Double-shaft gas turbine power generation equipment, control device and control method thereof
阅读说明:本技术 双轴燃气轮机发电设备、其控制装置及控制方法 (Double-shaft gas turbine power generation equipment, control device and control method thereof ) 是由 高桥一雄 永渕尚之 于 2019-02-22 设计创作,主要内容包括:双轴燃气轮机发电设备的控制装置(100)具备:基本输出运算部(110),其求出与要求输出(Pd)对应的基本输出指令值(Pb);成分分离部(120),其将基本输出指令值(Pb)分离为高频成分(Ph)和低频成分(Pl);开度指令输出部(151),其基于低频成分(Pl),求出燃料调节阀(15)的开度,并将开度指令(FVd)向燃料调节阀(15)输出;基本输送接收电量运算部(130),其基于高频成分(Ph),求出感应电动机与外部系统之间的电力的基本输送接收电量(Ib);以及输送接收电力指令输出部(152),其将表示与基本输送接收电量(Ib)对应的输送接收电量的输送接收电力指令(INVd)向频率转换器(24)输出。(A control device (100) for a two-shaft gas turbine power plant is provided with: a basic output calculation unit (110) that obtains a basic output command value (Pb) corresponding to the requested output (Pd); a component separation unit (120) that separates the basic output command value (Pb) into a high-frequency component (Ph) and a low-frequency component (Pl); an opening command output unit (151) that obtains the opening of the fuel control valve (15) on the basis of the low-frequency component (Pl) and outputs an opening command (FVd) to the fuel control valve (15); a basic transmission/reception power calculation unit (130) that obtains a basic transmission/reception power (Ib) of electric power between the induction motor and an external system, based on the high-frequency component (Ph); and a transmission/reception power command output unit (152) that outputs a transmission/reception power command (INVd) indicating a transmission/reception power amount corresponding to the basic transmission/reception power amount (Ib) to the frequency converter (24).)
1. A control device for a two-shaft gas turbine power plant,
the double-shaft gas turbine power generation facility is provided with:
a compressor having a compressor rotor, which generates compressed air by compressing air by rotation of the compressor rotor;
a combustor that combusts fuel in the compressed air to generate combustion gas;
a fuel regulating valve for regulating the flow rate of the fuel supplied to the burner;
a high-pressure turbine having a high-pressure turbine rotor mechanically coupled to the compressor rotor, the high-pressure turbine rotor being rotated by the combustion gas;
a low-pressure turbine having a low-pressure turbine rotor not coupled to the high-pressure turbine rotor, the low-pressure turbine rotor being rotated by the combustion gas discharged from the high-pressure turbine;
a generator that generates power by rotation of the low-pressure turbine rotor and is electrically connected to an external system through which ac power flows;
an induction motor having a motor rotor mechanically coupled to the compressor rotor, electrically connected to the external system in parallel with the generator, and configured to transmit and receive electric power to and from the external system; and
a frequency converter that is provided between the induction motor and the external system in an electrically connected relationship, controls transmission and reception of electric power between the induction motor and the external system, converts a frequency of electric power from the induction motor to a frequency of the external system when electric power from the induction motor is transmitted to the external system, and converts a frequency of electric power from the external system to a frequency of the induction motor when electric power from the external system is received and supplied to the induction motor,
wherein the content of the first and second substances,
the control device for a two-shaft gas turbine power plant comprises:
a basic output calculation unit that obtains a basic output command value corresponding to a deviation between a requested output from the outside and an actual output that is an actual output to the external system;
a component separation unit that separates the basic output command value into a high-frequency component and a low-frequency component;
an opening command output unit that obtains an opening of the fuel regulating valve based on the low frequency component of the basic output command value and outputs an opening command indicating the opening to the fuel regulating valve;
a basic transmission/reception electric-energy calculation unit that obtains a basic transmission/reception electric energy of electric power between the induction motor and the external system based on the high-frequency component of the basic output command value; and
and a transmission/reception power command output unit that generates a transmission/reception power command indicating a transmission/reception power amount of power between the induction motor and the external system based on the basic transmission/reception power amount, and outputs the transmission/reception power command to the frequency converter.
2. The control device of a two-shaft gas turbine power plant according to claim 1,
the basic transmission/reception power calculation unit includes: a utilization rate calculator that obtains a component utilization rate corresponding to an actual rotation rate of the high-pressure turbine, using a predetermined relationship between the actual rotation rate and the component utilization rate, which is an actual rotation rate of the high-pressure turbine; a high-frequency component-using calculator that obtains a value obtained by multiplying the high-frequency component by the component utilization rate as a high-frequency component-using; and a basic transmission/reception electric quantity outputter that converts the high-frequency component into the basic transmission/reception electric quantity and outputs the converted electric quantity.
3. The control device of a two-shaft gas turbine power plant according to claim 2,
in the predetermined relationship, the component use ratio when the actual rotation speed of the high-pressure turbine is lower than an intermediate rotation speed range including a rated rotation speed of the high-pressure turbine and when the actual rotation speed is higher than the intermediate rotation speed range is smaller than the component use ratio when the actual rotation speed is the rated rotation speed.
4. The control device of the two-shaft gas turbine power plant according to any one of claims 1 to 3,
the component separation section has: a low-pass filter that outputs only the low-frequency component of the basic output instruction value; and a subtractor that outputs a value obtained by subtracting the low frequency component from the basic output command value as the high frequency component.
5. The control device of the two-shaft gas turbine power plant according to any one of claims 1 to 4,
the control device for a two-shaft gas turbine power plant further includes a transmission-limited power-reception-amount calculation unit that obtains a transmission-limited power-reception-amount corresponding to a transmission-reception-power rotation speed ratio that is a ratio of the basic transmission-reception power amount to an actual rotation speed that is an actual rotation speed of the high-pressure turbine,
the limited transmission/reception power amount calculation unit correlates a change in the limited transmission/reception power amount with a change in the transmission/reception power rotation speed ratio, determines, as the limited transmission/reception power amount, a transmission/reception power amount corresponding to the transmission/reception power rotation speed ratio when the transmission/reception power rotation speed ratio is in an intermediate ratio section between a first transmission/reception power rotation speed ratio and a second transmission/reception power rotation speed ratio smaller than the first transmission/reception power rotation speed ratio, and determines, when the transmission/reception power rotation speed ratio is in a large ratio section in which the transmission/reception power rotation speed ratio is larger than the first transmission/reception power rotation speed ratio and in a small ratio section in which the transmission/reception power rotation speed ratio is smaller than the second transmission/reception power rotation ratio, a change amount of the transmission/reception power amount corresponding to the transmission/reception power rotation speed ratio and corresponding to the change in the transmission/reception power rotation speed ratio is smaller than the intermediate ratio section As the limited transmission reception power amount,
the transmission/reception power command output unit generates a transmission/reception power command indicating the limited transmission/reception power amount, and outputs the transmission/reception power command to the frequency converter.
6. A two-shaft gas turbine power plant in which,
the double-shaft gas turbine power generation facility is provided with:
the control device of any one of claims 1 to 5;
the compressor;
the burner;
the fuel regulating valve;
the high pressure turbine;
the low pressure turbine;
the generator;
the induction motor; and
the frequency converter.
7. A method for controlling a two-shaft gas turbine power plant, the two-shaft gas turbine power plant comprising:
a compressor having a compressor rotor, which generates compressed air by compressing air by rotation of the compressor rotor;
a combustor that combusts fuel in the compressed air to generate combustion gas;
a fuel regulating valve for regulating the flow rate of the fuel supplied to the burner;
a high-pressure turbine having a high-pressure turbine rotor mechanically coupled to the compressor rotor, the high-pressure turbine rotor being rotated by the combustion gas;
a low-pressure turbine having a low-pressure turbine rotor not coupled to the high-pressure turbine rotor, the low-pressure turbine rotor being rotated by the combustion gas discharged from the high-pressure turbine;
a generator that generates power by rotation of the low-pressure turbine rotor and is electrically connected to an external system through which ac power flows;
an induction motor having a motor rotor mechanically coupled to the compressor rotor, electrically connected to the external system in parallel with the generator, and configured to transmit and receive electric power to and from the external system; and
a frequency converter that is provided between the induction motor and the external system in an electrically connected relationship, controls transmission and reception of electric power between the induction motor and the external system, converts a frequency of electric power from the induction motor to a frequency of the external system when the electric power from the induction motor is transmitted to the external system, and converts a frequency of electric power from the external system to a frequency of the induction motor when the electric power from the external system is received and supplied to the induction motor,
wherein the content of the first and second substances,
in the control method of the two-shaft gas turbine power plant, execution of:
a basic output calculation step of obtaining a basic output command value corresponding to a deviation between a request output from the outside and an actual output that is an actual output to the external system;
a component assigning step of dividing the basic output command value into a high-frequency component and a low-frequency component;
an opening command output step of obtaining an opening of the fuel regulating valve based on the low frequency component of the basic output command value, and outputting an opening command indicating the opening to the fuel regulating valve;
a basic transmission/reception electric-energy calculation step of obtaining basic transmission/reception electric energy of electric power between the induction motor and the external system based on the high-frequency component of the basic output command value; and
and a transmission/reception power command output step of generating a transmission/reception power command indicating a transmission/reception power amount of power between the induction motor and the external system based on the basic transmission/reception power amount, and outputting the transmission/reception power command to the frequency converter.
8. The control method of a two-shaft gas turbine power plant according to claim 7,
the basic transmission/reception power calculation process includes: a utilization rate calculation step of obtaining a component utilization rate corresponding to an actual rotation speed that is an actual rotation speed of the high-pressure turbine, using a predetermined relationship between the rotation speed of the high-pressure turbine and the component utilization rate; a high-frequency component utilization calculation step of calculating a value obtained by multiplying the high-frequency component by the component utilization rate as a high-frequency component utilization; and a basic transmission/reception power output step of converting the high-frequency component into the basic transmission/reception power and outputting the converted power.
9. The control method of a two-shaft gas turbine power plant according to claim 8,
in the predetermined relationship, the component use ratio when the actual rotation speed of the high-pressure turbine is lower than an intermediate rotation speed range including a rated rotation speed of the high-pressure turbine and when the actual rotation speed is higher than the intermediate rotation speed range is smaller than the component use ratio when the actual rotation speed is the rated rotation speed.
10. The control method of the two-shaft gas turbine power plant according to any one of claims 7 to 9,
the component dispensing step includes: a low-pass step of outputting only the low-frequency component of the basic output command value; and a subtraction step of outputting a difference between the basic output command value and the low frequency component as the high frequency component.
11. The control method of the two-shaft gas turbine power plant according to any one of claims 7 to 10,
in the control method for the two-shaft gas turbine power plant, a limited transmitted/received power calculation step of obtaining a limited transmitted/received power corresponding to a transmitted/received power rotation speed ratio, which is a ratio of the basic transmitted/received power and an actual rotation speed, which is an actual rotation speed of the high-pressure turbine, is further performed,
in the limited transmission/reception power amount calculation step, a change in the limited transmission/reception power amount is correlated with a change in the transmission/reception power rotation speed ratio, a transmission/reception power amount corresponding to the transmission/reception power rotation speed ratio is obtained as the limited transmission/reception power amount in an intermediate ratio section between a first transmission/reception power rotation speed ratio and a second transmission/reception power rotation speed ratio smaller than the first transmission/reception power rotation speed ratio, the transmission/reception power amount corresponding to the transmission/reception power rotation speed ratio is obtained as the limited transmission/reception power amount, and a transmission/reception power amount corresponding to the transmission/reception power rotation speed ratio and smaller than the intermediate ratio section is obtained as the transmission/reception power amount in a large ratio section in which the transmission/reception power rotation speed ratio is larger than the first transmission/reception power rotation speed ratio and in a small ratio section in which the transmission/reception power rotation speed ratio is smaller than the second transmission/reception power rotation speed ratio The above-mentioned limitation is to transmit and receive the electric quantity,
in the transmission/reception power command output step, a transmission/reception power command indicating the limited transmission/reception power amount is generated, and the transmission/reception power command is output to the frequency converter.
Technical Field
The present invention relates to a two-shaft gas turbine power plant including a two-shaft gas turbine and a power generator, and a control device and a control method for the same.
The present application claims priority based on the application's Japanese patent application No. 2018-029633, filed on 22/2/2018, the contents of which are incorporated herein by reference.
Background
As a two-shaft gas turbine power plant, for example, there is one described in patent document 1 below. The two-shaft gas turbine power plant includes a two-shaft gas turbine, a generator, a motor, and a frequency converter.
A twin-shaft gas turbine is provided with: a compressor that compresses air to generate compressed air; a combustor that combusts fuel in compressed air to generate combustion gas; a high-pressure turbine driven by combustion gas; and a low-pressure turbine driven by exhaust gas discharged from the high-pressure turbine. The rotor of the high-pressure turbine and the compressor rotor are mechanically coupled to each other. In addition, the rotor of the low-pressure turbine and the rotor of the generator are mechanically coupled to each other. Wherein the rotor of the high-pressure turbine and the rotor of the low-pressure turbine are not mechanically coupled.
When the required output for the two-shaft gas turbine power plant increases rapidly, the generator output may not follow the rapid increase in the required output even if the flow rate of the fuel supplied to the combustor is increased to increase the output of the generator. Therefore, in the technique described in patent document 1, the electric motor is used as a generator once, and the output from the electric motor is used to compensate for a shortage of the generator output with respect to the required output, using the electric power generated by the electric motor. Further, in the case where the required output for the two-shaft gas turbine power generation facility is drastically reduced, even if the flow rate of the fuel supplied to the combustor is reduced to reduce the output of the generator, the generator output may not be able to follow the drastic reduction in the required output. For this reason, in the technique described in patent document 1, the surplus of the generator output with respect to the required output is supplied to the motor via an external system.
As described above, in the two-shaft gas turbine plant described in patent document 1, the output responsiveness to a sudden change in the required output can be improved.
Prior art documents
Patent document
Patent document 1: japanese patent No. 5953424
Disclosure of Invention
Problems to be solved by the invention
In the twin-shaft gas turbine power plant, it is desired to reduce the life consumption of the plant constituting the twin-shaft gas turbine power plant while ensuring the output responsiveness as described above.
Accordingly, an object of the present invention is to provide a technique capable of reducing life consumption of equipment constituting a two-shaft gas turbine power plant while ensuring output responsiveness when a required output abruptly changes.
Means for solving the problems
A two-shaft gas turbine power plant according to an embodiment of the present invention for achieving the above object includes:
a compressor having a compressor rotor, which generates compressed air by compressing air by rotation of the compressor rotor; a combustor that combusts fuel in the compressed air to generate combustion gas; a fuel regulating valve for regulating the flow rate of the fuel supplied to the burner; a high-pressure turbine having a high-pressure turbine rotor mechanically coupled to the compressor rotor, the high-pressure turbine rotor being rotated by the combustion gas; a low-pressure turbine having a low-pressure turbine rotor not coupled to the high-pressure turbine rotor, the low-pressure turbine rotor being rotated by the combustion gas discharged from the high-pressure turbine; a generator that generates power by rotation of the low-pressure turbine rotor and is electrically connected to an external system through which ac power flows; an induction motor having a motor rotor mechanically coupled to the compressor rotor, electrically connected to the external system in parallel with the generator, and configured to transmit and receive electric power to and from the external system; a frequency converter that is provided between the induction motor and the external system in an electrically connected relationship, controls transmission and reception of electric power between the induction motor and the external system, converts a frequency of electric power from the induction motor to a frequency of the external system when electric power from the induction motor is transmitted to the external system, and converts a frequency of electric power from the external system to a frequency of the induction motor when electric power from the external system is received and supplied to the induction motor; and a control device.
The control device is provided with: a basic output calculation unit that obtains a basic output command value corresponding to a deviation between a requested output from the outside and an actual output that is an actual output to the external system; a component separation unit that separates the basic output command value into a high-frequency component and a low-frequency component; an opening command output unit that obtains an opening of the fuel regulating valve based on the low frequency component of the basic output command value and outputs an opening command indicating the opening to the fuel regulating valve; a basic transmission/reception electric-energy calculation unit that obtains a basic transmission/reception electric energy of electric power between the induction motor and the external system based on the high-frequency component of the basic output command value; and a transmission/reception power command output unit that generates a transmission/reception power command indicating a transmission/reception power amount of power between the induction motor and the external system based on the basic transmission/reception power amount, and outputs the transmission/reception power command to the frequency converter.
In this embodiment, the high-frequency component in the required output, in other words, the rapid change in the required output is dealt with by the induction motor receiving power transmitted to and received from the external system. In this aspect, the low-frequency component of the required output, in other words, the relatively gradual change in the required output, is dealt with by the output from the generator accompanying the driving of the two-shaft gas turbine.
It is assumed that not only a low-frequency component but also a high-frequency component is contained in the output command value that determines the opening degree of the fuel regulating valve. In this case, the fuel regulating valve repeats abrupt opening change in accordance with the output command value of the high-frequency component. This consumes the life of the fuel control valve at this time.
On the other hand, in this aspect, since the output command value for specifying the opening degree of the fuel adjustment valve does not contain a high-frequency component, the fuel adjustment valve does not repeat rapid valve opening degree change. Therefore, in this aspect, the life consumption of the fuel adjustment valve can be reduced. However, in this aspect, the rapid change in the required output cannot be coped with in the opening adjustment of the fuel regulating valve. However, in this aspect, as described above, the rapid change in the required output is dealt with exclusively by the transmission and reception of electric power by the induction motor. In addition, the time from the change in the required output to the change in the amount of electric power transmitted and received to and from the external system by the transmission and reception of electric power by the induction motor is extremely shorter than the time from the change in the required output to the change in the amount of electric power generated by the generator by the change in the fuel flow rate. Therefore, in this aspect, output responsiveness to a sudden change in the required output can be ensured. The frequency converter according to this embodiment repeats a rapid operation for transmitting a rapid change in received power amount, based on a high-frequency component of the output command value. However, since the operation of the frequency converter is an electrical operation, the lifetime of the frequency converter is hardly consumed regardless of whether the operation is rapid or gradual.
Here, in the control device, the basic transmission/reception power calculation unit may include: a utilization rate calculator that obtains a component utilization rate corresponding to an actual rotation rate of the high-pressure turbine, using a predetermined relationship between the actual rotation rate and the component utilization rate, which is an actual rotation rate of the high-pressure turbine; a high-frequency component-using calculator that obtains a value obtained by multiplying the high-frequency component by the component utilization rate as a high-frequency component-using; and a basic transmission/reception electric quantity outputter that converts the high-frequency component into the basic transmission/reception electric quantity and outputs the converted electric quantity.
When the transmission/reception power amount indicated by the transmission/reception power command for the frequency converter changes, the rotation speed of the induction motor changes. Since the motor rotor is mechanically coupled to the compressor rotor, the rotational speed of the compressor changes when the rotational speed of the induction motor changes. As the speed of the compressor changes, the flow of compressed air delivered to the combustor changes.
In this aspect, since the fuel flow rate to be supplied to the combustor is determined based on the low-frequency component in the required output, the fuel flow rate changes only gently even if the control device receives a rapidly changing required output. On the other hand, in this aspect, since the rotation speeds of the induction motor and the compressor are inevitably determined based on the high-frequency component in the required output, when the control device receives the rapidly changing required output, the flow rate of the compressed air to be sent to the combustor rapidly changes. Therefore, in this aspect, when the control device receives a rapidly changing required output, the fuel-air ratio, which is the ratio of the fuel flow rate and the compressed air flow rate supplied to the combustor, may deviate from the target fuel-air ratio.
That is, as in the one embodiment and the present aspect described above, when the opening degree of the fuel adjustment valve is determined based on the low frequency component of the required output and the amount of electric power transmitted and received by the induction motor is determined based on the high frequency component of the required output, the fuel-air ratio may deviate from the target fuel-air ratio and the fuel may not be stably combusted in the combustor.
However, when the rotation speed of the high-pressure turbine is the rated rotation speed, the width of the fuel-air ratio region in which stable combustion is possible is set to be the widest. As the rotation speed of the high-pressure turbine becomes greater than the rated rotation speed, and as the rotation speed of the high-pressure turbine becomes less than the rated rotation speed, the width of the fuel-air ratio region in which combustion can be stabilized becomes gradually narrower. Therefore, if the rotation speed of the high-pressure turbine is assumed to be a rotation speed near the rated rotation speed, there is a high possibility that stable combustion can be achieved even if the fuel-air ratio deviates from the target fuel-air ratio. However, as the rotation speed of the high-pressure turbine becomes greater than the rated rotation speed and as it becomes less than the rated rotation speed, the possibility of being able to stabilize combustion decreases.
Therefore, in the present aspect, when the basic transmission received power calculation unit obtains the basic transmission received power using the high-frequency component of the basic output command value, the basic transmission received power calculation unit changes the utilization rate of the high-frequency component in accordance with the rotation speed of the high-pressure turbine. As a result, in this aspect, it is possible to suppress the deviation of the actual fuel-air ratio from the target fuel-air ratio in the narrow region of the fuel-air ratio in which stable combustion is possible.
In the control device having the utilization rate calculator, in the predetermined relationship, the component utilization rate when the actual rotation speed of the high-pressure turbine is lower than or higher than an intermediate rotation speed range including a rated rotation speed of the high-pressure turbine may be smaller than the component utilization rate when the actual rotation speed is the rated rotation speed.
In the control device according to any one of the above aspects, the component separation unit may include: a low-pass filter that outputs only the low-frequency component of the basic output instruction value; and a subtractor that outputs a value obtained by subtracting the low frequency component from the basic output command value as the high frequency component.
In the control device according to any one of the above aspects, the control device of the two-shaft gas turbine power plant may further include a limited transmitted/received power calculation unit that obtains a limited transmitted/received power corresponding to a transmitted/received power rotation speed ratio that is a ratio of the basic transmitted/received power and an actual rotation speed that is an actual rotation speed of the high-pressure turbine. In this case, the limited transmission/reception power amount calculation unit may correlate a change in the limited transmission/reception power amount with a change in the transmission/reception power rotation speed ratio, determine, as the limited transmission/reception power amount, the transmission/reception power amount corresponding to the transmission/reception power rotation speed ratio in an intermediate ratio section between a first transmission/reception power rotation speed ratio and a second transmission/reception power rotation speed ratio smaller than the first transmission/reception power rotation speed ratio, and determine, as the limited transmission/reception power amount, the transmission/reception power rotation speed ratio in a large ratio section in which the transmission/reception power rotation speed ratio is larger than the first transmission/reception power rotation speed ratio and in a small ratio section in which the transmission/reception power rotation speed ratio is smaller than the second transmission/reception power rotation speed ratio, the transmission/reception power amount calculation unit corresponding to the transmission/reception power rotation speed ratio, And the transmission/reception power amount whose variation amount of the transmission/reception power amount with respect to the variation amount of the transmission/reception power rotation speed ratio is smaller than the intermediate ratio section is set as the limited transmission/reception power amount. In this case, the transmission/reception power command output unit generates a transmission/reception power command indicating the limited transmission/reception power amount, and outputs the transmission/reception power command to the frequency converter.
In this aspect, when the limited transmission/reception power calculation unit determines the limited transmission/reception power, when the transmission/reception power rotation speed ratio is in the large ratio section and the small ratio section, the transmission/reception power with a smaller change in the transmission/reception power with respect to the change in the transmission/reception power rotation speed ratio than in the intermediate ratio section is determined as the limited transmission/reception power. As a result, in this aspect, it is possible to suppress the deviation of the actual fuel-air ratio from the target fuel-air ratio in the narrow region of the fuel-air ratio in which stable combustion is possible.
A control method of a two-shaft gas turbine power plant as one embodiment of the invention for achieving the above object is a control method for the following two-shaft gas turbine power plant.
The double-shaft gas turbine power generation facility is provided with: a compressor having a compressor rotor, which generates compressed air by compressing air by rotation of the compressor rotor; a combustor that combusts fuel in the compressed air to generate combustion gas; a fuel regulating valve for regulating the flow rate of the fuel supplied to the burner; a high-pressure turbine having a high-pressure turbine rotor mechanically coupled to the compressor rotor, the high-pressure turbine rotor being rotated by the combustion gas; a low-pressure turbine having a low-pressure turbine rotor not coupled to the high-pressure turbine rotor, the low-pressure turbine rotor being rotated by the combustion gas discharged from the high-pressure turbine; a generator that generates power by rotation of the low-pressure turbine rotor and is electrically connected to an external system through which ac power flows; an induction motor having a motor rotor mechanically coupled to the compressor rotor, electrically connected to the external system in parallel with the generator, and configured to transmit and receive electric power to and from the external system; and a frequency converter that is provided between the induction motor and the external system in an electrically connected relationship, controls transmission and reception of electric power between the induction motor and the external system, converts a frequency of electric power from the induction motor to a frequency of the external system when the electric power from the induction motor is transmitted to the external system, and converts the frequency of electric power from the external system to the frequency of the induction motor when the electric power from the external system is received and supplied to the induction motor.
In the control method, the following steps are executed: a basic output calculation step of obtaining a basic output command value corresponding to a deviation between a request output from the outside and an actual output that is an actual output to the external system; a component assigning step of dividing the basic output command value into a high-frequency component and a low-frequency component; an opening command output step of obtaining an opening of the fuel regulating valve based on the low frequency component of the basic output command value, and outputting an opening command indicating the opening to the fuel regulating valve; a basic transmission/reception electric-energy calculation step of obtaining basic transmission/reception electric energy of electric power between the induction motor and the external system based on the high-frequency component of the basic output command value; and a transmission/reception power command output step of generating a transmission/reception power command indicating a transmission/reception power amount of power between the induction motor and the external system based on the basic transmission/reception power amount, and outputting the transmission/reception power command to the frequency converter.
Here, in the control method, the basic transmission/reception power calculation step may include: a utilization rate calculation step of obtaining a component utilization rate corresponding to an actual rotation speed that is an actual rotation speed of the high-pressure turbine, using a predetermined relationship between the rotation speed of the high-pressure turbine and the component utilization rate; a high-frequency component utilization calculation step of calculating a value obtained by multiplying the high-frequency component by the component utilization rate as a high-frequency component utilization; and a basic transmission/reception power output step of converting the high-frequency component into the basic transmission/reception power Ib and outputting the basic transmission/reception power Ib.
In the control method including the utilization rate calculation step, in the predetermined relationship, the component utilization rate when the actual rotation speed of the high-pressure turbine is lower than or higher than an intermediate rotation speed range including a rated rotation speed of the high-pressure turbine may be smaller than the component utilization rate when the actual rotation speed is the rated rotation speed.
In any of the above control methods, the component dispensing step may include: a low-pass step of outputting only the low-frequency component of the basic output command value; and a subtraction step of outputting a difference between the basic output command value and the low frequency component as the high frequency component.
In any of the above-described control methods, a limited transmission/reception power calculation step of calculating a limited transmission/reception power corresponding to a transmission/reception power rotation speed ratio that is a ratio of the basic transmission/reception power to an actual rotation speed that is an actual rotation speed of the high-pressure turbine may be further performed, and the limited transmission/reception power calculation step may be performed to correlate a change in the limited transmission/reception power with a change in the transmission/reception power rotation speed ratio and calculate the transmission/reception power corresponding to the transmission/reception power rotation speed ratio as the limited transmission/reception power when the transmission/reception power rotation speed ratio is in an intermediate ratio section between a first transmission/reception power rotation speed ratio that is determined in advance and a second transmission/reception power rotation speed ratio that is smaller than the first transmission/reception power rotation speed ratio, when the transmission/reception power revolution speed ratio is in a large-ratio section in which the transmission/reception power revolution speed ratio is larger than the first transmission/reception power revolution speed ratio and in a small-ratio section in which the transmission/reception power revolution speed ratio is smaller than the second transmission/reception power revolution speed ratio, a transmission/reception power amount corresponding to the transmission/reception power revolution speed ratio and having a change amount of the transmission/reception power amount smaller than the intermediate-ratio section with respect to a change amount of the transmission/reception power revolution speed ratio is obtained as the transmission-restricted reception power amount, and in the transmission/reception power command output step, a transmission/reception power command indicating the transmission-restricted reception power amount is generated and the transmission/reception power command is output to the frequency converter.
Effects of the invention
According to one embodiment of the present invention, it is possible to reduce the life consumption of the device while ensuring the output responsiveness when the required output changes abruptly.
Drawings
Fig. 1 is a system diagram of a two-shaft gas turbine power plant according to an embodiment of the present invention.
Fig. 2 is a functional block diagram of a control device in an embodiment of the present invention.
Fig. 3 is an explanatory diagram for explaining a function F1 in one embodiment of the present invention.
Fig. 4 is a functional block diagram of the component separation unit in the embodiment of the present invention.
Fig. 5 is an explanatory diagram for explaining the function F2 in the embodiment of the present invention.
Fig. 6 is an explanatory diagram for explaining a function F3 in one embodiment of the present invention.
Fig. 7 is an explanatory diagram for explaining the function F4 in the embodiment of the present invention.
Fig. 8 is an explanatory diagram for explaining the function F5 in the embodiment of the present invention.
Fig. 9 is a flowchart showing an operation of the control device in the embodiment of the present invention.
Fig. 10 is an explanatory diagram showing a fuel-air ratio region R in which combustion can be stabilized.
Detailed Description
Hereinafter, an embodiment of a two-shaft gas turbine power plant according to the present invention will be described in detail with reference to the drawings.
As shown in fig. 1, the two-shaft gas turbine power plant of the present embodiment includes a two-
The two-
The
The high-
The
The
The
When the power from the
The
As shown in fig. 2, the
The basic
As shown in fig. 3, the function F1 is a function for converting the rotation speed deviation Δ N into the output correction value Pc. The function F1 is basically a function that positively correlates the change in the output correction value Pc with the change in the rotation speed deviation Δ N. When this function F1 is used, the output correction value Pc is 0 when the rotation speed deviation Δ N is 0. When the rotation speed deviation Δ N is negative, the output correction value Pc is also negative. When the rotation speed deviation Δ N is a positive value, the output correction value Pc is also a positive value. Here, in the intermediate deviation section between the first rotation speed deviation Δ N1 in which the rotation speed deviation Δ N is greater than 0 and the second rotation speed deviation Δ N2 which is less than 0, the output correction value Pc changes linearly with respect to the change in the rotation speed deviation Δ N. On the other hand, in a large deviation interval in which the rotation speed deviation Δ N is larger than the first rotation speed deviation Δ N1, the output correction value Pc maintains the output correction value Pc when the rotation speed deviation Δ N is the first rotation speed deviation Δ N1, regardless of a change in the rotation speed deviation Δ N. In a small deviation range in which the rotation speed deviation Δ N is smaller than the second rotation speed deviation Δ N2, the output correction value Pc maintains the output correction value Pc when the rotation speed deviation Δ N is the second rotation speed deviation Δ N2, regardless of a change in the rotation speed deviation Δ N.
The
The basic transmission/reception
As shown in fig. 5, the function F2 is a function showing the relationship between the actual rotational speed NHr, which is the actual rotational speed of the high-
As shown in fig. 6, the function F3 is a function of converting the high frequency component Phu into the basic transmission/reception power Ib. The function F3 is basically a function that makes the change in the basic transmission/reception power Ib have a negative correlation with respect to the change in the utilization high-frequency component Phu. When the function F3 is used, the basic transmission/reception power Ib is 0 when the high-frequency component Phu is 0. When the high frequency component Phu is negative, the basic transmission/reception power Ib is positive. When the high-frequency component Phu has a positive value, the basic transmission/reception electric energy Ib has a negative value. When the transmitted/received power amount is a positive value, the
The limited conveyance received power
As shown in fig. 7, the function F4 is a function for converting the transmission/reception electric power revolution speed ratio Ib/NHr into the transmission-reception electric power amount Ir limitation. The function F4 is a function that positively correlates the change in the limited conveyance received power amount Ir with the change in the conveyance received power rotational speed ratio Ib/NHr. When the function F4 is used, the feeding-reception electric power Ir is restricted to 0 when the feeding-reception electric power rotational speed ratio Ib/NHr is 0. When the transmission/reception power rotation speed ratio Ib/NHr is negative, the transmission/reception power limiting amount Ir is also negative. When the transmitted/received electric power rotation speed ratio Ib/NHr is a positive value, the transmission-limited received electric power Ir is also a positive value. Here, in the intermediate ratio section between the first delivery/reception electric power rotational speed ratio Ib/NHr1 where the delivery/reception electric power rotational speed ratio Ib/NHr is greater than 0 and the second delivery/reception electric power rotational speed ratio Ib/NHr2 where it is less than 0, the limit delivery reception electric power Ir is linearly changed with respect to the change in the delivery/reception electric power rotational speed ratio Ib/NHr. In addition, when the delivery/reception power revolution speed ratio Ib/NHr is in the large ratio section larger than the first delivery/reception power revolution speed ratio Ib/NHr1 and the small ratio section in which the delivery/reception power revolution speed ratio Ib/NHr is smaller than the second delivery/reception power revolution speed ratio Ib/NHr2, although the delivery-limitation received power amount Ir changes linearly with respect to the change in the delivery/reception power revolution speed ratio Ib/NHr, the change amount of the delivery-limitation received power amount Ir is small with respect to the change amount in the delivery/reception power revolution speed ratio Ib/NHr. That is, in the function F4, the change in the limited conveyance power reception amount Ir is slower than the change in the conveyance power reception rotational speed ratio Ib/NHr in the large ratio section and the small ratio section.
The opening
The transmission/reception power
The IGV
The
The functional configurations of the
Next, the operation of the above-described two-shaft gas turbine power plant will be described.
As shown in fig. 1, a
When a start command is input to the
Specifically, the
As the fuel supply amount increases, the amount of combustion gas generated in the
As a result, the electric power generated by the rotation of the
When the
In the normal operation mode, the
The operation of the
The basic
The
The basic transmission/reception
The limited power transmission/
The transmission/reception power
Upon receiving the transmission/reception power command INVd, the
The opening degree
Upon receiving the opening command FVd, the
The IGV
In the present embodiment, the high frequency component Ph of the basic output command value Pb calculated based on the required output Pd, in other words, the rapid change in the required output Pd, is dealt with by the transmission and reception of electric power to and from the external system 1 by the
It is assumed that the
However, in the present embodiment, since the high frequency component Ph is not included in the output command value for specifying the opening degree of the
As described above, in the present embodiment, the life consumption of the
However, the rotation speed of the
In the present embodiment, since the fuel flow rate to be supplied to the
That is, as in the present embodiment, when the opening degree of the
As shown in fig. 10, when the rotation speed NHr of the high-
As described above, the width of the fuel-air ratio region R in which combustion can be stabilized varies with the variation in the rotation speed NHr of the high-
Therefore, in the present embodiment, when the basic transmission/reception electric
As described above, the transmission/reception electric power rotation speed ratio Ib/NHr is a value obtained by dividing the basic transmission/reception electric power Ib by the rotation speed NHr of the high-
In the present embodiment, when the limited conveyance received
Therefore, in the present embodiment, the opening degree of the
As described above, in the present embodiment, while ensuring the output responsiveness to the rapid change in the required output Pd, the life consumption of the
Industrial applicability
According to one embodiment of the present invention, it is possible to reduce the life consumption of the device while ensuring the output responsiveness when the required output changes abruptly.
Description of reference numerals:
an external system;
a two-shaft gas turbine;
a compressor;
a compressor housing;
a compressor rotor;
an IGV device;
a leaf;
11id.. a driver;
a burner;
a high pressure turbine;
a high pressure turbine housing;
a high pressure turbine rotor;
a low pressure turbine;
a low pressure turbine casing;
a low pressure turbine rotor;
a fuel regulating valve;
a fuel line;
a first rotor;
a second rotor;
a generator;
a generator housing;
a generator rotor;
an induction motor;
a motor housing;
a motor rotor;
a frequency converter;
a primary power path;
32. a transformer;
33. a circuit breaker;
a secondary power path;
a first tachometer;
a second tachometer;
an output meter;
a control device;
a basic output arithmetic section;
output a deviation operator;
a target rotational speed generator;
a rotational speed deviation operator;
a converter;
an adder;
a component separation section;
a low pass filter;
a subtractor;
a basic transmission/reception electric quantity calculation unit;
a utilization rate calculator;
using a high frequency component operator;
a basic transmit receive power follower;
a transmission-limited electric quantity calculation unit;
a transmission/reception power rotation speed ratio arithmetic unit;
a limited transmit receive power follower;
an opening command output unit;
a transmission reception power instruction output unit;
an IGV command output unit;
air;
fuel;
a fuel-air ratio;
a first axis;
a second axis;
the rotational speed of the high-pressure turbine (actual rotational speed);
rotational speed of the low pressure turbine (actual rotational speed);
target rotational speed of the low pressure turbine;
a rotational speed deviation;
pd.. request output;
pr.. actual output;
pc.. outputting a correction value;
output deviation;
pb.. basic output command values;
ph.. high frequency components of the basic output command values;
utilize high frequency components;
pl.. low frequency components of the basic output command values;
ib.. basic transmit receive power;
ib/nhr.. deliver a received power speed ratio;
ir.. limiting the amount of power delivered and received;
an igvd.. IGV instruction;
transmitting a receive power command;
an opening instruction;
a fuel-air ratio region in which combustion can be stabilized.
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