JP2002155761A - Generating method and generating facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a thermal efficiency is reduced at the time of partial loading when a regeneration cycle gas turbine generator is operated at constant speed. SOLUTION: A voltage conversion part 11 for adjusting a turbine entrance temperature by an alternate pressure-raising chopper in order to enhance a thermal efficiency at the time of partial loading is provided and a variation of a frequency is adjusted by a normal conversion part 12 and a reverse conversion part 12C. It is also included that a turbine speed is reduced in order to enhance a thermal efficiency of the gas turbine and the turbine entrance temperature is lowered. A combined generation facility including a fuel cell or the like is also included.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation method and a power generation facility for driving a generator by a gas turbine.
In particular, the present invention relates to a power generation method and equipment with improved thermal efficiency at the time of partial load, and a power generation method and equipment in combination of various gas turbines with other equipment.

[0002]

2. Description of the Related Art In a gas turbine, a gas generator is driven by a turbine by compressing the gas with a compressor, heating the gas with a combustor, and expanding the generated high-temperature and high-pressure gas in the turbine. .

As gas turbines for power generation, 1 / C / E type gas turbines are used for small power generation, and 1 / C / E type gas turbines are used for large power generation.
/ C type or the like is used. When an aircraft engine is used for power generation, 1 / LP, 2SC / CLP,
2SC / LP type and the like are used.

[0004] Among them, the 1 / C / E type gas turbine is
As shown in FIG. 10, one compressor 1 and one turbine 2 are axially connected, and the air compressed by the compressor 1 is preheated by the exhaust from the turbine 2 by the heat exchanger 3, and the air is compressed by the combustor 4. And a regeneration cycle gas turbine for introducing high temperature and high pressure to the turbine 2 by heating. As a result, the recovery of waste heat from the turbine can improve the thermal efficiency by about 10% compared to a simple cycle gas turbine.

[0005] In a power generation facility using a regenerative cycle gas turbine as a prime mover, the generator is driven directly from the turbine or via a speed reducer, and the power output from the generator is supplied to an electric load. In this case, since the generator has a constraint that the frequency of the generated power is constant, the rotation speed of the generator is kept constant irrespective of the fluctuation of the electric load. Driven at a constant speed.

In some power generation facilities using a gas turbine as a prime mover, the gas turbine and the generator are directly connected, and the power generated by the generator is output at a constant frequency by an inverter or the like.
Alternatively, there is a configuration in which generated power of an AC generator is temporarily converted into DC power by a converter or the like, and the converted power is output at a constant frequency by an inverter or the like. In the case of these power generation facilities, it is not necessary to keep the rotation speed of the generator (frequency of the power generation output) as a factor, but to keep the generation voltage (proportional to the rotation speed) constant, the rotation speed of the gas turbine is almost constant. It is constant.

[0007]

(First Problem) As described above, in a power generation facility using a gas turbine as a prime mover, since the gas turbine is operated at a constant speed, a portion where the electric load of the generator decreases. There has been a problem that the thermal efficiency of the gas turbine is greatly reduced during loading.

FIG. 11 shows the load characteristics of the regenerative cycle gas turbine, showing changes in thermal efficiency and turbine inlet temperature with partial load. In the figure, when a generator is used as a load, it is shown as a constant speed characteristic, and when a blower, a pump propeller, etc. is used as a load, it is shown as a propeller characteristic. In the case of a generator load, for example, when the load factor is 40%, the thermal efficiency is reduced by more than 10% compared to when the load is full.

An object of the present invention is to provide a power generation method and equipment capable of increasing the thermal efficiency under a partial load in a power generation method and equipment using a gas turbine as a prime mover.

(Second Problem) In a power generation facility in which a generator is driven by a simple-cycle or regenerative-cycle gas turbine, there is a case where it is combined with other equipment, for example, the combustor 4 is replaced with a fuel cell, a gas furnace, or the like. Also at this time, the generator is operated at a constant speed, but as shown in FIG. 11, the turbine inlet temperature also decreases at the time of partial load. For example, as shown in FIG. 12, in the case of a combined facility using air preheated by the heat exchanger 3 to take in the air electrode into the fuel cell 6, FIG.
As shown in (1), the turbine inlet temperature decreases with the decrease in the thermal efficiency of the gas turbine due to the partial load, the temperature of the air introduced into the fuel cell 6 decreases, and the power generation efficiency of the fuel cell decreases. Further, in a kiln or the like, an arbitrary temperature is required, but a change in turbine inlet temperature makes it difficult to obtain a desired temperature state.

An object of the present invention is to provide a power generation method and equipment in which a simple cycle gas turbine or a regenerative cycle gas turbine is combined with other equipment by adjusting the gas turbine inlet temperature at a partial load to an arbitrary value. An object of the present invention is to provide a power generation method and equipment capable of supplying a temperature required by equipment.

[0012]

Means for Solving the Problems (1) Principle of the Invention (a) When the gas turbine power generation equipment is combined with other equipment such as a kiln, the turbine inlet temperature is set to the temperature required by the other equipment. If the adjustment is made to match, the torque generated by the gas turbine changes, and the generated power changes.

Therefore, in the present invention, in gas turbine power generation combined with other equipment, the mechanical impedance of the generator shaft is adjusted so that the gas temperature required by other equipment can be supplied independently of the generated power. is there.

(B) In the load characteristics of the gas turbine shown in FIG. 11, when the turbine inlet temperature is kept constant at a high temperature as in the case of full load, the thermal efficiency at partial load becomes good. FIG.
In the example, if the turbine inlet temperature is maintained at a high temperature equivalent to that at full load, the thermal efficiency can be reduced by about several percent even at a load factor of 40%. That is, in order to increase the thermal efficiency of the gas turbine, it is effective to improve the thermal efficiency by keeping the inlet temperature of the gas turbine constant regardless of the magnitude of the load. However, if it is attempted to maintain the turbine inlet temperature constant even at a partial load, the turbine speed changes, and the generator speed (frequency) and the generation voltage also change.

Therefore, in the present invention, the mechanical impedance of the generator shaft is adjusted so that the turbine inlet temperature can be constantly adjusted irrespective of the magnitude of the load in order to increase the thermal efficiency at the time of partial load.

(C) In the load characteristics of the gas turbine,
Although the thermal efficiency is slightly lowered, lowering the rotational speed at the time of partial load and lowering the turbine inlet temperature at the same time can reduce the decrease in the thermal efficiency. In the example of FIG. 11, the propeller characteristic is a typical example, but the thermal efficiency decreases gradually up to a load factor of about 40%. In addition, in the case of a power generation facility that makes heavy use of partial load operation, lowering both the turbine inlet temperature and the turbine speed can be expected to extend the machine life.

Therefore, in the present invention, the mechanical impedance of the generator shaft is adjusted so that the rotational speed of the gas turbine is reduced according to the partial load and the turbine inlet temperature is reduced in order to increase the thermal efficiency at the partial load. It is.

(D) Impedance conversion means is used in the present invention to adjust the turbine inlet temperature so that the mechanical impedance of the generator shaft can be adjusted independently of the electrical impedance of the load.

Faraday's law of electromagnetic induction e = dφ / d
According to t, the rotation speed of the generator corresponds to the voltage e, and the torque corresponds to the current i. That is, the rotation speed ω of the turbine
The ratio ω / T of the torque and the torque T is proportional to the ratio e / i of the voltage e to the current i, and means the mechanical impedance of the generator shaft serving as a load on the turbine. On the other hand, the electric load of the generator corresponds to the electrical impedance as viewed from the generator.

Therefore, in the present invention, the mechanical impedance of the generator shaft is adjusted independently of the electrical impedance of the power load for the purpose of adjusting the inlet temperature of the gas turbine.

FIG. 13 shows a basic configuration example of the present invention. An impedance converter 7 is provided between the generator 5 and the electric load L, and the temperature controller 8 performs feedback control of the impedance converter 7 based on the turbine inlet temperature or a temperature command of another device and the detected temperature. The power control unit 9 controls a fuel supply amount to the combustor 4 based on a detected value of a current or power supplied to the electric load L and a power generation output command. When the impedance conversion unit 7 is configured electromagnetically or mechanically, the impedance conversion unit 7 is provided in a portion different from the portion between the generator 5 and the electric load.

As described above, the present invention is characterized by the following power generation method and power generation equipment.

(2) Method Invention (a) A power generation method in which a generator is driven by a gas turbine to obtain a power generation output of a constant frequency and a constant voltage,
In adjusting the turbine inlet temperature when the generator is partially loaded, the mechanical impedance of the generator shaft is adjusted electrically, magnetically, or mechanically.

(B) A power generation method in which a generator is driven by a gas turbine to obtain a power generation output of a constant frequency and a constant voltage, wherein the turbine inlet temperature is kept constant in order to increase the thermal efficiency of the gas turbine when the generator is partially loaded. , The mechanical impedance of the generator shaft is electrically, magnetically or mechanically adjusted.

(C) A power generation method in which a generator is driven by a gas turbine to obtain a power generation output of a constant frequency and a constant voltage, wherein the turbine speed is reduced in order to increase the thermal efficiency of the gas turbine when the generator is partially loaded. In addition, in lowering the turbine inlet temperature, the mechanical impedance of the generator shaft is electrically, magnetically or mechanically adjusted.

(D) The turbine inlet temperature is adjusted to a temperature required by another device connected to the gas turbine.

(3) Apparatus invention (a) A power generation facility which drives a generator by a gas turbine to obtain a power generation output of a constant frequency and a constant voltage,
In adjusting the turbine inlet temperature at the time of partial load of the generator, there is provided an impedance conversion means for electrically, magnetically or mechanically adjusting the mechanical impedance of the generator shaft.

(B) A power generating facility for driving a generator by a gas turbine to obtain a power generation output of a constant frequency and a constant voltage, wherein the turbine inlet temperature is kept constant in order to increase the thermal efficiency of the gas turbine when the generator is partially loaded. In this case, impedance conversion means for electrically, magnetically or mechanically adjusting the mechanical impedance of the generator shaft is provided.

(C) A power generating facility that drives a generator by a gas turbine to obtain a power generation output of a constant frequency and a constant voltage, and reduces the turbine speed in order to increase the thermal efficiency of the gas turbine when the generator is partially loaded. In addition, an impedance conversion means for electrically, magnetically or mechanically adjusting the mechanical impedance of the generator shaft in lowering the turbine inlet temperature is provided.

(D) The turbine inlet temperature is adjusted by adjusting the temperature at a temperature required by another device connected to the gas turbine.

(E) The impedance conversion means changes the mechanical impedance of the generator shaft by controlling the step-up / step-down ratio of the generated voltage by an AC step-up / step-down chopper using the winding inductance of the generator as a reactor. The output frequency is controlled.

(F) The impedance conversion means changes the mechanical impedance of the generator shaft by controlling the buck-boost ratio of the generated voltage by a DC buck-boost chopper, and controls the frequency of the generated output by an inverter. I do.

(G) The impedance conversion means changes the mechanical impedance of the generator shaft by switching the generated voltage stepwise by a voltage doubler rectifier circuit, and controls the frequency of the generated output by an inverter. .

(H) The impedance conversion means changes the mechanical impedance of the generator shaft by switching the generated voltage stepwise by a transformer with a tap, and controls the frequency of the generated output by an inverter. .

(I) The impedance conversion means changes the mechanical impedance of the generator shaft by changing the generated voltage of the generator having the tapped winding stepwise by a tap changeover switch, and the frequency of the generated output by the inverter. Is controlled.

(J) The impedance conversion means changes the mechanical impedance of the generator shaft by continuously controlling the generated voltage by the exciting current adjusting circuit of the generator, and controls the frequency of the generated output by the inverter. It is characterized by.

(K) The impedance conversion means changes the mechanical impedance of the generator shaft by controlling the generated voltage by using the generator as a differential compound wound DC generator, and controls the frequency of the generated output by the inverter. It is characterized by the following.

(L) The impedance conversion means is a generator for adjusting the magnetic flux between the rotor and the stator, and controls the generated voltage to change the mechanical impedance of the generator shaft. It is characterized in that the frequency is controlled.

(M) The impedance conversion means changes the mechanical impedance of the generator shaft by controlling the speed ratio of the transmission provided between the gas turbine and the generator, and controls the frequency of the power generation output. It is characterized by the following.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIG. 1 is a diagram showing an apparatus configuration of an impedance converter of FIG. 13 showing an embodiment of the present invention, and a three-phase AC generator having a regeneration cycle gas turbine as a prime mover. In this case, only the main circuit configuration is shown.

This impedance converter increases the output current of the generator by adjusting the step-up / step-down ratio of the output voltage of the generator, thereby increasing the torque (resistance) of the generator shaft and decreasing the rotation speed of the gas turbine. Increase the turbine inlet temperature by reducing the air flow.

In the present embodiment, the mechanical impedance adjustment for adjusting the turbine inlet temperature at the time of partial load is electrically performed by the voltage conversion unit 11 using the winding inductance of the generator. Further, a change in the generator frequency due to a change in the speed of the gas turbine is adjusted by the frequency conversion unit 12 configured by an inverter or the like.

The voltage converter 11 is configured as an AC boost chopper circuit. For example, for a positive half-wave voltage induced in the R-phase winding of the generator 5, by turning on the semiconductor switch TR, a short-circuit current temporarily flows through the R-phase winding through the diodes D1 and D2, Immediately after that, the semiconductor switch T
By turning off R, a boosted output can be obtained on the R-phase winding. Similarly, for a negative half-wave voltage from the R-phase winding,
When the switch TR is turned on, the diodes D3, D4
By passing a short-circuit current through the switch and turning off the switch TR immediately thereafter, a boosted output can be obtained. The boost ratio at this time can be continuously changed by controlling the firing angle of the switch TR. The boosted output in which the boost ratio is continuously changed can be similarly obtained for the other phases.

The frequency converter 12 rectifies the three-phase current boosted to a desired voltage by a forward converter 12A having a bidirectional three-terminal thyristor bridge structure, and smoothes it by a smoothing capacitor unit 12B. Inverting unit 1 that uses this DC power as a bridge configuration of a bidirectional conducting three-terminal thyristor
The power is converted into AC power adjusted to a constant frequency by 2C and supplied to an electric load or the like (not shown).

According to this embodiment, the mechanical output impedance of the gas turbine and the electrical impedance of the generator are matched by stepwise increasing the power output from the generator 5 to an arbitrary voltage by the voltage converter 11. . The speed change at this time is adjusted to a constant frequency by the frequency conversion unit 12. This makes it possible to continuously adjust the rotation speed of the gas turbine at partial load to increase its thermal efficiency, or to adjust the turbine inlet temperature to the temperature required by other equipment in the combined system, or to reduce the electric load. Power can be supplied at a constant frequency and a constant voltage. Further, the power factor can be improved by controlling the firing angle of the voltage conversion unit 11.

In a case where the power generation voltage of the generator 5 is higher than the rated voltage of the electric load, the voltage conversion unit 11 can be configured to obtain a step-down function instead of the step-up function.

The use of a bidirectional conducting three-terminal thyristor for each of the thyristors of the forward converter 12A and the inverse converter 12C is achieved by obtaining the reverse conversion operation by adjusting the firing phase of each thyristor. Is operated as an electric motor to start the gas turbine. That is, by performing the forward conversion operation of the inverse conversion unit 12C and performing the reverse conversion operation of the forward conversion unit 12A, the generator is generated by the AC power whose frequency and voltage are adjusted from the AC power supplied to the inverse conversion unit 12C to the forward conversion unit 12A. 5 is started to accelerate the gas turbine to an operable speed. Also, when combined with other equipment, operation as a blower is possible.

As described above, the configurations of the voltage conversion unit 11 and the frequency conversion unit 12 are appropriately changed in design according to the configuration of the power generation equipment. For example, when the frequency conversion unit 12 is used to drive the generator 5, the input / output terminals thereof are switched so that a one-way conduction thyristor can be used as a switch element of the frequency conversion unit 12, and the control device Is also easier. Furthermore, each arm is configured in series / parallel connection of a plurality of thyristors to increase the power conversion capacity, and the inverter is configured as a PWM inverter in order to reduce harmonic components of AC supplied to the electric load. The switching element of the frequency converter can be replaced with an IGBT, GTO, or power transistor instead of a thyristor.

(Embodiment 2) In this embodiment, as shown in FIG.
The DC power is smoothed, and the generated voltage is boosted by a voltage converter 14 having a DC boost chopper configuration, and the boosted DC power is converted into AC power whose frequency is adjusted by a frequency converter 15.

The current converter 14 is provided with a semiconductor switch TR1
, A short-circuit current is temporarily supplied to the reactor L1, and then the switch TR1 is turned off to obtain a rectified current boosted from the reactor L1 to the diode D3, thereby obtaining a boosted output to the smoothing capacitor C1.

Also in this embodiment, the mechanical impedance is adjusted by steplessly increasing the power output from the generator 5 to an arbitrary voltage by the voltage converter 14, and the frequency is adjusted to a constant frequency by the frequency converter 15. The electric load can be supplied at a constant frequency and a constant voltage to the electric load by adjusting the rotational speed of the gas turbine steplessly at the time of the partial load to enhance its thermal efficiency.

In the present embodiment, the voltage converter 14 is configured as a booster circuit, but is configured as a step-down circuit when the generator voltage is high. The switches of the respective parts are configured to use one-way conducting thyristors. When the generator 5 is used for starting the gas turbine, means for switching the connection with the generator is provided.

(Embodiment 3) In this embodiment, as shown in FIG. 3, a rectified voltage of a power output from a generator 5 can be switched by a voltage converter 16 having a voltage doubler rectifier circuit. The frequency converter 15 is the same as that in FIG.

The voltage doubling rectifier circuit charges the capacitor C2 during a half-wave period of the voltage generated by the generator 5, and charges the capacitor C2 with a reverse voltage applied to the capacitor C2 in the subsequent half-wave period through the diode D4 to the opposite polarity. As a result, a voltage double is obtained in the capacitor C2, and this is charged through the diode D5 to the smoothing capacitor C1 with the voltage double. Changeover switch SW1
Allows switching in two stages between charging the smoothing capacitor C1 with a voltage through a diode D6 that directly rectifies the output of the generator 5 and charging the smoothing capacitor C1 with a voltage doubled through a diode D5.

According to the present embodiment, it is possible to adjust the mechanical impedance by switching the generated voltage in two stages, and to obtain an output in which the frequency conversion unit 15 has a constant frequency. Thus, the generation voltage is adjusted by switching the voltage conversion unit 16 in order to increase the thermal efficiency by switching the rotation speed of the gas turbine in two stages according to the partial load.

Although this embodiment shows a case of two-stage switching, a triple voltage circuit or the like is additionally provided so that three or more stages of voltage switching can be performed. And the thermal efficiency can be further increased. Although the voltage doubler circuit is shown in FIG. 3 as a half-wave rectifier circuit, a multi-phase and full-wave rectifier circuit configuration can be used to increase power conversion efficiency.

(Embodiment 4) In this embodiment, as shown in FIG. 4, a voltage converter using a tapped transformer between the generator 5 and the rectifier 13 instead of the voltage converter 14 in FIG. This is the unit 17.

The transformer with taps can switch the transformation ratio by the number of taps, switch the generated voltage of the generator 5 to a plurality of stages and supply it to the rectifier 13 to adjust the mechanical impedance, and 15 can obtain an output whose frequency has been adjusted.

Also in the present embodiment, as in the case of FIG. 3, the rotational speed of the gas turbine can be switched to a plurality of stages according to the partial load to increase the thermal efficiency.

In this embodiment, the voltage converter 1
7 may be provided on the output side of the frequency conversion unit 15.
Further, the transformer may be a stepless transformer such as an autotransformer or a slide transformer.

(Embodiment 5) In this embodiment, as shown in FIG. 5, a generator 5 having a tap lead winding is used instead of the voltage converter 11 in FIG. An interlock switch 18 for switching connection with the conversion unit 12A is provided.

Also in this embodiment, as in the case of FIG. 4, the voltage adjustment at that time is controlled by the interlock switch 18 such that the rotational speed of the gas turbine is switched to a plurality of stages according to the partial load to increase the thermal efficiency. Switch

In this embodiment, the generator 5 has a case where a tap is provided on the armature winding, but the tap is provided on the field winding and the armature winding is directly connected to the rectifier 12A. May be.

(Embodiment 6) In this embodiment, as shown in FIG. 6, an exciting current adjusting section 19 for adjusting the exciting current of the generator 5 is provided instead of the voltage converting section 11 in FIG. The generator voltage is adjusted by adjusting the exciting current.

The exciting current adjusting section 19 controls the voltage of the exciting winding steplessly by voltage control by the thyristor-structured forward converting section 19A.

In the present embodiment, the voltage can be adjusted steplessly, and the thermal efficiency of the gas turbine can be maximized as compared with the stepwise voltage adjustment as shown in FIGS.

In this embodiment, the exciting current adjusting section can be constituted by another voltage adjuster.

(Embodiment 7) In this embodiment, as shown in FIG. 7, instead of the AC generator 5 and the voltage converter 16 in FIG. 3, a differential compound-winding DC generator 20 having a drooping characteristic is provided. Things.

According to the present embodiment, since the generator voltage rises due to the decrease in the load current at the time of partial load, the rotation speed of the gas turbine can be reduced accordingly and the thermal efficiency can be increased.

(Embodiment 8) In this embodiment, as shown in FIG. 8, instead of the generator 5 and the voltage converter 17 shown in FIG. 4, a generator 21 capable of inserting and removing a rotor from a stator is provided.

According to the present embodiment, the mechanical impedance can be adjusted by adjusting the amount of insertion / removal of the rotor of the generator 21 to increase or decrease the magnetic flux passing through the rotor and adjust the generated voltage. The thermal efficiency of the gas turbine can be increased by continuous adjustment.

In this embodiment, the case of inserting and removing the rotor is shown. However, it is possible to adopt a configuration in which the stator side is inserted and removed, and a configuration in which the magnetic shielding cylinder is inserted and removed between the rotor and the stator.

(Embodiment 9) In the present embodiment, as shown in FIG. 9, the speed of the gas turbine can be made variable by a mechanical method with respect to the voltage adjustment by the electric method described above. .

In the present embodiment, a multi-stage transmission 22 is provided between the compressor 1 and the generator 5 which is axially connected to the gas turbine 2 so that the speed of the generator 5 is kept constant even when the speed of the gas turbine changes. The gear ratio of the transmission 22 is switched.

In this embodiment, the case of a multi-stage transmission is shown. However, by using a continuously variable transmission, the rotation speed can be changed steplessly, and electric power can be supplied even during a shift operation. Becomes Further, a torque converter or the like can be used as the transmission.

[0076]

As described above, according to the present invention, in order to adjust the turbine inlet temperature with respect to the partial load of the generator, the impedance is electrically, magnetically or mechanically controlled for controlling the turbine speed. Since the means is provided, it is possible to increase the thermal efficiency at the time of partial load and to obtain a power generation output with a stable frequency and voltage.

Further, an electric, magnetic or mechanical conversion mechanism for controlling the turbine speed for lowering the turbine inlet temperature and lowering the turbine inlet temperature with respect to the partial load of the generator is provided. In addition to increasing the thermal efficiency, a power generation output with stable frequency and voltage can be obtained.

Further, since the turbine inlet temperature can be arbitrarily adjusted, it is possible to operate at a temperature required by other combined equipment.

[Brief description of the drawings]

FIG. 1 is an apparatus configuration diagram according to a first embodiment of the present invention.

FIG. 2 is an apparatus configuration diagram according to a second embodiment of the present invention.

FIG. 3 is an apparatus configuration diagram according to a third embodiment of the present invention.

FIG. 4 is an apparatus configuration diagram according to a fourth embodiment of the present invention.

FIG. 5 is an apparatus configuration diagram according to a fifth embodiment of the present invention.

FIG. 6 is an apparatus configuration diagram according to a sixth embodiment of the present invention.

FIG. 7 is an apparatus configuration diagram according to a seventh embodiment of the present invention.

FIG. 8 is an apparatus configuration diagram according to an eighth embodiment of the present invention.

FIG. 9 is an apparatus configuration diagram according to a ninth embodiment of the present invention.

FIG. 10 is a configuration example of a 1 / C / E type gas turbine.

FIG. 11 shows load characteristics of a 1 / C / E type gas turbine.

FIG. 12 shows an example of combined power generation of a fuel cell and a gas turbine.

FIG. 13 is a basic configuration diagram of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Gas turbine 3 ... Heat exchanger 4 ... Combustor 5, 21 ... Generator 6 ... Fuel cell 7 ... Impedance conversion part 8 ... Temperature control part 9 ... Power control part 11, 14, 16, 17 ... Voltage converters 12, 15, frequency converter 13, rectifier 19, excitation current adjuster 20, differential compound-winding DC generator 22, transmission

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02C 9/00 F02C 9/00 Z H02P 9/00 H02P 9/00 A 9/04 9/04 G F term (Reference) 3G071 AB01 BA04 BA10 EA01 FA01 FA02 FA06 HA01 HA02 HA05 JA03 5H590 AA02 CA08 CC01 CD01 CD03 CE01 EB02 EB14 EB17 FA01 FA08 FC11 FC12 FC15 FC17 FC23 HA02 HA09

Claims (17)

[Claims] 1. A generator driven by a gas turbine,
A power generation method for obtaining a power generation output at a constant frequency and a constant voltage, wherein the mechanical impedance of the generator shaft is adjusted electrically, magnetically, or mechanically in adjusting the turbine inlet temperature when the generator is partially loaded. A power generation method characterized by the above-mentioned. 2. A generator is driven by a gas turbine,
A power generation method for obtaining a power generation output of a constant frequency and a constant voltage, wherein the mechanical impedance of the generator shaft is electrically and A power generation method characterized by magnetic or mechanical adjustment. 3. A generator driven by the gas turbine,
A method for generating power at a constant frequency and a constant voltage, wherein the mechanical impedance of the generator shaft is reduced by lowering the turbine speed and lowering the turbine inlet temperature in order to increase the thermal efficiency of the gas turbine when the generator is partially loaded. A power generation method characterized by electric, magnetic, or mechanical adjustment. 4. The power generation method according to claim 1, wherein the turbine inlet temperature is adjusted to a temperature required by another device coupled to the gas turbine. 5. A generator driven by a gas turbine,
A power generation facility that obtains a power generation output of a constant frequency and a constant voltage, and that adjusts the mechanical impedance of the generator shaft electrically, magnetically, or mechanically in adjusting the turbine inlet temperature when the generator is partially loaded. A power generation facility comprising conversion means. 6. A generator driven by a gas turbine,
A power generation facility that obtains a power generation output of a constant frequency and a constant voltage, wherein the mechanical impedance of the generator shaft is electrically and electrically controlled when the turbine inlet temperature is constantly adjusted to increase the thermal efficiency of the gas turbine when the generator is partially loaded. A power generation facility, comprising: impedance conversion means for adjusting magnetically or mechanically. 7. A generator driven by a gas turbine,
A power generation facility that obtains a power output with a constant frequency and a constant voltage.In order to increase the thermal efficiency of the gas turbine when the generator is partially loaded, the mechanical impedance of the generator shaft is reduced by lowering the turbine speed and lowering the turbine inlet temperature. A power generation facility comprising an impedance conversion means for adjusting electric, magnetic or mechanical. 8. The method according to claim 5, wherein the control of the turbine inlet temperature includes means for adjusting to a temperature required by another device coupled to the gas turbine. Power generation equipment. 9. The impedance conversion means changes the mechanical impedance of the generator shaft by controlling the step-up / step-down ratio of the generated voltage by an AC step-up / step-down chopper using the winding inductance of the generator as a reactor. The power generation equipment according to any one of claims 5 to 8, wherein the frequency is controlled. 10. The impedance conversion means changes the mechanical impedance of the generator shaft by controlling the step-up / step-down ratio of the generated voltage by a DC step-up / step-down chopper, and controls the frequency of the generated output by an inverter. A power generation facility according to any one of claims 5 to 8. 11. The method according to claim 1, wherein the impedance conversion means changes the mechanical impedance of the generator shaft by switching the generated voltage stepwise by a voltage doubler rectifier circuit, and controls the frequency of the generated output by an inverter. Item 9. The power generation equipment according to any one of Items 5 to 8. 12. The apparatus according to claim 1, wherein the impedance conversion means changes the mechanical impedance of the generator shaft by switching the generated voltage stepwise by a transformer with a tap, and controls the frequency of the generated output by an inverter. Item 9. The power generation equipment according to any one of Items 5 to 8. 13. The impedance conversion means changes the mechanical impedance of the generator shaft by changing the generated voltage of the generator having a tapped winding stepwise by a tap changeover switch, and changes the frequency of the generated output by an inverter. The power generation equipment according to any one of claims 5 to 8, wherein the power generation equipment is controlled. 14. The impedance conversion means changes the mechanical impedance of the generator shaft by continuously controlling the generated voltage by an excitation current adjusting circuit of the generator,
The power generation equipment according to any one of claims 5 to 8, wherein the frequency of the power generation output is controlled by an inverter. 15. The impedance conversion means changes the mechanical impedance of the generator shaft by controlling the generated voltage by using the generator as a differential compound-winding DC generator, and controlling the frequency of the generated output by an inverter. The power generation facility according to any one of claims 5 to 8, wherein 16. The generator according to claim 1, wherein said impedance converting means is a generator for adjusting magnetic flux between the rotor and the stator, and controls a generated voltage to change a mechanical impedance of the generator shaft. The power generation equipment according to any one of claims 5 to 8, wherein 17. The apparatus according to claim 17, wherein the impedance converting means controls a gear ratio of a transmission provided between the gas turbine and the generator to change a mechanical impedance of a generator shaft and control a frequency of a power generation output. The power generation facility according to any one of claims 5 to 8, wherein