CN111255575A - Speed regulating system and speed regulating method for high-capacity gas turbine - Google Patents
Speed regulating system and speed regulating method for high-capacity gas turbine Download PDFInfo
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- CN111255575A CN111255575A CN202010174730.9A CN202010174730A CN111255575A CN 111255575 A CN111255575 A CN 111255575A CN 202010174730 A CN202010174730 A CN 202010174730A CN 111255575 A CN111255575 A CN 111255575A
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- 239000012530 fluid Substances 0.000 claims abstract description 8
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
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- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 description 16
- 230000001360 synchronised effect Effects 0.000 description 11
- 238000002485 combustion reaction Methods 0.000 description 5
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/01—Purpose of the control system
- F05D2270/02—Purpose of the control system to control rotational speed (n)
Abstract
The invention discloses a speed regulating system and a speed regulating method for a high-capacity gas turbine, wherein the speed regulating system comprises a power supply system, a motor, a hydraulic coupler, a gear box and the gas turbine, wherein the motor provides power for the hydraulic coupler, the hydraulic coupler drives the gear box, and the gear box drives the gas turbine; the first switch module is connected between a power system and a motor. According to the invention, the frequency converter, the first switch module, the second switch module and the fluid coupling are used in a matched manner to realize accurate speed regulation of the large-capacity gas turbine under any load, so that the problem of inaccurate speed regulation of the large-capacity gas turbine in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of turbine speed regulation, in particular to a speed regulation system and a speed regulation method for a high-capacity gas turbine.
Background
The dragging system of the large-capacity gas turbine comprises a dragging motor, a hydraulic coupler and a gear box, wherein the motor provides power, the output of the hydraulic coupler is adjusted, and the speed of a prototype of the gas turbine is adjusted after the output of the hydraulic coupler passes through the gear box. The high-capacity gas turbine has extremely high requirement on the rotating speed precision, but the rotating speed cannot be accurately controlled under the condition of low rotating speed and low load of the motor by the speed regulation through the hydraulic coupler, and if the driving motor is adopted for speed regulation, a frequency converter with larger capacity is required to be arranged for meeting the full-load operation, so that the economic cost is increased. Meanwhile, when a large-capacity gas turbine is ignited, under an extreme condition, the rotating speed of a rotor of a motor dragged by a gas turbine driving shaft system is possibly higher than that of a rotating magnetic field of a stator of the motor, so that energy is reversely poured into a frequency converter, the voltage of a direct-current bus of a power unit in the frequency converter is increased due to the reverse flow of the energy, and finally overvoltage faults are caused, so that the gas turbine cannot normally operate.
Disclosure of Invention
The invention provides a speed regulating system for a high-capacity gas turbine, which solves the problem that the high-capacity gas turbine cannot accurately regulate the speed.
The invention is realized by the following technical scheme:
a speed regulating system for a large-capacity gas turbine comprises a power supply system, a motor, a hydraulic coupler, a gear box and the gas turbine, wherein the motor provides power for the hydraulic coupler, the hydraulic coupler drives the gear box, and the gear box drives the gas turbine; the first switch module is connected between the power supply system and the motor;
in the technical scheme, the frequency converter, the first switch module and the second switch module are added between the power supply system and the motor, so that the frequency converter, the first switch module, the second switch module and the hydraulic coupler can be matched for use, the accurate speed regulation of the gas turbine is completed, the frequency converter with larger capacity is not required to be used, and the economic cost is saved.
As a further improvement of the invention, when the load of the motor is lower than the threshold load, the switch of the first switch module is turned off, the switch of the second switch module is turned on, the motor is connected with the frequency converter, the opening degree of the guide vane of the hydraulic coupler is set to be a fixed value, and the speed regulation of the gas turbine is realized by controlling the motor through the frequency converter;
when the load of the motor is higher than or equal to the threshold load, the switch of the first switch module is closed, the switch of the second switch module is opened, the motor is directly connected with a power supply system, the guide vane of the hydraulic coupler is closed, and the speed of the gas turbine is regulated by regulating the hydraulic coupler;
in the technical scheme, a threshold value is set for the running load of the motor, when the motor load is lower than the threshold value, the motor is judged to be in a low-load working state, and when the motor load is higher than or equal to the threshold value, the motor is judged to be in a high-load working state; therefore, when the motor is in a low load state, the switch of the first switch module is switched off, the switch of the second switch module is switched on, the motor is connected with the frequency converter, the guide vane of the hydraulic coupler is closed before the hydraulic coupler is filled with oil, the frequency converter drives the motor to operate at the frequency of 10Hz, then the hydraulic coupler is filled with oil, the frequency converter drives the motor to reach any low-load range rotating speed interval, the opening degree of the guide vane of the hydraulic coupler is set to be a fixed value, and the frequency converter sets the rotating speed of the motor in the low-load range rotating speed interval to finish the speed regulation of the gas turbine under the; when the motor is in a high load state, the switch of the first switch module is closed, the switch of the second switch module is opened, the motor is directly connected with a power supply system, the guide vane of the hydraulic coupler is fully closed, the frequency converter drives the motor to a rated rotating speed, the motor is put into power frequency operation, and the speed of the gas turbine is regulated by regulating the hydraulic coupler; through the technical scheme, under the matching use of the frequency converter, the first switch module, the second switch module and the hydraulic coupler, the accurate speed regulation of the gas turbine under the condition of high and low loads of the motor can be completed, and the problems of inaccurate speed regulation and single mode in the prior art are solved.
Further, a speed regulation system for a high capacity gas turbine also includes a control module; the frequency converter, the motor, the hydraulic coupler, the first switch module, the second switch module and the power supply system are all connected with the control module;
in the technical scheme, the control module is connected with the motor and used for judging whether the motor is in a low-load working state or a high-load working state so as to control the frequency converter, the force coupler, the first switch module and the second switch module to carry out related operations in the previous technical scheme; meanwhile, to realize accurate speed regulation of the gas turbine under different loads, the mutual switching between frequency conversion and power frequency of the motor and the grid-connected operation of the motor are required; when the motor is connected to the grid, the phase locking is accurately needed to determine the consistency of the amplitude phase frequency output by a power supply system and a frequency converter, so that the synchronous grid connection switching without impact current can be realized, and the system is prevented from being stopped or even damaged due to the extremely large impact current generated by the failure of the synchronous grid connection; therefore, the controller controls the first switch module and the second switch module by judging whether the amplitude phase frequency output by the power supply system is consistent with the amplitude phase frequency output by the frequency converter or not, so that the whole speed regulating system can carry out mutual switching between frequency conversion and power frequency; meanwhile, when the frequency converter operating frequency is consistent with the power supply system operating frequency, phase deviation possibly exists, so that the controller can perform phase deviation angle-related compensation on the frequency converter operating frequency and the power supply system operating frequency, the frequency phase of the frequency conversion output voltage is consistent with that of the power supply system output voltage, and finally synchronous grid connection and rapid switching of frequency conversion and power frequency are completed. .
Further, the frequency converter comprises a brake control module and a direct current bus of the power unit, and the brake control module is connected in parallel to the direct current bus of the power unit;
in the technical scheme, when the combustion engine is ignited, the combustion engine driving shaft system drags the rotating speed of the motor rotor to be possibly higher than the rotating speed of the rotating magnetic field of the motor stator, so that energy flows back into the frequency converter, the voltage of a power unit direct current bus in the frequency converter is increased, and therefore the brake control module is connected in parallel on the power unit direct current bus to prevent the frequency converter from being damaged by high voltage.
Furthermore, the brake control module comprises a rectifying unit, a filtering unit, a brake unit and an inversion unit, wherein the input end of the rectifying unit is connected with the direct current bus of the power unit, the output end of the rectifying unit is connected with the input end of the filtering unit, the output end of the filtering unit is connected with the input end of the brake unit, the output end of the brake unit is connected with the input end of the inversion unit, and the output end of the inversion unit is connected with the direct current bus of the power unit;
in the technical scheme, when the control module detects that the direct current bus voltage of the power unit in the frequency converter exceeds a preset threshold value, the control module conducts the brake control module in the frequency converter, and the backward energy of the motor is divided and consumed on the brake resistor of the brake unit, so that the automatic purpose is achieved; meanwhile, the brake resistor is a ceramic body resistor, so that parasitic inductance formed after wires, sheets and films of a traditional metal resistor are wound is eliminated, spike voltage is prevented from being excited, and energy required to be braked by each power unit and the resistance value of the brake resistor of each brake unit can be calculated in a targeted manner according to relevant conditions such as actually analyzed and calculated backward flow energy value, power duration, the number of frequency converter power units and the like, so that the effectiveness of a brake function is guaranteed, and the waste of cost is avoided; through the technical scheme, the overvoltage fault of the frequency converter caused by backward flow of energy generated when the large-capacity gas turbine is ignited can be effectively avoided, and the normal operation of the gas turbine is ensured.
Further, the present invention provides a speed regulating method for a large capacity gas turbine, comprising the steps of:
s1: a frequency converter, a first switch module and a second switch module are arranged between a power supply system and a motor;
s2: when the motor is under different loads, the speed of the gas turbine under different motor loads is regulated by controlling the first switch module, the second switch module and the hydraulic coupler and matching with the frequency converter.
Furthermore, a brake control module is arranged in the frequency converter to divide the voltage input into the brake control module.
Further, the step of arranging the brake control module in the frequency converter means that the brake control module is connected in parallel to a direct current bus of a power unit in the frequency conversion control module, and when the voltage on the direct current bus is increased to a preset threshold value, the voltage energy reversely flowed by the motor enters the brake control module to be divided.
Further, in step S1, specifically, the input end of the frequency converter is connected to the power supply system, and the output end of the frequency converter is connected to the motor through the first switch module; the second switch module is connected between the power system and the motor.
Further, step S2 is specifically, when the load of the motor is lower than the threshold load, the switch of the first switch module is turned off, the switch of the second switch module is turned on, so that the motor is connected to the frequency converter, the opening degree of the guide vane of the fluid coupling is set to a fixed value, and the motor is controlled by the frequency converter to realize speed regulation of the gas turbine;
when the load of the motor is higher than or equal to the threshold load, the switch of the first switch module is closed, the switch of the second switch module is disconnected, the motor is directly connected with the power supply system, the guide vane of the hydraulic coupler is closed, and the speed of the gas turbine is regulated by adjusting the hydraulic coupler.
In conclusion, the invention has the advantages that the frequency converter, the first switch module, the second switch module and the hydraulic coupler are matched to realize the accurate speed regulation of the large-capacity gas turbine under any load, meanwhile, the control module can be used for carrying out phase deviation angle correlation compensation on the operation frequency of the frequency converter and the operation frequency of the power supply system, so that the frequency phase of the frequency conversion output voltage is consistent with the frequency phase of the output voltage of the power supply system, the synchronous grid connection and the quick switching of frequency conversion and power frequency are finally completed, and the brake control module is arranged in the frequency converter to avoid the frequency converter overvoltage fault caused by the backward flow of energy generated when the large-capacity gas turbine is ignited; the invention makes up the problems of inaccurate speed regulation of the large-capacity gas turbine and overpressure caused by backward flow of energy generated by ignition of the large-capacity gas turbine in the prior art.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a block diagram of a power unit of the frequency converter of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
as shown in fig. 1, a speed regulating system for a large-capacity gas turbine comprises a power supply system, a motor, a fluid coupler, a gear box and a gas turbine, wherein the motor supplies power to the fluid coupler, the fluid coupler drives the gear box, and the gear box drives the gas turbine, and is characterized by further comprising a frequency converter, a first switch module and a second switch module, wherein the input end of the frequency converter is connected with the power supply system, and the output end of the frequency converter is connected with the motor through the second switch module; the first switch module is connected between the power supply system and the motor;
add converter, first switch module and second switch module between electrical power generating system and motor, can use through the cooperation of converter, first switch module, second switch module and fluid coupling ware, accomplish the accurate speed governing to gas turbine, need not use the converter of bigger capacity again simultaneously, practiced thrift economic cost.
When the load of the motor is lower than the threshold load, the switch of the first switch module is switched off, the switch of the second switch module is switched on, the motor is connected with the frequency converter, the opening degree of a guide vane of the hydraulic coupler is set to be a fixed value, and the speed of the gas turbine is regulated by controlling the motor through the frequency converter;
when the load of the motor is higher than or equal to the threshold load, the switch of the first switch module is closed, the switch of the second switch module is opened, the motor is directly connected with a power supply system, the guide vane of the hydraulic coupler is closed, and the speed of the gas turbine is regulated by regulating the hydraulic coupler;
setting a threshold value for the operation load of the motor, judging that the motor is in a low-load working state when the motor load is lower than the threshold value, and judging that the motor is in a high-load working state when the motor load is higher than or equal to the threshold value; therefore, when the motor is in a low load state, the switch of the first switch module is switched off, the switch of the second switch module is switched on, the motor is connected with the frequency converter, the guide vane of the hydraulic coupler is closed before the hydraulic coupler is filled with oil, the frequency converter drives the motor to operate at the frequency of 10Hz, then the hydraulic coupler is filled with oil, the frequency converter drives the motor to reach any low-load range rotating speed interval, the opening degree of the guide vane of the hydraulic coupler is set to be a fixed value, and the frequency converter sets the rotating speed of the motor in the low-load range rotating speed interval to finish the speed regulation of the gas turbine under the; when the motor is in a high load state, the switch of the first switch module is closed, the switch of the second switch module is opened, the motor is directly connected with a power supply system, the guide vane of the hydraulic coupler is fully closed, the frequency converter drives the motor to a rated rotating speed, the motor is put into power frequency operation, and the speed of the gas turbine is regulated by regulating the hydraulic coupler; through the technical scheme, under the matching use of the frequency converter, the first switch module, the second switch module and the hydraulic coupler, the accurate speed regulation of the gas turbine under the condition of high and low loads of the motor can be completed, and the problems of inaccurate speed regulation and single mode in the prior art are solved.
Preferably, the speed regulating system for the large-capacity gas turbine further comprises a control module; the frequency converter, the motor, the hydraulic coupler, the first switch module, the second switch module and the power supply system are all connected with the control module;
the control module is connected with the motor and used for judging whether the motor is in a low-load working state or a high-load working state so as to control the frequency converter, the force coupler, the first switch module and the second switch module to carry out related operations in the previous technical scheme; meanwhile, to realize accurate speed regulation of the gas turbine under different loads, the mutual switching between frequency conversion and power frequency of the motor and the grid-connected operation of the motor are required; when the motor is connected to the grid, the phase locking is accurately needed to determine the consistency of the amplitude phase frequency output by a power supply system and a frequency converter, so that the synchronous grid connection switching without impact current can be realized, and the system is prevented from being stopped or even damaged due to the extremely large impact current generated by the failure of the synchronous grid connection; therefore, the controller controls the first switch module and the second switch module by judging whether the amplitude phase frequency output by the power supply system is consistent with the amplitude phase frequency output by the frequency converter or not, so that the whole speed regulating system can carry out mutual switching between frequency conversion and power frequency; meanwhile, when the frequency converter operating frequency is consistent with the power supply system operating frequency, phase deviation possibly exists, so that the controller can perform phase deviation angle-related compensation on the frequency converter operating frequency and the power supply system operating frequency, the frequency phase of the frequency conversion output voltage is consistent with that of the power supply system output voltage, and finally synchronous grid connection and rapid switching of frequency conversion and power frequency are completed. .
The frequency converter comprises a brake control module and a direct current bus of the power unit, and the brake control module is connected in parallel to the direct current bus of the power unit;
when the combustion engine is ignited, the combustion engine driving shaft system drags the rotating speed of the motor rotor to be possibly higher than the rotating speed of the rotating magnetic field of the motor stator, so that energy flows back into the frequency converter, the voltage of a power unit direct current bus in the frequency converter is increased, and therefore the frequency converter is prevented from being damaged by high voltage by connecting the brake control module in parallel on the power unit direct current bus.
As shown in fig. 2, the brake control module includes a rectifying unit, a filtering unit, a braking unit and an inverting unit, wherein an input end of the rectifying unit is connected to the dc bus of the power unit, an output end of the rectifying unit is connected to an input end of the filtering unit, an output end of the filtering unit is connected to an input end of the braking unit, an output end of the braking unit is connected to an input end of the inverting unit, and an output end of the inverting unit is connected to the dc bus of the power unit;
when the control module detects that the direct current bus voltage of the power unit in the frequency converter exceeds a preset threshold value, the control module switches on a brake control module in the frequency converter, and the backward flow energy of the motor is divided and consumed on a brake resistor of the brake unit, so that the automatic purpose is achieved; meanwhile, the brake resistor is a ceramic body resistor, so that parasitic inductance formed after wires, sheets and films of a traditional metal resistor are wound is eliminated, spike voltage is prevented from being excited, and energy required to be braked by each power unit and the resistance value of the brake resistor of each brake unit can be calculated in a targeted manner according to relevant conditions such as actually analyzed and calculated backward flow energy value, power duration, the number of frequency converter power units and the like, so that the effectiveness of a brake function is guaranteed, and the waste of cost is avoided; through the technical scheme, the overvoltage fault of the frequency converter caused by backward flow of energy generated when the large-capacity gas turbine is ignited can be effectively avoided, and the normal operation of the gas turbine is ensured.
In conclusion, the invention realizes the accurate speed regulation of the large-capacity gas turbine under any load through the matching of the frequency converter, the first switch module, the second switch module and the hydraulic coupler, and simultaneously, the phase deviation angle correlation compensation can be carried out on the operation frequency of the frequency converter and the operation frequency of the power supply system through the control module, so that the frequency phase of the frequency conversion output voltage is consistent with that of the output voltage of the power supply system, the synchronous grid connection, the quick switching of the frequency conversion and the power frequency are finally completed, and the overvoltage fault of the frequency converter caused by the backward flow of energy generated when the large-capacity gas turbine is ignited is avoided by arranging the brake control module in the frequency converter; the invention makes up the problems of inaccurate speed regulation of the large-capacity gas turbine and overpressure caused by backward flow of energy generated by ignition of the large-capacity gas turbine in the prior art.
The inventor of the application applies the speed regulating system for the large-capacity gas turbine in the embodiment to the 20MW synchronous motor starting speed regulation and motor frequency conversion and power frequency switching frequency converter project dragging system of the 50MW gas turbine complete machine test project dragging system of the east turbine limited company for comparison test; in a comparison test, the speed regulating system for the large-capacity gas turbine in the embodiment adopts a 10KV and 20MW three-phase synchronous motor, the rated rotation speed is 3000rpm, each phase of the frequency converter is formed by connecting 8-level power units in series, and 24 power units are provided in total; in a contrast test, firstly, a motor is operated at a power frequency rated rotating speed, a debugging experiment of the gas turbine from 0 to the rated rotating speed is realized only through a hydraulic coupler, but multiple tests show that the tight hydraulic coupler cannot stably and accurately control the rotating speed when the motor has the rated power of below 30%; then, by adopting the speed regulating system, when the rated power of the motor is below 30%, the speed of the motor is regulated by frequency conversion through the speed regulating system of the invention, and the speed regulation of the gas turbine under low load can be effectively completed by matching with a hydraulic coupler. When the rated power of the motor is above 30%, the synchronous grid connection is realized through related functions such as phase compensation and the like designed by the system, so that the motor is switched between frequency conversion and power frequency without impact, and the accurate speed regulation of the gas turbine under the high-load condition can be realized.
For the energy back-flow phenomenon which can be generated when the combustion engine is ignited, a corresponding brake unit is configured for each power unit. According to the results discussed and calculated by technical experts in the sector related to east China Mobile, the energy power of the backward flow does not exceed 3000kW at most and the duration does not exceed 3 seconds. From this it can be calculated that the energy that needs to be consumed is: 3000kW multiplied by 3 seconds is 9000kJ, the peak braking power of each power unit is 125kW, and the braking energy is 375 kJ; since the working threshold of the DC bus voltage is 1100V, the resistance value of the divider resistor is
Through the calculation and analysis, the peak braking power, the braking energy and the specific resistance value of the divider resistor of each power unit can be obtained, and data parameters can be provided for selecting the divider resistor and the frequency converter.
Example 2:
the invention provides a speed regulating method for a high-capacity gas turbine, which comprises the following steps:
s1: a frequency converter, a first switch module and a second switch module are arranged between a power supply system and a motor;
s2: when the motor is under different loads, the speed of the gas turbine under different motor loads is regulated by controlling the first switch module, the second switch module and the hydraulic coupler and matching with the frequency converter.
Furthermore, a brake control module is arranged in the frequency converter to divide the voltage input into the brake control module.
Further, the step of arranging the brake control module in the frequency converter means that the brake control module is connected in parallel to a direct current bus of a power unit of the frequency converter, and when the voltage on the direct current bus is increased to a preset threshold value, the voltage energy reversely flowed by the motor enters the brake control module to be subjected to voltage division.
Further, in step S1, specifically, the input end of the frequency converter is connected to the power supply system, and the output end of the frequency converter is connected to the motor through the first switch module; the second switch module is connected between the power system and the motor.
Further, step S2 is specifically, when the load of the motor is lower than the threshold load, the switch of the first switch module is turned off, the switch of the second switch module is turned on, so that the motor is connected to the frequency converter, the opening degree of the guide vane of the fluid coupling is set to a fixed value, and the motor is controlled by the frequency converter to realize speed regulation of the gas turbine;
when the load of the motor is higher than or equal to the threshold load, the switch of the first switch module is closed, the switch of the second switch module is disconnected, the motor is directly connected with the power supply system, the guide vane of the hydraulic coupler is closed, and the speed of the gas turbine is regulated by adjusting the hydraulic coupler.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. A speed regulating system for a large-capacity gas turbine comprises a power supply system, a motor, a hydraulic coupler, a gear box and the gas turbine, wherein the motor provides power for the hydraulic coupler, the hydraulic coupler drives the gear box, and the gear box drives the gas turbine; the first switch module is connected between a power system and a motor.
2. The speed control system for the large-capacity gas turbine as claimed in claim 1, wherein when the load of the motor is lower than the threshold load, the switch of the first switch module is opened, the switch of the second switch module is closed, the motor is connected with the frequency converter, and the speed of the gas turbine is controlled by the motor through the frequency converter;
when the load of the motor is higher than or equal to the threshold load, the switch of the first switch module is closed, the switch of the second switch module is opened, the motor is directly connected with a power supply system, and the speed of the gas turbine is regulated by adjusting the hydraulic coupler.
3. The governor system for a large capacity gas turbine according to any one of claims 1 to 2, further comprising a control module; and the frequency converter, the motor, the hydraulic coupler, the first switch module, the second switch module and the power supply system are all connected with the control module.
4. The speed control system for the large-capacity gas turbine engine as claimed in claim 1, wherein the frequency converter comprises a brake control module and a DC bus of the power unit, and the brake control module is connected in parallel with the DC bus of the power unit.
5. The speed regulating system for the large-capacity gas turbine as claimed in claim 4, wherein the brake control module comprises a rectifying unit, a filtering unit, a braking unit and an inverting unit, wherein the input end of the rectifying unit is connected with the DC bus of the power unit, the output end of the rectifying unit is connected with the input end of the filtering unit, the output end of the filtering unit is connected with the input end of the braking unit, the output end of the braking unit is connected with the input end of the inverting unit, and the output end of the inverting unit is connected with the DC bus of the power unit.
6. A method of governing speed for a high capacity gas turbine engine, comprising the steps of:
s1: a frequency converter, a first switch module and a second switch module are arranged between a power supply system and a motor;
s2: when the motor is under different loads, the speed of the gas turbine under different motor loads is regulated by controlling the first switch module, the second switch module and the hydraulic coupler and matching with the frequency converter.
7. The speed regulating method for a large capacity gas turbine according to claim 6, wherein a brake control module is provided in the inverter to divide the voltage inputted to the brake control module.
8. The speed regulating method for the large-capacity gas turbine as claimed in claim 7, wherein the step of arranging the brake control module in the frequency converter is that the brake control module is connected in parallel with a direct current bus of a power unit of the frequency converter, and when the voltage on the direct current bus rises to a preset threshold value, the voltage energy reversely flowed by the motor enters the brake control module to be divided.
9. The speed regulating method for the large-capacity gas turbine as claimed in claim 6, wherein in step S1, the input end of the frequency converter is connected to the power system, and the output end of the frequency converter is connected to the motor through the first switch module; the second switch module is connected between the power system and the motor.
10. The speed regulating method for the large-capacity gas turbine according to any one of claims 6, wherein the step S2 is specifically that when the load of the motor is lower than the threshold load, the switch of the first switch module is opened, the switch of the second switch module is closed, the motor is connected with the frequency converter, the opening degree of the guide vane of the fluid coupling is set to be a fixed value, and the speed regulation of the gas turbine is realized by controlling the motor through the frequency converter;
when the load of the motor is higher than or equal to the threshold load, the switch of the first switch module is closed, the switch of the second switch module is disconnected, the motor is directly connected with the power supply system, the guide vane of the hydraulic coupler is closed, and the speed of the gas turbine is regulated by adjusting the hydraulic coupler.
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