CN115013165A - Direct current starting system of gas turbine - Google Patents
Direct current starting system of gas turbine Download PDFInfo
- Publication number
- CN115013165A CN115013165A CN202210607247.4A CN202210607247A CN115013165A CN 115013165 A CN115013165 A CN 115013165A CN 202210607247 A CN202210607247 A CN 202210607247A CN 115013165 A CN115013165 A CN 115013165A
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- Prior art keywords
- gas turbine
- rotating speed
- current starting
- gear box
- direct current
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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
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/26—Starting; Ignition
- F02C7/268—Starting drives for the rotor, acting directly on the rotor of the gas turbine to be started
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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
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/26—Starting; Ignition
- F02C7/264—Ignition
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a direct-current starting system of a gas turbine, when the gas turbine needs to be started, a starting power switch is controlled to be switched on, and a direct-current starting motor is electrified to work to drive a main gear of a gear box, the gas turbine and a main generator to rotate; after the rotating speed of the main gear in the gear box rises to the ignition rotating speed of the gas turbine, the gas turbine ignites, the direct-current starting motor and the gas turbine do work simultaneously, and the rotating speed of the main gear in the gear box is pushed to continue rising; when the rotating speed of the main gear in the gear box is higher than the rated rotating speed of the direct-current starting motor, the overspeed tripping device acts to separate the direct-current starting motor from the mechanical connection with the gear box, and the direct-current starting of the gas turbine is finished. According to the direct-current starting system of the gas turbine, the storage battery pack is used as a starting power source for driving the direct-current starting motor, and the gas turbine does not need to be externally connected with a mains supply alternating-current power supply when being started, so that the use scene of the gas turbine is expanded, the starting reliability of the gas turbine is improved, and the starting preparation time of the gas turbine is shortened.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to a direct-current starting system of a gas turbine.
Background
The gas turbine is known as the pearl on the modern industrial crown, and is widely applied to the fields of ship power, industrial drive, power generation and the like. The gas turbine startup process requires an externally supplied energy source. At present, most of gas turbine units are located at fixed positions of plants, distributed energy stations and the like, and when the gas turbine units are started, commercial power is used for directly driving motors or hydraulic stations and the like to serve as power sources.
When the gas turbine unit needs to be used in a scene without commercial power supply, such as a mobile emergency power supply and emergency drainage equipment, a power supply needs to be connected temporarily, or a small diesel generator unit is used as starting power, so that the use of the gas turbine is greatly limited, the use reliability of the gas turbine unit is reduced, and the starting preparation time is long.
Disclosure of Invention
The invention aims to solve the technical problem of providing a direct-current starting system of a gas turbine, which does not need to be externally connected with a mains supply alternating-current power supply when the gas turbine is started, expands the use scene of the gas turbine, improves the starting reliability of the gas turbine and shortens the starting preparation time of the gas turbine.
In order to solve the technical problem, the direct-current starting system of the gas turbine provided by the invention comprises a starting power switch Q3, a direct-current starting motor 6, the gas turbine 7, a gear box 8, a main generator 9 and a storage battery pack 11;
the positive end of the storage battery pack 11 is connected to the bus bar 10, and the negative end is grounded;
the power supply access positive end of the direct current starting motor 6 is connected with the bus 10 through a starting power switch Q3, and the output shaft of the direct current starting motor is connected with the gear box 8 through an overspeed tripping device;
the output shaft of the gas turbine 7 is mechanically connected with a gear box 8;
the rotor of the main generator 9 is mechanically connected with the gear box 8;
when the rotating speed of the main gear of the gear box 8 is lower than or equal to the rated rotating speed of the direct current starting motor 6, the overspeed tripping device is positioned at an initial position to enable the output shaft of the direct current starting motor 6 to be mechanically connected with the gear box 8, when the direct current starting motor 6 is powered up to work, the output shaft of the direct current starting motor can drive the main gear of the gear box 8 to rotate, and the main gear of the gear box 8 can drive the output shaft of the gas turbine 7 and the rotor of the main generator 9 to rotate;
when the rotating speed of the main gear of the gear box 8 is higher than the rated rotating speed of the direct current starting motor 6, the overspeed tripping device acts to enable the output shaft of the direct current starting motor 6 to be separated from the mechanical connection with the gear box 8;
when the rotating speed of the output shaft of the gas turbine 7 is greater than the ignition rotating speed, the gas turbine 7 ignites; the ignition rotating speed is less than the rated rotating speed of the direct current starting motor.
Preferably, the gas turbine dc starting system further comprises a controller;
the starting power switch Q3 is a normally closed switch;
and when the rotating speed of the main gear of the gear box 8 is higher than the rated rotating speed of the direct current starting motor 6 and the overspeed tripping device acts to separate the direct current starting motor 6 from the mechanical connection with the gear box 8, the controller controls the starting power switch Q3 to be switched off.
Preferably, the gas turbine direct current starting system further comprises an internal charging switch Q2, an internal charger 3 and a permanent magnet generator 5;
the rotor of the permanent magnet generator 5 and the rotor of the main generator 9 rotate coaxially and are used for generating single-phase alternating current;
the internal charger 3 is used for converting the single-phase alternating current power supply sent by the permanent magnet generator 5 into direct current with the voltage corresponding to the storage battery pack 11, the input end of the internal charger is connected with the single-phase alternating current power supply sent by the permanent magnet generator 5, and the output end of the internal charger is connected with the bus 10 through an internal charging switch Q2.
Preferably, said permanent magnet generator 5 is mounted inside the main generator 9.
Preferably, the gas turbine dc starting system further comprises an automatic exciter 4;
the automatic exciter 4 is used for providing excitation voltage and excitation current for an excitation winding of the main generator 9, the power supply access end of the automatic exciter is connected with a single-phase alternating current power supply generated by the permanent magnet generator 5, and the output end of the automatic exciter is connected with the excitation winding of the main generator 9;
the controller controls the automatic exciter 4 to start working after the rotor speed of the main generator 9 reaches the rated speed of the main generator, and provides excitation voltage and excitation current for an excitation winding of the main generator 9, so that the output voltage of the main generator 9 reaches a set value and keeps stable; otherwise, the automatic exciter 4 is forbidden to work;
the rated rotating speed of the main generator is greater than that of the direct current starting motor.
Preferably, the gas turbine direct current starting system further comprises an external charger 2 and an external charging switch Q1;
the external charger 2 is characterized in that an external charging interface 1 of the external charger 2 is used for being connected with an external commercial power alternating-current power supply, and an output end of the external charger is connected with the bus 10 through the external charging switch Q1 and used for converting the commercial power alternating-current power supply into direct current with voltage matched with a storage battery pack;
the external charging switch Q1 is a normally open switch.
Preferably, the positive end of the battery pack 11 is connected to the bus bar 10 through a battery pack switch Q4.
Preferably, the battery pack switch Q4 is a normally closed switch.
According to the direct-current starting system of the gas turbine, when the gas turbine 7 needs to be started, the starting power switch Q3 is controlled to be switched on, and the direct-current starting motor 6 is electrified to work to drive the main gear of the gear box 8, the gas turbine 7 and the main generator 9 to rotate; after the rotating speed of the main gear in the gear box 8 is increased to the ignition rotating speed of the gas turbine 7, the gas turbine 7 is ignited to spray fuel, the direct current starting motor 6 and the gas turbine 7 simultaneously do work, and the rotating speed of the main gear in the gear box 8 is pushed to continuously increase; when the rotating speed of the main gear in the gear box 8 is higher than the rated rotating speed of the direct current starting motor 6, the overspeed tripping device acts to separate the direct current starting motor 6 from the mechanical connection with the gear box 8, and the direct current starting of the gas turbine is finished. This gas turbine direct current start-up system uses storage battery 11 as the starting power source who drives DC starter motor 6, realizes the start-up of gas turbine 7, does not need external commercial power alternating current power supply when gas turbine 7 starts, has expanded the use scene of gas turbine 7, has improved the start-up reliability of gas turbine 7 to shorten gas turbine 7 and started the preparation time, be applicable to the black start-up of direct current of gas turbine 7.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the present invention are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic configuration diagram of an embodiment of a DC start-up system of a gas turbine according to the present invention.
Description of reference numerals:
a Q4 battery pack switch; q3 starts the power switch; q2 internal charge switch; q1 external charging switch; 1 an external charging interface; 2 an external charger; 3 an internal charger; 4, an automatic exciter; 5 a permanent magnet generator; 6, starting the motor by direct current; 7 a gas turbine; 8 a gearbox; 9 a main generator; 10 bus bars; 11 a battery pack; 12 generator power outlet.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1, the gas turbine dc starting system includes a starting power switch Q3, a dc starting motor 6, a gas turbine 7, a gear box 8, a main generator 9, and a battery pack 11;
the positive end of the storage battery pack 11 is connected to the bus bar 10, and the negative end is grounded;
the power supply access positive end of the direct current starting motor 6 is connected with the bus 10 through a starting power switch Q3, and the output shaft of the direct current starting motor is connected with the gear box 8 through an overspeed tripping device;
the output shaft of the gas turbine 7 is mechanically connected with a gear box 8;
the rotor of the main generator 9 is mechanically connected with the gear box 8;
when the rotating speed of the main gear of the gear box 8 is lower than or equal to the rated rotating speed of the direct current starting motor 6, the overspeed tripping device is positioned at an initial position to enable the output shaft of the direct current starting motor 6 to be mechanically connected with the gear box 8, when the direct current starting motor 6 is powered up to work, the output shaft of the direct current starting motor can drive the main gear of the gear box 8 to rotate, and the main gear of the gear box 8 can drive the output shaft of the gas turbine 7 and the rotor of the main generator 9 to rotate;
when the rotating speed of the main gear of the gear box 8 is higher than the rated rotating speed of the direct current starting motor 6, the overspeed tripping device acts to enable the output shaft of the direct current starting motor 6 to be separated from the mechanical connection with the gear box 8;
when the rotating speed of the output shaft of the gas turbine 7 is greater than the ignition rotating speed, the gas turbine 7 ignites; the ignition rotating speed is less than the rated rotating speed of the direct current starting motor.
In the direct-current starting system of the gas turbine according to the first embodiment, the starting power switch Q3 is used for controlling the start and stop of the starting direct-current motor 6 circuit; the direct current starting motor 6 is used for providing power when the gas turbine 7 is started; the gas turbine 7 is a prime mover for driving a main generator 9; the gearbox 8 is used for transmitting the power of the gas turbine 9 to the main generator 9 and enabling the main generator 9 to obtain a designed rotating speed; the main generator 9 is used for converting the mechanical energy of the gas turbine 9 into electric energy and outputting rated voltage; the electrical power generated by the main generator 9 is output through a generator electrical outlet 12.
In the direct-current starting system of the gas turbine according to the first embodiment, when the gas turbine 7 needs to be started, the starting power switch Q3 is controlled to be switched on, and the direct-current starting motor 6 is powered up to work to drive the main gear of the gear box 8, the gas turbine 7 and the main generator 9 to rotate; after the rotating speed of the main gear in the gear box 8 is increased to the ignition rotating speed of the gas turbine 7, the gas turbine 7 is ignited, fuel is sprayed, the direct-current starting motor 6 and the gas turbine 7 do work simultaneously, and the rotating speed of the main gear in the gear box 8 is pushed to continuously increase; when the rotating speed of the main gear in the gear box 8 is higher than the rated rotating speed of the direct current starting motor 6, the overspeed tripping device acts to separate the direct current starting motor 6 from the mechanical connection with the gear box 8, and the direct current starting of the gas turbine is finished.
The gas turbine direct-current starting system according to the first embodiment uses the storage battery pack 11 as a starting power source for driving the direct-current starting motor 6, so that the gas turbine 7 is started, an external commercial power alternating-current power supply is not required when the gas turbine 7 is started, the use scene of the gas turbine 7 is expanded, the starting reliability of the gas turbine 7 is improved, the starting preparation time of the gas turbine 7 is shortened, and the gas turbine direct-current starting system is suitable for direct-current black starting of the gas turbine 7.
Example two
According to the first embodiment, the direct current starting system of the gas turbine further comprises a controller;
the starting power switch Q3 is a normally closed switch;
and when the rotating speed of the main gear of the gear box 8 is higher than the rated rotating speed of the direct current starting motor 6 and the overspeed tripping device acts to separate the direct current starting motor 6 from the mechanical connection with the gear box 8, the controller controls the starting power switch Q3 to be switched off.
EXAMPLE III
Based on the second embodiment, the gas turbine direct current starting system further comprises an internal charging switch Q2, an internal charger 3, and a Permanent Magnet Generator (PMG) 5;
the rotor of the Permanent Magnet Generator (PMG)5 and the rotor of the main generator 9 rotate coaxially and are used for generating single-phase alternating current;
the internal charger 3 is used for converting the single-phase alternating current power supply emitted by the Permanent Magnet Generator (PMG)5 into direct current with the voltage corresponding to the storage battery pack 11, the input end of the internal charger is connected with the single-phase alternating current power supply emitted by the Permanent Magnet Generator (PMG)5, and the output end of the internal charger is connected with the bus 10 through an internal charging switch Q2.
Preferably, said permanent magnet generator 5 is mounted inside the main generator 9.
In the dc starting system of the gas turbine according to the third embodiment, the internal charging switch Q2 is used for controlling the on/off of the internal charging circuit; the internal charger 3 converts a single-phase ac power supplied from a Permanent Magnet Generator (PMG)5 into a dc power having a voltage corresponding to the battery pack 11, and charges the battery pack 11.
Example four
The gas turbine direct current starting system based on the third embodiment further comprises an automatic exciter (AVR) 4;
the automatic exciter (AVR)4 is used for providing excitation voltage and excitation current for an excitation winding of the main generator 9, the power supply access end of the automatic exciter is connected with a single-phase alternating current power supply emitted by the Permanent Magnet Generator (PMG)5, and the output end of the automatic exciter is connected with the excitation winding of the main generator 9;
the controller controls the automatic exciter (AVR)4 to start working after the rotor speed of the main generator 9 reaches the rated speed of the main generator, and provides excitation voltage and excitation current for an excitation winding of the main generator 9, so that the output voltage of the main generator 9 reaches a set value and keeps stable; otherwise, the automatic exciter (AVR)4 is forbidden to work;
the rated rotating speed of the main generator is greater than that of the direct current starting motor.
In the dc start system of the gas turbine according to the fourth embodiment, a Permanent Magnet Generator (PMG)5 charges a battery pack 11 via an internal charger 3, and supplies power to an automatic exciter (AVR) 4. After the gas turbine 7 is successfully ignited, the gas turbine can automatically accelerate to the rated rotating speed of the gas turbine, at the moment, the gear box 8 drives the main generator 9 to reach the rated rotating speed of the main generator, the Permanent Magnet Generator (PMG)5 also reaches the rated rotating speed of the permanent magnet generator, a single-phase alternating current power supply is generated, and the single-phase alternating current power supply supplies power to the automatic exciter (AVR)4 to provide an excitation power supply. The automatic exciter 4 supplies an excitation voltage and an excitation current to an excitation winding of the main generator 9, so that the output voltage of the main generator 9 reaches a set value and is kept stable, and the electric power generated by the main generator 9 is output through a generator power outlet 10.
EXAMPLE five
Based on the third embodiment, the gas turbine direct current starting system further comprises an external charger 2 and an external charging switch Q1;
the external charger 2 is characterized in that an external charging interface 1 of the external charger 2 is used for being connected with an external commercial power alternating-current power supply, and an output end of the external charger is connected with the bus 10 through the external charging switch Q1 and used for converting the commercial power alternating-current power supply into direct current with voltage matched with a storage battery pack;
the external charging switch Q1 is a normally open switch.
In the dc starting system of the gas turbine according to the fifth embodiment, the external charging switch Q1 is used to control the on/off of the external charging circuit, and when it is necessary to charge the secondary battery 11, the external charging switch Q1 is turned on, and the internal charging switch Q2 and the starting power switch Q3 are turned off. If the storage battery pack 11 is used for the first time or is not used for a long time, the external charging interface 1 of the external charger 2 can be connected with a mains supply alternating current power supply, and the voltage of the mains supply is converted into direct current conforming to the storage battery pack 11 through the external charger 2 to charge the storage battery pack 11.
EXAMPLE six
According to the direct-current black-start system of the gas turbine of the first embodiment, the positive end of the storage battery pack 11 is connected with the bus bar 10 through a storage battery pack switch Q4.
Preferably, the battery switch Q4 is a normally closed switch.
In the dc black start system of the gas turbine according to the sixth embodiment, the battery pack switch Q4 is used to control the on/off of the output circuit of the battery pack 11, and the battery pack switch Q4 is turned on before the dc start system of the gas turbine is used.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A direct-current starting system of a gas turbine is characterized by comprising a starting power switch (Q3), a direct-current starting motor (6), the gas turbine (7), a gear box (8), a main generator (9) and a storage battery pack (11);
the positive end of the storage battery pack (11) is connected to the bus (10), and the negative end of the storage battery pack is grounded;
the power supply access positive end of the direct current starting motor (6) is connected with the bus (10) through a starting power switch (Q3), and the output shaft of the direct current starting motor is connected with a gear box (8) through an overspeed tripping device;
the output shaft of the gas turbine (7) is mechanically connected with a gear box (8);
the rotor of the main generator (9) is mechanically connected with the gear box (8);
when the rotating speed of a main gear of the gear box (8) is lower than or equal to the rated rotating speed of the direct current starting motor (6), the overspeed tripping device is positioned at an initial position to enable an output shaft of the direct current starting motor (6) to be mechanically connected with the gear box (8), when the direct current starting motor (6) is powered on to work, the output shaft of the direct current starting motor can drive a main gear of the gear box (8) to rotate, and the main gear of the gear box (8) can drive an output shaft of the gas turbine (7) and a rotor of a main generator (9) to rotate;
when the rotating speed of the main gear of the gear box (8) is higher than the rated rotating speed of the direct current starting motor (6), the overspeed tripping device acts to enable the output shaft of the direct current starting motor (6) to be separated from the mechanical connection with the gear box (8);
when the rotating speed of the output shaft of the gas turbine (7) is greater than the ignition rotating speed, the gas turbine (7) is ignited; the ignition rotating speed is less than the rated rotating speed of the direct current starting motor.
2. The gas turbine DC start-up system of claim 1,
the direct current starting system of the gas turbine also comprises a controller;
the starting power switch (Q3) is a normally closed switch;
when the rotating speed of the main gear of the gear box (8) is higher than the rated rotating speed of the direct current starting motor (6), the controller controls the starting power switch (Q3) to be switched off when the overspeed tripping device acts to separate the direct current starting motor (6) from the mechanical connection with the gear box (8).
3. The gas turbine DC start-up system of claim 2,
the direct-current starting system of the gas turbine further comprises an internal charging switch (Q2), an internal charger (3) and a permanent magnet generator (5);
the rotor of the permanent magnet generator (5) and the rotor of the main generator (9) rotate coaxially and are used for generating single-phase alternating current;
the internal charger (3) is used for converting a single-phase alternating current power supply emitted by the permanent magnet generator (5) into direct current with the voltage consistent with that of the storage battery pack (11), the input end of the internal charger is connected with the single-phase alternating current power supply emitted by the permanent magnet generator (5), and the output end of the internal charger is connected with the bus (10) through an internal charging switch (Q2).
4. Gas turbine DC start-up system according to claim 3,
the permanent magnet generator (5) is arranged in the main generator (9).
5. Gas turbine DC start-up system according to claim 3,
the direct-current starting system of the gas turbine also comprises an automatic exciter (4);
the automatic exciter (4) is used for providing excitation voltage and excitation current for an excitation winding of the main generator (9), the power supply access end of the automatic exciter is connected with a single-phase alternating current power supply emitted by the permanent magnet generator (5), and the output end of the automatic exciter is connected with the excitation winding of the main generator (9);
the controller controls the automatic exciter (4) to start working after the rotor speed of the main generator (9) reaches the rated speed of the main generator, and provides excitation voltage and excitation current for an excitation winding of the main generator (9), so that the output voltage of the main generator (9) reaches a set value and keeps stable; otherwise, the automatic exciter (4) is forbidden to work;
the rated rotating speed of the main generator is greater than that of the direct current starting motor.
6. The gas turbine DC start-up system of claim 1,
the direct-current starting system of the gas turbine also comprises an external charger (2) and an external charging switch (Q1);
the external charger (2) is characterized in that an external charging interface (1) of the external charger is used for being connected with an external mains supply alternating current power supply, and an output end of the external charger is connected with the bus (10) through the external charging switch (Q1) and used for converting the mains supply alternating current power supply into direct current with voltage conforming to that of the storage battery pack;
the external charging switch (Q1) is a normally open switch.
7. The gas turbine DC start-up system of claim 1,
the positive end of the storage battery pack (11) is connected with the bus (10) through a storage battery pack switch (Q4).
8. The gas turbine DC start-up system of claim 7,
the battery pack switch (Q4) is a normally closed switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210607247.4A CN115013165A (en) | 2022-05-31 | 2022-05-31 | Direct current starting system of gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210607247.4A CN115013165A (en) | 2022-05-31 | 2022-05-31 | Direct current starting system of gas turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115013165A true CN115013165A (en) | 2022-09-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210607247.4A Pending CN115013165A (en) | 2022-05-31 | 2022-05-31 | Direct current starting system of gas turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115013165A (en) |
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2022
- 2022-05-31 CN CN202210607247.4A patent/CN115013165A/en active Pending
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