motor output control device 203 (step S26).

  Next, the distributed power calculation unit 404 determines whether or not the operation mode has been changed, or whether or not the operation of the gas turbine power generator 1 has been stopped (step S27). As a result of the determination, when the operation mode is not changed and the operation of the gas turbine power generation device 1 is not stopped (No in step S27), the allocated power calculation unit 404 returns to step S11 to perform step. S21 and subsequent processes are repeatedly executed. On the other hand, when the operation mode is changed or the operation of the gas turbine power generator 1 is stopped (Yes in step S27), the distributed power calculation unit 404 ends the output distribution calculation process of FIG.

  The processing flow of the output distribution calculation process in the load follow priority mode shown in FIG. 7 is almost the same as the processing flow of the output distribution calculation process in the efficiency priority mode shown in FIG. Only step S25 is different from step S15 of FIG.

  As described above, according to the embodiment of the present invention, when the control device 4 of the gas turbine power generation device 1 receives a power generation command value corresponding to the load of the power system 6 from a host system or the like, a two-shaft gas turbine prepared in advance is provided. 3 is used to calculate the gas turbine output command and the motor output command following the power generation command value in real time, and output the calculation results to the gas turbine control device 305 and the motor output control device 203. Further, when the power generation efficiency priority mode is set by the operation mode setting unit 403, the power generation efficiency is prioritized over the high-speed follow-up performance to the load of the power system 6 in the calculation of the gas turbine output command and the motor output command. . Therefore, in the gas turbine power generation device 1 according to the embodiment of the present invention, the power generation efficiency can be improved while ensuring the load following performance of the power generation.

  The present invention is not limited to the embodiments and modifications described above, and includes various modifications. For example, the above-described embodiments and modifications have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, a part of the configuration of an embodiment or modification can be replaced with the configuration of another embodiment or modification, and the configuration of another embodiment or modification can be replaced with another embodiment or modification. It is also possible to add the following configuration. In addition, with respect to a part of the configuration of each embodiment or modification, the configuration included in another embodiment or modification may be added, deleted, or replaced.

DESCRIPTION OF SYMBOLS 1 Gas turbine power generator 2 Electric motor drive system 3 Two-shaft gas turbine 4 Control apparatus 5 Generator 6 Electric power system 201 Frequency converter 202 Electric motor 203 Electric motor output control apparatus 301 Compressor 302 Combustor 303 High pressure turbine (high pressure gas turbine)
304 Low pressure turbine (low pressure gas turbine)
305 Gas Turbine Control Unit 311 Rotating shaft (first rotating shaft)
312 Rotation axis (second rotation axis)
401 measurement data acquisition unit 402 operation state display unit 403 operation mode setting unit 404 distributed power calculation unit 405 control command output unit 411 storage unit 421 display device 422 input device 2010, 2011 AC / DC conversion circuit 2012 DC circuit unit 2013 DC capacitor 4211 operation Mode setting screen

Claims (8)

A compressor that compresses air to generate compressed air; a combustor that mixes and compresses the compressed air and fuel; and a first rotating shaft that is driven by the combustion gas obtained by the combustor. A high-pressure gas turbine that drives the compressor via the high-pressure gas turbine, a low-pressure gas turbine that is driven by the combustion gas after driving the high-pressure gas turbine, and a second rotary shaft, An electric generator driven by the low-pressure gas turbine to generate electric power, an electric motor that assists rotation of the compressor via the first rotating shaft and generates electric power separately from the electric generator, the electric motor, and the electric power generation A gas turbine applied to a gas turbine power generation apparatus, comprising: a frequency converter that is electrically connected to a motor and includes a frequency converter that performs power transfer and frequency conversion between the motor and the generator. The control apparatus of the power plant,
An operation mode setting unit that receives an input of an operation mode set by an operation manager via an input device and sets an operation mode of the gas turbine power generation device;
Based on the power generation command value following the load of the power system, the output power of each of the generator and the motor at that time, and the model for estimating the internal state in the gas turbine power generator, the operation mode setting unit A first distribution power that is a new output power of the generator that conforms to the set operation mode and follows the power generation command value, and a second distribution power that is a new output power of the motor are included. A distributed power calculation unit for calculating a set of distributed power consisting of:
A control command output unit that commands the first distributed power and the second distributed power included in the calculated set of distributed power to the generator and the motor as power to be generated respectively;
A control device for a gas turbine power generator, comprising: The allocated power calculator is
Creating a plurality of sets of distributed power composed of the first distributed power and the second distributed power;
Estimating, using the model, the amount of change that the operation of the electric motor by the second distribution power has on at least one state of the gas turbine power generation device for each set of the distribution power,
Determining whether the estimated amount of change satisfies a constraint condition determined by hardware of the gas turbine power generation device;
From the set of distributed power determined to satisfy the constraint condition, one set of the distributed power that matches the operation mode set in the operation mode setting unit is selected.
The first distributed power and the second distributed power obtained by the calculation in the distributed power calculation unit using the first distributed power and the second distributed power included in the selected distributed power set; The control device for a gas turbine power generator according to claim 1. The allocated power calculator is
For the set of distributed power determined not to satisfy the constraint condition, the first distributed power and the second distributed power included in the set of distributed power are recreated. Item 3. A control device for a gas turbine power generator according to Item 2. The operation mode setting unit is
An operation mode setting screen for selecting one of a plurality of operation modes including at least one of a power generation efficiency priority mode that prioritizes power generation efficiency and a load tracking priority mode that prioritizes load following is displayed on the display device. The control device for a gas turbine power generator according to claim 2. The allocated power calculator is
When the power generation efficiency priority mode is set by the operation mode setting unit, the set closest to the power generation rated value of the generator from the set of distributed power determined to satisfy the constraint condition The control device for a gas turbine power generator according to claim 4, wherein the set of the distributed power having the first distributed power is selected. The allocated power calculator is
When the load follow priority mode is set by the operation mode setting unit, the first distributed power and the second power are selected from the set of the distributed power determined to satisfy the constraint condition. 5. The set of the distributed power having the first distributed power and the second distributed power that is the sum of the distributed power and the value closest to the power generation command value is selected. Control device for gas turbine power generator. A compressor that compresses air to generate compressed air; a combustor that mixes and compresses the compressed air and fuel; and a first rotating shaft that is driven by the combustion gas obtained by the combustor. A high-pressure gas turbine that drives the compressor via the high-pressure gas turbine, a low-pressure gas turbine that is driven by the combustion gas after driving the high-pressure gas turbine, and a second rotary shaft, An electric generator driven by the low-pressure gas turbine to generate electric power, an electric motor that assists rotation of the compressor via the first rotating shaft and generates electric power separately from the electric generator, the electric motor, and the electric power generation A frequency converter that is electrically connected to a machine and performs power transfer and frequency conversion between the motor and the generator; and a control device that controls the generator and the motor. Comprising a method for controlling a gas turbine power generation device applied to a gas turbine power generation system,
The controller is
An operation mode setting step for receiving an input of an operation mode set by an operation manager via an input device and setting an operation mode of the gas turbine power generation device;
Based on the power generation command value following the load of the power system, the output power of each of the generator and the motor at that time, and the model for estimating the internal state in the gas turbine power generator, the operation mode setting step A first distribution power that is a new output power of the generator that conforms to the set operation mode and follows the power generation command value, and a second distribution power that is a new output power of the motor are included. A distributed power calculation step for calculating a set of distributed power consisting of:
A control command output step for instructing the generator and the motor as the power to be generated by each of the first distributed power and the second distributed power included in the set of calculated distributed power;
The control method of the gas turbine power generator characterized by performing these. A compressor that compresses air to generate compressed air;
A combustor that mixes and burns the compressed air and fuel;
A high pressure gas turbine driven by the combustion gas obtained in the combustor and driving the compressor via a first rotating shaft;
A low pressure gas turbine driven by combustion gas after driving the high pressure gas turbine;
A generator attached to a second rotating shaft and driven by the low-pressure gas turbine through the second rotating shaft to generate electricity;
An electric motor that assists the rotation of the compressor via the first rotating shaft and generates power separately from the generator;
A frequency converter that is electrically connected to the motor and the generator, and performs power transfer and frequency conversion between the motor and the generator;
A control device for controlling the generator and the electric motor;
A gas turbine power generator comprising:
The controller is
An operation mode setting unit that receives an input of an operation mode set by an operation manager via an input device and sets an operation mode of the gas turbine power generation device;
Based on the power generation command value following the load of the power system, the output power of each of the generator and the motor at that time, and the model for estimating the internal state in the gas turbine power generator, the operation mode setting unit A first distribution power that is a new output power of the generator that conforms to the set operation mode and follows the power generation command value, and a second distribution power that is a new output power of the motor are included. A distributed power calculation unit for calculating a set of distributed power consisting of:
A control command output unit that commands the first distributed power and the second distributed power included in the calculated set of distributed power to the generator and the motor as power to be generated respectively;
A gas turbine power generator characterized by comprising:

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