CN113489276A - Generator transformation method - Google Patents
Generator transformation method Download PDFInfo
- Publication number
- CN113489276A CN113489276A CN202110801228.0A CN202110801228A CN113489276A CN 113489276 A CN113489276 A CN 113489276A CN 202110801228 A CN202110801228 A CN 202110801228A CN 113489276 A CN113489276 A CN 113489276A
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- China
- Prior art keywords
- excitation
- generator
- energy storage
- storage device
- exciter
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- 238000011426 transformation method Methods 0.000 title claims abstract description 11
- 230000005284 excitation Effects 0.000 claims abstract description 104
- 238000004146 energy storage Methods 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 13
- 238000004804 winding Methods 0.000 claims description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000009420 retrofitting Methods 0.000 claims 2
- 230000009466 transformation Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/26—Synchronous generators characterised by the arrangement of exciting windings
- H02K19/28—Synchronous generators characterised by the arrangement of exciting windings for self-excitation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/26—Synchronous generators characterised by the arrangement of exciting windings
-
- 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
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
-
- 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
-
- 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
- H02P2103/00—Controlling arrangements characterised by the type of generator
- H02P2103/20—Controlling arrangements characterised by the type of generator of the synchronous type
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a generator transformation method. The invention provides a generator transformation method which can realize the transformation of the generator alternating-current exciter excitation mode into the self-shunt excitation mode and simultaneously reserve the original main exciter aiming at two different alternating-current exciter excitation modes, namely a mode of adopting an excitation transformer as an auxiliary excitation regulator excitation power supply and a mode of adopting a permanent magnet machine as an auxiliary excitation regulator excitation power supply. The generator transformation method provided by the invention is suitable for the generator with an alternating current exciter excitation mode with a longer operation life, has a smaller transformation engineering amount, is beneficial to the old main exciter and has a certain practical value.
Description
Technical Field
The invention belongs to the technical field of design of thermal power plants, and particularly relates to a generator transformation method.
Background
The excitation modes of the generator can be divided into a static self-shunt excitation mode and an alternating current exciter excitation mode. The alternating current exciter excitation mode adjusts the generator voltage by adjusting the excitation voltage of the main exciter, but the slow excitation adjusting system is provided because the hysteresis time constant of the excitation winding of the alternating current exciter is large and the excitation adjusting response time is long. At present, a static self-shunt excitation system is mostly adopted by a unit, the structure is simple, the overhaul and the operation maintenance are simple, the excitation regulation response time is short, and the terminal voltage and reactive power regulation are quick. Therefore, some units adopting the ac exciter excitation mode with long operation life are gradually transformed into the self-shunt excitation mode.
Disclosure of Invention
The invention aims to provide a generator transformation method, which is characterized in that the excitation mode of an alternating current exciter of a generator is transformed into a self-shunt excitation mode, the original main exciter is reserved, and an energy storage device is connected, so that the operation flexibility of the generator is improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for improving the electric generator features that the connection between the original rectifying cabinet of main exciter and the exciting winding of electric generator is disconnected, the newly added energy accumulator is connected to the rectifying cabinet, the newly added main excitation regulator is connected to the exciting winding of electric generator, and the exciting power supply of main excitation regulator is taken from the secondary side of exciting transformer.
The invention is further improved in that the primary exciter is a synchronous generator, and is coaxially connected with the generator, and the working frequency is 100 Hz.
The invention is further improved in that if the original generator adopts the excitation transformer as the excitation power supply of the auxiliary excitation regulator, the excitation transformer is replaced to be the excitation transformer with larger capacity, and the excitation power supply of the main excitation regulator is taken from the secondary side of the excitation transformer.
The invention is further improved in that if the original generator adopts a permanent magnet machine as an excitation power supply of the auxiliary excitation regulator, an excitation transformer is newly added, the primary side of the excitation transformer is connected to the generator end, and the excitation power supply of the main excitation regulator is taken from the secondary side of the excitation transformer.
The invention is further improved in that the energy storage device is selected from a flywheel energy storage device, a lithium battery energy storage device, a super capacitor energy storage device, an electrolytic hydrogen production device or an electrode boiler.
The invention is further improved in that if the energy storage device adopts a flywheel energy storage device, a lithium battery energy storage device or a super capacitor energy storage device, the energy storage device can be switched to a power plant service system to supply power to the service system.
The invention is further improved in that the original main exciter is used for responding to a frequency modulation command issued by the power grid dispatching by the auxiliary unit.
The invention is further improved in that the original main exciter normally works under the working condition of 50% of rated capacity, when the unit responds to the frequency modulation command of adjusting power upwards, the original main exciter reduces load, and when the unit responds to the frequency modulation command of adjusting power downwards, the original main exciter increases load.
The invention has at least the following beneficial technical effects:
1. the method aims to transform the excitation mode of the alternating-current exciter of the generator into a self-shunt excitation mode, compared with the excitation mode of the alternating-current exciter, the self-shunt excitation mode has the advantages of simple structure, high reliability and high response speed, simultaneously reserves the original main exciter, has smaller transformation engineering quantity, and is beneficial to the stability of the running of a shafting system of the generator.
2. The method utilizes the original main exciter and the rectifier cabinet which are supposed to be removed in the self-shunt excitation mode to connect the original main exciter and the rectifier cabinet into the energy storage device, thereby not only improving the power generation capacity of the whole unit, but also improving the operation flexibility of the generator by changing the output of the original main exciter.
Compared with the prior art, the invention has the following remarkable advantages:
1. the method of the invention maintains the original main exciter while transforming the excitation mode of the alternating-current exciter into the self-shunt excitation mode, has small transformation on the original generator shafting system and ensures the stability of the operation of the original generator shafting system.
2. According to the method, the original main exciter rectifier cabinet is connected to the energy storage device, so that the power generation capacity of the whole unit is improved, the flexibility of the operation of the generator can be improved, and the generator can respond to a frequency modulation command by adjusting the output of the original main exciter.
Drawings
Fig. 1 is a schematic diagram of an ac exciter excitation scheme using an excitation transformer as a secondary excitation regulator excitation source.
Fig. 2 is a schematic diagram of an ac exciter excitation mode using a permanent magnet machine as an auxiliary excitation regulator excitation power supply.
Fig. 3 is a schematic diagram of the improved self-shunt excitation mode and the original main exciter connected to the energy storage device.
Fig. 4 is a schematic diagram of an electrical system according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the original generator adopts an alternating current exciter excitation mode in which an excitation variation is used as an excitation power supply of an auxiliary excitation regulator, and the method for modifying the generator provided by the invention is characterized in that the connection between a rectifier cabinet of the original main exciter and an excitation winding of the generator is disconnected, the rectifier cabinet is connected with a newly-added energy storage device, the newly-added main excitation regulator is connected with the excitation winding of the generator, the excitation power supply of the main excitation regulator is taken from the secondary side of the excitation variation, as shown in fig. 3, the original main exciter is a synchronous generator and is coaxially connected with the generator, the working frequency is 100Hz, the excitation variation with larger capacity is changed at the same time, and the excitation power supply of the main excitation regulator can be taken from the secondary side of the excitation variation.
As shown in fig. 2, the original generator adopts an alternating current exciter excitation mode in which a permanent magnet machine is used as an excitation power supply of an auxiliary excitation regulator, and the method for transforming the generator provided by the invention is characterized in that the connection between a rectifier cabinet of the original main exciter and an excitation winding of the generator is disconnected, the rectifier cabinet is connected with a newly-added energy storage device, the newly-added main excitation regulator is connected with the excitation winding of the generator, and the excitation power supply of the main excitation regulator is taken from the secondary side of the excitation transformer, as shown in fig. 3, the original main exciter is a synchronous generator and is coaxially connected with the generator, the working frequency is 100Hz, because the original generator adopts the permanent magnet machine as the excitation power supply of the auxiliary excitation regulator, the excitation transformer is newly added, the primary side of the excitation transformer is connected to the generator end, and the excitation power supply of the main excitation regulator is taken from the secondary side of the excitation transformer.
In the two transformation modes, the energy storage mode of the energy storage device connected to the original main exciter can be selected from a flywheel energy storage device, a lithium battery energy storage device, a super capacitor energy storage device, an electrolytic hydrogen production device or an electrode boiler, but is not limited to the above energy storage modes.
If the energy storage device adopts a flywheel energy storage device, a lithium battery energy storage device or a super capacitor energy storage device, the energy storage device can be switched to a power plant service system to supply power to the service system.
After transformation, the main exciter can be used for responding to a frequency modulation command issued by power grid dispatching by the auxiliary unit, and the mode method for responding to the frequency modulation command issued by the power grid dispatching comprises the steps that the main exciter normally works under the working condition of 50% of rated capacity, when the unit responds to the frequency modulation command for adjusting power upwards, the load of the main exciter is reduced, and when the unit responds to the frequency modulation command for adjusting power downwards, the load of the main exciter is increased.
Example 1
As shown in fig. 4. The embodiment is a 200MW unit of a power plant, a main exciter of the power plant is connected to a 5MW lithium iron phosphate energy storage facility through a rectifier cabinet, and the energy storage facility is connected to a low-voltage power plant power utilization system through an inverter cabinet. When the energy storage battery works normally, the main exciter and the generator rotate coaxially, and work under the working condition of 50% load to charge the energy storage battery. When the unit responds to a frequency modulation command which is issued by dispatching and increases output power, the main exciter stops charging, and meanwhile, the lithium iron phosphate battery supplies power to low-voltage station service through the inverter cabinet. And when the unit responds to the frequency modulation command which is issued by the dispatching and used for reducing the output, the load of the main exciter is increased. The energy storage facility can be used as a security power supply for service power.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A method for improving a generator is characterized in that the method is characterized in that the original main exciter rectifier cabinet is disconnected from a generator exciting winding, the rectifier cabinet is connected with a newly-added energy storage device, a newly-added main excitation regulator is connected with the generator exciting winding, and an excitation power supply of the main excitation regulator is taken from an excitation transformer secondary side.
2. A method of retrofitting a generator as claimed in claim 1 wherein the primary exciter is a synchronous generator connected coaxially to the generator and operating at 100 Hz.
3. A generator transformation method as claimed in claim 1, characterized in that if the original generator uses an excitation transformer as the excitation power supply of the auxiliary excitation regulator, the excitation transformer is replaced to have a larger capacity excitation transformer, and the excitation power supply of the main excitation regulator is taken from the secondary side of the excitation transformer.
4. A generator transformation method as claimed in claim 1, wherein if the original generator uses a permanent magnet machine as the excitation power supply of the secondary excitation regulator, the excitation transformer is newly added, the primary side of the excitation transformer is connected to the generator end, and the excitation power supply of the primary excitation regulator is taken from the secondary side of the excitation transformer.
5. The method of claim 1, wherein the energy storage device is selected from the group consisting of a flywheel energy storage device, a lithium battery energy storage device, a super capacitor energy storage device, an electrolytic hydrogen production device, and an electrode boiler.
6. The generator transformation method according to claim 5, wherein if the energy storage device is a flywheel energy storage device, a lithium battery energy storage device or a super capacitor energy storage device, the energy storage device can be switched to a power plant service system to supply power to the service system.
7. The generator transformation method according to claim 1, wherein the primary exciter is used for assisting the generator set to respond to a frequency modulation command issued by a power grid schedule.
8. A method of retrofitting a generator as claimed in claim 1 wherein the primary exciter is normally operated at 50% rated capacity, the primary exciter is de-loaded when the stack responds to a frequency modulation command to adjust power up and the primary exciter is de-loaded when the stack responds to a frequency modulation command to adjust power down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110801228.0A CN113489276A (en) | 2021-07-15 | 2021-07-15 | Generator transformation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110801228.0A CN113489276A (en) | 2021-07-15 | 2021-07-15 | Generator transformation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113489276A true CN113489276A (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110801228.0A Pending CN113489276A (en) | 2021-07-15 | 2021-07-15 | Generator transformation method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59156199A (en) * | 1983-02-25 | 1984-09-05 | Fuji Electric Co Ltd | Excitation regulator of ac generator |
| CN101018036A (en) * | 2006-12-29 | 2007-08-15 | 山东齐鲁电机制造有限公司 | Dynamotor brushless excitation adjuster with the protection device |
| CN103326650A (en) * | 2013-05-15 | 2013-09-25 | 华中科技大学 | Self-shunt excitation system of electric generator |
| CN108199389A (en) * | 2017-12-11 | 2018-06-22 | 囯网河北省电力有限公司电力科学研究院 | A kind of method and device for improving the response of thermal power generation system primary frequency modulation |
| CN209030131U (en) * | 2018-10-25 | 2019-06-25 | 山东省环能设计院股份有限公司 | A kind of generator excitation power supply system |
-
2021
- 2021-07-15 CN CN202110801228.0A patent/CN113489276A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59156199A (en) * | 1983-02-25 | 1984-09-05 | Fuji Electric Co Ltd | Excitation regulator of ac generator |
| CN101018036A (en) * | 2006-12-29 | 2007-08-15 | 山东齐鲁电机制造有限公司 | Dynamotor brushless excitation adjuster with the protection device |
| CN103326650A (en) * | 2013-05-15 | 2013-09-25 | 华中科技大学 | Self-shunt excitation system of electric generator |
| CN108199389A (en) * | 2017-12-11 | 2018-06-22 | 囯网河北省电力有限公司电力科学研究院 | A kind of method and device for improving the response of thermal power generation system primary frequency modulation |
| CN209030131U (en) * | 2018-10-25 | 2019-06-25 | 山东省环能设计院股份有限公司 | A kind of generator excitation power supply system |
Non-Patent Citations (1)
| Title |
|---|
| 贺长宏: ""安康水电站励磁系统及交流励磁机改发电机的可行性研究"", 《工程科技Ⅱ辑》 * |
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Application publication date: 20211008 |
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