CN112910342A - Excitation mode of gas turbine - Google Patents
Excitation mode of gas turbine Download PDFInfo
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- CN112910342A CN112910342A CN202011572184.0A CN202011572184A CN112910342A CN 112910342 A CN112910342 A CN 112910342A CN 202011572184 A CN202011572184 A CN 202011572184A CN 112910342 A CN112910342 A CN 112910342A
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- 230000005284 excitation Effects 0.000 title claims abstract description 168
- 238000002485 combustion reaction Methods 0.000 claims abstract description 16
- 230000009466 transformation Effects 0.000 claims description 9
- 230000004048 modification Effects 0.000 claims description 8
- 238000012986 modification Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 30
- 238000010248 power generation Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
-
- 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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
-
- 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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/006—Means for protecting the generator by using control
-
- 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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/38—Self-excitation by current derived from rectification of both output voltage and output current of generator
-
- 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
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/25—Special adaptation of control arrangements for generators for combustion engines
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses an excitation mode of a combustion engine, wherein a low-voltage excitation transformer TG of the combustion engine is replaced by a low-voltage excitation transformer TG1, and the low-voltage excitation transformer TG1 is a primary side double-tap excitation transformer; a breaker Z1 is added at the secondary output end of the high-voltage excitation transformer TL and is connected to a primary tap 1 of a low-voltage excitation transformer TG through a breaker Z1, and the voltage of the primary tap 1 is 300V; the voltage of the low-voltage excitation transformer TG1 is transformed to provide a self-shunt excitation power supply; in addition, one path of auxiliary power is introduced as a separately excited power supply, and is connected to a primary side tap 2 of a low-voltage excitation transformer TG1 through a circuit breaker T1, the voltage of the primary side tap 2 is 380V, and the separately excited power supply is provided after the voltage of the primary side tap is transformed by a low-voltage excitation transformer TG 1. The invention has the advantages that the excitation mode of 'self-shunt excitation' for rapidly switching auxiliary power 'independent excitation' is provided, when the self-shunt excitation system of the gas turbine set fails, the self-shunt excitation system can be switched to the auxiliary power independent excitation mode in a shorter time, and the running reliability of the unit is effectively improved.
Description
Technical Field
The invention relates to the technical field of gas power generation, in particular to an excitation mode of a gas turbine.
Background
Gas-fired power generation is a process of generating electricity using natural gas or other combustible gases. The gas turbine is a rotary machine for converting heat energy into mechanical work, and comprises a gas compressor, a device for heating working media, a turbine, a control system, an auxiliary device and the like, wherein air is generally used as the working media.
Since the gas turbine ascends the power generation industrial stage in the 50 th century, the power generation efficiency and the heat efficiency of the gas turbine are greatly improved, particularly, a gas-steam combined cycle unit becomes mature day by day, the single-machine power of the gas turbine exceeds 334MW, the heat efficiency reaches 35% -41.92%, the single-machine power of the combined cycle unit reaches 489.3MW, and the heat efficiency exceeds 60%, so that the technical support is provided for the improvement of the position of gas power generation in an electric power system.
The excitation system of the gas power generation is used as an important component of the generator and has the functions of maintaining the voltage at the generator end stable, reasonably distributing reactive power and improving the stability of a power system. At present, the excitation system of the 9E combustion engine is widely applied to a self-shunt excitation mode. In general, in a self-shunt excitation mode, the voltage at the generator end is transformed by a high-voltage excitation transformer and then provides an excitation power supply for an excitation system. The technology is mature and reliable. However, once the generator-end high-voltage excitation transformer fails, the maintenance usually needs a long period of time, and the operation of the generator set is directly influenced. And the 9E combustion engine is usually used as a peak shaving unit, and the peak shaving of the power grid is carried out through the starting and stopping unit, so that the frequent starting and stopping has great influence on the service life of related electrical equipment.
Disclosure of Invention
The invention aims to provide an excitation mode of a gas turbine, which has the advantages that an excitation mode of 'self-shunt excitation' for rapidly switching auxiliary power 'independent excitation' is provided, when a self-shunt excitation system of the gas turbine group fails, the self-shunt excitation system can be switched to the auxiliary power independent excitation mode in a short time, the reliability of unit operation is effectively improved, and the problem that the operation of the unit is directly influenced because high-voltage excitation at the generator end fails and the maintenance generally needs a long time period is solved.
In order to achieve the purpose, the invention provides the following technical scheme: a low-voltage exciting transformer TG of the gas turbine is replaced by a low-voltage exciting transformer TG1, and the low-voltage exciting transformer TG1 is a primary side double-tap exciting transformer; a breaker Z1 is added at the secondary output end of the high-voltage excitation transformer TL and is connected to a primary tap 1 of a low-voltage excitation transformer TG through a breaker Z1, and the voltage of the primary tap 1 is 300V; the voltage of the low-voltage excitation transformer TG1 is transformed to provide a self-shunt excitation power supply; in addition, one path of auxiliary power is introduced as a separately excited power supply, and is connected to a primary side tap 2 of a low-voltage excitation transformer TG1 through a circuit breaker T1, the voltage of the primary side tap 2 is 380V, and the separately excited power supply is provided after the voltage of the primary side tap is transformed by a low-voltage excitation transformer TG 1.
As a further scheme of the invention, the self-parallel excitation operation mode and the self-excitation operation mode of the combustion engine are as follows:
when the gas turbine normally operates, a self-shunt excitation mode is adopted, the circuit breaker Z1 is switched on, the circuit breaker T1 is switched off, and the unit operates in an excitation mode; when the high-voltage excitation transformer TL of the gas turbine fails and the gas turbine cannot provide excitation power in a self-shunt excitation mode, the connection between the excitation transformer and the gas turbine can be quickly disconnected, the circuit breaker Z1 is disconnected, and the circuit breaker T1 is closed; the excitation power supply is provided by the auxiliary power supply, and the unit can be quickly recovered for standby.
As a further scheme of the invention, after the combustion engine is switched to a service power independent excitation mode, the parameters of the FWLZ-E/1DW excitation regulator are modified as follows:
the zero-rise pressure modification parameter is that an automatic excitation-starting reset value PR9500 is changed into 0, the terminal voltage FO at the excitation-starting ending moment is changed from 250 to 0, a manual channel reset value PM is changed from 1500 to 0, and a separate excitation mode TL is changed from 0 to 1, namely, the normal excitation-starting voltage-building modification parameter is that the automatic excitation-starting reset value PR is changed from 0 to 9500, the terminal voltage FO at the excitation-starting ending moment is changed from 0 to 250, the manual channel reset value PM is changed from 0 to 1500, and the separate excitation mode TL is changed from 0 to 1.
As a further scheme of the invention, the parameters of the low-voltage excitation transformer TG are as follows: 20kVA, transformation ratio 300/115V, grafting Y/d 11; in order to realize the quick switching between self-shunt excitation and separate excitation, a low-voltage excitation transformer TG1 is replaced by primary side double-tap excitation, the transformation ratio is 380V/300V/115V, the capacity is 27KVA, the connection method is Y/d11, and the short-circuit impedance is 5% < DUk < 7%.
As a further scheme of the invention, under the condition of strong excitation of the excitation regulator and according to the capacity transformation ratio of the high-voltage excitation transformer, the circuit breaker Z1 and the circuit breaker T1 both adopt EZD100E 125A 3P molded case circuit breakers.
Compared with the prior art, the invention has the following beneficial effects: when the gas turbine normally operates to generate electricity, a self-shunt excitation mode is adopted, the circuit breaker Z1 is switched on, the circuit breaker T1 is switched off, and the unit operates in an excitation mode; when the high-voltage excitation transformer TL of the gas turbine fails and the gas turbine cannot provide excitation power in a self-shunt excitation mode, the connection between the excitation transformer and the gas turbine can be quickly disconnected, the circuit breaker Z1 is disconnected, and the circuit breaker T1 is closed; and the excitation power supply is provided by auxiliary power for continuous use.
The excitation mode of 'self-shunt excitation' for rapidly switching auxiliary power 'separate excitation' is provided, when a self-shunt excitation system of a gas turbine set fails, the self-shunt excitation system can be switched to the auxiliary power separate excitation mode in a short time, and the running reliability of the set is effectively improved.
Drawings
FIG. 1 is a schematic diagram of an excitation system of the present invention prior to modification;
fig. 2 is a rectification schematic diagram after the excitation system is modified.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, an embodiment before modification: take the south mountain thermal power plant # 10 gas turbine generator set as an example: the #10 combustion engine adopts a TA30-131 type generator produced by GE, a generator excitation system adopts a two-machine brushless excitation mode, and an excitation regulator is provided by Tianjin Rui Xin Chuang and electric company Limited and has the model of FWLZ-E/1 DW. As shown in fig. 1, the original excitation system mainly comprises an exciter LQ, an excitation regulator, a high-voltage excitation transformer TL, a low-voltage excitation transformer TG, and an excitation current measurement circuit.
The exciter LQ shown is a three-phase ac brushless exciter, in which the field is stationary, the armature rotates, and the three-phase ac output from the armature is rectified into dc by a three-phase rotating rectifier that rotates coaxially, and sent to the field winding of the generator to provide the generator excitation.
The excitation regulator shown is of a dual-channel design and is used for standby. Each channel is set to a voltage regulation mode AVR and a current regulation mode FCR. The magnetic regulator is switched excitation, and the main purpose is to accurately regulate and control the terminal voltage and reactive power of the synchronous generator, in order to meet the requirement, the excitation voltage must make a quick response to the change of the working condition, and the excitation voltage is calculated by a PID control rule and then sends out a trigger angle of a control quantity IGBT, and the trigger angle and the intelligent power module IPM send out a trigger pulse to control the excitation current of the generator according to the trigger angle.
The high-voltage excitation transformer TL is connected with the input end of the high-voltage excitation transformer TL and is used as generator terminal voltage, and the secondary side of the high-voltage excitation transformer TL is connected to the primary side of the low-voltage excitation transformer TG and is used for providing anode power in a self-shunt excitation mode.
The excitation current measuring loop is shown, the excitation current output by the excitation regulator is measured through a current sensor BA1, and BA1 converts the excitation current from a strong signal to a weak signal If1 and transmits the weak signal to the channel 1 and the channel 2 of the excitation regulator.
The excitation system has a fault in the high-voltage excitation transformer at the generator end, generally requires a long construction period for maintenance, and directly influences the operation of a unit. And the combustion engine is usually used as a peak shaving unit, and the peak shaving of the power grid is carried out through the starting and stopping unit, so that the frequent starting and stopping has great influence on the service life of related electrical equipment.
Example 2
Referring to fig. 2, an embodiment of the present invention: a low-voltage exciting transformer TG of the gas turbine is replaced by a low-voltage exciting transformer TG1, and the low-voltage exciting transformer TG1 is a primary side double-tap exciting transformer; a breaker Z1 is added at the secondary output end of the high-voltage excitation transformer TL and is connected to a primary tap 1 of a low-voltage excitation transformer TG through a breaker Z1, and the voltage of the primary tap 1 is 300V; the voltage of the low-voltage excitation transformer TG1 is transformed to provide a self-shunt excitation power supply; in addition, one path of auxiliary power is introduced as a separately excited power supply, and is connected to a primary side tap 2 of a low-voltage excitation transformer TG1 through a circuit breaker T1, the voltage of the primary side tap 2 is 380V, and the separately excited power supply is provided after the voltage of the primary side tap is transformed by a low-voltage excitation transformer TG 1. The original excitation regulator portion of example 1 was not modified. The parameters of the low-voltage exciting transformer TG are as follows: 20kVA, transformation ratio 300/115V, grafting Y/d 11; in order to realize the quick switching between self-shunt excitation and separate excitation, a low-voltage excitation transformer TG1 is replaced by primary side double-tap excitation, the transformation ratio is 380V/300V/115V, the capacity is 27KVA, the connection method is Y/d11, and the short-circuit impedance is 5% < DUk < 7%. According to the capacity transformation ratio of the high-voltage excitation transformer and the strong excitation condition of the excitation regulator, the circuit breaker Z1 and the circuit breaker T1 both adopt EZD100E 125A 3P molded case circuit breakers.
When the gas turbine normally operates, a self-shunt excitation mode is adopted, the circuit breaker Z1 is switched on, the circuit breaker T1 is switched off, and the unit operates in an excitation mode; when the high-voltage excitation transformer TL of the gas turbine fails and the gas turbine cannot provide excitation power in a self-shunt excitation mode, the connection between the excitation transformer and the gas turbine can be quickly disconnected, the circuit breaker Z1 is disconnected, and the circuit breaker T1 is closed; the excitation power supply is provided by the auxiliary power supply, and the unit can be quickly recovered for standby.
After the combustion engine is switched to an auxiliary power independent excitation mode, parameters of the FWLZ-E/1DW excitation regulator need to be modified as follows: the zero-rise pressure modification parameter is that an automatic excitation-starting reset value PR9500 is changed into 0, the terminal voltage FO at the excitation-starting ending moment is changed from 250 to 0, a manual channel reset value PM is changed from 1500 to 0, and a separate excitation mode TL is changed from 0 to 1, namely, the normal excitation-starting voltage-building modification parameter is that the automatic excitation-starting reset value PR is changed from 0 to 9500, the terminal voltage FO at the excitation-starting ending moment is changed from 0 to 250, the manual channel reset value PM is changed from 0 to 1500, and the separate excitation mode TL is changed from 0 to 1.
The excitation mode of 'self-shunt excitation' for rapidly switching auxiliary power 'separate excitation' is provided, when a self-shunt excitation system of a gas turbine set fails, the self-shunt excitation system can be switched to the auxiliary power separate excitation mode in a short time, and the running reliability of the set is effectively improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. An excitation system for a combustion engine, characterized in that: replacing a low-voltage excitation transformer TG of the gas turbine with a low-voltage excitation transformer TG1, wherein the low-voltage excitation transformer TG1 is a primary side double-tap excitation transformer; a breaker Z1 is added at the secondary output end of the high-voltage excitation transformer TL and is connected to a primary tap 1 of a low-voltage excitation transformer TG through a breaker Z1, and the voltage of the primary tap 1 is 300V; the voltage of the low-voltage excitation transformer TG1 is transformed to provide a self-shunt excitation power supply; in addition, one path of auxiliary power is introduced as a separately excited power supply, and is connected to a primary side tap 2 of a low-voltage excitation transformer TG1 through a circuit breaker T1, the voltage of the primary side tap 2 is 380V, and the separately excited power supply is provided after the voltage of the primary side tap is transformed by a low-voltage excitation transformer TG 1.
2. An excitation system for a combustion engine according to claim 1, wherein: the self-shunt excitation operation mode and the self-excitation operation mode of the combustion engine are as follows:
when the gas turbine normally operates, a self-shunt excitation mode is adopted, the circuit breaker Z1 is switched on, the circuit breaker T1 is switched off, and the unit operates in an excitation mode; when the high-voltage excitation transformer TL of the gas turbine fails and the gas turbine cannot provide excitation power in a self-shunt excitation mode, the connection between the excitation transformer and the gas turbine can be quickly disconnected, the circuit breaker Z1 is disconnected, and the circuit breaker T1 is closed; the excitation power supply is provided by the auxiliary power supply, and the unit can be quickly recovered for standby.
3. An excitation system for a combustion engine according to claim 1, wherein: after the combustion engine is switched to an auxiliary power independent excitation mode, parameters of the FWLZ-E/1DW excitation regulator need to be modified as follows:
the zero-rise pressure modification parameter is that an automatic excitation-starting reset value PR9500 is changed into 0, the terminal voltage FO at the excitation-starting ending moment is changed from 250 to 0, a manual channel reset value PM is changed from 1500 to 0, and a separate excitation mode TL is changed from 0 to 1, namely, the normal excitation-starting voltage-building modification parameter is that the automatic excitation-starting reset value PR is changed from 0 to 9500, the terminal voltage FO at the excitation-starting ending moment is changed from 0 to 250, the manual channel reset value PM is changed from 0 to 1500, and the separate excitation mode TL is changed from 0 to 1.
4. An excitation system for a combustion engine according to claim 1, wherein: the parameters of the low-voltage exciting transformer TG are as follows: 20kVA, transformation ratio 300/115V, grafting Y/d 11; in order to realize the quick switching between self-shunt excitation and separate excitation, a low-voltage excitation transformer TG1 is replaced by primary side double-tap excitation, the transformation ratio is 380V/300V/115V, the capacity is 27KVA, the connection method is Y/d11, and the short-circuit impedance is 5% < DUk < 7%.
5. An excitation system for a combustion engine according to claim 1, wherein: according to the capacity transformation ratio of the high-voltage excitation transformer and the strong excitation condition of the excitation regulator, the circuit breaker Z1 and the circuit breaker T1 both adopt EZD100E 125A 3P molded case circuit breakers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011572184.0A CN112910342A (en) | 2020-12-27 | 2020-12-27 | Excitation mode of gas turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011572184.0A CN112910342A (en) | 2020-12-27 | 2020-12-27 | Excitation mode of gas turbine |
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| CN112910342A true CN112910342A (en) | 2021-06-04 |
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| CN202011572184.0A Pending CN112910342A (en) | 2020-12-27 | 2020-12-27 | Excitation mode of gas turbine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10108496A (en) * | 1996-09-27 | 1998-04-24 | Meidensha Corp | Excitation controller of ac generator |
| CN1558550A (en) * | 2004-01-14 | 2004-12-29 | 华中科技大学 | A self shunt excitation AC excitation electricity generating device |
| JP2007202286A (en) * | 2006-01-26 | 2007-08-09 | Toshiba Corp | Excitation device of synchronous machine |
| CN102843085A (en) * | 2012-09-27 | 2012-12-26 | 武汉华大电力自动技术有限责任公司 | Double-feed fan excitation control device and control method thereof |
| JP2014057490A (en) * | 2012-09-14 | 2014-03-27 | Mitsubishi Electric Corp | Excited power supply device |
| CN206060608U (en) * | 2016-10-01 | 2017-03-29 | 广东惠州天然气发电有限公司 | A kind of power control structure of gas turbine energized circuit |
-
2020
- 2020-12-27 CN CN202011572184.0A patent/CN112910342A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10108496A (en) * | 1996-09-27 | 1998-04-24 | Meidensha Corp | Excitation controller of ac generator |
| CN1558550A (en) * | 2004-01-14 | 2004-12-29 | 华中科技大学 | A self shunt excitation AC excitation electricity generating device |
| JP2007202286A (en) * | 2006-01-26 | 2007-08-09 | Toshiba Corp | Excitation device of synchronous machine |
| JP2014057490A (en) * | 2012-09-14 | 2014-03-27 | Mitsubishi Electric Corp | Excited power supply device |
| CN102843085A (en) * | 2012-09-27 | 2012-12-26 | 武汉华大电力自动技术有限责任公司 | Double-feed fan excitation control device and control method thereof |
| CN206060608U (en) * | 2016-10-01 | 2017-03-29 | 广东惠州天然气发电有限公司 | A kind of power control structure of gas turbine energized circuit |
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Application publication date: 20210604 |
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